New WIKA MH-3 Pressure Transmitter for Mobile Working Machines

Determining problems and errors in the field just got easier with the new WIKA MH-3 pressure transmitter for mobile working machines. WIKA Instrument, LP captures the latest pressure sensor technology with the addition of the diagnostic function in the new MH-3 pressure transmitter.

The MH-3 builds on the features of the MH-2, introducing signal clamping in addition to the sought after diagnostic function. These features will keep machines running longer by reducing downtime and maintenance costs.

Applications

• Hydraulics
• Load monitoring
• Loads moment limitation
• Hydraulic drive control
• Fluids in mobile working machines

"Mobile machine manufacturers wanted a solution to allow field technicians the ability to diagnose problems quickly in order to get machines back into service. They also wanted a solution to the high warranty claims, in addition to solving the age old practice of replacing components until the failed component was found," WIKA's Senior Group Manager Business Development Jeff Placek stated.

The new MH-3 pressure transmitter fulfills these requests and much more. The MH-3 pressure transmitter was created for mobile working machines that operate under extreme conditions in harsh environments. Ideally suited for load monitoring and indication, as well as hydraulic drive control, the MH-3 can also be customized to customer specific applications.

Diagnostics: Allows field repair technicians the ability to quickly identify problems and get machines back into service, reducing the high costs associated with downtime and warranty claims.

Signal clamping: Eliminates out of range signals from the transmitter which could cause the machine to act erratically or completely shut down, resulting in unnecessary service calls.

For more information about the MH-3 and how WIKA can be a part of your business, visit http://www.forberg.com/contact_us.php .

About WIKA Instrument, LP

For almost 70 years, WIKA has continuously advanced pressure gauge, pressure transmitter and temperature measurement instrumentation. We have used our experience to develop a broad selection of stock and custom instrumentation solutions and professional services to support plant safety, productivity and profitability. A global leader in lean manufacturing, WIKA annually produces more than 43 million pressure gauges, diaphragm seals, pressure transmitters and thermometers worldwide for a variety of industries.

If you would like more information about the WIKA MH-3 Pressure Transmitter or any of the other WIKA Products please contact Forberg Scientific customer service.
Email: mechanicalsales@forberg.com
Phone: 855-288-5330

FLOMEC® 02 Scaled Pulse Meter Economy Series Flowmeter

07/29/2015 -- Great Plains Industries, Inc. (GPI) is excited to announce that its new FLOMEC® 02 Scaled Pulse Meter is now available for immediate shipment. The specification sheet and owner's manual are available at below.

"GPI is adding a scaled pulse output option to its Economy Series flowmeter line based on market needs and GPI's culture of innovation," says Kevin Symens, North American Sales Manager, Meters Division.

Compact and lightweight in construction — important benefits when used in mobile installations or within confined spaces — the new FLOMEC branded 02N and 02A will carry the same specifications as the GPI 01N and 01A. Additionally, it will include a pair of output wires to provide a single pulse for every gallon or liter measured.

The 02 meter products offer versatility to a wider variety of applications including irrigation, building automation (chillers), programmable logic controller (batch control), wireless communications, data logger, OEM skids and more. The 01 meter products remain available for applications requiring a display with no output.

"We're excited to offer our customers a differentiated new product," said Symens. "The FLOMEC 02 Scaled Pulse Meter is another prime example of how we continually bring added-value to our customers."

The 02A will not carry the FM Global approval, but all other features will remain the same.

About Great Plains Industries

Founded in 1968 and privately held, Great Plains Industries, Inc. manufactures quality fuel transfer pumps, fuel meters, flowmeters and industrial instrumentation for global fluid transfer and liquid flowmeter markets. Headquartered in Wichita, Kan., the company is home to the GPI®, FLOMEC® and GPRO® brands that serve industrial, commercial and retail customers in diverse applications: fuel, agriculture, chemicals, manufacturing, construction, mining, oil and gas, and more.

For more information on the new Flomec 02 Scaled pulse meter click the links below:

Download Spec Sheet

Download Owner's Manual

If you would like pricing and availability please contact Forberg Scientific customer service.

P: 855-288-5330

E: processsales@forberg.com

W: www.forberg.com

When Should You Use Diaphragm Seals?

By: Instrument Guru, December 2, 2014
 
Pressure gauges are often used in extreme conditions in industrial processes, and some gauges are specifically designed for use in these difficult process environments. These tough process gauges typically include features such as hardened housings, liquid-filled casings, and a stress-reducing Bourdon tube design, and they are often equipped with a diaphragm seal to prevent contact between the hot or corrosive media and the gauge itself. A diaphragm seal protects pressure gauges from dangerously hot, viscous, or corrosive media and dramatically extends the lifetime of the instrument.
 

Understanding diaphragm seals

 
A diaphragm seal is connected to a gauge as either a direct connection or by way of a capillary. An elastomer or flexible metal diaphragm keeps the process media from contacting the workings of the gauge. The chamber between the diaphragm and the gauge is filled with a fluid that accurately transfers the pressure of the process media by hydraulic means. Any change in process media pressure is transmitted through the flexible diaphragm into the system fill fluid, which then connects to the Bourdon tube of the gauge.
 
Diaphragm seals can be easily mounted onto gauges using threaded, flanged, in line, sanitary, or other types of connections.
 
In most cases, diaphragm seal bodies and the diaphragms themselves are stainless steel, but instrument industry leaders like WIKA also produce diaphragm seals from other materials including carbon steel and Hastelloy® C-276 for specific applications. WIKA’s diaphragm seals are designed to operate in pressure applications from 10″ Hg to 20,000 psi and at media temperatures between -130°F and +752°F.
 
Diaphragm seals are also installed on pressure transmitters and switches exposed to extreme conditions.
 

When to use a diaphragm seal

 

• Protective diaphragm seals are typically used in applications where direct contact with the process media will degrade the instrument. Diaphragm seals should be considered under conditions including:
• High-temperature media – A diaphragm can be designed to include a cooling element; for example, a diaphragm seal with an 8″ cooling tower can tolerate temperatures up to 750°F.
• Corrosive media – WIKA can provide diaphragm seals made of a variety of custom alloys, including PTFE, gold and silver, or carbon steel. WIKA’s Metal Bonded Diaphragms are designed for processes requiring Hastelloy®, Monel® and Tantalum flush diaphragms.
• Viscous or crystallizing media – Using pressure seals reduces the number of connections in a process, minimizing internal cavities where clogs typically form.
• Media with suspended solids – Diaphragm seals minimize clogging in process applications such as pharmaceutical, pulp and paper, food and beverage, chemical, and waste water.
• When overpressure protection is required – WIKA has designed a diaphragm seal with a continuous-duty contoured diaphragm bed for robust overpressure protection.
• When sanitary cleanliness is required – WIKA’s patented InLine Seal™ makes sure that your process system does not develop “dead spaces” that encourage bacterial growth.
• Highly toxic or dangerous media – An all-welded process gauge and diaphragm seal system offers extra protection to minimize the chance of any toxic media escaping.

Top quality WIKA diaphragm seals specifically designed around your processes can dramatically extend the lifetime of your pressure measurement instrumentation and lead to significant cost savings. Contact us to learn more about how a small investment in the right diaphragm seals pays off over the long run.

Forberg Scientific, Inc.
P: 855-288-5330
E: mechanicalsales@forberg.com
www.forberg.com

Parker Autoclave 1-1/2" Fittings & Tubing - Up to 15,000 psi

High Flow and High Pressure don’t always mix…

If you’ve ever worked with high pressure fluids you know that with high pressure thick-walled tubing, the increased wall thickness takes away flow area (tubing maintains the O.D.).

So when flow is critical to your process as with Nitrogen Injection, it isn’t unusual to see dual (or even triple) tubing runs to meet pressure and flow requirements. Not any more…

Parker Autoclave Engineers continues our reputation of excellence as we design the hardware your application requires that will increase production while saving you money. We are happy to announce the availability of our NEW Medium Pressure 1½” Fittings and Tubing that are designed for working pressures up to 15,000 psi (1,034 bar).

With one run using this size tubing (flow area = 0.69 in2), you have nearly the same flow area as two 1” (combined area = 0.74 in2) tubing runs while maintaining the same system pressure with less opportunity to leak… at a lower cost to install.

For specifications and ordering information please consult out “Medium Pressure Fittings and Tubing” brochure in our catalog or online at www. Autoclave.com. As always, Parker Autoclave products are backed by our global sales and support network and friendly service is only a phone call away.

Parker Autoclave Engineers – High Pressure is our business.

If you would like to receive pricing & availability on Parker Autoclave fittings please contact Forberg Scientific, Inc.    P: 855-288-5330    E: mechanicalsales@forberg.com

Heat Trace Cable Approved for Branch Sprinkler Systems Nelson LT and CLT Cable

Appleton Group proudly announces that Nelson’s LT and CLT self-regulating heating cables now have CSA and CSA-US approval for use on mains and branch sprinkler systems in both the United States and Canada. In addition, these heating cables now meet  IEEE 515.1-2012, and CAN/CSA C22.2 No. 130-03 standards.  And when installed according to instructions will meet the requirements of the NEC 2014-NFPA 70, and CEC 2015

 

Nelson self-regulating electric heat trace cables are now listed and certified for freeze protection from the main water lines to the sprinkler heads. It’s a simpler, safer method of freeze protection.

• Simple - Far less maintenance and lower costs than existing methods.
• Reliable - Water will always be immediately available to the sprinkler heads rather than having to travel from the main lines. No potentially harmful antifreeze chemicals are needed.

What makes heat trace better?

• Provides automatic heat to branch sprinkler lines when needed. Self-monitoring temperature controls ensure that heat is applied to pipes as soon as it’s needed.
• Self-regulating heat output means the system automatically regulates temperature, reducing electricity use and allowing for cable to be overlapped without the risk of hot spots.

A better alternative - Up until now, you have only had two options for freeze protection from main water lines to sprinkler heads. Unfortunately, both these options come with downsides.

• Dry systems require paying a professional annually to flush out the sprinkler system. Dry systems also mean that it may take water longer to reach the sprinkler system from the main water lines in the event of a fire, and the empty sprinkler system is vulnerable to rust caused by trapped moisture.
• Chemical systems require adding antifreeze to the pipes. This method requires you to buy and add chemicals regularly. It also carries the risk of antifreeze leaking into drains and ground water, or being sprayed in your facility during a fire.

Applications:

• Warehouses
• Loading docks
• Outdoor areas for Restaurants, banquet halls and night clubs
• Arenas and stadiums
• Walk-in freezers
• Car washes
• Parking garages

   

With the addition of these new approvals, Nelson LT and CLT  heating cables will now be able to provide complete protection for fire sprinkler systems.  For more information, please visit our website at www.forberg.com or contact Forberg Scientific, Inc. Customer Support and Technical Support at 1-855-288-5330 for any additional  inquires.

DSO Valve Stems | Choosing The Right Brand Makes A Difference

Not all valve stems are the same, a commodity that can be chosen on price alone. Nothing could be further from the truth. Product failures not only cost money but most importantly valuable production time. DSO™ makes long lasting, quality products that will save both time and money in the long run. Below are some of the key POD's that make of the DSO™ Difference:

• DSO™ bonds the rubber to a 316L SS head. This prevents the rubber from delaminating from the core and possibly ending up in the product stream in addition to proving longer life. Most competitors simply mold over the core without a bonding agent.
• DSO™ stems have a fully machined shaft unlike the competition who use a rough cut. This provides a better fit as well as lessening the chances for contamination from trapped particles.
• DSO™ rubber molds are all chamfered providing super fit and function while competitors eliminate that additional manufacturing step to save costs. Their product has a decidedly unfinished appearance.
• All DSO™ shafts are checked for straightness and concentricity before shipping. We have seen plenty of competitor product that cannot say that. Out of round or bent shafts do not have a good life expectancy or good performance.
•  DSO™ only uses 3A-1803 Certified rubber. DSO™ is listed on the 3A website as an approved supplier, some competitors are not. That is a potentially huge advantage.
•  DSO™ rubber is typically 90 to 95 durometer which is harder than the typical 85-90 rating of the competitors. Harder rubber provides a longer life, decreasing maintenance time, and saving money.

Despite providing a product made to a higher level of quality DSO™ remains very cost competitive. Add in the longer life expectancy of the products from a more complete manufacturing process and customers will save money. DSO™ provides sample products allowing customers to see and feel the difference.

Find DSO™ valve stems and other related parts at Forberg Scientific's website.

Topworx Go Switch Submersible Switch

Emerson Process Managements GO™ Switch Submersible Solutions.

All TopWorx Go Switch models offer
higher reliability with increase safety
and lower installation cost.

Subsea GO™ Switches are used in ocean, lakes, rivers and waste water facilities. 

• Provide a reliable seal against water intrusion. 
• Superior protection against water containing heavy sediments and salt content. 
• Wet-pluggable connectors allow for easy installation. 

Submersible GO Switches are designed for pools, fountains, reservoirs and water processing facilities.

• Cost effective solution for clean water applications. 
• Completely sealed enclosure suitable for continual submergence. 
• Trouble-free position sensing in underwater applications 

All GO Switch models are engineered to meet tough applications while offering high reliability and installation flexibility. These rugged, dependable, and affordable models are designed to operate in the following process industries with increased safety and lower installation cost: 

• Municipal and Waste Water 
• Power 
• Locks & Dams 
• Ships & Vessels 
• Drawbridges 
• Off-Shore Applications 

If you would like to receive more information about Topworx Go Switches please contact Forberg Scientific, Inc. customer service.
Toll Free: 855-288-5330
Email: mechanicalsales@forberg.com

Parker Veriflo ChangeOver System

ChangeOver System
Continuous Gas Management

Customer Value Proposition:

The ChangeOver System is a compact turnkey module that assists the operator with their total gas management. The COSE maintains a continuous gas delivery from two separate sources allowing for maximum cylinder gas usage from one source before automatically switching to the second source. The COSE lowers speciality gas costs by maximizing the consumption of gas from each cylinder. In addition, the gas cylinder bank(s) can be monitored remotely utilizing the optional pressure switches reducing the need for visual inspection by the operator.

Product Features:
• Fully enclosed to protect internal components
• Removable side panels for field maintenance
• Allows change out of depleted cylinder(s) while maintaining gas flow
• Especially suited for continuous on-stream analyzers
• Alarm sensor port for systems integration allowing user to monitor gas consumption
• Cleaned for Oxygen service
• Regulator design integrates positive upward and downward stops which increases cycle life by preventing over stroking of the diaphragm

Parker Veriflo ChangeOver System Applications

Specialty Gases
All Specialty Gases used for Process and Purging Applications

Industrial/Analyzer

• Refineries
• Test Cells
• Emission Analysis
• Laboratories
• Laser Gas Systems
• Research and Development
• Gas and Liquid Chromatography
• High Volume Gas Manufacturing Facilities

If you would like to receive more information, pricing and availability on the Parker Veriflo ChangeOver System or other Parker Veriflo products please contact Forberg Scientific customer service.

Toll Free: 855-288-5330

Email: mechanicalsales@forberg.com

NK Technologies Power Monitoring Measurement

New APT Power Transducer Now Available With 24VAC/DC, 120VAC or 240VAC Power Supply Options

Using three current transformers and connected directly to the primary circuit voltage up to 600 VAC, the APT transducer produces an industry standard analog signal of 4-20mA, 0-5 or 0-10 VDC in direct proportion to the watts consumed. The output signal allows you to monitor the power used and report the use to a website, a local display, or to be used to send alarms when the power rises to abnormal levels or falls to unexpected levels.

The APT power transducer can be configured to accept five amp secondary current transformers or the safer ProteCTTM low voltage output sensors. Either type of current sensing will produce an accurate output signal to help you identify areas of excessive energy consumption and allow intervention to reduce demand.

Features:

• 4-20 mA, 0-5 or 0-10 VDC Output
• Externally Powered: 24VAC/DC, 120VAC or 240 VAC supply options
• Low Profile Reduces Cabinet Depth Requirements
• Compact DIN Mounted Housing
• Finger Safe Terminals Clearly Labeled for Quick Installation

Applications:

• Monitoring power consumption with the APT Power Transducer is useful in many applications including:
• Measuring the power usage of a single piece of equipment, an area of a plant or the entire facility.
• Detecting conveyor jams and overloads and checking that the belt is loaded properly.
• Detecting dry run from clogged pump intake or discharge lines and monitoring impeller cavitation and bearing wear.

Read more application information here.

If you would like to receive more information about NK Technologies products please contact Forberg Scientific.
Toll Free: 855-288-5330
Email: mechanicalsales@forberg.com

 

WIKA S-20 Pressure Transmitter it is Versatile & Robust

WIKA Instrument, LP (WIKA) now offers the S-20 pressure transmitter, which is designed for 
a wide range of applications and demanding measurement requirements.

 
WIKA Instrument, LP (WIKA) now offers the S-20 pressure transmitter, which is designed for a wide range of applications and demanding measurement requirements. The pressure transmitter provides continuous measuring ranges between 0 ... 10 and 0 ... 20,000 psi, which can be combined with state-of-the-art output signals, process connections and electrical connections.
 
Users have the option to order the S-20 with three different accuracy classes (0.125 %, 0.25 % and 0.5 % BFSL), extended temperature ranges and customer-specific pin assignments. The S-20 pressure transmitter delivers accurate results even under the most adverse environmental conditions.
 
WIKA’s state-of-the art manufacturing processes ensure fast delivery of virtually any combination of desired options.

>>  Fore more information on this product, click here 
 
You can also contact Forberg Scientific for pricing and availability on the WIKA S-20 Pressure Transmitter or any of the other products WIKA Instrument has to offer.
Toll Free: 855-288-5330
Email: mechanicalsales@forberg.com

Water Monitoring Can Save Lives

Reliable process control is essential to achieve the right “fingerprint” of water.

Author: Endress + Hauser
Newsroom: Water Monitoring

Water is increasingly being considered a valuable product in most countries. Therefore, the acceptance for water wastage is continuously decreasing and the need to control the water quality is rising. This requires better and more reliable control of our drinking water.

Benefits:

• Fast commissioning
• Plug-and-Play-Solution for easy adaption to existing systems
• Fast reaction to changes due to low tube size (1L/min), in combination with serial order of sensors, the amount of water is minimized
• Best available signal stability (low drift over the long-term)
• Cost savings due to low maintenance
• Proved and tested, used in many solutions

High quality awareness
At ‘critical control points’ (CCPs) the water is checked to ensure the highest quality at the customers taps. CCPs are usually located at the most relevant points in the plant’s process, at the outlet and at dedicated positions in the distribution network, and used to detect hazardous situations in water production and distribution in order to begin countermeasures if necessary. Example: Water of high quality typically shows low turbidity and therefore less risk of diseases caused by germs.

Easy and reliable with drinking water analysis panels
When monitoring drinking water, reliability and high measurement performance is essential which is exactly what you will benefit from when using Endress+Hauser’s drinking water panels. Combine any measurement parameters as needed, e. g. turbidity, free chlorine, pH or conductivity.

Profit from the advantages of the Memosens technology
The intelligent and robust Memosens technology provides traceability, documentation of measurement quality as well as maximized availability. The multi-channel and multiparameter transmitter Liquiline CM44x manages all sensors simply and safely thanks to the uniform operation concept of all Memosens sensors.

Sensors for safe drinking water

Drinking water analysis panels typically contain sensors in hygienic design as follows:

• Free chlorine: CCS142D
• pH: Memosens CPS31D
• Turbidity: Turbimax CUS52D
• Conductivity: Condumax CLS21D
• Nitrate / SAK: Viomax CAS51D
• Dissolved Oxygen: COS21D 

Keep in mind: Improved plant safety by monitoring the quality of critical control points in the plant and process can be obtained with reliable analysis panel solutions from Endress+Hauser. 

If you would like to receive more information about the products Forberg Scientific, Inc.carries please contact us.
Toll Free: 855-288-5330
Email: mechanicalsales@forberg.com

How to Install 70 Series Go Switch

Topworx GO™ Switch Introduction

GO™ Switches operate on the principle of magnetic attraction, reacting to ferrous metal or magnetic targets as they come within the switch's sensing range.

Although switches vary in design according to their intended applications, all GO Switches use permanent magnets which, when actuated by the presence of a ferrous or magnetic target, change the state of electrical contacts.

70 Series GO™ Switch Mounting

• 70 Series GO Switches are unaffected by weld fields and RF interference.
• 70 Series GO Switches may be mounted adjacent to or surrounded by ferrous metals however the proximity of ferrous metals will affect sensing distance. For the maximum rated sensing distance, avoid mounting near ferrous metals.
• GO Switches sense ferrous materials such as mild steel, 400 series and 17/4 stainless steel.
• Sensing and differential of switch may vary depending on target travel direction.
• Avoid contact between target and switch. Configure mounting of switch and/or target so that target passes within the sensing area. Sensing range will vary according to model number and mass of target used.
• Target magnets, available through TopWorx, will increase the sensing range of the switch. Reference sensing ranges in corresponding sections throughout the catalog.
• For optimum performance, provide sufficient mass of target, and choose the appropriate GO Switch model to match the application requirements for operating frequency, type of load, etc.
• Greater target mass and target movement fully into and out of sensing range will increase contact pressure. This is helpful in low current controls applications.
• For heavy or inductive loads, arc suppression devices, or interposing relays are recommended for contact longevity. Contact factory for specifics.
• Do not use excessive force on external threads when installing. For typical installations: Torque 3/8" threads to 60lbs-in (7 Nm) max. Torque 5/8" threads to 35 lbs.-ft. (47 N-m) max. Consult TopWorx technician for special installations.
• Configure mounting so bracket dissects switch as close to the middle of the body as possible. This eliminates undue stress caused by heavy cables, connectors, etc.
• Two appropriately sized jam nuts are included with switch. Lock washers are recommended where vibration is present.

70 Series GO™ Switch Specifications - SPDT

Sensing Distance:
71 & 72: .040" (1.02mm) 2,000 PSI
73-77, 7L: .100” (2.54mm) 2,000 PSI
73-77: .072” (1.83mm) 5,000 PSI
73-77: .060” (1.52mm)10,000 PSI

Range with Target Magnet: Up to .35” (Model 71 & 72 up to .15")

Differential:
Approx. .020" (.5mm)

Thread Options:
71, 72: 3/8-24 UNF; M12 x 1
73-76, 7L: 5/8-18 UNF; M18 x 1

Response time: 8 milliseconds

Temperature Rating:
71-77: -40ºF (-40ºC) to 221ºF (105ºC) Std.*
71-77,7G, 7H: HiTemp to 400ºF (204ºC)*
7L: -40ºF (-40ºC) to 160ºF (71ºC)*
* Reference certificates for variations to temperature rating.

Contact Material: Palladium silver with Sawtooth® surface configuration

Contacts:
Single Pole, Double Throw, Form C

Electrical Ratings: Resistive
71-77:
4A @ 120VAC/3A @ 24VDC
2A @ 240 VAC/1.25A @ 48VDC
7L: .25A @ 120VAC/24VDC (approx. 5V drop)

Target Material: Ferrous metal; optional target magnets

Conduit Outlet: 1/2" -14NPT. One location

Enclosure Material: Stainless steel type 303, 316 optional; 7L - 316 stainless steel

Repeatability: .002" (0.05mm) Under identical operating conditions

70 Series GO™ Switch Specifications - DPDT

Sensing Distance: .090" (2.3mm) end sensing (2000 PSI)

Range with Target Magnet: up to .20” (5mm)

Differential: Approx. .020"(.5 mm)

Thread Option:
7G, 7H: 5/8"-18 UNF; M18 x 1
7I: 1"-14 UNF

Response time: 8 milliseconds

Temperature Rating:
-40°F (-40°C) to 221°F (105°C)*
HiTemp option to 400°F (204°C)*
* Reference certificates for variations to temperature rating.

Contact Material: Palladium silver with Sawtooth™ surface configuration

Contacts:
Double Pole Double Throw, 2 Form C.
 

 
Electrical Ratings: Resistive
3A @ 120VAC/1A @ 24VDC

Target Material: Ferrous metal; Optional target magnets

Enclosure Materials: Stainless Steel type 303, 316 optional

Conduit Outlet: 1/2”-14 NPT. One location

Repeatability: .002" (0.05mm) typical under identical operating conditions

Setting Up A 70 Series GO Switch For Optimum Performance

GO Switch 70 Series end sensing switches use three permanent magnets and a push pull plunger to control a set of mechanical contacts. The center magnet simultaneously attracts the primary magnet and repels the bias magnet, pushing the connecting rod and common contact into the normally closed position, closing a contact circuit. When a ferrous or magnetic target enters the sensing area of the switch, it attracts the primary magnet, which pulls the connecting rod and common contact. The normally closed and normally open contacts change state.

The sensing distance is the maximum distance between the switch and target when the switch first operates; the trip point. The differential, also known as deadband or hysteresis, is the distance that the target must move from the sensing area in order to allow the switch to reset.

To apply the 70 Series GO Switch and obtain the least differential, the direction the target approaches the switch must be considered. Below are two possible orientations that illustrate the differences in target movement and the affects on switch differential.

The measurements shown are nominal and can vary as much as .030-.050” depending on the material and size of target used in the application. As you can see, the best scenario for least differential is to orient the switch and target as shown in Orientation B. However, in this application, the possibility of getting debris between the switch and target must also be considered.

When trying to determine differential of an application, it is directly proportional to the distance the target will travel in the application. For example: a linear valve stroke is 1”. A switch is applied to indicate the closed position of the valve.

Using Orientation A, the differential is 0.090 “. The ‘deadband’ is therefore 9% of travel. If the switch were re-oriented, as shown in the Orientation B, the deadband would be only 2% of the total valve travel. Remember, there is no exact science to use when applying a GO Switch. However, once the switch is set, and the target travels to the same position every time (within .002”), the GO Switch will maintain calibration for life. Set it and forget it!

Attachment of Conduit or Cable to 70 Series GO™ Switch

Attach conduit or cable correctly.

•  When using long runs of conduit or cable, place supports close to the switch to avoid pulling switch out of position.
• If switch is mounted on a moving part, be sure flexible conduit is long enough to allow for movement, and positioned to eliminate binding or pulling.
• For installation in hazardous locations, check local electrical codes.
• All conduit connected electrical devices, including GO Switches, must be sealed against water ingression through the conduit system. In figure 1, something common has occurred, the conduit system has filled with water. Over a period of time this may cause the switch to fail prematurely. In figure 2, the termination of the switch has been carefully filled with electronics grade RTV to prevent water ingression and to prevent premature switch failure. A drip loop with provision for water to escape has also been installed. For hazardous locations install per Electrical Code. Dry contact devices, such as GO Switch, maybe installed intrinsically safe with matched barrier. When installed as explosion proof, lead seal fittings required within 18" of switch.

For hazardous locations install per Electrical Code. Dry contact devices, such as GO Switch, maybe installed intrinsically safe with matched barrier. When installed as explosion proof, lead seal fittings required within 18" of switch.

 
 
All GO Switches are "pure" contact switches, meaning they have no voltage drop when closed, nor do they have any leakage current when open. For multi-unit installation, switches may be wired in series or parallel, as shown below.

GO™ Switch 70 Series Wiring

Any number of GO Switches may be wired in series, without voltage drop. By contrast, solid state switches have about two volts drop across the switch when operated. In a 12 volt solid state system with four switches in series, 8 volts is dropped across the switches. Only 4V is left to operate the load. When using GO Switches, 12V is still available to operate the load. (Except 7L - approx. 5V drop)

GO™ Switch 70 Series Parallel Wiring

When solid state switches are placed in parallel, there is about 100 microamps leakage through each switch. If ten solid state switches were wired in parallel, the total leakage current would be 1000 microamps or one milliamp - sufficient current to indicate an "ON" condition to a programmable logic controller (PLC). Any number of GO™ Switches may be wired in parallel, with no current leakage and without drawing operating current. (Except 7L - approx. 5V drop)

 

Air and Hydraulic Cylinders

A ferrous cylinder cushion or piston will actuate the switch. To determine the correct thread length, measure the distance from the head cap surface to the cushion and add 1/2" for seal nut.

Thread seal nut onto switch. Screw switch into cylinder by hand until switch touches cushion. Back out 1/4 to 1/2 turn. Tighten seal nut.

Cylinder Applications Switch Sealing Torque Values
Models 71-72:
3/8" Diam/12mm
Torque Jam Nuts to:
15 lbs-in to achieve seal at 2,000 PSI
30 lbs-in to achieve seal at 5,000 PSI
Do not exceed 60lbs.-in (7N-m)

Models 73-76 & 7L:
5/8" Diam/18mm
Torque Jam Nuts to:
15 lbs-ft to achieve seal at 2,000 PSI
25 lbs-ft to achieve seal at 5,000 PSI
Do not exceed 35lbs.-ft (47 N-m)

 

 

Special Conditions for Safe Use and Possible Misuse

• The oversheathed or individual conductors must be suitably protected against mechanical damage and terminated within a terminal or junction facility suitable for the conditions of use.
• Three wire/three pin devices are not provided with an external connection facility for the earthing or bonding conductor. It is the user's responsibility to ensure adequate earth continuity via the mounting arrangements.
• Both contacts of the Double Throw and the separate poles of the Double Pole switch, within one proximity switch must form part of the same intrinsically safe circuit.
• The proximity switches do not require a connection to earth for safety purposes, but an earth connection is provided which is directly connected to the metallic enclosure. Normally an intrinsically safe circuit may be earthed at one point only. If the earth connection is used, the implications of this must be fully considered in any installation. i.e. by the use of a galvanically isolated interface.
• The switch must be supplied from a Certified Ex ia IIC intrinsically safe source.
• The flying leads must be terminated in a manner suitable for the zone of installation.
• An external ground connection must be protected by an external mounting device and / or cable connections / conduits.
• For 74 Series switch, temperature and environmental temperature are marked T6 / T85 ° C (-20 ° C ≤ Ta ≤ +50 ° C).

Ex d IIC, Ex tD A21 IP66 T85°C (Tamb = -20°C to +50°C)
Ex d IIC, Ex tD A21 IP66 T200°C (Tamb = -40°C to +150°C)
For 74 Series with Niltox cable only. Ex d IIC T6 Gb, Ex tb IIIC T85C Db, IP66 (Tamb –20°C to +50°C)
Baseefa08ATEX0360X
IECEx BAS 08.0122X
120VAC/4A AND 24VDC/3A FOR SPDT SWITCHES
120VAC/3A AND 24VDC/1A FOR DPDT SWITCHES

Ex d IIC T6 Gb, Ex tb IIIC T85°C Db IP66 (-40°C < Ta < +50°C)
Ex d IIC T4/T3 Gb, Ex tb IIIC T135°C/T200°C Db IP66 (-40°C < Ta < +100°C/150°C)
For 74 Series Niltox cable only:
Ex d IIC T6 Gb, Ex tb IIIC T85°C Db IP66 (-20°C < Ta < +50°C)NCC 12.1268X

Ex ia IIC T6 Ga, Ex ia IIIC T85°C Da (Tamb = -40°C to +50°C)
Ex ia IIC T4 Ga, Ex ia IIIC T135°C Da (Tamb = -40°C to +100°C)
Ex ia IIC T3 Ga, Ex ia IIIC T200°C Da (Tamb = -40°C to +150°C)
Baseefa09ATEX0173X
IECEx BAS 09.0080X
Ui = 30V and Ii = 250mA

Reference Baseefa Certificate for special conditions. All area classifications are dictated by the model number. Reference GO Switch brochure for complete listing.

For 7L Series GO Switch with “E” approval the following statements apply:

• This equipment is suitable for use in Class I, Division 2, Groups A,B,C & D, Class II, Division 2, Groups F&G and Class III or non-hazardous locations only.
• Warning-Explosion Hazard- Substitution of components may impair suitability for Class 1, Division 2.
• Warning-Explosion Hazard - Do not disconnect equipment unless power has been switched off or the area is known to be non-hazardous.

If you would like to receive more information, pricing or availability on the Topworx GO Switches please contact Forberg Scientific, Inc.
Toll Free: 855-288-5330
Email: mechanicalsales@forberg.com