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

Repair Broken RTD & Thermocouples

A Modular Temperature Sensor Assembly System for the Instrumentation Maintenance Professional

The SENSOR BOX™ is a modular temperature sensor assembly system for the instrumentation maintenance professional. It can be your solution to expediting, high inventory and expensive downtime. One of the challenges in maintaining industrial temperature sensors is the variety. It is difficult for the typical process plant to stock every sensor configuration they might need to replace - until now. By combining common parts into a modular system, a relatively small amount of stock can translate into the variety you need - quickly, and without expediting.

You Have A Problem...
3:00 PM on a Friday afternoon, and you’ve just discovered a temperature sensor has failed in an important process. The Safety Engineer wants the process shut down, but you’re under pressure to keep production moving. You’re going to spend the rest of the afternoon in “Panic Mode,” calling every sensor supplier you can think of, begging for the best delivery at a premium. Not very pretty.

If this sounds familiar, then the SENSOR BOX™ was developed to help improve your life. Maintenance or instrument technicians can now build a new temperature sensor assembly, install it and the plant can be back up and running in minutes rather than days! The SENSOR BOX™ is designed for any plant where temperature sensors are an important part of the operation, and downtime is not an option.

Forberg Can Help
 The SENSOR BOX™ is a rugged toolbox containing all of the parts and tools to quickly and easily build the sensor you urgently need. It is:

• Flexible - adaptable to most process plants:
   - Power
   - Chemical
   - Refining
   - Offshore Oil Production
• Comprehensive - It can include a variety of sensor types and hardware of your choice.
• Self-contained - Everything you need to build the right product is at your fingertips.
• Industrial - The toolbox and tools are rugged, designed for hard duty.
• Easy to use - Complete, easy to follow instructions are included.

How We Do It
The Sensor Box™ can be your solution to expediting, high inventory and expensive downtime. One of the challenges in maintaining industrial temperature sensors is the variety. It is difficult for the typical process plant to stock every sensor configuration they might need to replace – until now. By combining common parts into a modular system, a relatively small amount of stock can translate into the variety you need – quickly, and without expediting.

You Have A Problem...
A Sensor Box™ is specified in three stages, to maximize its flexibility to your needs:
1. The foundation: the Tool Box and tools required to build sensors (everything you need will be close at hand!)

Sensor Box Installation & maintenance Manual
The Sensor Box Bulletin
The Sensor Box Re-order Form
(you can email us the re-order form at mechanicalsales@forberg.com)

If you would like to receive more information or pricing and availability on The Sensor Box, or other the other products UE Applied Sensor Technologies please contact Forberg Scientific, Inc.
Toll Free: 855-288-5330
Email: mechanicalsales@forberg.com

William's V-Dual Seal Plunger Metering Pumps

V-SERIES METERING PUMPS SIMPLICITY IN DESIGN, OPERATION AND MAINTENANCE

 

• PNEUMATIC OPERATION
• HIGH FLOW TURNDOWN
• INTRINSICALLY SAFE
• GREATER RELIABILITY
• CORROSION RESISTANT
• SIMPLE MAINTENANCE
• EASE OF INSTALLATION
• REPLACES OUR W&D SERIES PUMP

 

 

 

 

 

 

 

William's V-Series Metering Pumps PUMP FEATURES:

1. Stroke Adjuster is made more compact and adjustment is simplified with an internally threaded design. The positive locking device to hold stroke length is readily accessible and easy to operate.
2. The Pneumatic Piston and Fluid Plunger Assembly is guided at both ends on TFE composite bearings ensuring concentric movement of the plunger through the seals.
3. The clearance between the return spring and plunger has been optimized to eliminate any possible contact.
4. A true double sealing arrangement is used so that secondary seal containment is provided.
5. Lubrication has been simplified with the use of synthetic grease. The lubrication chamber is filled once over the life of the seals.
6. The bleeder is equipped with a barbed fitting for plastic tubing so that the fluid bled from the fluid chamber can be collected.
7. Both the discharge and suction check valves have tough TFE composite seats for long life and positive sealing.
8. Threaded port after the secondary seal provides for the indication, collection or containment of any seal leakage.

 
MATERIALS:
Wetted Parts: 316 SS
Check Valves:
  Body/Retainer/Ball: 316 SS
  Spring: Elgiloy
  Seat: TFE
Plunger: As specified
Bleeder: 316 SS
Seals: As specified
Pneumatic Section:
  Motor Cylinder Face Plate: 316 SS (V Model)
            Anodized Aluminum (X Model)
  Piston: Anodized Aluminum
  Piston Seal: Buna N
  Return Spring: 17-7ph
  Controller - MK XII: 316 SS (V Model)
            Anodized Aluminum (X Model)
 

William's V-Series Metering Pumps OPERATING CYCLE

POWER STROKE: As the CONTROLLER air or gas enters the PNEUMATIC DRIVE CYLINDER, the PISTON-PLUNGER ASSEMBLY is driven down into the FLUID CHAMBER, displacing fluid and compressing the RETURN SPRING. As the plunger displaces the fluid, the rise in pressure closes the SUCTION CHECK VALVE and opens the DISCHARGE CHECK VALVE. A precise amount of fluid, corresponding to the stroke of the plunger, is discharged.
 
SUCTION STROKE: When the air or gas is exhausted from the PNEUMATIC DRIVE CYLINDER the RETURN SPRING forces the PISTON-PLUNGER ASSEMBLY to return to its original position. The drop in pressure in the FLUID CHAMBER caused by the retraction of the piston allows the spring loaded DISCHARGE CHECK VALVE to close and the SUCTION CHECK VALVE to open so that the FLUID CHAMBER is again filled and ready for the power stroke.

If you would like to receive more information or pricing and availability on Williams Pumps please contact Forberg Scientific.
Toll Free: 855-288-5330
Email: mechanicalsales@forberg.com

Difference between welded and seamless stainless steel tubing?

What is the difference between welded and seamless stainless steel tubing?

Seamless stainless steel tubing is extruded and drawn from a billet.  Welded stainless steel tubing is produced from a strip that is roll formed and welded to produce a tube.

Welded stainless steel tubing is generally less expensive than seamless.  However, seamless stainless steel tubing is preferred for most instrument applications.

There are two main reasons for this:

 

1. Welded stainless steel tubing is considered to be inhomogeneous in the weld area, thus making it less corrosion resistant and giving it different malleability properties than seamless stainless steel tubing.  Recognized standards for the working of the weld area of stainless steel tubing are very open and allow for a wide range of homogeneity in the finished tube.
   
2. By code, the allowable working pressure of welded tubing is 20% less than that of seamless stainless steel tubing.
   

 

 

Forberg Scientific carries a large varietity of stainless steel tubing in both welded and seamless.  We can also provide different types of hard to find exotic material.  Please contact our customer service to receive pricing and lead times.

Toll Free: 1-855-288-5330

Email: mechanicalsales@forberg.com



LINC L471 Level Switch

 

L471 Application Options:

Used as a high & low level control, the L471 & L471SC can activate alarms, provide a switch input for control systems, or perform a variety of desired electrical switch operations actuated by a liquid or liquid interface.

 

L471 Operation:

As the float is moved by varying liquid height, a magnet is moved closer to or further away from a switch enclosure. As the magnet moves closer, a reed switch in the enclosure closes. As the magnet moves further away, the switch opens. The arm containing the magnet also acts as a counterweight for the float.

 
The float is small and will operate in liquids with a specific gravity as low as 0.4. The interface type will operate with a specific gravity differential as low as 0.1. This small float permits an economical installation in locations where other controls would be cost prohibitive. Available with a relay mounted in an explosion-proof case allowing the control of larger electrical loads. The manual override option allows the operator to manually move the float arm to the test switch position.
 

L471 Benefits:

• Easy to Repair: Repairs on-site in 20 minutes with the Quick-Change switch cartridge
• Easy to Field Test: The Manual Override option enables mechanical and electrical function testing while installed
• No Leaks: Environmentally-isolated design keeps operational fluids away from electrical circuitry
• Lower Operating Costs: Quick-Change, inexpensive replacement parts
• Lower Inventory: One L471 inverts for both High & Low level applications
• Versatile: One L471 provides both normally open, and normally closed switching by simply inverting the L471
• Safe: Certified as explosion-proof 1 for Hazardous Locations: Class I, Div. 1, Groups A, B, C, D; Class II, Div. 1, Groups E, F, G; and Class III, Div.1, by CSA a Nationally recognized Testing Laboratory in the U.S. and Canada
• Corrosion Resistant: Standard 316 Stainless Steel wetted and housing components for corrosion resistance
• Optional Corrosion Resistant Materials: Monel, Kynar, Teflon, Teflon Coated, Hastelloy C, PVC, Polypropylene, and Alloy 20
• Reliable: Sealed switch cartridge prevents dust, fluids, and corrosion from interfering with electrical circuity
• High & Low Pressure Applications: Available with Stainless Steel and Polypropylene displacer options for various process pressures.

 

 Key Features of the L471:

• All wetted parts isolated from the environment. These level controls are safe even in the event of fire.
• Certified as explosion proof for Hazardous Locations: Class I, Div. 1, Groups A, B, C, D; Class II, Div. 1, Groups E, F, G; & Class III, Div. 1.
• All 316 stainless steel wetted parts provide corrosion resistance. Also available in Monel, Kynar and other plastics.
• Our sealed switch assembly prevents dust, dirt, or moisture from affecting the level control's operation. Classified "Factory Sealed" by CSA/NRTL/C.
• Cartridge switch assembly provides easy field replacement and servicing.
• High or low alarm, normally open or normally closed operation simply by inverting the level control.

If you would like to receive pricing and availability for the LINC L471 Level Switches please contact Forberg Scientific, Inc. customer service.
Toll Free: 855-288-5330
Email: mechanicalsales@forberg.com

How to Select a Pressure Gauge

There are five primary items needed to properly select a pressure gauge:

1. Pressure Range – What pressure scale needs to be measured?
2. Dial Size – How large of a dial diameter is needed?
3. Connection Type – What size and orientation of connection is required?
4. Material – Should the wetted parts be brass or stainless steel?
5. Accuracy – What accuracy of measurement is required?

1. Pressure Range
What pressure scale needs to be measured?  Generally speaking the gauge pressure span should be double the normal operating pressure of the application it is used on.  In other words, if the normal pressure of the system is 150 psi, you should select a pressure gauge with a 300 psi range.  If a gauge with the exact range is not available, it is best to round up.  For example, if the normal system pressure is 100 psi and a 200 psi range is not available, it is preferable to round up to a 300 psi gauge.

 

2. Dial Size
How large of a dial diameter is needed?  Dial size is simply the diameter of the circular face of the pressure gauge.  When selecting a dial size, ease of reading and space available to mount the gauge are primary concerns.  Generally speaking, the larger the dial, the more expensive the pressure gauge.  The most common dial size is 2-1/2”.  Dial sizes can range from 1” up to 10”.
 

3. Connection Type
What size and orientation of connection is required?  The orientation of the connection refers to its location on the pressure gauge.  Choices of orientation are generally lower mount (protruding from the bottom of the gauge at the six o’clock position) or back mount (protruding from the rear of the pressure gauge).  The vast majority of pressure gauges are sold with male pipe thread connections ranging in size from 1/8” NPT to ½” NPT with ¼” NPT being by far the most common.
 


4. Material
Should the wetted parts be made of brass or stainless steel?  The wetted parts of the pressure gauge are the materials that come in contact with the fluid or gas being measured.  Stainless steel is more durable and more resistant to corrosion.  Brass is more economical.
 


5. Accuracy
What accuracy of measurement is required?  Pressure gauges are available with accuracies ranging from +/- 3/2/3% to +/- 0.1% of span.  The higher degree of accuracy required, the more expensive a gauge will be.  Common accuracies are 2-1/2%, 1%, and 0.5% of span.

Forberg Scientific Tech Support

If you are looking for pressure gauges please contact Forberg Scientific, Inc. customer service. Forberg can help with selecting a pressure gauge that will meet your application need.
Toll Free: 855-288-5330
Email: mechanicalsales@forberg.com