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