Level Alarms and Level Controls

• RELIABLE CONTROL OF ALARMS, FUEL CUT-OUTS, PUMPS
• INSTALL ON BOILERS, TANKS, WATER COLUMNS FOR PRESSURES TO 1800 PSI

Actuate Electric Warning Signals Or Fuel Cut-Out.  Pressures To 350 PSI At 520° F

When tank or boiler levels reach predetermined high or low levels, the Levalarm will actuate bells, horns or lights. EA100D models are also used for fuel cut-out control.  The EA100D can be purchased with or without the body (Model EA100DLB).

Actuate Electric Warning Signals Or Fuel Cut-Out.  Pressures To 800 PSI At 520° F

When tank or boiler levels reach predetermined high or low levels, the Levalarm will actuate bells, horns or lights. EA100S models are also used for fuel cut-out control.  The EA100S can be purchased with or without the body (Model EA100SLB).

Operation is highly reliable and sensitive because the magnet counterbalances the float, allowing accurate use of the float's buoyancy.  Note that the magnet does not "slide", thereby eliminating any friction that could impede movement and accuracy.

For high temperature applications, a ventilated housing is available.  Also, when insurance or other regulations require two independent fuel cut-outs, two Levalarm's may be wired in series. Larger Image of EA100DP

Actuate Dual Fuel Cut-Out, Fuel Cut-Out & Low Alarm, Or Dual Fuel Cut-Out & Low Alarm.  Pressure To 800 PSI At 520ºF

These Levalarm models incorporate two independent controls, operating on different principles, and contained in a common body.  They are usually installed when insurance or other regulations require two independent fuel cut-out devices - which may share a common chamber.

One cut-out switch is float actuated, a second switch consists of one or two probes which extend into the water chamber, the chamber serving as a ground connection.

Probe Operation:  When water drops below the probe end, a relay is de-energized and opens the fuel cut-out circuit and/or closes the low alarm circuit.   A second probe, shorter, can actuate an alarm when water approaches the fuel cut-out point.

Relay control units, in specified NEMA enclosures, can be mounted virtually any distance from the Levalarm. See Full Size Levelarm Cut-a-way

The Levalarm Model EA100EPS is equipped with a switch housing that meets UL requirements for Class 1, Group D, Division 1 service.  In design, materials, and performance, this model is similar to Model EA100S.  Explosion proof models are ideally suited for chemical and petroleum field applications. Larger Image of EA100EPS

Recommended Control For Power Plants And Processing Facilities.  Pressures To 1800 W.S.P

Series EA101 models provide reliable and instant response. Probes respond to the rise and fall of water at predetermined points, to actuate a variety of controls. Each Levalarm monitors up to 3-inch level variation. Multiple units, in series, extend the monitoring range. Use almost anywhere on water applications.

Operation One Probe/One Relay: High Alarm -Low Alarm - Fuel Cut-Out (Low Alarm & Fuel Cut-Out At Same Level). Two Probes/One Relay: On And Off Pump Control Within 3-Inch Level Variation. Two Probes/Two Relays: Dual Fuel Cut-Out (Low Alarm & Fuel Cut-Out On Different Levels). Larger Image of EA101

For fuel cut-out only or fuel cut-out and low alarm.  Pressures to 450psi

EA15R is a probe type Levalarm featuring a pair of probes in a bronze body. Factory set cut-out levels may range from 2-1/2" to 5-1/2" above the lower water gage valve center. Minimum mounting centers: 12". When ordering, specify valve centers, and relay control unit. Also locate fuel cut-out point distance above centerline of valve connection. Larger Image of EA15R

Clark Reliance Relays Improve Reliability, Offer Installation Ease and Economy - Levalarm Models

• Each relay module is independently fuse protected.
• Plug-in relays are removed by hand, no tools required
• Relays supply low voltage (12 VAC) to Probes
• Relays enhance sensitivity for extremely low water conductivity applications, to 1 Micro Mho
• Relays improve switch contact reliability for low load applications such as computer interface, recorders
• Relays (like the ECID23) use integral LED indicators to verify status.
• Relays will retrofit existing system installations
• Larger Image of Enclosure & Relay

Typical Relay, Single Level Service - Direct Mode Operation (Standard) When water level rises to Terminal 3 Probe, water completes circuit. Circuit signals Relay to change state of load contacts, activating Alarm or other equipment, while illuminating integral LED. Relay is energized until water drops below Probe to break circuit, turning off Alarm and LED.

Inverse Mode Operation (Optional) Upon powering Supply Terminals 1 and 2, Relay energizes (LED on). When water rises to Terminal 3 Probe, Probe signals Relay to de-energize (LED off). Relay remains de-energized until water drops below Probe. Even during momentary power failures, Relay remains in "safe" mode in Low Level applications. Specify inverse mode, when required.