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Simpson Controllers / Meter Relays

3 1/2" and 4 1/2" 33 Series "Rugged Seal" Meter Relays with Amplifier Input --

Four models available for a wide variety of control, alarm, limit applications
Photo conductor sensing eliminates all interference with the indicating meter
Incorporates an amplifier input which drives a rugged high torque pivot and jewel or taut-band meter
All current ranges have a 50mV drop
"Rugged Seal" construction withstands rigorous environmental conditions
High-gain transistor switch circuit provides accurate switching with a "dead band" of no more than 0.5% of full scale
Fail safe circuitry opens output relays in the event of power failure
Calibration Accuracy: ±2% of full scale (DV voltage)
Control Point(s) Adjustment: Single 0-100% of arc; Double (Low limit) 0-95% of arc., (High limit) 5-100% of arc; Adjustable to within 4š of each other
Power: 108-132 VAC, 50-400 Hz
Operating Temp.: 5 to 50°C
Sealed metal case, glass window

High impedance, solid-state circuit eliminates thermocouple lead length adjustments
Thermocouple resistance may be anywhere from 0 to 100 ohms
All ranges use Simpson's rugged 1 milliamp pivot-and-jewel meter movement
Electronic cold junction compensation is standard

Field adjustable to match the rated load current for a motor with the 100% mark on the scale
Built-in adjustment potentiometer eliminates winding turns on current transformer
Built-in time delay eliminates the need for external time delays or manual overrides
Standard delay: 5 sec. Programmable 0-5 sec, using external resistor. Factory adjustable to 20 sec. Time delay occurs only when pointer is upscale of the setpoint, may be disabled with external jumper. No time delay on low setpoint
Scale: green 0-100%, red 100%-150%

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