:: Rishabh Instruments ::

Transducer Trip

Application :

The Rishabh transducer trip will accept analogue signal from most measuring transducers and transmitters, in the form of d.c., voltages or currents. Inputs are monitored within the preset limits and in the event of the input moving outside these limits, the unit will initiate a trip signal via double pole changeover relay.
An illuminated LED indicates when the relay is energised.

Principle of Operation :

The input current is fed through a resistor and the resultant voltage is compared with a preset reference voltage from the set point potentiometer. Any voltage difference forms a command signal which is fed via an amplifier to a double pole changeover relay. As standard, the relay energises at high set point on a rising signal and de-energises at low set point on a falling signal.

Specifications :

Input :

Current d.c.

0-1, 0-5, 0-10, 0-20, 4-20mA Volt drop 1V

Voltage d.c.

1V to 50V, i/p resistance 10kΩ/V.
(Consult factory for higher voltage)

Voltage withstand

1.2 x continuos 1.5 x for 10 x 10s to
B.S. 6253

Set Point :

Repeatability

0.5% of span

Hysteresis

2 % preset

Adjustment

Low trip 0-80%
High trip : 40-120%

Time Delay

Up to 10 seconds adjustable

Auxiliary Supply :

A.C. 50/60 Hz

120V or 240V (+20%) (57 to 480V)

Burden

3 VA maximum

D.C. Voltage

12 or 24V (±20%)

Weight

Model 252 - appr. 0.4Kg
Model 253 - appr. 0.6Kg

Output Relay :

Type

DP Changeover

Rating A.C

240V,5A non-inductive

D.C

View chart

Operations

0.2 million at the above load

Reset

Automatic

	-	Protector Trip Relays
	-	A.C. Current Relay
	-	A.C. Voltage Relay with adjustable differential
	-	A.C. Voltage Relay with adjustable time delay
	-	Frequency Relay
	-	Combined Under / Over Voltage & Under / Over Frequency Relay
	-	Phase Sequence & Phase Failure Relay
	-	Phase Balance Relay
	-	Reverse Power (Current) Relay
	-	Synchro-Check Relay(Paralleling)
	-	D.C. Voltage Relay
	-	Thermistor Trip Relay
	-	Hot Spot 3 Relay
	-	Hot Spot 6 Relay
	-	Millivolt / Thermocouple Relay
	-	Transducer Trip
	-	Speed Sensing Trip Relay