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ISR: 2 Channel Relay with Intrinsically Safe Outputs


• 2 Independent Relays


• Compact Design


• Contact or Probe Input


• Built-in De-bounce  



• Power and Output status



• Low Voltage Design for

  12 or 24VAC/DC


• Din Mounting


• 12 or 24VDC Battery



Two Channel Relay 

The ISR has two independent outputs to the hazardous area and two independent (dry contact) relay outputs. The outputs to the hazardous area can be switches or, when used with a conductive liquid, electrodes. When output “A” is completed (contact closed or low resistance), 0.5 second later the dry output contact “A” is closed and the “A” LED turns On. When output “A” is opened (contact opened or high resistance), 0.5 second later the dry output contact “A” opens and the “A” LED turns Off. “B” operates the same way, but is independent of “A.” There is also a supply power LED indicator. The ISR must be located and grounded in a non-hazardous location.




Supply Voltage: 12 or 24 AC/DC ±10%

Power: 1.5 watts

Inputs: Switch Closure or Probe

Input Sensitivity: 10k - 100k Ω

Pick-up & Drop-out Delays: 0.5 second

Max. Open Circuit Voltage: 5.9 volts DC

Max. Source Current: 0.1 milliamps

Output Rating @ 25°C:

     5 Amps @ 125VAC

     5 Amps @ 30VDC or 250VAC

     20,000,000 Mechanical Cycles



Mounting: Din Rail mount

Termination: Touch safe screw terminals, with lift mechanism,

     #12 AWG max.

Weight: 10 Oz.


Ambient Temperatures

Operating: 0°C to 55°C

Storage: -40°C to 85°C


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