Introduces the features, structures and electrical parameters of the ASCO series ISMR special service pilot valve, which is suitable for 24VDC voltage and has a maximum leakage current of 4.0 mA. It can be manually cycled, but must be manually reset for automatic operation
The ASCO ISMR Series Special Service Pilot Valves are intrinsically safe solenoid valves designed for installation in hazardous areas. They feature manual reset mechanisms that hold the valve in a latched position when energized and trip when power is interrupted. The valves are available in 3/2 and 4/2 configurations with brass or stainless steel bodies and various seat materials including NBR, PTFE, and FPM.
| Nominal voltage before the barrier | 24VDC +/- 10% |
|---|---|
| Maximum allowable off-state leakage | 4.0 mA |
| Minimum loop current for operation | 0.024 amps |
| Ambient temperature range (Brass) | -20˚C to 93˚C |
| Approvals | FM/FMc and CSA approved for IS Class I, Div. 1 Groups A, B, C, and D |
When energized, the valve holds the manual reset mechanism in the latched position.
The valve operates when the solenoid has been energized and the lever is latched while holding in the yellow button.
The valve trips when power is interrupted.