PTC-Thermistor-Relay with intrinsic safe Sensor-Input
Have been designed to monitor temperatures in areas with explosive gases (zones 0, 1 and 2) and in areas with combustible dust (zones 20, 21 and 22), e.g. at motors, bearings, transmissions or of temperatures of surfaces.
With the MSR 220 Vi from ZIEHL industrie-elektronik for the first time a PTC-Relay is available, that has an intrinsic safe sensor-input and that has an approval for the monitoring of temperatures at equipment in potentially explosive areas. Temperatures at 1 to 6 measuring-points can be measured with up to 6 PTC-Thermistors that are connected in series to the sensor-input. In contrast to solutions with external safety barriers the monitoring of the sensor for short-circuit keeps its function.
The device has an ATEX-approval according to directive 94/9/EG, identification Ex II (1) GD [Ex ia] IIC [Ex iaD] and a Safety Integrity Level SIL 1.