Outputs

This output is designed to enable detection of sensor faults. This is normally floating but is set to GND when the sensor fails. Thus it can be considered a "switch" which is closed when the sensor fails. This can be used to activate an alarm or relay and can also be monitored with a PLC. The output is an open collector current sink. The maximum rating of the transistor output is 24VDC at 150mA.

This is set to GND when low alarm is activated. It is floating at other times. Use the Configuration software to set the low alarm set point. The output can be used to drive an alarm relay or similar. The alarm can be set to trigger above or below the set point using the configuration software. The output is an open collector current sink. The maximum rating of the transistor output is 24VDC at 150mA. If a relay coil is connected or any other inductive load to the transistor outputs, a back EMF suppression diode must be fitted across the load.

This is set to GND when high alarm is activated. It is floating at other times. Use the Configuration software to set the high alarm set point. The output can be used to drive an alarm relay or similar. The output is an open collector current sink. The maximum rating of the transistor output is 24VDC at 150mA. If a relay coil is connected or any other inductive load to the transistor outputs, a back EMF suppression diode must be fitted across the load.

This is set to GND when the gas concentration is rising in the range from below the Control low set point to the Control high set point at which stage, it is set to floating. It remains floating until the concentration falls below the Control low set point at which point, it is reset to ground. Use the Configuration Program to set the Control set points. This output can be used to control, for example, a gas generator or vent in a process operation. The output is an open collector current sink. The maximum rating of the transistor output is 24VDC at 150mA. If a relay coil is connected or any other inductive load to the transistor outputs, a back EMF suppression diode must be fitted across the load.

STBY is a hardware toggle switch. If it is briefly pulsed (about 50ms) to GND it puts the sensor head into Standby mode and the S930s into Sleep mode. If pulsed again to GND it will return to normal operation. This can be used to protect the sensor during process room cleaning and/or to reduce power and extend sensor life when the sensor is not needed.

Note: When the output is floating, +0V should be measured between the output and +12V. When the output is activated, +12V should be measured between the output and +12V.