Humidity alarms

Non-adjustable dew point alarms with resistor type sensor

Our non-adjustable dew point alarms are low-cost electronic alarms that are pre-set at the factory with no adjustment required other than calibration. They can be used for different point setting alarms by using different sensors with specific ranges of values.

 Model:       Sensor:
1013-9E       1013-9H 6180 Series
1013-9AA      6180 Series

Changes in air stream relative humidity cause corresponding electrical resistance changes in the sensor element coating, which is exposed to effluent air. A built-in resistor (7.5 megohms) applicable to the sensor’s humidity range in the air or gas system is used in conjunction with a calibration adjustment screw located in the humidity alarm box to provide the proper alarm sensitivity range. Both units require 120 VAC, 60Hz power input and provide an output of 12 VDC, energizing a relay with normally open contacts to power the alarm indicators.

All humidity alarms require the following additional components, available from Eaton:

1. Sensor (appropriate for alarm type)
2. Manifold for sensor
3. Cable resistor type

Sensors are tabulated in accordance with the % RH range.  They vary for the type of sensor/alarm, but in any case, permit alarm installation in the electrical enclosure away from the air gas stream.

Alarm Models

1.10287-51-1, 10287-51-2, 10287-3-1

2.10287-10

Our state-of-the-art humidity alarms comply with MIL standards and successfully passed Navy high-shock and vibration tests (per MIL-S-901C and MIL-STD-167). Models 10287-51-1 and 10287-51-2 incorporate a ten-turn potentiometer that can be easily adjusted to agree with numbers stamped on the face plate adjacent to the serial number of the sensor being used. These numbers represent a predetermined dew point alarm. 51-1 and 51-2 are physically identical; the second dash number references a specific value for the dew point alarm setting.

Model 10287-3-1 uses the same electronic components along with a red light for alarm set point indication and a test switch button for verification. Model 10287-10 offers a continuous read-out display of dew point conditions of the flow stream. Sensor calibration data is stored with a plug-in EPROM, eliminating the need for manual calibration adjustments.