Material moisture monitor
max. 150 psig, 115 VAC | 20506 series Twin Tower Engineering

The electronic humidity alarm alerts the dry contactor to close when wet air is detected and a red alarm light warns the end user moisture is in the air stream. The dry-contact alarm signal can be monitored at a remote location, wired to energize a horn or buzzer. The alarm operates on 115 volt AC power and is enclosed in a NEMA 4 rated box.

The electronic humidity alarm is Installed downstream of a regenerative desiccant dryer. The humidity alarm consists of a resistance type humidity sensor, sensor housing with a bleed orifice, an electronic humidistat, remote alarm signal via dry contacts, and a red alarm light. A continuous sample of the compressed air contacts the sensor as it passes through the sensor housing and is exhausted through the bleed orifice. The pressure dew point of this air, under normal dryer operating conditions, is -40°F. While the sample air is dry, the humidistat energizes the remote alarm relay holding the remote alarm contacts open.