The Honeywell 4112 dew point transmitter represents a technological breakthrough in moisture measurement. Absolute moisture in processes at high pressure and temperatures up to 185 degrees Celsius (365 degrees Fahrenheit) higher than existing equipment is now a reality, opening the door to better product quality, improved thermal efficiency and longer process equipment life. The probe will also stand short temperature excursions to 204 degrees Celsius.

The H4112 dew point transmitter is a direct intrusion, FM approved dew point and dry bulb temperature transmitter for industrial environments. The transmitter measures dew point and dry bulb (process temperature) simultaneously with local indication and retransmitted 4-20 mA outputs. The transmitter is designed to meet the moisture measuring requirements of a wide variety of industrial processes. End-users can now measure moisture where they had previously been unable to do so because of temperature limits, contaminants and harsh environments.

Advanced probe/sensor design virtually eliminates temperature effects and parasitic capacitance interference. New advanced materials and sensor assembly techniques enhance performance in high process temperature conditions. H4112 also has superior tolerance to contaminants. Common solvents, dirt, oil and other pollutants do not affect the stability or accuracy of the sensor. Polymer coatings on the sensor have excellent environmental tolerance ensuring accurate and repeatable dew point measurements.

A porous platinum layer over the sensing polymer layer eliminates the sensing of external contamination and a final polymer topcoat protects the sensor. Although response time may be slowed by heavy contaminant layers, H4112 accuracy will not be impaired.