Series RHP Temperature and Humidity Transmitter The materials included in this compilation are for the use of Dwyer Instruments, Inc. potential customers and current employees as a resource only. They may not be reproduced, published, or transmitted electronically for commercial purposes. Furthermore, the Company’s name, likeness, product names, and logos, included within these compilations may not be used without specific, written prior permission from Dwyer Instruments, Inc. ©Copyright 2014 Dwyer Instruments, Inc.

Introduction Combined humidity and temperature sensing The polymer capacitance humidity sensor is not affected by condensation, fog, high humidity, or contaminants

General Specifications Accuracy, RH: RHP-2XXX ±2% 10-90% 25°C RHP-3XXX ±3% 20-80% 25°C RHP-5XXX ±5% 20-80% 25°C Accuracy, Thermistor Temp Sensor: 25°C 77°F) Accuracy, RTD Temp Sensor: DIN Class B; 0°C 32°F) Output signal: 4 to 20 mA/ 0 to 5 mA max

General Specifications RH Sensor: Capacitance polymer Temperature Sensor: Types 1, 2, 3: Solid state band gap Curves A, B, C: Thermistor Curves D, E: Platinum RTD DIN 385 Enclosure: Duct mount: PBT; OSA: Polycarbonate. Enclosure Rating: NEMA 4X (IP66) for OSA mount only Agency Approvals: CE

Relative Humidity Relative humidity (RH) is the amount of water vapor in a volume of air as a proportion of the amount of water vapor the same volume of air will hold at saturation (100% RH) at any given temperature

Capacitance Polymer Humidity Sensors Works similar to a plate capacitor Consists of hygroscopic polymer between two electrodes One of the electrodes is a sensing surface Porous to allow water to pass in and out of polymer Keeps out condensation and contaminants As polymer absorbs water, its dielectric constant changes, creating changes in capacitance proportional to changes in relative humidity

Features Sensor RH range: 0-100% 15 second response time Sensor recovers 100% from saturation Factory calibrated, field replaceable sensors available

Features Wall mount Optional remote or integral LCD display Universal current/voltage output for humidity/temp. Resistive temp. Outputs available Replaceable sensors Well ventilated for more accurate measurements We couldn’t find an updated picture. This was from the website. -MS

Features Duct mount Weather resistant PBT construction Dual temp./RH output Optional display reads both temp. And RH Field replaceable sensor cap of filter Twist-off cover, no screws Available with membrane or sintered filter

Features Outside air NEMA 4X / IP66 housing Field replaceable sensor Multiple knock outs for conduit Screws anchored inside lid top Available w/ SS sintered filter or radiation shield

Applications Wall mount humidity/temp. Mounted in a room – sends signal to controller on vav system to adjust amount of air flow supplied to the space

Duct mount humidity/temp. Monitors the humidity of the air after a humidifier and the humidity in return duct for economizer applications. Applications

Applications Outside air humidity/temp. Used to determine if additional hot or cold water is needed to feed AHU