Www.hvac.vn Series RHP Temperature and Humidity Transmitter The materials included in this...
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Series RHPTemperature 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.
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Introduction
Combined humidity and temperature sensingThe polymer capacitance humidity sensor is not affected by condensation, fog, high humidity, or contaminants
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General Specifications
Accuracy, RH:RHP-2XXX ±2% 10-90% RH @ 25°CRHP-3XXX ±3% 20-80% RH @ 25°CRHP-5XXX ±5% 20-80% RH @ 25°C
Accuracy, Thermistor Temp Sensor: ±0.2°C @ 25°C (±0.36°F @ 77°F)Accuracy, RTD Temp Sensor: DIN Class B; ±0.3°C @ 0°C (±0.54°F @ 32°F)Output signal: 4 to 20 mA/ 0 to 10V @ 5 mA max
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General Specifications
RH Sensor: Capacitance polymerTemperature Sensor:
Types 1, 2, 3: Solid state band gapCurves A, B, C: ThermistorCurves D, E: Platinum RTD DIN 385
Enclosure: Duct mount: PBT; OSA: Polycarbonate.Enclosure Rating: NEMA 4X (IP66) for OSA mount onlyAgency Approvals: CE
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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
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Capacitance Polymer Humidity Sensors
Works similar to a plate capacitorConsists of hygroscopic polymer between two electrodesOne of the electrodes is a sensing surface
Porous to allow water to pass in and out of polymerKeeps out condensation and contaminants
As polymer absorbs water, its dielectric constant changes, creating changes in capacitance proportional to changes in relative humidity
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Features
SensorRH range: 0-100%15 second response timeSensor recovers 100% from saturationFactory calibrated, field replaceable sensors available
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Features
Wall mountOptional remote or integral LCD displayUniversal current/voltage output for humidity/temp.Resistive temp. Outputs availableReplaceable sensorsWell ventilated for more accurate measurements
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Features
Duct mountWeather resistant PBT constructionDual temp./RH output
Optional display reads both temp. And RH
Field replaceable sensor cap of filterTwist-off cover, no screwsAvailable with membrane or sintered filter
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Features
Outside airNEMA 4X / IP66 housingField replaceable sensorMultiple knock outs for conduitScrews anchored inside lid topAvailable w/ SS sintered filter or radiation shield
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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
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Duct mount humidity/temp.Monitors the humidity of the air after a humidifier and the humidity in return duct for economizer applications.
Applications
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Applications
Outside air humidity/temp.Used to determine if additional hot or cold water is needed to feed AHU