rh/rht series relative humidity and temperature transmitters the relative humidity (rh) and temperature transmitters are designed for continuous monitoring of relative humidity (rh) or relative humidity and temperature (rht). they provide accurate and reliable measurement for building automation and environmental control systems. the units feature very low profle sensor enclosures that are virtually unnoticeable in most installations. the rh and rht transmitters are available with 2%, 3%, and 5% rh accuracy (20% to 95% rh). for monitoring and controlling in critical environments, the units can be precision calibrated to 1% accuracy within a specifed rh range. the rh and rht transmitters provide a linear output of 4-20 ma corresponding to 0 to 100%rh. the rht transmitter also provides a 4-20 ma signal corresponding to any of the selected standard temperature ranges specifed. features ? space, duct, and outside air confgurations ? durable industrial enclosures ? low profle ? compact ? replaceable, plug-in bulk polymer resistance rh sensor ? resistant to contamination ? temperature compensation a mphenol advanced sensors ?
2 sensor enclosure the relative humidity and temperature sensors are housed in heavy duty, compact, locking enclosures. enclosures may be removed and painted, which further helps blend them into any environment. sensor the rh sensor incorporates a bulk polymer resistive element. the polymer is impervious to most contaminants and, since it is a bulk resistance device, surface contamination such as dust will not alter the accuracy of the readings. imbedded in the polymer is an interdigitated grid which senses resistance change as the polymer absorbs or emits molecules of water. transmitter the electronics are contained in a rugged pressure- cast aluminum weatherproof housing designed for maximum protection. continuous temperature compensation adjusts for temperature-induced change in the rh sensor output. the compensation provides high measurement accuracy over the entire operating range of the instrument. mounting template rh and rht duct mount rh/rht series specifications
3 mounting template rh space mount mounting template (side view) rh and rht outside air mount dimensions and mounting rh/rht series specifications
4 wiring guidelines outputs: relative humidity 420 ma current output the 4-20 ma transmitters will provide a linear proportional signal with 4 ma corresponding to 0% rh and 20 ma to 100% rh. these are loop powered devices; therefore, only two wires are required. 0-5 volt voltage output the 0 to 5 volt transmitters provide a linear proportional output at terminal o with 0 volts equivalent to 0% rh and 5 volts to 100% rh. the voltage output transmitters can be wired as a three wire transmitter or as a four wire transmitter to eliminate the effects of wire length. the output voltage is with respect to terminals n (power supply return) and/or g (signal ground) which are common at the transmitter. output: temperature (optional) the temperature option (if ordered) is a separate circuit board but mounted in the same housing along with the relative humidity transmitter. the 420 ma transmitters output is linear and proportional to the range specifed when the transmitter was ordered. the low range temperature (4 ma) is marked on the zero pot and the high range temperature (20 ma) is marked on the span pot. standard range is - 20 to 140f (this range is supplied when no range is specifed at time of ordering). the temperature transmitters are entirely separate circuits from the rh transmitters. transmitters are loop powered devices. therefore, only two wires are required. one wire may be common with the rh transmitter. wiring wiring for the transmitter should be twisted pair(s) 1622 awg approximately 2 turns per inch. in installations near electric motors or sensitive electronic equipment, use shielded cable. wiring should be run through conduit using the 1/2 emt compression ftting supplied on the unit. rh/rht series wiring
5 wiring diagram current unit wiring diagram voltage unit rh/rht series wiring
6 humidity sensing element resistance change of bulk polymer sensor performance accuracy at 77f (25c) 2% rh, 20-95% rh 3% rh,, 20-95% rh 5% rh, 20 -95% rh including hysteresis, linearity and repeatability mechanical: case material space: abs flame retardant duct: galvanized steel outside air: pressure cast aluminum and galvanized steel mounting confgurations space, duct, outside air temperature effect less than 0.06% per f (0.11% per c) sensitivity 0.1% rh repeatability 0.5% rh linearity see accuracy hysteresis less than 1% sensor interchangeability 3% nominal operating range rh sensor: 0%-99%, rh, noncondensing. -40f to +170f (-40c to +76c) electronics: 0%-95% rh, non.condensing. -40f to +130f (-40c to +54c) max. air velocity 10,000 ft/min output range 2wire. isolated loop, powered 4-20 ma, 0-100% rh (standard) adjustment zero: 20%. noninteractive span: 10%, noninteractive long term stability: less than 1 % drift/year typical power supply voltage 12-36 vdc max load w = supply 10 vdc 0.02 a storage temperature -85f to +158f (-65c to +70c) rh/rht series specifications
7 temperature sensing element platinum rtd, 4 wire measurement performance accuracy at 77f (25c) 0.5f (0.3c) temperature effect less than 0.01% per f (0.02% perc) sensitivity 0.1% rh repeatability: 0.1% rh linearity better than 0.1 % hysteresis less than 0.01% sensor interchangeability 0.5f (0.03c) output ranges 420 ma - 20f to + 140f (-29c to +60c) optional 0f to +150f (-18c to +66c) 0f to +100f (-18c to +38c) +32f to +132f (0c to +55c) +50f to +130f (+7c to +54c) -40f to + 140f (-40c to +60c) custom range adjustment zero: 10%. noninteractive span: 10%. non-interactive long term stability: less than 1% drift per year, typical humidity affects you and your operations. our local representative is ready to help in your application. call to discuss the proper selection of a humidity device from the worlds largest selection. specifcations are subject to change without notice. rh/rht series specifications
model rh - - - - ordering information example 1: to specify an rh transmitter. order: rh-2-i-s. exomple 2: to specify an rh transmitter with optional temperature sensor with standard range (-20f to + 140f), order: rht-2-i-s. options special calibration to 1% accuracy (20% rh span in 20%- 95% rh range) model rh code t with temperature code accuracy 2 2% 3 3% 5 5% code output i 4 - 20 ma current v 0-5 volltage dc code temperature channel range (optional) 1 -20f to 140f (standard) 2 0f to 150f 3 0f to 100f 4 +32f to +132f 5 +50f to +130f 6 -40f to +140f 7 custom range code mounting confguration s space d duct o/a outside air aas-920-509a-05/2014 www.amphenol-sensors.com ? 2014 amphenol corporation. all rights reserved. specifcations are subject to change without notice. other company names and product names used in this document are the registered trademarks or trademarks of their respective owners. a mphenol advanced sensors www.telaire.com
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