JavaScript seems to be disabled in your browser. For the best experience on our site, be sure to turn on Javascript in your browser.

Home
Products
Air Quality
Humidity / Temperature Transmitters
Series RHP Humidity/Temperature Transmitter

Skip to the end of the images gallery

main product photo

Skip to the beginning of the images gallery

Representative image displayed of 657-1|Actual product may vary

657-1

Series RHP Humidity/Temperature Transmitter

Passive Temperature Outputs, Sintered Filter Options

Be the first to review this product

If you don't see your required configuration, please see the Series RHPX Humidity and Temperature Transmitter for additional options.

The Series RHP Humidity and Temperature Transmitter combine the voltage or current humidity transmitter output with a passive temperature thermistor or RTD output. Featuring polymer capacitance humidity sensors, models are available in 2%, 3% or 5% accuracies. Duct mounted transmitters are available with an optional two-line alpha numeric LCD display.

For models with resistive thermistors or RTD outputs, please click here for temperature to resistance lookup tables.

NIST CALIBRATION available in Product Configurator.

Product Applications

Air economizers
Outdoor temperature and relative humidity reference
Pool room humidity monitoring

Starting at $144.70

Filter By

OSA with 2% Accuracy

Sintered Filter Duct Mount 3% Accuracy

Sintered Filter OSA with 3% Accuracy

Grouped product items
Model	Description	Availability*	Qty	Price
RHP-3M10	Sintered filter duct mount humidity transmitter with 3% sensor, 4 to 20 mA humidity output.	1-2 Weeks*		$162.25
RHP-3M1A	Sintered filter duct mount humidity/temperature transmitter with 3% sensor, 4 to 20 mA humidity output, 10K Type III NTC thermistor temperature output.	1-2 Weeks*		$168.15
RHP-2O22	OSA mount 2% RH/temperature transmitter with 0-10 VDC RH output and 0-10 VDC temperature output.	1-3 days*		$176.15
RHP-2O20	OSA 2% RH transmitter with 0-10 VDC RH output.	Less Than 1 Week*		$153.15
RHP-3S2A	Sintered filter OSA humidity/temperature transmitter with 3% sensor, 0 to 10 VDC humidity output, 10K type III NTC thermistor temperature output.	Less Than 1 Week*		$169.50
RHP-3S2B	Sintered filter OSA humidity/temperature transmitter with 3% sensor, 0 to 10 VDC humidity output, 10K type II NTC thermistor temperature output.	Less Than 1 Week*		$169.50

Specifications

Relative Humidity Range:: 0 to 100% RH.
Temperature Range:: -40 to 140°F (-40 to 60°C).
Accuracy, RH:: RHP-2XXX ±2% 10 to 90% RH @ 25°C;RHP-3XXX ±3% 20 to 80% RH @ 25°C;RHP-5XXX ±5% 20 to 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).
Accuracy, Solid State Band Gap:: ±0.9°F @ 77°F (±0.5°C @ 25°C).
Hysteresis:: ±1%.
Repeatability:: ±0.1% typical.
Temperature Limits:: -40 to 140°F (-40 to 60°C).
Storage Temperature:: -40 to 176°F (-40 to 80°C).
Compensated Temperature Range:: -4 to 140°F (-20 to 60°C).
Power Requirements:: 4-20 mA loop powered models: 10-35 VDC; 0-5/10 V output models: 15-35 VDC or 15-29 VAC.
Output Signal (Model Dependent):: 4-20 mA; 0-5/10V @ 5 mA max.
Response Time:: 15 s.
Electrical Connections:: Removable screw terminal block.
Conduit Connection:: Duct Mount: 1/2" NPS; OSA: 1/2" (22.3 mm).
Drift:: <1% RH/year.
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. (See R-T Lookup Table).
Enclosure Material:: Duct mount sensor tube: PVC-UL 94 V-0; Duct mount sensor cap: Polycarbonate ABS blend-greater than UL 94 V-0; Duct mount electronics housing and cover: Makrolon® polycarbonate-UL 94V-HB; OSA: Polycarbonate.
Enclosure Rating:: Duct mount: NEMA 4X (IP66) for housing only; OSA: NEMA 4X (IP66).
Display:: Duct Mount only, optional 2-line alpha numeric, 8 characters/line.
Display Resolution:: RH: 0.1%; 0.1°F (0.1°C).
Weight:: Duct Mount: .616 lb (.3 kg) OSA: 1 lb (.45 kg).
Compliance:: CE.

Support Library

Model Chart

EXAMPLE	RHP	2	D	1	A	LCD	RHP-2D1A-LCD RH/Passive Temperature Sensor Transmitter, 2% accuracy, duct mount with plastic tip, 4-20 mA RH output, 10K @ 25°C thermistor (Type III), with LCD display.
SERIES	RHP						RH/Passive Temperature Sensor Transmitter
ACCURACY		2 3 5					2% Accuracy 3% Accuracy 5% Accuracy
HOUSING TYPE			D F M O S R				Duct Mount w/ Plastic Hydrophobic Filter Duct Mount w/Sintered Filter (n/a, use D option) Duct Mount w/ Plastic Hydrophobic Filter OSA (Outside Air) OSA w/Sintered Filter OSA w/Sintered Filter and Radiation Shield
RH OUTPUT				1 2 3			4-20 mA 0-10 Volts 0-5 Volts
TEMPERATURE SENSOR					0 1 2 3 A B C D E F		None 4-20 mA 0-10 Volts 0-5 Volts 10K @ 25°C Thermistor (Type III) 10K @ 25°C Thermistor (Type II) 3K @ 25°C Thermistor 100Ω RTD DIN 385 1KΩ RTD DIN 385 20KΩ @ 25°C Thermistor
OPTIONS						LCD NIST	LCD Display NIST Calibration

Questions

Question

What purpose does the sintered filter perform on the RHP transmitter and does its use preclude adding the LCD option? Is it recommended when transmitter is located just after blower but before cooling coil?

Answer

The sintered filter is recommended in applications where you expect to be close to the temperature limit of the RHP (near 140°F) because the sintered filter has higher temperature resistance than the standard fiber membrane filter. You can order the sintered filter version with or without an LCD screen.

Related

Series RHP

Question

I'm looking for a dual temp. and humidity gauge for an 8" duct. I'm wanting to remote read the temp and humidity on the incoming and outgoing air to an ERV unit. The RHP-3M11-LCD was recommended to me, however, it is a direct read. What would be the correct instrument to remote read the temperature and humidity from a distance of 8 feet. The 8" duct is in the attic and I want to read the result in the down-stair hall. I don't want to record nor program the unit, just read the performance.

Answer

The sensor recommended would be the best option we have for sensing temperature and relative humidity for your application. We do not have any options with a remote display that could stretch as far as you are asking, nor are there any on the market to my knowledge. In every case, you would need to utilize a process output, in this case 4-20 mA, to transmit the readings to a remote display(s) which would accept the process signal(s). If you are just looking for a remote readout to go with the RHP sensor with no control functionality, then you could look at one of our panel meters, possibly the SPPM, DPMA, DPMW, or DPMP & DPML series panel meters. For assistance selecting an appropriate panel meter, please contact our technical support group at 219-879-8000.

Related

Series RH-R

Series WHT

Series RHP

Model 657-1

Series RHP-E/N

Series HHT

Model 657C-1

Question

On the RHP series temp/humidity sensors, is it possible to get a model with a 0-10 V dew-point output and a 0-10 V temperature output? I need dew point output, and would prefer the temperature output to be configured as 0-10 V rather than one of the other formats. I can custom configure a model RHP-3W44, but I wasn't 100% sure that that model would be able to put out a dew point signal. Will it in fact do that?

Answer

I would recommend getting an RHP-3W22 instead of the RHP-3W44. This will give you just the 0-10V outputs instead of a combination 0-10V and 4-20 mA.

Related

Series RHP

Question

P/N: RHP-2W44-LCD Documentation (https://dwyer-inst.com/PDF_files/AQ_RHP_E_N.pdf) on p. 4 indicates that sensor can be replaced, but unable to identify P/N of replacement sensor and if to be source from Dwyer or others

Answer

The replacement sensors are no longer available. RHP-2W44-LCD is now an obsolete unit that has been replaced with the RHP-2N44-LCD series. The sensors in this unit are not field replaceable.

Related

Series RHP-E/N

Series RHP

Question

I purchased two of your RHP-2D11-LCD sensors. I am in need of the calibration values so I can convert the analog input values to the desired outputs (RH and temp). We have the sensors connected to an IoT system recording the analog data inputs to a portal.

Answer

0 to 100% RH. = 4-20 mA on the humidity side -40 to 140°F (-40 to 60°C). = 4-20 mA on the temp side.

Related

Series RHP

Model	Description	Availability*	Price
RHRS	6 plate solar radiation shield for sintered filter version RH transmitters.	1-3 days*	$58.95
A-RHP-FC	Replacement plastic hydrophobic filter.	1-2 Weeks*	$9.50
A-RHP-RT	Retrofit tool for fitting O-ring on RHP-D/M models for new filter A-RHP-FC	1-2 Weeks*	$35.75