Dwyer Series RHP-E/N Wall Mount Humidity/Temperature/Dew Point Transmitter

Product Description

Optional LCD Display, Replaceable Sensors

he Series RHP-E/N Wall Mount Humidity/Temperature/Dew Point Transmitter is the most versatile room transmitter on the market. The stylish housing is well vented to provide air flow across the sensor to improve measurement accuracy. An optional LCD display can be integral to the transmitter or a remote display can be ordered for building balancing or LEED® validation. The LCD display indicates the ambient temperature along with the humidity or dew point. The transmitter has internal dip switches to select the temperature engineering units and whether the transmitter outputs humidity or dew point. The humidity and temperature sensors are field replaceable to reduce service cost and inventory. The humidity and the dew point are measured using a capacitive polymer sensor that completely recovers from 100% saturation. The humidity and dew point can have either a current or voltage output, while the optional temperature output can be a current, voltage, RTD or thermistor. For models with current or voltage for the temperature output, the temperature range is field selectable.

Product Applications

• Indoor Air Quality

Models

Specifications

Relative Humidity Range:

0 to 100% RH.

Temperature Range:

-40 to 140°F (-40 to 60°C) for thermistor and RTD sensors.
-20 to 140°F (-28.9 to 60°C) for solid state band gap temperature sensors.

Dew Point Temperature Range:

-20 to 140°F (-28.9 to 60°C); 0 to 100°F
(-17.8 to 37.8°C); 40 to 90°F (4.4 to 32.3°C); -4 to 140°F (-20 to 60°C) field selectable
ranges.

Accuracy:

RH: Model RHP-2XXX ±2% 10-90% RH @ 25°C; Model RHP-3XXX ±3% 20-
80% RH @ 25°C; Model RHP-5XXX ±5% 20-80% RH @ 25°C;
Thermistor temperature sensor: ±0.36°F @ 77°F (±0.2°C @ 25°C);
RTD temperature sensor: DIN Class B; ±0.54°F @ 32°F (±0.3°C @ 0°C);
Solid state band gap temperature sensor: ±0.9°F @ 77°F (±0.3°C @ 25°C).

Hysteresis:

±1%.

Repeatability:

±0.1% typical.

Temperature Limits:

Operating: -40 to 140°F (-40 to 60°C);
Storage: -40 to 176°F (-40 to 80°C).

Compensated Temperature Range:

-4 to 140°F (-20 to 60°C).

4-20 mA Loop Powered Outputs:

Power requirements: 10 to 35 VDC;
Output signal: 4 to 20 mA, 2 channels for humidity/solid state temperature sensor
models (loop powered on RH). Switch selectable RH/dew point. Switch
selectable normal or reverse output.

0-5/10V Outputs:

Power requirements: 15 to 35 VDC or 15 to 29 VAC;
Output load: 5 mA max., 2 channels for humidity/solid state temperature sensor
models. Switch selectable 0-10V/2-10V or 0-5V/1-5V output. Switch selectable
RH/dew point. Switch selectable normal or reverse output.

Solid State Band Gap Temp Sensor Output Ranges:

Switch selectable, -20 to 140°F (-28.9 to 60°C); 0 to 100°F (-17.8 to 37.8°C); 40 to 90°F (4.4 to
32.3°C); -4 to 140°F (-20 to 60°C).

Response Time:

15 seconds.

Electrical Connections:

Screw terminal block.

Drift:

<1% RH/year.

RH Sensor:

Capacitance polymer.

Enclosure Material:

White polycarbonate (European); Warm gray polycarbonate
(North American).

Display:

Optional LCD; Switch selectable %RH or dew point, °F/°C.

Display Resolution:

RH: 1%; Temperature: 0.1°F (0.1°C); Dew Point: 1°F (1°C).

Weight:

4.4 oz (125 g).

Agency Approvals:

CE.

Literature

Manuals

Instruction Manual

Catalog Pages

Series RHP-E/N Catalog Page

Approvals

CE Approval

Accessories

	Model Number	Description
	A-449	Remote display with mini USB display.
	SCD-PS	100 to 240 VAC/VDC to 24 VDC power supply.

FAQ

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.

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