Series RHP Humidity/Temperature Transmitter

Passive Temperature Outputs, Sintered Filter Options

The SERIES RHP Temperature and Humidity 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.

Application Note:
For duct mount installations, the sintered filter option should be ordered for applications where the humidity transmitter is mounted in the supply air duct after the fan and cooling coils.

Product Applications

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

Models & Ordering

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Model Description Usually Ships Price Order
RHP-2D10
Ships: Same Day
Price: $114.50
Duct mount 2% RH transmitter with 4-20 mA RH output. Same Day $114.50 Order
RHP-2D11
Ships: Same Day
Price: $134.50
Duct mount 2% RH/temperature transmitter with 4-20 mA RH output and 4-20 mA temperature output. Same Day $134.50 Order
RHP-2D11-LCD
Ships: Same Day
Price: $184.50
Duct mount 2% RH/temperature transmitter, 4-20 mA RH output and 4-20 mA temperature output, with LCD. Same Day $184.50 Order
RHP-2D1A
Ships: Same Day
Price: $129.50
Duct mount 2% RH/temperature transmitter with 4-20 mA RH output and 10K Curve A passive temperature output. Same Day $129.50 Order
RHP-2D1B
Ships: Same Day
Price: $129.50
Duct mount 2% RH/temperature transmitter with 4-20 mA RH output and 10K @ 25°C thermistor temperature output. Same Day $129.50 Order
RHP-2D1D
Ships: Same Day
Price: $130.50
Duct mount 2% RH/temperature transmitter with 4-20 mA RH output and 100 Ohm RTD Curve D passive temperature output. Same Day $130.50 Order
RHP-2D1E
Ships: Same Day
Price: $130.50
Duct mount 2% RH/temperature transmitter with 4-20 mA RH output and 1K Ohm RTD DIN 385 temperature output. Same Day $130.50 Order
RHP-2D1F
Ships: Same Day
Price: $129.50
Duct mount 2% RH/temperature transmitter with 4-20 mA RH output and 20K NTC thermistor temperature output. Same Day $129.50 Order
RHP-2D20
Ships: Same Day
Price: $114.50
Duct mount 2% RH transmitter with 0-10 VDC RH output. Same Day $114.50 Order
RHP-2D22
Ships: Same Day
Price: $134.50
Duct mount 2% RH/temperature transmitter with 0-10 VDC RH output and 0-10 VDC temperature output. Same Day $134.50 Order
RHP-2D22-LCD
Ships: 1-2 Weeks
Price: $184.50
Duct mount 2% RH/temperature transmitter, 0-10 VDC RH output and 0-10 VDC temperature output, with LCD. 1-2 Weeks $184.50 Order
RHP-2D2A
Ships: Same Day
Price: $129.50
Duct mount 2% RH/temperature transmitter with 0-10 VDC RH output and 10K Curve A passive temperature output. Same Day $129.50 Order
RHP-2D2B
Ships: Same Day
Price: $129.50
Duct mount 2% RH/temperature transmitter with 0-10 VDC RH output and 10K @ 25°C thermistor temperature output. Same Day $129.50 Order
RHP-2D2D
Ships: Same Day
Price: $130.50
Duct mount 2% RH/temperature transmitter with 0-10 VDC RH output and 100 Ohm RTD Curve D passive temperature output. Same Day $130.50 Order
RHP-2D2E
Ships: Same Day
Price: $130.50
Duct mount 2% RH/temperature transmitter with 0-10 VDC RH output and 1K Ohm RTD DIN 385 temperature output. Same Day $130.50 Order
RHP-2D2F
Ships: Same Day
Price: $129.50
Duct mount 2% RH/temperature transmitter with 0-10 VDC RH output and 20K NTC thermistor temperature output. Same Day $129.50 Order

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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 (±0.3°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).
4 to 20 mA Loop Powered Models:
Power requirements: 10 to 35 VDC; Output signal: 4 to 20 mA.
0-5/10 V Output Models:
Power requirements: 15 to 35 VDC or 15 to 29 VAC; Output signal: 0 to 10 V @ 5 mA max.
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:
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:
Duct Mount: PBT; OSA: Polycarbonate.
Enclosure Rating:
NEMA 4X (IP66) for OSA mount only.
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).
Agency Approvals:
CE.

Features

  • 2%, 3%, or 5% accuracy models
  • Optional LCD display on duct mount models
  • Radiation shield option for outdoor installation in direct sunlight

Accessories

Model Number Description Usually Ships Price Order
A-452 Sintered filter, 1/4 NPSM. 1-2 Weeks $8.00 Order
A-453 Filter cap, 1/4 NPSM. 1-2 Weeks $6.00 Order
6 plate solar radiation shield for sintered filter version RH transmitters. RHRS 6 plate solar radiation shield for sintered filter version RH transmitters. Same Day $40.00 Order

Videos

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/Membrane Filter
Duct Mount w/Sintered Filter
40 Micron Filter HDPE
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

Product Literature

Manuals

Catalog Pages

Product Data Sheet

Approvals

Drawings

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.
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.
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.

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