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Home > Humidity > Humidity - 4-20mA Wall Sensors

Humidity - 4-20mA Wall Sensors

  • 3% accuracy
  • 4-20mA and 0-5/10V RH/Temp (RTD/thermistor options available)
  • Optional LCD and Override
  • Field replaceable element

Applications

  • HVAC room humidity and temperature measurement and control
  • Energy management/building control

Description

The HW Series is designed to monitor indoor relative humidity and temperature conditions and provide a proportional 4-20mA or 0-5/10V output. The sensor includes a field replaceable RH sensing element and optional add-on features including LCD, override button, temperature transmitter and RTD/thermistors to match project requirements. The LCD version includes options for provisional offsets for temperature (+/-5o) and RH readings (+/-5%) for in-field calibration.

Product     Price   Quantity
HW-3AA WALL RH, 3%, DISPLAY   $ 297.00
HW-3BA WALL RH, 3%, TEMPERATURE TRANSMITTER, DISPLAY   $ 312.00
HW-3EA WALL RH, 3%, 10K TYPE 2 THERMISTOR, DISPLAY   $ 312.00
HW-3EB WALL RH, 3%, 10K TYPE 2 THERMISTOR WITH OVERRIDE, DISPLAY   $ 321.00
HW-3AA-VAL WALL RH, 3%   $ 276.00
HW-3EA-VAL WALL RH, 3%, 10K TYPE 2 THERMISTOR   $ 291.00
HW-3EB-VAL WALL RH, 3%, 10K TYPE 2 THERMISTOR WITH OVERRIDE   $ 300.00

CLICK ON LISTED ITEM FOR SPECIFICATIONS.

List prices shown; trade pricing appears on orderpad for Senva Trade Accounts.
For qualified trade pricing, please contact us at 866-660-8864.
Oregon has no sales tax.

Easy to install and maintain

  • Dual 4-20mA and 0-5/10V output (jumper selectable)

3% RH field replaceable sensor

  • On-board temperature compensation for RH eliminates temperature coefficient errors achieving excellent measurement accuracy, high repeatability and offset stability

Customize to meet project requirements

  • Optional LCD with provisional offsets for temperature (+/-5o) and RH readings (+/-5%) for in-field calibration
  • Select analog temperature transmitter or specified RTD/Thermistor for temperature sensing
  • Override button available

Quality

  • Industry leading 7-year limited warranty / 2-year RH element
Specifications
Power supply 3-wire voltage mode (0-5/10v) 12-30vdc/24vac(1), 15mA max
2-wire current mode (4-20mA) 12-30vdc, 30mA max
Outputs RH and Temperature (option) 3-wire 0-5/10v(4) or 2-wire 4-20mA
Output Scaling RH 0-100% RH
Temperature (jumper selectable) 32-122oF (0-50oC) or -40-140oF (-50-50o C)
Thermistor/RTD Options   See ordering table
Relative Humidity            Accuracy  +/-3% over 20 to 75% range
Resolution  0.05%RH 
Hysteresis  +/-1%RH 
Non-linearity  Factory linearized <1%RH 
Temperature coefficient  Fully compensated by on-board sensor 
Response Time(2)  30s 
Output update rate  2s 
Operating range 

0 to 100%RH (non-condensing)

Long term drift   <0.05%RH per year 
Operating conditions(3)    -20 to 60oC @ RH > 90%
 -20 to 70oC @ RH = 50%
 Temperature (transmitter)       Accuracy (-20 to 70oC range)  <+/-2oC; 0.5oC @ RH > 90%
 Resolution  0.01oC
 Repeatability  +/-0.1oC
 Response Time(2)  30s
 Output update rate  2s
 Operating range  -40 to 70o

(1) One side of transformer secondary is connected to signal common. Dedicated transformer is recommended.
(2) Time for reaching 63% of reading at 25oC at 1 m/s airflow.
(3) Long term exposures to conditions outside normal range or high humidity may temporarily offset the RH reading (+3%RH after 60 hours).
(4) 15-30vdc/24vac power supply voltage required for 10 volt output.