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Technical Specification Sheet
Rev. 3, December, 2000
Document No. 149-359P25
Page 1 of 3
Room Relative Humidity and Relative Humidity & Temperature Sensor
The Room Relative Humidity and Relative Humidity & Temperature Sensors monitor and transmit standard signals for humidity and temperature that can be used with a variety of building control systems including the APOGEE Automation System. These units are especially suited for commercial HVAC control applications. Three models are available plain humidity sensing only, plain humidity and temperature sensing only, and humidity and temperature sensing in a full-featured version. All three models are available in either 5% accuracy, 2% accuracy, or 2% accuracy NIST (National Institute of Standards and Technology) certified versions.
Both the standard 5% accuracy and 2% accuracy versions are calibrated using a NIST traceable calibration standard. The 2% accuracy NIST certified versions are also calibrated using a NIST traceable standard, however, an additional three-point humidity calibration check and one-point temperature calibration check is performed and documented on a calibration certificate included with the sensor.
All units incorporate a bulk resistive polymer humidity-sensing element. The combination humidity and temperature units incorporate a 1K Ohm Platinum RTD temperature-sensing element.
All units have a RJ-11 jack located on the bottom of the sensor where the EasyCal Plus Humidity Calibrator can be connected to check the operation of the humidity sensor and perform a one-point offset adjustment if necessary.
The full-featured model offers a wide range of features and functionality that can be used with a variety of building control systems including the APOGEE Automation System. These features include:
Liquid Crystal Display (LCD): A two-line alphanumeric LCD allows simultaneous display of room temperature and relative humidity in degrees F or C. Relative humidity can also be displayed alone.
Digital temperature set point adjustment: The sensors keypad allows error-free digital temperature set point adjustments in one-degree increments. Set point values momentarily display as changes are made.
Override button: The flush mounted override button allows an occupant to change to an occupied control schedule during the unoccupied cycle for a predetermined time period.
Display of operating mode: Graphic symbols are displayed in the LCD to indicate the controllers operating mode. A sun indicates occupied mode operation and a moon indicates night mode operation.
Page 2 of 3 Siemens Building Technologies, Inc.
Specifications - Humidity Element
Operating range 0 to 100% RH
Accuracy at 77F (25C) 5% or 2% RH over 20-95% RH including hysteresis, linearity, and repeatability
Operating temperature 32 to 122F (0 to 50C)
Temperature effect Less than 0.06% per degree F (0.11% per degree C)
Output signal-RH only units 4-20 mA DC, 0-100% linear, proportional
Output signal-RH/T units 0-10 Vdc, 0-100% linear, proportional
Calibration requirements Annually (field calibration using the EasyCal Plus)
Polarity Protection Yes
Specifications Temperature Element (for combination humidity & temperature units only)
Operating range 32 to 122F (0 to 50C) RTD Calibration Point 32F (0 C)
Sensing Element 1K Platinum RTD
Output Signal 0-10 Vdc, 32 to 122F (0 to 50C) linear, proportional Set point adjustment range 73F 10F (23C 10C) Calibration requirements None required
Installation 750 feet (229 m) max. cable length using 18 to 22 AWG twisted pair shielded cable (overall shielded cable for Full-Featured Units), NEC Class 2
Connections Screw terminals
Cover dimensions 3-11/32" H x 2-1/2" W x 1-1/2" D (85 mm x 63 mm x 38 mm)
Color Desert beige or white
Voltage requirement 18 to 35 Vdc
Description Accuracy % Certification Features Product Part Number
RH only 5 Plain Sensing 544-808
RH only 2 Plain Sensing 544-811
RH only 2 Included Plain Sensing 544-812
RH/T 5 Plain Sensing 544-814
RH/T 2 Plain Sensing 544-819
RH/T 2 Included Plain Sensing 544-820
RH/T 5 Full-Featured 544-818
RH/T 2 Full-Featured 544-822
RH/T 2 Included Full-Featured 544-823
Add letter suffix to indicate desired color: A=Desert Beige; B=White (e.g., 544-808A for Desert Beige).
Information in this document is based on specifications believed correct at the time of publication. The right is reserved to make changes as design improvements are introduced. APOGEE is a trademark of Siemens Building Technologies, Inc. 2000 Siemens Building Technologies, Inc.
Siemens Building Technologies, Inc. Landis Division 1000 Deerfield Parkway Buffalo Grove, IL 60089-4513
Printed in the U.S.A. (origin) Page 3 of 3
Accessories Ordering Information
Description Product Part Number
EasyCal Plus Humidity Calibrator 538-897
Single Adapter Base Kit (Beige) 544-782A
Double Adapter Base Kit (White) 544-783B
Double Adapter Base Kit (Beige) 544-783A
Extender Ring Kit (White) 544-785B
Extender Ring Kit (Beige) 544-785A
Non-Conduit Rough-In Kit 544-784
Sensor Power Supply Module (for MBC/RBC applications using the RH/T units) PTX6.4SPS
AI Point Termination Module (for MBC/RBC applications using the RH/T units) PTM6.2U10
AI Point Termination Modules (for MBC/RBC applications using the RH only units) PTM6.2I420