Stable indoor climate data helps keep HVAC, BEMS and controlled environments running with confidence. HD48 transmitters measure relative humidity, temperature and calculated dew point, making them suitable for ventilation ducts, cleanrooms, museums, pharmacies, greenhouses, farms and industrial or civil buildings.
The series adapts to different installation points without changing the measurement concept. Choose vertical wall probes, horizontal duct probes or remote probes with 2, 5 or 10 m cable, plus 135 mm or 335 mm stem lengths where applicable. Standard versions cover -20...+80 °C, while selected horizontal and cable probe versions extend to -40...+150 °C.
Integration is straightforward in both analog and digital systems. HD48 versions offer active 4...20 mA, 0...10 Vdc or RS485 Modbus-RTU output, with optional 4-digit LCD display and factory calibration for immediate use. The IP65 ABS housing and protected probe filters support reliable operation with low routine maintenance.
Models are available for relative humidity, temperature, relative humidity with temperature, or dew point with temperature.
The series includes fixed vertical wall probes, fixed horizontal duct probes and cable probes with M16 connector.
Relative humidity is measured with a capacitive sensor, while temperature is measured with NTC or Pt100 depending on version.
Versions with 4-digit LCD display can show one measured parameter or alternate two parameters in sequence.
HD48S models use Modbus-RTU and include configurable address, baud rate, parity and stop bit settings.
HD4817CAL software supports analog range scaling, serial communication settings, display mode, temperature unit and RH calibration.
Code: HD48 [1] [2] [3] [4] [5]
Example: HD48S17ETC1.2L
[1] Output
Blank = analog output 4…20 mA
V = analog output 0…10 Vdc
S = RS485 MODBUS-RTU output only
Note: the models with analog output have an output for each measured quantity.
[2] Measured quantities
01 = Relative Humidity
07 = Temperature
17 = Temperature and Relative Humidity
77 = Temperature and Dew Point
[3] Temperature measuring range
Blank = standard range –20…+80 °C
E = extended range –40…+150 °C (not possible with “TV” and “77” models)
[4] Probe type
TV = vertical fixed probe (not possible with “77” models)
TO1 = horizontal fixed probe, stem 135 mm
TO2 = horizontal fixed probe, stem 335 mm
TC1.2 = probe with 2 m cable, stem 135 mm
TC1.5 = probe with 5 m cable, stem 135 mm
TC1.10 = probe with 10 m cable, stem 135 mm
TC2.2 = probe with 2 m cable, stem 335 mm
TC2.5 = probe with 5 m cable, stem 335 mm
TC2.10 = probe with 10 m cable, stem 335 mm
[5] Display
Blank = without display
L = with LCD display
