Dew point control switch TW - Modbus
temperature Luftfeuchtigkeit

Dew point control switch HYGRASGARD® TW-Modbus

Product group: WG01

In Stock

Usually ships in 1 to 3 days
190,46 €
226,65 € incl. VAT + shipping


Dew point control switch HYGRASGARD® TW - Modbus
Quality product for the HVAC sector, accuracy ±2%
Calibratable HYGRASGARD® TW - Modbus dew point control switch incl. strap, with detached sensor head, Modbus connection, terminal box housing made of impact resistant plastic, housing cover with quick-locking screws, with/without optional display.
The universal surface-contact sensor serves to detect various parametres in humidity measuring. Measurands include relative humidity and ambient air temperature. These measurands are used to calculate various parametres internally. The following parametres can be retrieved via Modbus: relative humidity [%r.H.], absolute humidity [g/m³], mixture ratio [g/kg], dew-point temperature [°C], enthalpy [kJ/kg] (ignoring atmospheric air pressure) and ambient temperature [°C].
The control switch is used in non-aggressive, dust-free environments, in refrigeration, air conditioning and cleanroom engineering, hotels, engineering rooms, meeting and conference facilities. The measuring transducers provide precise detection of temperature and humidity. A digital, long-term stable sensor is used as a measuring element for humidity and temperature. Fine adjustment by the user is possible. The sensor is suitable for ceiling and duct installation or for integration in equipment.

Technical details

Voltage supply
24 V AC (± 20 %) and
15…36 V DC
Power consumption
< 1,0 W/ 24 V DC
< 2,2 VA/ 24 V AC
Data points
Temperature [°C], relative humidity [% RH],
dew point [°C], absolute humidity [g / m3],
mixture ratio [g / kg], enthalpy [kJ / kg]
Deviation of humidity
typical ± 2.0 % (20…80 % RH); at + 25 °C, otherwise ± 3.0 %

Temperature deviation
typically ± 0.2 K at +25 °C
digital humidity sensor
with integrated temperature sensor,
low hysteresis, high long-term stability
Sensor protection
membrane filter
Measuring range
0...100 % RH (humidity)
-35...+80 °C (temperature)
Measuring ranges
–35...+80 °C
0...100 % RH
Zero point offset
± 10 % RH (humidity)
± 5 °C (temperature)
Ambient temperature
–30...+70 °C
clean air and
non-aggressive, non-combustible gases
Bus protocol
Modbus (RTU mode),
address range 0...247 selectable
Signal filtering
4 s / 32 s
Process connection
endless metal strap with metal tightener,
300 mm, for pipes up to 3 ''
(included in scope of delivery)
Cable gland
2x M 12 x 1.5 (Y-adapter); with strain relief,
exchangeable, max. inner diameter 6 mm
Permissible air humidity
< 95 % RH, non-precipitating air
Protection class
III (according to EN 60 730)
Protection type
IP 65 (according to EN 60 529)*
Protection type housing
IP 65
CE conformity
according to EMC Directive 2014/ 30/ EU,
according to EN 61 326
Y-adapter for cable gland M16 x1.5 (on 2x M12 x1.5),
plastic (included in the scope of delivery)