Dew point control switches TW - Modbus - T3
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Dew point control switches HYGRASGARD® TW-Modbus-T3

Product group: WG01

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196,17 €
233,44 € incl. VAT + shipping


Dew point control switches HYGRASGARD® TW - Modbus - T3
Patented quality product
(pro-dynamic cross convection patent no. DE 10 2012 015 726.6)

Calibratable dew point control switch HYGRASGARD® TW - Modbus - T3 (compact variant incl. strap) or TW - Modbus - external (detached variant), with Modbus connection, in an impact-resistant plastic housing with quick-locking screws, optionally with/ without display, to exactly detect the relative humidity (0…100% RH) and the temperature (–35...+80 °C) and to detect various parameters in humidity measurement. The dew formation in particular is reliably determined thanks to its patented measuring method, the pro-dynamic cross-convection (no conductivity measurement). International system of units SI (default) can be switched to Imperial (via Modbus).

The surface-contact sensor is applied in a non-aggressive, dust-free environment and is suitable for installation in ceilings, ducts and devices. It is used in the refrigeration, air conditioning and clean room technology, engineering rooms, hotels and conference facilities.

A long-term stable, digital humidity and temperature sensor guarantee exact measurement results. These measurands are used to internally calculate the following parameters that can be retrieved via Modbus: relative humidity, absolute humidity, mixture ratio, dew point, enthalpy (ignoring atmospheric air pressure) and ambient temperature.
Innovative Modbus sensor with galvanically separated RS485-Modbus-interface, selectable bus termination resistance, DIP switch for setting the bus parameters and bus address in curent-free state, internal LEDs for telegram status display, two separate push-in terminals and large three-line display (illuminated; with customised programming in the 7-segment and dot-matrix range). The sensor is factory-calibrated; an environmental precision adjustment by an expert is possible.

Technical details

Voltage supply
24 V AC (± 20 %) and
15…36 V DC
Power consumption
< 1.2 W/ 24 V DC; < 1.8 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)
Electrical connection
0.2 - 1.5 mm², via push-in terminal
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