Multi-funtional duct sensor

Multi-functional duct sensor for monitoring and control of heating, ventilation and air-conditioning systems

PREMASGARD® 814x-Modbus

Efficient, convenient and network-enabled

Elegant appearance, touch-operated interface, large display, and Modbus-compatible


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Good room climate is measurable!

Active and Modbus capable room sensors for temperature, humidity and CO2 now also for in-wall installation!


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Item No. 1202-7127-2421-000
EAN 4 251325 611839

Electronic room hygrostat and/or room thermostat HYGRASREG® RHT-30 with one continuous and two switching outputs, adjustable switching thresholds, with/ without optional display for indicating ACTUAL humidity and/or ACTUAL temperature (accuracy class ± 2.0 % r.H.). The setpoints can be allocated to the relative humidity and/or to the temperature. It is suitable for regulating and monitoring relative humidity (humidifying and dehumidifying) and/or the temperature (heating and cooling), e.g. in ventilation and air conditioning ducts, laboratories, production facilities, climatic test cabinets, indoor swimming pools, greenhouses, etc., to control humidifying and dehumidifying equipment or heating system control. The measuring transducers are designed for exact humidity/temperature measurement. The RHT-30 uses a digital, long-term stable sensor as a measuring element. It is used in dust-free, unpolluted, non-aggressive air.

198,90 € net
Voltage supply 24 V AC/ DC (± 20 %)
Power consumption < 1.5 VA/ 24 V DC, < 3.5 VA/ 24 V AC
Deviation of humidity typical ± 2.0 % r. H. (20…80 % r. H. ); at + 25 °C, otherwise ± 3.0 % r. H.
Temperature deviation typically ± 0.4 K at +25 °C
Output potential-free changeover contacts
(2 x changeover contact 24 V, 1A ohmic load, separately adjustable,
2x 4...20 mA for I variant)
Sensor digital humidity sensor
with integrated temperature sensor,

low hysteresis, high long-term stability
Sensor protection plastic sinter filter, Ø 16 mm, L = 35 mm, exchangeable
(optional metal sinter filter, Ø 16 mm, L = 32 mm)
Operating difference Mode 1: both switch steps are freely adjustable (rel. humidity)
Mode 2: 5 % between both switch steps (rel. humidity)
Mode 3: both switch steps freely adjustable (temperature)
Mode 4: switch step 1 (temperature), switch step 2 (rel. humidity)
(adjustable via DiP switches)
Setting range 5...95 % r.H. (humidity)
Multi-range switching with
4 switchable measuring ranges
–35...+35 °C; –35...+75 °C; 0...+50 °C; 0...+80 °C (temperature)
(Switch steps 1 and 2 are separately adjustable)
Ambient temperature storage –35...+85 °C;
operation – 30...+75 °C, non-precipitating
Protective tube stainless steel V2A (1.4301), Ø 16 mm, NL = 55 mm
Electrical connection 0.14 - 1.5 mm² via terminal screws
Housing plastic, UV-stabilised,
material polyamide, 30 % glass-globe reinforced,
with quick-locking screws
(slotted/ Phillips head - combination),
colour traffic white (similar to RAL 9016),
housing cover for display is transparent !
Housing dimensions 126 x 90 x 50 mm (Tyr 2)
Cable gland 2x M 12 x 1.5 (Y-adapter); with strain relief,
exchangeable, max. inner diameter 6 mm
Long-term stability ± 1 %/ year
Protection class III (according to EN 60 730)
Protection type IP 65 (according to EN 60 529) housing only!
Standards CE conformity, EMC directive 2014/ 30/ EU
Display three-line display with illumination, cutout approx. 70 x 40 mm (W x H),
for displaying ACTUAL humidity and/or ACTUAL temperature
or for setpoint adjustment
Function Humidifying/heating:

1st step: wire contacts 11 - 12.
If actual humidity falls more than 3 % r.H. / 1 K (hysteresis) below
switching threshold S1, the changeover contact switches to 11 - 12.

2. step: wire contacts 21 - 22.
If actual humidity falls more than 3 % r.H. / 1 K (hysteresis) below
switching threshold S2, the changeover contact switches to 21 - 22.
Terminal 2: output relative humidity / temperature


1st step: wire contacts 11 - 13.
When actual humidity exceeds switching threshold S1,
the changeover contact switches to 11 - 13.

2. step: wire contacts 21 - 23.
When actual humidity exceeds switching threshold S 2,
the changeover contact switches to 21 - 23.
Terminal 2: output relative humidity / temperature

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