Datasheet

Electronic duct hygrostat and/or duct thermostat HYGRASREG
®
KHT-30 with a continuous and two switching outputs, adjustable switching
thresholds and display for indicating ACTUAL humidity and/or ACTUAL temperature (accuracy class ± 3 % 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 KHT-30 uses a digital, long-term stable sensor as a measuring element. It is used in
dust-free, unpolluted, non-aggressive air.
TECHNICAL DATA
Power supply: 24 V AC ⁄ DC (± 20 %)
Power consumption: < 1,5 VA ⁄ 24 V DC , < 3,5 VA ⁄ 24 V AC
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)
Setting range: 5...95 % r.H. (humidity)
Multi-range switching with 4 switchable measuring ranges (see table)
–35...+35 °C; –35...+75 °C; 0...+50 °C; 0...+80 °C (temperature)
(Switch steps 1 and 2 are separately adjustable)
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)
Output: potential-free changeover contacts (2 x changeover contact 24 V, 1A ohmic load, separately adjustable,
2x 0 - 10V for U variant or 4...20mA for I variant)
Deviation, humidity:
± 3 % r. H. (20…80 %); at + 20 °C, otherwise ± 5 % r. H.; ± 0,2 K at +25 °C
Ambient temperature: storage –35...+85 °C; operation – 30...+75 °C, non-precipitating
Long-term stability: ± 1 % per year
Enclosure: plastic, material polyamide, 30 % glass-globe-reinforced, with quick-locking screws (slotted ⁄ Phillips head
combination), colour traffic white (similar to RAL 9016), enclosure cover for display is transparent!
Enclosure dimensions: 126 x 90 x 50 mm (Tyr 2)
Cable gland: M 16 x 1.5; including strain relief, exchangeable, max. inner diameter 10.4 mm
Protective tube:
PLEUROFORM
TM
, material polyamide (PA6), with torsion protection, Ø 20 mm, NL = 235 mm, v
max
= 30 m/s (air)
(optional available on request stainless steel, Ø 16 mm)
Protection class: III (according to EN 60 730)
Protection type: IP 65 (according to EN 60 529) enclosure only!
Electrical connection: 0.14 - 1.5 mm
2
, via terminal screws
Standards: CE conformity, EMC directive 2014 ⁄ 30 ⁄ EU
Display: three-line
display with illuminatio n, 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.
2nd 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 / terminal 3: output temperature
Dehumidifying/cooling:
1st step: wire contacts 11 - 13. When actual humidity exceeds switching threshold S1,
the changeover contact switches to 11 - 13.
2nd 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 / terminal 3: output temperature
HYGRASREG
®
KHT - 30 – Duct hygrostat and humidity and temperature sensor (± 3 %), Delu xe
Type ⁄ WG02 Setting Range
Humidity Temperature
Output Steps Display Item No.
KHT - 30 - I I - variant
KHT-30W-I TYR2 5...95 % r. H. –35...+75 °C
–35...+35 °C
0...+50 °C
0...+80 °C
2 x changeover
contact,
2x 4...20 mA
two-step ■ 1202-8127-2421-000
KHT - 30 - U U - variant
KHT-30W-U TYR2 5...95 % r. H. –35...+75 °C
–35...+35 °C
0...+50 °C
0...+80 °C
2 x changeover
contact,
2x 0 -10 V
two-step ■ 1202-8127-1421-000
G
HYGRASREG
®
KHT - 30 Rev. 2017 - V21 GB