Switching
output
AHT - 30
Mode 1:
Independent switchpoints for both relay outputs can be defined in the range of 5...95 % r.H. by the control knobs (setpoint 1 for relay 1,
setpoint 2 for relay 2, see schematic diagram). When the respective switchpoint is exceeded, the corresponding relay switches over (changeover
contact 1 switches from position 2 to position 3). When the pre-set switchpoint is undershot again by more than 3 % r.H. (hysteresis), the respective
switching output switches back to the initial position (changeover contact 1 switches from position 3 to position 2).
Mode 2:
In Mode 2, only control knob setpoint 1 is active (setpoint 2 without function)! The switchpoint for the first relay is defined in the range of
5...95 % r.H. by the control knob setpoint 1 (see schematic diagram). The switchpoint for the second relay output is invariably defined in mode 2
as "Switchpoint 1 + 5 % r.H.". Hysteresis of 3 % r.H. is also predefined for each switching output in mode 2.
Mode 3:
Independent switchpoints within the temperature range (selectable via DIP switches) for both relay outputs can be defined by the control knobs
(setpoint 1 for relay 1, setpoint 2 for relay 2). If the respective switchpoint is exceeded, the corresponding relay switches over. If the pre-set threshold
value is undershot again by 1 K (hysteresis), the respective switching output switches back to the initial position. The thresholds of the setting range
(temperature) are 5 °C above the minimum or below the maximum range value respectively.
Mode 4:
In mode 4, the control knob is allocated to setpoint 1 of the temperature, while control knob is allocated to setpoint 2 of the relative
humidity. The switchpoints can be set within the temperature range (selectable via DIP switches) or from 5...95 % r.H. (humidity). The thresholds
of the setting range (temperature) are 5 °C above the minimum or below the maximum range value respectively.
Display readout
The
1st line
of the display shows the
ACTUAL humidity
in % r.H. and the
ACTUAL temperature
in °C. The displays showing the ACTUAL values alternate
in a 3-second rhythm. The resolution is 1/10 % r.H. or 1/10 °C.
The
3rd line
shows information about the
switching status of relay 1 and 2
(as circuits) on the left, and on the right for the
switching values of relay 1 and 2
in % r.H. or °C (adjustable via the corresponding set potentio meter).
The reference to respective measured value (relative humidity or temperature)
is determined by the mode selected.
For improved legibility, backlighting is provided.
Zero point calibration
The sensors are pre-set and calibrated at the factory. Adjustment is possible either
for temperature or relative humidity, depending on the output allocation (DIP switch 3).
Range of adjustment: approx. ± 10 % r.H. or ± 5 K.
Supply
AC
DC
→ 1
24 V∼
24 V DC
→ 4
0 V
GND
12
(A1) →
Relay 1
Breaker contact
11
(W1) →
Relay 1
Changeover contact
13
(B1) →
Relay 1
Normally open contact
22
(A2) →
Relay 2
Breaker contact
21
(W2) →
Relay 2
Changeover contact
23
(B2) →
Relay 2
Normally open contact
DIP switches
AHT
- 30
Function mode
DIP 1 DIP 2
Mode 1
(
2x
5...95 % r.H.) (default)
OFF
OFF
Mode 2
(5...95 % r.H.
+ 5 %
r.H.)
O N
OFF
Mode 3
(
2x
–35...+80 °C)
OFF
O N
Mode 4
(5...95 % r.H. / –35...+80 °C)
O N
O N
Temperature range
DIP 3 DIP 4
–35...+35 °C
OFF
OFF
0...+80 °C
O N
OFF
0...+50 °C (default)
OFF
O N
–35...+75 °C
O N
O N
Relay 2 switching value
Relay 1 switching value
Relay 2 switching status (
●
⁄
○)
Relay 1 switching status (
●
⁄
○)
○
Circuit, empty
=
relay in idle state
●
Circuit, full
=
relay energised
G
Installation and Commissioning
Rev. 2020 - V25
11
12 13
11
12 13
Gone below
preset
switchpoint
threshold
Preset
switchpoint
threshold
exeeded
Falls below
the preset value with
3% r.H./1K hysteresis
Exceeding
the preset value
Hysteresis
3% r.H./1K
Switching output 1
°C / % r.H.
21
22 23
21
22 23
Gone below
preset
switchpoint
threshold
Preset
switchpoint
threshold
exeeded
Falls below
the preset value with
3% r.H./1K hysteresis
Exceeding
the preset value
Hysteresis
3% r.H./1K
Switching output 2
°C / % r.H.
