2
* Setting internal parameters.
Next to the adjustment of the setpoint, some internal settings are possible like differential, sensor-
offset, setpoint range and the function cooling or heating.
By pushing the
DOWN
key more than 10 seconds, you enter the 'internal programming menu'. In the
left display the upper and lower segment are blinking. Over the
UP
and
DOWN
keys the required
parameter can be selected (see table for the parameters).
If the required parameter is selected, the value can be read-out by pushing the
SET
key. Pushing the
UP
or
DOWN
keys together with the
SET
key allows you to change the value of this parameter.
If after 20 seconds no key is pushed, the
ALFA 31
changes to its normal operation mode.
* Adjustment sensor.
The sensor can be adjusted by using the Sensor Offset (parameter 04). Indicates the
ALFA 31
e.g.
2°C too much, the Sensor Offset has to de decreased by 2°C.
* Error messages.
In the display of the
ALFA 31
the following error messages can appear:
Er
- Sensor broken. Solution:
- Check if the sensor is connected correctly.
- Check the sensor (1000
Ω at 25°C).
- Replace the sensor.
EE
- Settings are lost. Solution:
- Reprogramme the settings.
* Technical details.
Model
: ALFA 31
Range
: -50/+50°C, readout per 1°C
Supply
: 230 Vac (or 24Vdc or 12Vdc)
Relay
: SPDT 250V/16A(C-NO), 8A(C-NC) (cos phi=1)
Control
: by pushbuttons on the front.
Front
: Polycarbonate IP65
Sensor
: SM 811/2m (1000
Ω at 25°C)
Sizes
: 35 x 77 x 71,5mm (hwd)
Panel hole
: 28 x 70mm (hw)
- Provided with memory protection during power failure.
- Connection with screw terminals on the back side.
- Equipped with self test function and sensor failure detection.
- Special version are available upon request.
