Performing A Calibration; Setting The Sensitivity Of The Sensor - Grundfos Conex DIA-G Montage- Und Betriebsanleitung

11.11.1 Manually setting the zero point for the
sensors
Warning
If this function is used incorrectly, there is
a risk of measuring faults or measurement
failure!
The sensors may indicate a deviation from the zero
point, i.e. a concentration is indicated even though
there is no gas in the air. To compensate this value,
a zero point deviation of up to 5 µA can be corrected.
In the event of greater deviations, the sensor is
defective and must be replaced.
To set the zero point for the sensor:
• Place the sensor in an environment containing
absolutely no measured gas.
Warning
Never set the zero point in the room that is
to be monitored by the sensor! Any gas
concentration in this environment will be
subtracted from the measured value in
future as the offset!
In the "Sensor 1"/"Sensor 2" submenu, the zero point
can be set manually.
• Man. zero pt. S1 / S2
– Change
– Delete.
The "Change" option can be used to enter a new
zero point.
– 0.00 ppm = x.xx µA or nA.
The "Delete" option deletes a previously set zero
point. The value pair is reset to 0.00 ppm/0 µA or nA.

11.11.2 Performing a calibration

Warning
If this function is used incorrectly, there is
a risk of measuring faults or measurement
failure!
The sensors may indicate a deviation from the actual
gas level in the air. To compensate for this deviation,
the sensor can be calibrated. To do this, a precise
comparative measurement is absolutely essential
(for example calibrated gas measuring device).
48
®
The Conex DIA-G is a gas detector. It is
Note
not suitable for continuous measuring of a
gas concentration or for MAC monitoring.
In the "Sensor 1"/"Sensor 2" submenu, the
calibration can be performed.
1. Transfer the sensor to an atmosphere containing
gas, and carry out a concentration measurement
with a gas measuring device.
• Calibration S1/S2
– Measured value
– Result.
The "Measured value" option can be used to perform
the calibration.
2. Press the [Up] or [Down] button to enter the
concentration of the comparative measurement
in ppm.
– The row below displays the actual current of
the cell in nA or µA.
Calibration
x.xx ppm
Cell 22.2 µA
3. Press [OK] to save the calibration.
– The calibrated increase is displayed in the
"Result" menu.
– The increase is also transferred to the sensor
data in the "Service" menu.

11.11.3 Setting the sensitivity of the sensor

Warning
If this function is used incorrectly, there is
a risk of measuring faults or measurement
failure!
In the "Sensor 1"/"Sensor 2" submenu, the sensitivity
can be entered manually.
• Sensitivity S1/S2
– Press the [Up] or [Down] button to enter the
sensor sensitivity in nA/ppm or µA/ppm.
– Save using [OK].