Siemens ULTRAMAT 23, Руководство пользователя, Страница: 118 / 244

Functions
8.2 Calibration
ULTRAMAT 23
118
Manual, 3/2016, A5E37100388-003
Adjust setpoint
You can use this function to adjust the setpoint of the calibration gas for calibration of the
measuring range.
If the adjacent display appears, adjust the setpoint as follows:
Position the cursor at the beginning of the 2nd line (Setpoint)
and press the <ENTER> key.
The adjacent display appears.
• Now enter the desired setpoint using the arrow keys, and
then press the <ENTER> key.
•
Exit the menu by pressing the <ESC> key.
8.2.5 Calibration: H2S sensor
You first need to select the H
2
S sensor in order to adjust it. To do this, navigate in the
operator menu as follows:
Calibration -> Please enter code -> Calibrate sensor -> Select sensor -> H
2
S sensor.
The adjacent display appears.
You can now adjust the H
2
S sensor as described in the follow-
ing sections. The following sequence must be observed when
calibrating the sensor:
1.
Enter correction factors for temperature compensation of
zero point
2. Enter correction factors for temperature compensation of
sensitivity
3. Caibrate zero point of the H
2
S sensor
4. Caibrate measuring range of the H
2
S sensor
5. Enter installation date.
Steps 1, 2 and 5 are only carried out following installation of a new sensor.
The deflection signal of the sensor is subject to drift. This drift can only be detected through
regular checking and corrected as necessary. This involves using a calibration gas with a
defined concentration of hydrogen sulfide. We recommend monthly calibration with a
calibration gas to keep potential measurement uncertainty within strict limits: The hydrogen
sulfide concentration of this calibration gas should correspond to the concentration of the
sample gas, having a concentration of at least 10% of the largest full-scale value.