Calibration -> Please enter code -> Calibrate sensor -> Select sensor -> H
2
S sensor.
8241
Cal after install
Start zero cal.
Start MR cal.
Input TC parameters
The adjacent display appears.
You can now adjust the H
2
S sensor as described in the following
sections. The following sequence must be observed when cali‐
brating 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 deection 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 dened
concentration of hydrogen sulde. We recommend monthly calibration with a calibration gas to
keep potential measurement uncertainty within strict limits: The hydrogen sulde
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.
8.2.4.1 Calibration: H2S sensor: Dening the installation
You have to re-enter the date of installation after installing a new sensor.
H2S Cal after inst.
Date :DD/MM/YYYY
82411
The adjacent display appears when you select the 'Installation
date' menu item:
Now you can enter the date of installation in the form:
'DD.MM.YYYY'.
Note
Prior to entering the installation date, you must perform a zero point and measuring range
calibration of the H
2
S sensor, otherwise the new date will not be accepted.
8.2.4.2 Calibration: H2S sensor: Calibrating the zero point
You can use this function to re-adjust the zero point of the H
2
S sensor. As the zero gas you can
use:
• Nitrogen
or
• air free of H
2
S.
Functions
8.2 Calibration
ULTRAMAT 23
Equipment Manual, 04/2022, A5E37100388-012 121
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