Michell Instruments XZR500ST, User Manual

Page: 38 / 78

XZR500 User’s Manual
30 97137 Issue 8, April 2017
OPERATION
3.3.3.3 Calibration Procedure
Follow Sections 3.3.3.1 and 3.3.3.2 to connect the calibration gas to the analyzer (8%
oxygen bottle, if 1G or 2G is ordered). Do not switch on the calibration gas fl ow at this
time.
Your selection?
Visu * Cal + Set -
1. From the main page, press and hold the
[*] (Enter key) until the main selection
menu appears.
Test gas value
8.00
2. Press the [+] key from the main selection
menu to enter the calibration mode. The
fi rst page displays the ‘Test gas value’.
Make sure that the displayed value is the
same as the calibration gas.
NOTE: This value is in %. For
example, 8.00 equals 8%.
If the displayed value is not the same value
as the calibration gas, exit the calibration
mode from next page (‘Inject gas’) and
then go to ‘Test gas value’ under ‘Set-
up menu’ Access code 0.12 to adjust it.
(Please refer to details in Section 3.3.2.1)
Press the [*] (Enter key) to move to the
next page.
Inject gas
Yes* No -
3. This page shows the calibration start
command.
[*] – Starts the calibration process (go to
step 4)
[–] key – Cancels the calibration process
and exits the calibration mode. If the ‘Test
gas value’ needs to be modi fi ed, then go
to ‘Test gas value’ under ‘Set-up menu’
Access code 0.12 to adjust it.
NOTE: Once the calibration process
starts (after pressing the [*] key),
the 4-20 mA output will be frozen
from this step until the end of the
purge procedure and will show the
last measured value.
4. Open the test gas cylinder to introduce
the gas into the analyzer. Adjust the fl ow
to the recommended level of 7 l/hour (±2
l/hour) and ensure that the fl ow is stable.
Higher or lower fl ow rates could affect
the accuracy of the calibration as well as
further measurements.