74 AO2000-LS25 LASER ANALYZERS | OI/AO2000-LS25-EN REV. D
… 13 Maintenance
Introduction
The analyzer is designed to reduce the maintenance required to
a minimum.
Experience has shown that maintenance interval of more than
three months are acceptable for most applications.
The maintenance operations described in this section will secure
a continuous and safe operation of the monitor.
a
Maintenance plan
ABB gas monitors have no moving parts and require no
consumables.
For best performance, however, routinely carrying out the
follows steps is recommended:
• Check optical transmission regularly (daily). This can be
done automatically by use of instrument output (if
ordered).
• Clean windows and adjust alignment when necessary, see
Cleaning of optical windows on page 75.
• For applications whose concentration of the sample gas
is usually zero (“zero point gas” application):
– Check the device reaction by supplying a sample gas.
Ensure that a sufficient amount or concentration is
applied in order to detect a device reaction or
measured value change for at least 10 minutes.
– No warnings or errors should be displayed during the
test.
– For certain devices this procedure is not necessary as
the laser is tracking on another absorption line than
the “zero gas” line (e.g. H
2
O line for an HF device).
Contact ABB Service if you are in doubt about your
device.
• Check calibration every 3 to 12 months (depending on the
required accuracy). Recalibrate if necessary, see
Calibration of the device on page 76.
• After each calibration check, save device settings and
measurement data recorded with some gas, see File
download / upload <File download / upload> on
page 65.
This is for tracking purposes in case of future service
issues.
Carry out maintenance activities
Opening and closing the housing
This housing contains a 3 V lithium battery.
Observe the following safety instructions when opening and
closing the housing with the type of protection Ex “p” –
pressurized enclosure:
Explosion hazard
There is a risk of explosion if the housing is opened in a
hazardous atmosphere.
Before opening the housing:
• A valid fire permit must be present.
• Make sure that there is no explosion hazard.
• Before opening the housing, switch off the power supply.
Risk of suffocation
Risk of suffocation when using inert purging gases such as
nitrogen (N
2
).
• Before opening the housing, switch off the housing
Recommissioning after opening the housing
• Before closing the housing and recommissioning, all dust
deposits in and on the device must be removed.
• After closing the housing, the power supply must not be
restored until an initial purge duration of at least 3 minutes
at 20 l/min has elapsed.
Only original spare parts must be used to seal the housing.
Replacement of the lithium battery
The lithium battery may only be replaced by ABB Service.
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