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P29 Instruction Manual
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3.2 Maintenance, repair
Maintenance and repair work may only be performed by trained professionals and
on behalf of the operator of the plant.
The following steps must be performed before beginning maintenance work:

Separate the instrument from the electrical power supply.

Close gas supply lines.

Detach the gas supply lines.

Open the instrument.

Detach electrical connections.

Remove the instrument.

Flush the switched-off pressure system for at least 2 minutes with air
(P = 100…1000mbar) to remove the gas.

Install and start-up the new instrument as described in Section 3.1.
3.3 Leak Test
If necessary, the user can carry out regular leak tests as a simple pressure test.
For the leak test, shut off the two pressure lines to the P29 and note the initial pressure (display
or output signal). Observe the differential pressure for 1 minute. The differential pressure must
not drop over this period. Please note that strong temperature fluctuations in the confined
volume can also lead to changes in pressure.
3.4 Shipping
Instruments operated with natural gas can still contain remnants of these gas. These
must be flushed out before packaging.
To ensure that there are no more gas residues in the device, once the device has been
installed in a system that works with natural gas, it must be switched off for
at least 2 minutes
and connected to the plus or minus pressure connection with air (P = 100…1000mbar)
in order to remove all traces of the gas. This is particularly important if several instruments are
to be shipped in the same box.