ABB ACF-NT, Operator'S Manual

Page: 23 / 42

42/23-572 EN Rev. 5 Operator’s Manual ACF-NT, ACF-NT V0309 23
Seal Integrity Check
When is the seal
integrity check
needed? The seal integrity check must be performed regularly.
The seal integrity check methods differ depending on whether a VOC analyzer
(MultiFID14) is installed in the analyzer system.
The seal integrity check can be performed easily using a lighter when a VOC
analyzer (MultiFID14) is installed in the analyzer system.
Let the butane of the lighter stream (do not ignite!) against all fittings, connections
and screws for a short time (max. 1–2 seconds).

Start at the probe and proceed to the analyzer cabinet.

Open the SC block insulation.
CAUTION!
The SC block is hot (approx. 180 °C)!
Analyzer System
with VOC Analyzer
(MultiFID14)

Test the sample gas line connection to the SC block as well as the connections
to and from the cell and also towards the SC block.
If there is even a small leak the measured values of the FID will increase
immediately and will decrease relative fast to normal measurement values.
Do not let stream the gas from the lighter too long to the connections especially
when testing the SC block. This would result in a “cloud” of hydrocarbons and
because of the short distances it would be difficult to decide which connection has
the leak.
The seal integrity check of the SC block should be performed using a U-tube
manometer when no VOC analyzer (MultiFID14) is installed in the analyzer system.
Interrupt the sample gas supply.

Close all inputs and outputs at the SC block, also the instrument air connections.
CAUTION!
The SC block is hot (approx. 180 °C)!
Analyzer System
without VOC Analyzer
(MultiFID14)

Disconnect the sample gas line from the SC block and connect a tee fitted with
a shut-off valve.

Connect a U-tube manometer half filled with water to the free end of the tee.

Blow air or nitrogen through the shutoff valve to a gauge pressure of p
e

50 hPa
(= 500 mm water column).

Close the shut-off valve. The pressure should not change measurably in
3 minutes (pressure drop

3 hPa). A sharp pressure drop is a sign of a leak.