Installation
Installation and Operation Manual - ENSITU
®
7000
10 Doc.-ID: ENS_13062019-EN
2.7 Test gas connection / reference air ports
Figure 9 - Overview of test gas connection / reference air ports
Test gas
connection
The test gas connection is equipped with a check valve with
1/4" parker connection for 1 or 2-point calibration purposes.
See chapter 3.6 for the calibration procedure.
If instrument air is available, it should be used for 1-point calibration
purposes:
Test air / test gas flow rate, 150 – 180 l/h
Reference air in /
Reference air out
The reference air ports allow for sufficient supply of ambient air as
reference air to the reference side of the sensor. The ports are
equipped with screw-in aeration membranes to prevent the ingress of
water or dust.
Alternatively, should the ambient air be contaminated with exhaust
fumes or have a high humidity which could influence the O
2
measurement, one of the ports can be used for the connection of
instrument air (according to ISO 8573-1 class 2) as reference air (in
this case instrument air should also be used as test air).
The second unused port acts as reference air outlet.
The following must be noted in this case:
The screw-in aeration membrane must be removed from the
port where the instrument air is connected.
Instrument air flow rate, 15 - 20 l/h
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