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Do not leave the exit tube in water, as there is a risk that moisture will get sucked back into the
sensor and damage it.
5.5.3 Purge safety backup unit
The gas analyzer must be switched on at all times, and purge gas
must be constantly supplied to purge the sensor cell, to prevent
damage to the sensor electronics.
However, in the event of a mains power outage, the 32605 purge
backup unit ensures that the purge gas supply to the TC sensor is
not interrupted at any time. The cycle is slower than usual (around
one minute), for approximately four days.
The green LED is on as long as the battery charge is OK. The red
LED is on when charging is needed. To save batteries, both LEDs
are out when the backup unit is in use, and mains power is out.
5.6 In-line temperature sensor
The in-line temperature sensors give the sample temperature directly from the sample flow, as a
replacement for the temperature sensor installed inside the thermal conductivity sensor.
Use of the in-line temperature sensor is recommended when the environment or sample experience
temperature changes. It provides a direct sample temperature measurement to the instrument, that is
not influenced by the ambient temperature.
The in-line temperature sensor connects to an adapter at the rear of the sensor. When connected,
the in-line temperature signal bypasses the internal temperature sensor signal, and is sent to the
measuring instrument via the thermal conductivity sensor cable as usual. When the in-line
temperature sensor is unplugged, the internal temperature sensor is re-activated.
There are a number of different temperature sensors depending on the specific application
requirements.
5.7 External pressure sensor
The system can be fitted with an external pressure sensor. This enables a measure of fraction of gas
under variable pressure conditions during gas phase measurement.
Two models are available, depending on applied pressure:
• 28117GP Pressure sensor 0–3.5 bar absolute
• 28117C Pressure sensor 0–1 bar absolute
Do NOT exceed the pressure range of the sensor. This would permanently deform the sensor
membrane, thus delivering incorrect pressure values in the future.
The external sensor connects to the ORBISPHERE measuring equipment with a 1 meter cable and a
4 pin connector (an optional extension cable can be used, but total length should not exceed
50 meters).
The external pressure sensor can be installed in the model 32002.xxx multi parameter flow chamber.
It is held in place by a blue threaded collar. Tightness is assured by the O-ring on the sensor seat.
Section 6 Maintenance
6.1 Maintenance schedule
Service includes membrane replacement and external cleaning to restore the original sensor
sensitivity. This means low running costs and down time reduced to a minimum.
C A U T I O N
C A U T I O N
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