Teledyne 4020 – Hydrocarbon analyzer (special version for automatic background gas switching) - Manual (Page 34)

Installation Model 4020
Teledyne Analytical Instruments 16
switching equipment for delivering the correct
sample/background gas combination to the analyzer.
3.3.2.1 V ENT C ONNECTIONS
Two separate vent connections may be required on your instrument:
 Sensor Vent
 Bypass Vent
Sensor vent and sample bypass vent must run separately.
The sample and bypass vent lines should not be tied together outside
of the system enclosure and the lines need to be installed at a downward
sloping angle to prevent a potential build-up of condensing water vapor
in the vent lines. Follow the installation guidelines below.
Sensor Vent:
All the gases introduced into the detection cell are vented from a
single fitting labeled SENSOR VENT at the rear of the analyzer.
1. TAI recommends that the cell be permitted to vent directly to
atmosphere wherever possible.
2. If the vent line is required, the installation must include a
drop-out pot to collect any water that is formed by the
burning of the hydrogen fuel.
3. The vent line must be constructed so that the water and dirt
cannot collect in it.
4. Sensor vent line must slope downward so condensed water
will freely drain.
SAMPLE BYPASS VENT:
The sample bypassed by the back-pressure regulation system vents
from a separate port labeled BYPASS VENT at the rear of the analyzer.
If this vent is required, it must be installed so that water and dirt
cannot accumulate in it.