Teledyne 4020 – Hydrocarbon analyzer (special version for automatic background gas switching) - Manual (Page 49)

Total Hydrocarbon Analyzer Operation
Teledyne Analytical Instruments 31
2. Allow at least 2 hours warm-up (heat up sensor & sample
system) after making the air adjustment described below. Warm
up time is set by the software at the factory.
DO NOT attempt to ignite the flame during warm up
countdown. Condensation will occur.
4.4 Activating the Support Gases
4.4.1 Air
1. Set the air tank regulator to 30 psig.
2. Adjust the instrument air regulator until the air pressure
gauge reads the recommended air pressure.
After the air is flowing through the sensor and warm-up time has
been completed, activate the following gases:
4.4.2 Sample Gas
Set the sample gas tank regulator to 30 psig (or a pressure which
matches the sample pressure) and adjust the instrument sample
regulator until its (sample) pressure gauge reads the recommended
sample pressure.
4.4.3 Span Gas
1. Feed span gas to the analyzer. This instrument has an automatic
valve selection feature for directing sample or calibration gas to
the analyzer. See Section 4.6.16 for setup and operation of the
valve selection feature..
2. Set the span gas regulator to 30 psig or to match the sample
pressure.
3. Observe that the instrument sample pressure gauge still reads the
recommended sample pressure and that the bypass flowmeter
reads from 0.5 to 1.0 SCFH.
4.4.4 Fuel
1. Open the main valve on the tank and set the fuel tank pressure
regulator to 30 psig (or to match sample pressure).