Teledyne 2120XL, Operating Instructions Manual, Page: 40 / 85

Installation Model 2120XL
Teledyne Analytical Instruments 28
Note: Air leaking into the sampling system will cause erratic or
unsatisfactory analyzer operation. Even if air is admitted
into the system for only a few minutes, you must purge the
regulator and the system for at least 1 hour before the
readings stabilize. See Section 3.7.
Whenever a fitting on the sample system is opened, use a
new ferrule and cone or new gasket depending on the type
of fitting to secure a gas tight seal. Each fitting should be
leak checked whenever a connection has been opened or
disturbed in any manner.
All gas connections are made to the 1/8” tube fittings installed on
the rear panel. See Figure 3-2. The connections include:

Sample Gas In

Exhaust Gas Out (Vent)

Instrument Air (optional calibration valves)

Purge Gas (optional calibration valves)

Span Gas In (optional calibration valves)

Zero Gas In (optional calibration valves)
CAUTION: EQUIPMENT DAMAGE MAY RESULT IF THE
ANALYTICAL CELL IN THIS UNIT IS EXPOSED TO
PRESSURE, CAUSING IT TO BREAK OR SHATTER.
TO PREVENT THIS, NEVER EXCEED 20 PSIG (138
KPA) ON THE INLET PORT AND ALWAYS MAINTAIN
THE VENT AT ATMOSPHERIC PRESSURE.
DO NOT BLOCK THE VENT. ANY BACKPRESSURE
ON THE VENT WILL CAUSE DAMAGE TO THE
ANALYTICAL CELL.
To connect the gas line:
1. Connect an unobstructed vent line to the 1/8” (0.32 cm)
Swagelok fitting on the vent port on the rear of the analyzer.
2. Connect the purge gas input to the analyzer at the Purge Inlet.
3. On units equipped with the optional calibration valve,
connect a source of instrument air to the unit. The air supply
must be regulated to 65-70 psig.