Teledyne 275R - Portable turbine generator purge gas analyzer - Manual (Page 10)

TELEDYNE ANALYTICAL INSTRUMENTS
3.2
3.0 Operations 3.0 Operations 3.0 Operations 3.0 Operations 3.0 Operations
3.1.6 3.1.6 3.1.6 3.1.6 3.1.6 Analog Meter Analog Meter Analog Meter Analog Meter Analog Meter
The meter has three scales:
• 0-100% H
2
in CO
2
(green).
• 0-100% air in CO
2
background (black).
• 90-100% H
2
in air (red).
The output of the circuitry for the 0-100% H
2
in CO
2
scale is nonlin-
ear with the most sensitive area being at the low end. The other two scales
are almost linear. A special meter dial is provided with markings located to
accommodate these non-linearities so that extrapolation is not required.
3.1.7 3.1.7 3.1.7 3.1.7 3.1.7 Analog Output Analog Output Analog Output Analog Output Analog Output
A 0-1 VDC output is provided. This output is non-linear and must be
interpreted using the curves in the Appendix. The load on this signal must
be less than 10,000
Ω
to ensure that it will not cause error in the output
signal.
3.2 3.2 3.2 3.2 3.2 Start-Up Start-Up Start-Up Start-Up Start-Up
3.2.1 3.2.1 3.2.1 3.2.1 3.2.1 Preliminary Preliminary Preliminary Preliminary Preliminary
1. Check that the inlet and outlet lines have been connected to the
proper ports in the rear of the analyzer, and that all the lines are
leak-free.
2. Plug the power cord in.
3. Turn the analyzer power switch ON. The switch is located on
the lower left-hand corner of the front panel.
4. Allow the analyzer to warm up until the lamp starts flashing.
Allow 15 more minutes of warm-up.
3.2.2 3.2.2 3.2.2 3.2.2 3.2.2 Flowrate Flowrate Flowrate Flowrate Flowrate
The gas flowrate should be approximately 0.1 SCFH 0.1 SCFH 0.1 SCFH 0.1 SCFH 0.1 SCFH, at 10 psi 10 psi 10 psi 10 psi 10 psi pres-
sure.
3.2.3 3.2.3 3.2.3 3.2.3 3.2.3 Calibration Calibration Calibration Calibration Calibration
1. With 100% CO
2
flowing through the cell, adjust the zero
control potentiometer so that the meter reads zero for Range 1
and Range 2 of the analyzer.