Getting Started Model 360E Instruction Manual

3.1.3.3. Pneumatic Connections to M360E in Multipoint Calibration Applications

Some applications may require multipoint calibration checks where span gas of several different concentrations
is needed. We recommend using high-concentration, certified, calibration gas supplied to the analyzer through a
Gas Dilution Calibrator such as a Teledyne Instruments Model 700. This type of calibrator precisely mixes Span
Gas and Zero Air to produce any concentration level between 0 ppm and the concentration of the calibrated gas.
Figure 3-12 depicts the pneumatic set up in this sort of application of a Model 360E CO2 Analyzer with
zero/span/shutoff valve option 50 installed (a common configuration for this type of application).
Source of
SAMPLE GAS
Removed during
calibration
MODEL 701
Zero Gas
Generator
Calibrated
CO2Gas
at span gas
concentration
VENT here if input
is pressurized
MODEL
X00E
PRESSURE SPAN
IZS
PURGE LINE
SAMPLE
EXHAUST
VENT SPAN
Indicating
Soda Lime
Model 700 gas
Dilution
Calibrator
External
Zero Air
Scrubber
Gas Pressure
Should be
Regulated at
30 –35 psig
Figure 3-12: Example of Pneumatic Set up for Multipoint Calibration of M360
3.1.4. Setting the internal Purge Air Pressure.
In order to maintain proper purge air flow though the GFC wheel hosing a manually adjustable pressure
regulator is provided (see Figures 3-3 and 3-5). This regulator includes two output ports. One is used to supply
purge air to the GFC wheel. The other may be used to attach a pressure gauge.
To adjust the internal purge air pressure of the M360E:
1. Turn off the instrument.
2. Remove the source of zero air attached to the purge line inlet port at the back of the analyzer.
3. Remove the analyzer’s the top cover.
4. Remove the cap from the second, unused, output port on the pressure regulator.
5. Attach a pressure gauge capable of measuring in the 5-10 psig range with 0.5 psig resolution to the port.
6. Turn the instrument on.
7. Make sure the zero air supply to the analyzer’s purge line inlet is supplying gas at a stable pressure
above 7.5 psig.
8. Adjust the M360E’s pressure regulator until the attached gauge reads 7.5 psig.
9. Turn off the instrument.
10. Remove the source of zero air attached to the purge line inlet port at the back of the analyzer.
11. Remove the pressure gauge and reattach the end cap removed in step 4 above.
12. Replace the analyzer’s top cover.
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