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Instruction Manual
748214-V
June 2009
3-4 Operation Rosemount Analytical Inc. A Division of Emerson Process Management
Model 951C
3. Establish correct pressure for air by the fol-
lowing:
a. Adjust OZONE Pressure Regulator so
that OZONE Pressure Gauge indi-
cates 20 to 25 psig (138 to 172 kPa).
b. To establish correct pressure of zero gas,
supply zero gas to rear panel SAMPLE
inlet. Note reading on internal SAMPLE
Pressure Gauge. It should be the same
as the nominal 4 psig (28 kPa) for the Lo
and Hi Ranges and 2.5 psig for the Mid
Range SAMPLE pressure indicated on
the internal SAMPLE pressure gauge.
This should remain constant when the
analyzer input SAMPLE is switched from
calibration gas standard to a zero gas
standard. This may be assured by setting
the delivery from the SAMPLE and the
zero gas cylinder of span gas cylinder to
the same value of delivery pressure,
nominally 20 psig (138 kPa). If not, ad-
just output pressure regulator on zero gas
cylinder as required.
4. Establish correct pressure of sample gas
by the following:
a. Supply sample gas to rear panel
SAMPLE inlet.
b. Adjust SAMPLE Backpressure Regula-
tor so internal SAMPLE Pressure
Gauge indicates the value appropriate
to the desired operating range.
NOTE
Inability to obtain a flow of one liter per
minute at the EXHAUST outlet usually
indicates insufficient sample supply
pressure at the SAMPLE inlet. Use a
2400 cc flowmeter (i.e., Brooks P/N
1350) at the EXHAUST outlet to
measure flow.
5. Establish correct flow of upscale standard
gas by the following:
a. Supply upscale standard gas to rear
panel SAMPLE inlet.
b. Note reading on internal SAMPLE
Pressure Gauge. It should be the
same as in Step 3b.
NOTE
Supply pressures for sample and
upscale standard gases must be the
same. Otherwise, readout will be in
error.
The analyzer is now ready for calibration.