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Servicing
Pressure Transducer Calibration
Retaining Screws (2)
Pressure Transducer Assy
Figure 7–13. Replacing the Pressure Transducer Assembly
Use the following procedure to calibrate the pressure transducer.
Pressure
Transducer
Notes An error in the zero setting of the pressure transducer does not
Calibration
introduce a measurable error in the output concentration reading.
Therefore, if only a barometer is available and not a vacuum pump, adjust
only the span setting.
▲
A rough check of the pressure accuracy can be made by obtaining the
current barometric pressure from the local weather station or airport and
comparing it to the pressure reading. However, since these pressures are
usually corrected to sea level, it may be necessary to correct the reading to
local pressure by subtracting 0.027 mm Hg per foot of altitude.
▲
Do not try to calibrate the pressure transducer unless the pressure is known
accurately.
▲
Equipment Required:
Vacuum pump
Thermo Fisher Scientific
Model 43i Trace Level-Enhanced Instruction Manual
7-27
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Troubleshooting
