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Servicing
Pressure Transducer Calibration
Retaining Screws (2)
Pressure Transducer
Calibration
7-22
Model 48i Trace Level-Enhanced Instruction Manual
2. Disconnect plumbing from the pressure transducer assembly
2). Note the plumbing connections to facilitate reconnection.
3. Disconnect the pressure transducer from the PRES connector on the
measurement interface board.
4. Loosen the two pressure transducer assembly retaining screws and
remove the pressure transducer assembly
Figure 7–12. Replacing the Pressure Transducer
5. To install the pressure transducer assembly, follow the previous steps in
reverse.
6. Calibrate the pressure transducer. Refer to the
Calibration" procedure that follows.
Use the following procedure to calibrate the pressure transducer.
Note An error in the zero setting of the pressure transducer does not
introduce a measurable error in the output concentration reading.
Therefore, if only a barometer is available and not a vacuum pump, only
adjust 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 mmHg per foot of altitude.
Do not attempt to calibrate the pressure transducer unless the pressure is
known accurately.
▲
(Figure
▲
(Figure 7–
7–12).
"Pressure Transducer
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Thermo Fisher Scientific
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