39
Section 6
Calibrations
6.1 Atmospheric pressure equilibrium
Since the instrument is sealed against moisture, you must open the barometric pressure sensor
relief valve switch on top of the instrument (refer to
for actual location) to
permit the instrument to achieve atmospheric pressure equilibrium, and take an accurate
barometric pressure reading.
This must be done with every calibration. To open the relief valve, depress and hold down the
pressure sensor relief valve switch for five seconds, then release.
6.2 Pressure calibration
If you have access to an accurate barometer, you may wish to calibrate the instrument's internal
barometric pressure sensor. This is done using the PC WinLog97 program. Choose
Troubleshooting
,
Pressure Calibration
and an informational message will appear to warn you
that the instrument’s current pressure calibration will be lost.
Choose
OK
to continue. The calibration procedure then displays a
Pressure Calibration
dialog
box. The
Measured Pressure
value shows the current instrument pressure reading.
Note:
Since the instrument is sealed against moisture, you must open the barometric pressure sensor relief
valve switch (location depicted in
) to permit the instrument to achieve atmospheric
pressure equilibrium, and take an accurate barometric pressure reading.
Enter the current atmospheric pressure, in mbars, in the
Calibration Pressure
entry box.
Choose
Calibrate
to direct the instrument to read and display the
Measured Pressure
using
this calibration value.
Choose
Quit
when you are satisfied with the pressure calibration to return to normal operation.
6.3 Calibration range checking
When calibrating the sensor in air or in a span gas, as detailed in
below, the
new calibration current should be between 25% to 175% of the ideal current (which is stored in
the instrument's non-volatile memory for each membrane). If not, the instrument displays
Err
on
its LCD and the system will not calibrate. When the system will not calibrate, it is likely that a
sensor service will be required.
Refer to
, if you suspect any problems with the analyzer.
Summary of Contents for ORBISPHERE 3650 Atex
Page 1: ...DOC024 52 93004 ORBISPHERE Model 3650 Atex USER MANUAL 10 2019 Edition 13...
Page 2: ...2...
Page 12: ...10 General Information...
Page 24: ...22 Installation...
Page 34: ...32 Operating Information...
