Filter
Top Products
3650 Portable O2 Analyzer - Calibrations 31 of 50
Operator Manual
ORBISPHERE
4 Calibrations
4.1 Pressure Calibration
Since the instrument is sealed against moisture, you must open the barometric pressure
sensor relief valve switch (on top of the instrument) 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 pressure sensor relief valve switch for
five seconds, then release.
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 a message will warn that the
current calibration will be lost.
Choose OK to continue. The calibration procedure then displays a Pressure Calibration
dialog box (as illustrated in Fig 4-2). 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 (as depicted in Fig 1-1 on page 7) 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.
Fig 4-1: Pressure Calibration Screen 1
Fig 4-2: Pressure Calibration Screens 2 & 3