Oldham BM25, Руководство пользователя

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24 BM 25/25W
Instruction Manual
Step 1: Switch the instrument on
■
Press and hold the Acquit button (ref. 1). Press the
Enter button (ref. 2) to switch the instrument on.
■
Release both buttons.
■
When warm-up is complete, the BM 25/25W displays
the list of different gases. The gas currently selected
is highlighted.
Figure 14: press 1 and 2 to
select the calibration gas
Step 2: Select the reference gas
■
Use the Acquit button (Figure 14: press 1 and 2 to select the calibration gasref. 1)
to scroll down the list of gas. Thirty-one (31) combustible gases are available in the
library. Choose
Other to select a gas for your specific needs.
Note: if a gas is not selected in the allotted time, the monitor will start in normal
mode without changing the reference gas.
■
Press the Enter button (ref. 2) to confirm your choice.
■
The BM 25/25W starts another test routine. Once the test is complete, the selected
gas is now the reference gas.
Test Routine and Calibration Overdue
During warm-up the BM 25/25W performs a self test and then starts gas measurement.
If the test is not completed successfully, the BM 25/25W goes into fault mode
(continuous audible and visual signal).
When the calibration date for a sensor is overdue, the BM 25/25W triggers a calibration
alert for the appropriate channel. This warning message may be dismissed and the
instrument will operate using its previous calibration settings; however, as the sensors
response may have diminished, the instrument should be recalibrated and tested.
Gas monitor positioning
Position the monitor vertically at the relevant location by taking into account the density
of the gases and the airflow.
Diffusion mode
In this configuration, the gas monitor is used without additional sampling device; the
sensors monitor the ambient atmosphere.