Extech Instruments CO80, Руководство пользователя

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CO80 V3.1 04/06 15
4. Taking Combustion Readings
4.1
Summary Procedure
1. Ensure batteries are charged, or instrument is connected to a
mains supply
(see 3.1).
2. Ensure water trap is empty
(see 2.8).
3. Switch on, select fuel, temperature and pressure scales,
printer/PC selection if modification is required
(see 4.3).
4. Take flue readings
(see 4.5).
5. Save, print, review or send data
(see 4.6).
6. Empty water trap.
7. Switch off
(see 4.7).
4.2
Switching On
Attach the appropriate probe and the filter/water trap, ensuring that the
assembly is fitted in-line in the right direction (
see 2.8
).
Important: The instrument should be calibrated in outside (clean)
ambient air.
Press and hold “
On/Off
” to activate the unit. The pump will be heard
working, and a countdown of 30 seconds will begin. “
Purge
” will be
displayed in the bottom left hand corner. Ensure the gas exhaust outlet is
not obstructed.
During this countdown, the oxygen cell will be calibrated to ambient air
conditions. At the end of the countdown sequence, the following will be
displayed:
4.3.
Scale Selection
Only during the 30 second purge period on power-up can the user alter
the fuel, pressure, temperature and communication settings. Should the
user wish to use another setting during operation, the power must be
recycled and the changes made during the second purge on power-up
cycle.
The CO and CO
2
readings
should read zero in outside
ambient air. “
rnG
” (range) is
displayed against “
Ratio
” if
the CO
2
reading is less than
0.5%.