Instruction 19-9220
CO
2
Monitor 2800
If this happens, retry the Air Calibration procedure, ensuring that the
unit is only exposed to clean outside air. If the procedure is still unsuc-
cessful then the unit must be returned to a Bacharach Service Center
(see Section 4.2) for evaluation. This procedure will provide a good low
end CO
2
calibration.
3.3 Calibration Using Higher Gas Concentration
The unit should be checked periodically with a higher concentration of
CO
2
gas, depending on usage (every 3-6 months). Check the unit with a
gas typically in the 1.5 to 3.0% CO
2
range using the optional Calibration
Accessories (Section 4.1). Accuracy should be ±10% of reading.
If during the calibration check, the instrument reading is outside of the
tolerance of the check gas used, the instrument can be returned to a
Bacharach Service Center (see Section 4.2) for recalibration.
3.4 Test Mode
To activate the TEST MODE, switch the unit on, and then press and
hold down the
f
1
button. Both LEDs will illuminate and the alarm will
sound. The following screen will be displayed:
TestMode
Power
Provided that both alarm LEDs illuminate, the alarm sounds and the
display is as shown, the unit is ready for operation. If any of these func-
tions are NOT operating correctly, the unit must be returned immedi-
ately to Bacharach for service.
In the lower part of the Test Mode screen is a bar graph showing the ap-
proximate amount of battery power available. As the power in the unit
reduces, the bar graph decreases in size.
Full
Empty
5