Dräger MQG 0011 Gebrauchsanweisung Seite 26

Operation
1. Switching off the instrument: Press and hold OK key and [+] key
simultaneously.
2. Loosen the screw on the power pack and remove the power pack.
Battery holder (order no. 83 22 237): replace alkaline batteries or

NiMH rechargeable batteries. Ensure correct polarity.
NiMH power pack T4 (Type HBT 0000) / T4 HC (Type HBT 0100):

replace complete power pack.
3. Insert the power pack into the instrument and tighten the screw,
the instrument switches on automatically.
4.9.2 Charge instrument with NiMH power pack T4
(Type HBT 0000)/ T4 HC (Type HBT 0100)
WARNING
!
Explosion hazard!
Do not charge underground or in explosion hazard areas!
The chargers are not designed in accordance with the
regulations for fire damp and explosion protection.
Charge NiMH power packs T4 (type HBT 0000) or T4 HC
(type HBT 0100) with the appropriate Dräger charger.
Ambient temperature during charging: 0 to +40 °C.
Insert the switched off instrument into the charger module.

Display LED on the charger module:
Charge
Malfunction
Full
To protect the battery charge only in the temperature range of 5 to 35 °C.
Outside this temperature range, the charging process is automatically
interrupted and automatically continued after the temperature range has
been reached again. The charging time is typically 4 hours. A new NiMH
power pack reaches its full capacity after three complete charge/
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discharge cycles. Never store the instrument for extended periods without
being connected to a power source (maximum of 2 months) because the
internal buffer battery will drain.
4.9.3 Carrying out manual bump test
NOTICE
i i
The automatic bump test with the Bump Test Station is
described in the Technical Handbook.
1. Prepare a test gas cylinder, the volume flow must be 0.5 l/min and
the gas concentration must be higher than the alarm threshold
concentration that is to be tested.
2. Connect the test gas cylinder with the calibration cradle (order no.
83 18 752).
CAUTION
!
Never inhale the test gas. Health hazard!
Observe the hazard warnings of the relevant safety data sheets.
3. Switch on the instrument and insert it into the calibration cradle –
press downwards until it engages.
4. Open the test gas cylinder valve to let test gas flow over the sensors.
5. Wait until the instrument displays the test gas concentration with
sufficient tolerance:
Ex: ±20 % of the test gas concentration
1
O : ±0.6 vol. %
2
TOX: ±20 %. of the test gas concentration
If the alarm thresholds are exceeded, the instrument displays the
gas concentration in alternation with A1 or A2 depending on the
test gas concentration.
6. Close the test gas cylinder valve and remove the instrument from
the calibration cradle.
1) During application of the Dräger mixed gas (order no. 68 11 130) the displays should be
within this range.
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Dräger X-am 2500