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Fault, Cause, Remedy
Fault Cause Remedy
Instrument switches off automatically Power supply unit / batteries discharged
Instrument has been left ready
for measurement for more
than 4 minutes.
The result of the last test has
been displayed for at least
60 minutes (standard versions).
Charge rechargeable power supply unit,
page 22, or replace batteries, page 24
Yellow On-light is not lit after switching on
or is only faintly lit;
the display shows incomplete symbols
Power supply unit completely
flat, or 12-Volt connection defective
Recharge rechargeable power supply unit,
page 22, or replace batteries, page 24.
Check or replace 12-Volt connection, page 6
Green Ready-light not lit after switching
on and 4 min interval
Instrument malfunction Call DrägerService
No continuous tone when blowing
into the instrument
Instrument not yet ready
for measurement
Wait until green Ready-light is lit
Fault message in display Cause Remedy
E 0 Test person not blowing
hard or evenly enough
Ask to blow harder and more evenly
E 1 Sensor fault Switch instrument off and on,
if fault message re-appears, sensor must be
replaced by DrägerService
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