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Maintenance
If the deviation is greater than ±5 %LEL or 0.05 Vol% CO
the span calibration is invalid and an error or a warning is
displayed (configurable).
● For a span calibration of Dräger IR sensors, it is assumed
that a valid zero-point calibration exists (no more than
30 min. old), otherwise an acknowledgeable warning is
displayed.
Calibration may not be possible due to instrument and
channel errors.
5.5.1 Fresh air calibration
To improve accuracy, a fresh air calibration must be carried
out if a zero deviation exists.
Observe the following notices for the calibration:
● For the fresh air calibration of Dräger IR sensors for
explosive hydrocarbon, it is assumed that the change in
the zero-point leads to a change of less than or equal to
±5 %LEL of the measured value at 50 %LEL. If the
deviation is greater than ±5 %LEL, the span calibration is
invalid.
● For the fresh air calibration, the display on the XXS O
and XXS O
PR is set to 20.9 Vol%.
2
Requirements:
– Fresh air calibration can only be carried out if at least one
sensor supports the fresh air calibration.
– The fresh air must be free of measured or interfering
gases.
– The gas detector is switched on and warm-up phases 1
and 2 are complete.
To carry out a fresh air calibration:
1. Switch on the gas detector.
2. Call up the fresh air calibration (depending on the
configuration):
If the fresh air calibration was released for user level 0 by
the Dräger CC-Vision PC software:
● Select
> Maintenance > Fresh air cal..
If the fresh air calibration was not released for user level 0
by the Dräger CC-Vision PC software:
a.
> Login
b. Enter and confirm the password.
c. Select Maintenance > Fresh air cal..
3. Select
to start the fresh air calibration.
All measuring channels which are included in the fresh
air calibration flash, and all others are greyed out.
The result is displayed as follows for every measuring
channel:
fresh air calibration successful.
fresh air calibration failed.
4. If necessary, press
this case, a calibration takes place immediately.
38
to overrule the stability control. In
,
2
Dräger recommends using the automatic stability
control (wait until the gas detector has automatically
carried out the calibration).
The new measured value is displayed for control
purposes.
The result is displayed as follows:
fresh air calibration successful.
fresh air calibration failed.
5. The fresh air calibration is complete when all participating
measurement channels have passed or failed the fresh air
calibration.
● Select
and then confirm the dialog to discard the
result.
● Select
to confirm the result.
If there was an error during the fresh air calibration:
– Repeat the fresh air calibration.
– If necessary, replace the sensor.
5.5.2 Carrying out a single-gas calibration
2
Please note the following in relation to the single-gas
calibration:
● For a single-gas calibration, you can choose either the
zero-point calibration and span calibration.
● With a zero-point calibration, the zero-point of the selected
sensor is set to zero.
● With the zero-point calibration, it is assumed for Dräger IR
sensors that the change to the zero-point is less than or
equal to ±5 %LEL or 0.05 Vol% CO
value at 50 %LEL or 0.5 Vol% CO
greater than ±5 %LEL or 0.05 Vol% CO
calibration will be invalid and an error or warning will be
issued (configurable).
● With a span calibration, it is assumed for Dräger IR
sensors that there is a valid zero-point calibration (no older
than 30 min), otherwise an acknowledgeable warning will
be issued.
● With a span calibration, the sensitivity of the sensor
selected is set to the concentration value of the test gas.
Use a standard test gas.
Allowed test gas concentration:
2 1)
DUAL IR CO
(ES)
2 1)
IR CO
(ES)
1)
DUAL IR Ex
(ES)
1)
(ES)
IR Ex
CatEx125 PR
CatEx125 PR Gas
1)
CatEx H
100
2
O
, O
PR
2
2
H
S
2
1)
H
HC
2
Dual IR Ex/CO
HC
2
1)
(CO
channel)
2
1)
PID HC
of the measured
2
. If the deviation is
2
, the span
2
2)
0.05 to 5 Vol%
The permitted test gas con-
centrations are shown by the
gas detector during the sin-
gle-gas calibration of the sen-
sitivity.
20 to 80 Vol%
100 ppm iBut
Instructions for use
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3500
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