8
Calibrating the gas detector
en
5
Calibrating the gas detector
WARNING
Danger to health!
Do not inhale the test gas. Observe the hazard warnings on
the corresponding Safety Data Sheets and the instructions for
use of the gas detector! Observe national regulations when
defining calibration intervals.
For Pac 8500, two measuring channels are used for the
calibration.
Calibration must be performed by qualified personnel after
a failed bump test or after a defined calibration interval (see
EU standard EN 50073).
Recommended calibration interval for the O
2
, H
2
S and CO
sensors: 6 months. Calibration intervals for other gases:
see the instructions for use of the respective
DrägerSensors.
Calibration can be carried out as follows:
Manual calibration or calibration using the Dräger
CC-Vision Basic
Automatic calibration with the Dräger X-dock (see the
instructions for use for the Dräger X-dock)
Automatic calibration with the Dräger Bump Test Station
(see the quick reference guide on the Dräger Bump Test
Station)
5.1
Opening the maintenance menu
The gas detector automatically returns to measuring mode
if no button is pressed in the menu for 1 minute (with the
exception of the span calibration menus, where the menu
remains active for 10 minutes without any activity).
The maintenance menu is password protected.
Factory setting: 001
1. Hold down the [
▼
] button for 5 seconds.
2. Enter the password. Press the [
▼
] button to change the
value of the flashing position. Press the [OK] button to
confirm the value. Repeat this procedure to define the next
two values. After the last confirmation with the [OK] button,
the entire password flashes.
3. Press the [OK] button to confirm the password or the [
▼
]
button to cancel the password.
4. If the correct password is entered, a signal tone sounds
and the fresh air calibration symbol flashes (configurable).
5. Press the [OK] button to open the fresh air calibration or the
[
▼
] button to switch to the span calibration.
6. Press the [OK] button to open the span calibration or the
[
▼
] button to switch back to measuring mode.
5.2
Carrying out a manual fresh air
calibration
To improve accuracy, a fresh air calibration can be carried out
if there is a zero deviation.
Observe the following notices for the calibration:
During fresh air calibrations, the zero point of all sensors
(except the DrägerSensors XXS O
2
) is set to 0. For the
XXS O
2
, the reading is set to 20.9 Vol%.
The DrägerSensor XXS O
3
must be calibrated with a
suitable zero gas which is free from carbon dioxide / ozone
(e.g. N
2
).
To carry out the fresh air calibration:
1. Open the maintenance menu, see Section 5.1 on Page 8.
2. Press the [OK] button while the fresh air calibration symbol
is flashing. The measured value flashes.
3. Press the [OK] button to confirm the fresh air calibration or
the [
▼
] button to cancel the fresh air calibration.
The gas detector returns to measuring mode, or the span
calibration symbol flashes (depending on the
configuration).
Fresh air calibration passed: A short double tone sounds,
and
OK / gas name
is shown in an alternating display.
Press the [OK] button to return to measuring mode.
Fresh air calibration failed: A long single tone sounds.
– – –
is displayed instead of the measured value. The error
symbol and the fresh air calibration symbol are displayed.
In this case, repeat the fresh air calibration or calibrate the
gas detector.
