Dräger Polytron 8900 UGLD Notice D'utilisation page 16

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en Troubleshooting
5. Once the displayed value is 0 %, perform calibration.
a. Select calibrate and confirm.
 The message please wait... is displayed.
 The new zero value is displayed.
b. Select Next and confirm.
6. Select Next and confirm.
 The instrument returns to the calibration menu.
7. Detach the silencer cap.
The silencer cap must not be soiled. Store the silencer cap in
a clean environment. Dräger recommends storing the silencer
cap in the calibration kit case.
7.5 Performing a span calibration
Calibration can be aborted at any time. To abort calibration
select back.
Prerequisites:
– Calibration is prepared.
Refer to figure C on the fold-out page.
To perform a span calibration:
1. Check the tubing for holes. The tubing must be leak-proof.
2. Attach the pressure regulator to the compressed air (or
nitrogen) cylinder.
3. Fit calibration adapter to the sensor up to the stop.
4. Make sure the gas escapes the calibration adapter freely
within 25 cm (10 inch) from the calibration adapter.
5. Connect the tubing to the barbed fitting.
6. Enter the menu, see 6.6.3 Entering the menu
7. Select Calibration > Span calibration and confirm.
 The Maintenance signal is transmitted by the analog
interface, no alarm or fault relays are switched and the
symbol is displayed.
 The parameters for calibration are displayed:
Gas : UGLD
Unit: %
Concentr.:50
8. Adjust the number at concentration to the number printed
on the calibration adapter.
9. Select Next and confirm.
 The message Gas flow ON is displayed.
10. Select Next and confirm.
 The current value is displayed
11. Apply the gas flow.
After the displayed value is stable by +/- 1%:
12. Select Next and confirm.
 The message please wait... is displayed.
 The new current value is displayed.
13. Select Next and confirm.
14. Turn off air flow and remove the calibration adapter from
the sensor.
If the current value is not within the alarm range:
16
15. Select Next and confirm.
 The instrument returns to the calibration menu.
The calibration adapter must not be soiled. Store the
calibration adapter in a clean environment. Dräger
recommends storing the calibration adapter in the calibration
kit case.
8 Troubleshooting
8.1 Faults
Fault Cause
number
001, 003 Serious instrument
004, 005 fault, various causes.
011-014
020-024
043, 060
067
002 Serious data error in
025-027 the instrument, various
030-034 causes.
041, 042
044, 050
052, 081
085
010 4 to 20 mA interface
cable not connected.
045 Instrument not detect-
ing any sensor.
051, 054 Faulty zero calibration.
055 Faulty span calibration. Perform span calibra-
076 Instrument fault.
080-084
081 Sensor fault (Self test
failure) or Ultrasound
noise level > 85 % for
more than 1 h detected.
Instructions for use
Remedy
Have the instrument
checked by DrägerSer-
vice.
Reset the instrument to
factory default settings.
If this fault occurs
again: Have the instru-
ment checked by
DrägerService.
Disconnect the power
supply, connect the 4 to
20 mA interface and
reconnect the power
supply.
If operated as a stand-
alone instrument with-
out a central controller,
wire pin 3 to pin 4.
Check connections.If
this fault occurs again:
Have the instrument
checked by DrägerSer-
vice.
Perform zero calibra-
tion.
tion
Check electrical con-
nections.If this fault
occurs again: Have the
instrument checked by
DrägerService.
Silence ultrasound
noise or temporarily
cover sensor with
silencer cap. If error
remains longer than
1 h, replace sensor.
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Dräger Polytron 8900 UGLD