Span Calibration; Performing Span Calibration; Automatic Calibration; Troubleshooting - Dräger PointGard 2000 Serie Instrucciones De Uso

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Troubleshooting

2. Apply synthetic air or nitrogen, if ambient air cannot be
used.
a. Set gas flow corresponding to the sensor used (see
"Gas flow for calibrations", page 17)
3. Select Next and confirm.
 The current value is displayed.
After the test gas has been applied to the sensor for 3
minutes and the displayed value is stable perform
calibration.
4. Select calibrate and confirm.
 The message please wait... is displayed.
 The new current value is displayed.
5. Select Next and confirm.
6. Turn off gas flow and remove the calibration adapter from
the sensor or disconnect tubing.
If the current value is not within the alarm range:
7. Select Next and confirm.
 The instrument returns to the calibration menu.
8.5

Span calibration

PointGard 2200 CAT / 2200 CAT Remote IR / 2700 IR -
specific:
The span calibration has to be performed within 24 h after the
last valid zero calibration.
PointGard 2200 CAT Remote with IR sensor:
Due to the design of the DSIR gas sensor, the output signal of
the gas sensor is limited to 45 % . . . 55 % of the instrument-
internal supply voltage. If the gas concentrations increase
further after the maximum sensor output signal has been
reached, this does not lead to an increase of the values
displayed on the instrument response transmitted to the
central device. In case of substances with particularly low
calibration factors and/or manual configuration of a high span
calibration factor at the sensor, this may already happen at
concentrations below 100 %LEL. For substitute gas
calibrations, correct triggering of the alarm should therefore
be checked with a test gas concentration corresponding to the
alarm threshold. If necessary, the measuring range which can
be represented can be increased as required by a reduction
of the sensor output signal (see DSIR Instructions for Use,
part number 9023981) and subsequent calibration at the
instrument.

8.5.1 Performing span calibration

Calibration can be aborted at any time. To abort calibration
select back.
Prerequisites:
– Zero-point is calibrated.
– Calibration is prepared.
– PointGard 2200 CAT / 2200 CAT Remote IR / 2700 IR -
specific: Zero calibration was performed within 24 h before
starting span calibration.
18
Perform span calibration
1. 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 the calibration gas are displayed,
1)
e. g.:
Gas : H S
2
Unit: ppm
Concentr.:25
2. If the displayed parameters do not match the target gas,
adjust the parameters:
a. Select Gas and confirm.
b. Select the calibration gas from the list and confirm.
c. Select Unit and confirm.
d. Select the unit of measurement from the list and
confirm.
e. Select Conc. and confirm.
f. Set the concentration of the calibration gas.
3. If settings are correct:
a. Select Next and confirm.
 A message like Gas flow ON H
4. Apply calibration gas.
a. Set gas flow corresponding to the sensor used (see
"Gas flow for calibrations", page 17)
5. Select Next and confirm.
 The current value is displayed
After the test gas has been applied to the sensor for 3
minutes and the displayed value is stable perform
2)
calibration :
6. Select Next and confirm.
 The message please wait... is displayed.
 The new current value is displayed.
7. Select Next and confirm.
8. Turn off gas flow and remove the calibration adapter from
the sensor or disconnect tubing.
If the current value is not within the alarm range:
9. Select Next and confirm.
 The instrument returns to the calibration menu.
8.6

Automatic calibration

For further information and configurations, consult the
technical manual 9300148.
9 Troubleshooting
If the display is not working properly, have the instrument
checked by Dräger.
1) Not applicable for all sensors (see "Display, analog interface and relay
status", page 13).
2) For LC sensors the test gas must be applied for at least 6 minutes.
Instructions for use
S is displayed.
2
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Dräger PointGard 2000 Series