Span Calibration; Performing Span Calibration; Automatic Calibration; Performing Automatic Calibration - Dräger Polytron 87x0 IR Serie Gebrauchsanweisung

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en 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.
9.4

Span calibration

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Polytron 8310 IR-specific:
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.

9.4.1 Performing span calibration

Calibration can be aborted at any time. To abort calibration
select back.
Prerequisites:
– Zero-point is calibrated.
– Calibration is prepared.
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.
1) Not applicable for all sensors (see "Display, analog interface and relay
status", page 15).
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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
"Enter the menu, see 8.6.3 Entering the menu",
page 19)
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.
9.5

Automatic calibration

Automatic calibration (Auto calibration) combines zero
calibration with subsequent span calibration and represents
an alternative to performing the zero and span calibration
manually.
Not all sensors and gases support auto calibration. If the
function is not available, perform the calibration manually.

9.5.1 Performing automatic calibration

Calibration can be aborted at any time. To abort calibration
select back.
Prerequisites:
– Automatic calibration is enabled
– Sensor has finished the warm-up phase
– Calibration is prepared.
Perform automatic calibration
1. Apply Synthetic Air or Nitrogen if ambient air cannot be
used.
2. Select Calibration > Auto calibration and confirm.
 The message please wait... is displayed and the
instrument automatically performs the zero calibration.
 In case of an O
sensor Fresh air cal. is displayed.
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2) For LC sensors the test gas must be applied for at least 6 minutes.
Instructions for use
S is displayed.
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Dräger Polytron 8000 Series