Technical Manual | Dräger Polytron
®
8000 Series 51
Calibration
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.
9.6 Span calibration
Polytron
®
8200 CAT / 8310 IR / 8700 IR - specific:
The span calibration has to be performed within 24 h after the last valid zero
calibration.
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.
9.6.1 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, e. g.:
4)
Gas : H2S
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.
4) Not applicable for all sensors (see "Display, analog interface and relay status", page 41).
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