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8. Perform zero calibration at the receiver:
®
a. On the HART
handheld terminal, select 5 / Maintenance in the main menu.
b. In the 5 / Maintenance menu, select 6 Zeroing.
The gas warning system performs the zero calibration for the 4 mA measured signal. The maintenance signal is output
on the 4 to 20 mA interface. The yellow and green LEDs on the receiver flash alternately.
When zero calibration is complete, Zeroing status: Completed successfully is displayed. The gas warning system changes
to measuring mode.
9. Check functionality using test gas sheets:
®
a. On the HART
handheld terminal, select 5 / Maintenance in the main menu.
b. In the 5 / Maintenance menu, select 7 Test Span.
®
The HART
handheld terminal displays the measured gas value. The maintenance signal is output on the
4 to 20 mA interface. The yellow and green LEDs blink alternately. No signal is transmitted to the control unit.
c. Select the correct test gas sheets depending on the component. Hold the 5 test gas sheets in front of the receiver lens.
d. On the display of the HART
greater than 1 LELm.
e. If the measured value lies outside the measuring range, remove the gas test sheets one by one until the value is within
the measuring range.
f. Exit Test Span mode
®
g. Exit the HART
application.
The functional test ensures that the gas warning system displays the measured value when gas is located in the measuring
path.
Functionality can also be tested using a gas cell kit.
NOTICE
After commissioning, activate the alarm activation in the control unit if necessary.
4.2.7
Performing an application-specific configuration
The factory setting of the parameters is described in Chapter 8.4 on Page 67. The parameters can be changed if necessary. Any
®
HART
handheld terminal with the Dräger Device Description (DD) or a computer with Dräger PolySoft can be used for this.
4.3
During operation
The status of the gas warning system is displayed using the status LEDs and transmitted to the control unit via the
4 to 20 mA interface.
1) The gas warning system exits Test Span mode automatically after 1 hour and returns to measuring mode.
®
handheld terminal, check whether the gas warning system displays a measured value
1)
.
Operation
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