Dräger PIR 7000, Instructions For Use Manual, Page: 21 / 420

21
Measurement mode
The gas transmitter generates a 4 to 20 mA signal proportional to the measured gas
concentration if the gas transmitter is configured for analogue signal transmission.
Fault messages are transmitted with a higher priority than warning messages. Warning
messages are transmitted with a higher priority than measurement values.
Maintenance
The gas transmitter is maintained either with the magnetic wand (order no. 45 44 101,
calibration only) or with the Dräger RAB 7000 remote access box (order no. 68 12 830,
calibration and configuration of parameters requiring changing for calibration only) or with a
PC and the Dräger PolySoft software or with a HART
®
remote control. All states (e. g. manual
setting of the analogue output signal) that temporarily interrupt the measurement operation of
the gas transmitter are indicated by the status lights (steady green and flashing yellow).
Maintenance intervals
EN 60079-29-2 and the applicable national standards must be observed.
During commissioning

Check operation of the yellow and green status lights during the automatic self-test.

Check the zero calibration.

Check current interface and if applicable HART communication.
At regular intervals , which must be specified by the management of the gas warning system
– recommended 6 months:

Check zero and span calibration.

Check signal transmission to the central device and alarm activation.

The calibration interval can be extended beyond the recommended 6 months subject to
the following conditions: The gas inlet to the measurement cuvette must be checked after
a maximum period of 6 months to check whether it could be blocked, e. g. by dust oil etc.,
in the specified application. If reduced function is not likely due to this effect, the calibration
interval can be extended – recommended: maximum 24 months.
Annually

Inspection by specialists. The inspection intervals in each individual case are influenced and
if necessary reduced by technical safety considerations, engineering processes and the
technical requirements of the equipment.

Test of alarm triggering. The alarm triggering function must be tested by application of test
gas or by setting the analogue signal manually (with a PC and the Dräger PolySoft software).
The test gas concentration or the set analogue signal must be high enough to trigger the
main alarm.
Checking the measuring cuvette of the gas transmitter and cleaning if necessary

To avoid false alarms during the inspection, set the analogue output signal to maintenance
signal or ensure that the alarm activation on the central controller is locked.

Remove the splash guard and if necessary other accessories from the gas transmitter.

Inspect the air inlets and outlets for contamination and damage.

Inspect the mirror and window for contamination, clean with water or alcohol and wipe dry
with cotton wool or a cloth. Do not scratch mirror and window!

Replace the splash guard and if necessary other accessories on the gas transmitter.

Reactivate the analogue output signal if it was set to maintenance signal. Unlock alarm
activation at the central device.
Calibration
The gas transmitter is operated either with the magnetic wand (order no. 45 44 101) or Dräger
RAB 7000 remote access box (order no. 68 12 830) or with a PC and the Dräger PolySoft
software or with a HART
®
remote control. Test gases for calibration are applied with the
PIR 7000 calibration adapter (order no. 68 11 610) or the PIR 7000 / 7200 flow cell
(order no. 68 11 490 / 68 11 910) or the PIR 7000 flow cell Duct (order no. 68 11 945) or the
PIR 7000 process adapter (order no. 68 11 915) or the PIR 7000 process cuvette
(order no. 68 11 415) or the PIR 7000 SGR process cuvette (order no. 68 13 219).
The installation instructions for the applicable accessories must be followed.
Handling the magnetic wand:
The gas transmitter has two contact points on the housing, labelled
as
" 0 " and " S " . Place the magnetic wand on the contact points for
calibration as shown in the following diagram.
Current Meaning
4 mA Zero point
20 mA Full-scale deflection
Special states
<1.2 mA Fault, configurable
2 mA Beam block warning, configurable
3 mA Maintenance signal, configurable
3,8 mA ... 4 mA Under range
20 mA ... 20,5 mA Measuring range exceeded
>21 mA Unit fault.
NOTICE
EN 50271:2010 specifies that "the maximum duration for 4 consecutive updates of the output
signals" must not exceed the measurement value adjustment time t0…90 of the gas transmitter.
For the Dräger PIR 7000 / Dräger PIR 7200 the measurement value is recalculated approx.
every 2 s ("normal" response) or approx. every 0.5 s ("fast" response), and the current value of
the analogue 4 to 20 mA output signal is updated approx. every 100 ms.
NOTICE
Always calibrate the zero-point before span. To adjust the span, use the calibration gas
configured in the gas transmitter.
NOTICE
After the timeout periods the process is automatically terminated without saving the values
and the gas transmitter is restored to measurement mode.
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0
S