Dräger Polytron 6100 EC WL Notice D'utilisation page 42

en |
Operation
9 Operation
9.1 Special states
In a special state, correct measurement or alarm activation is not guaranteed.
Special states are as follows:
– Gas concentration outside measuring range
– Error
– Calibration
– Bump test
– Warm-up phase
– Maintenance mode
Special states are displayed in PolySoft.
9.2 Exiting special states
1. Identify the malfunction:
a. Check process value status (PV_STATUS).
b. Check device status (DIAG_STATUS).
c. Read out the device status using PolySoft.
2. Start with fault elimination (see "Troubleshooting", page 44) or follow
corrective measures according to PolySoft.
Errors and warnings are non-latching. If error or warning conditions are
resolved, the respective special state is also no longer transmitted.
10 Calibration
The configuration is done with PolySoft.
During calibration, the measuring accuracy of the sensor is checked and
calibrated with a known test gas concentration. First, the zero-point and then
the sensitivity of the sensor is calibrated. The length of the calibration intervals
depends on the respective regional normative requirements.
To ensure proper operation, never calibrate the sensitivity before the zero-point
is set. If these operations are performed in the wrong order, the calibration is
incorrect.
42 Instructions for use |
Dräger Polytron
WARNING
Incorrect calibration!
Incorrect calibration can lead to inaccurate measured values.
► After a sensor change, check all settings and parameters.
► Check a newly installed sensor with target gas to ensure correct operation.
10.1 Test gases
For test gas properties (e. g. humidity, concentration) refer to the corresponding
sensor data sheet.
Test gas humidity is irrelevant for O
Depending on the type of calibration different test gases are used.
Zero gas
Zero gas is a test gas to calibrate the zero point. If ambient air is free from
interfering impurities and measured gas, it can be used as zero gas. For O
CO sensors, nitrogen (N ) is used.
2 2
Calibration gas
Calibration gas is a test gas to calibrate the sensor sensitivity during span
calibration. Calibration gas is a known concentration of the measured gas
diluted with clean air or nitrogen. For O
as oxygen from ambient air is used.
10.2 Preparing the test gas supply
The test gas must be supplied without pressure. This corresponds to a volume
flow of 500 ml/min.
Prerequisite:
– The warm-up phases of the sensor are complete (see "Commissioning",
page 40).
– The date and time are set correctly (check with PolySoft).
®
6100 EC WL, Dräger Polytron
sensors.
2
sensors no calibration gas is needed,
2
®
Repeater ISA100
and
2