58
Technical Manual
|
Dräger Polytron
®
8000 Series
Maintenance
Sensor lock function
If a sensor of the same type (same part number) was previously installed, the
instrument specific configuration is retained (gas type, measuring range, test gas,
calibration interval, etc.) Otherwise the factory default settings of the new sensor
are uploaded and will overwrite the instrument specific configuration. This can be
prohibited if the sensor lock function 77 is activated.
Sensor change function
With the menu function
Change Sensor
, a sensor can be changed during
operation without triggering a fault signal at the control unit. It also ensures that all
sensor data in the microprocessor can be saved in the sensor memory (EEPROM)
before disconnecting the sensor.
Replacing the sensor
Refer to figure C under Installing EC sensor
A sensor can be replaced at any time.
1. Select
Settings
>
Sensor
>
Change Sensor
and confirm.
The maintenance signal is generated on the 4-20mA interface.
The display shows
Please remove the sensor
.
The Maintenance symbol is displayed.
2. Replace the old sensor with a new sensor:
a. Loosen set-screw (2)
b. Unscrew bayonet ring (3)
c. Insert sensor (4) into the opening. The Dräger logo on the sensor must point
to the mark on the sensing head housing (5).
d. Lock sensor with bayonet ring (3)
e. Tighten set-screw (2). Mandatory for Zone 22 installations.
The display shows:
Loading data, please wait
3. If necessary, apply the label included with the sensor to the instrument. This
identifies the gas type from a distance, even if the power has failed.
4. When the sensor data are loaded, the display shows:
Data loaded
.
5. Select
Back to menu
and confirm.
The maintenance signal on the 4-20mA interface remains pending until the
sensor is warmed-up.
Maximum warm-up time of a new sensor: see the Instructions for Use for the
sensor. For Oxygen: EN 50104 approvals.
6. Check calibration. If necessary, calibrate the instrument (see "Calibration",
page 47).
7. Check the installation requirements and instrument for SIL status.
See sections "Mechanical installation" through "Remote sensors".
11.2.2 Polytron
®
8200 CAT, 8310 IR, 87x0 IR
Replacing the sensor
1. If required, set the maintenance current for the analog interface.
2. Turn off power to the instrument or declassify the area according to local
regulations.
