Dräger PEX 1000 Notice D'utilisation page 32

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6. Measure the current by means of the amp meter or the controller unit.
7. Press the keys ▲ or ▼ to adjust the current output such that the amp meter reads a current
of 20 mA as accurately as possible (between 19.95 and 20.05 mA). Pressing the keys for
longer activates the repeat function.
8. Press keys (▲+▼). This saves the upper reference point and terminates the function. The
display shows CL again.
9. Press key ▲ twice to return to measuring mode.
4.4.3 CU – Adjusting the sensor current
This function is used to adjust the sensor current if the necessary sensor
current is different from the ex-factory adjustment.
Ex-factory values are:
In combination with sensing head SE Ex PR / HT ... DD/DQ:255 mA
WARNING
!
Adjustment of the sensor current must be followed by recalibration of the zero point
and sensitivity!
1. Navigate by means of keys ▲ or ▼ until the display shows CU ("CUrrent") and press keys
(▲+▼) to confirm.
The display shows the last two digits of the currently adjusted sensor current, e.g. the
display shows "70" for a sensor current of 270mA.
2. By means of key ▲ or key ▼ the sensor current can be adjusted between 240 mA (display
shows "40") and 300 mA (display shows "00") in steps of 1 mA. Pressing the keys for longer
activates the repeat function.
3. Press keys (▲+▼) to update the sensor current to the value displayed. The value is saved
and this function is terminated. The display shows CU again.
4. Press key ▲ three times to return to measuring mode.
4.4.4 So – Display Software Version
To document possibly necessary software modifications the software
version currently used in the PEX 1000 can be displayed with this function.
1. Navigate by means of keys ▲ or ▼ until the display shows So
("Software") and press keys (▲+▼) to confirm.
The display shows a figure between "0.1" and "9.9", indicating the
current software version.
2. Press keys (▲+▼) to terminate this function. The display shows So again.
3. Press key ▲ five times to return to measuring mode.
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Dräger PEX 1000