Dräger PEX 3000 Manual Del Usuario página 32

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Control
7. Press the ▲ or ▼ key to adjust the current output such that the ammeter
reads a current of 20 mA as accurately as possible (between 19.95 and
20.05 mA). Pressing the keys for a longer period activates the repeat
function.
8. Press the (▲+▼) keys. This saves the upper reference point and exits the
function. The display shows CL once again.
9. Press the ▲ key twice to return to measuring mode.
4.4.3 CU – Adjust 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 settings are:
In combination with the sensing head Polytron SE Ex PR / HT ...
DQ:
In combination with the sensing head Polytron SE Ex LC ... DD: 276 mA
WARNING
Adjustment of the sensor current must be followed by the re-calibration of the
zero-point and sensitivity!
1. Navigate using the ▲ or ▼ keys until the display shows CU ("CUrrent") and
confirm by pressing the (▲+▼) keys.
– The display shows the last two digits of the currently adjusted sensor
current, e.g. the display shows "70" for a sensor current of 270 mA.
2. Use the ▲ or ▼ key to adjust the sensor current between 240 mA (display
shows "40") and 300 mA (display shows "00") in 1 mA steps. Pressing the
keys for a longer period activates the repeat function.
3. Press the keys (▲+▼) to select the displayed sensor current as the newly
set sensor current. The value is saved and this function is exited. The
display shows CU once again.
4. Press the ▲ key three times to return to measuring mode.
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4.4.4 dP – turning the decimal point on
This function is used to select the decimal point in the display if the
DrägerSensor LC M or the remote transmitter with the sensing head SE Ex LC
... DD is used with a measuring range of 0 to 9.9% LEL. The decimal point is
only displayed for gas concentration displays in % LEL.
1. Navigate using the ▲ or ▼ keys until the display shows dP ("decimal Point")
and confirm by pressing the keys (▲+▼). The decimal point is now
displayed if already selected. The flashing point on the bottom right is
switched off.
2. Use the ▲ or ▼ key to turn the decimal point on or off.
3. Press the keys (▲+▼) to save the current status and exit the function. The
display shows dP. The activated decimal point is not displayed, rather the
point at the bottom right flashes once again.
255 mA
4. Press the ▲ key four three times to return to measuring mode.
4.4.5 So – Display software version
To document necessary software modifications, this function can be used to
display the software version implemented in the transmitter.
1. Navigate using the ▲ or ▼ key until the display shows So ("Software") and
confirm by pressing the keys (▲+▼).
– The display shows a figure between "0.1" and "9.9", indicating the
current software version of the transmitter.
2. Press the (▲+▼) keys to exit the function. The display shows So once
again.
3. Press the ▲ key five three times to return to measuring mode.
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