Commissioning The Transmitter; Turning On The Supply Voltage; Calibrating The Transmitter - Dräger PEX 3000 Manual Del Usuario

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Operation
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.
Press the ▲ key three times to return to measuring mode.
dP – turning the decimal point on
This function is used to select the decimal point in the display if the
DrägerSensor LC M (type XTR 0010 or XTR 0011) or the remote transmitter
type XTR 0090 or XTR 0091 with sensing head SE Ex LC ... DQ is used with a
measuring range of 0 to 9.9 %LEL. The decimal point is only displayed for gas
concentration displays in %LEL.
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.
Use the ▲ or ▼ key to turn the decimal point on or off.
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.
Press the ▲ key four three times to return to measuring mode.
So – displaying the software version
To document necessary software modifications, this function can be used to
display the software version implemented in the transmitter.
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.
Press the (▲+▼) keys to exit the function. The display shows So once
again.
Press the ▲ key five three times to return to measuring mode.
4.4

Commissioning the transmitter

Open the transmitter's housing cover.
WARNING
Dust explosion protection is not ensured after having opened the transmitter's
housing. The Ex area has to be temporarily de-classified, if necessary!
4.4.1

Turning on the supply voltage

After turning on the supply voltage, all 14 LED segments including both
points are activated for approx. 5 seconds to make sure that they are not
faulty ("Lamp test"). Internal test routines run in the transmitter during this
period, the transmitter's output signal is 1 mA.
After this, the display changes, with approx. 1 Hz, between two horizontal
lines and the currently measured gas concentration. During this time the
transmitter's output is 3.4 mA.
After one minute the transmitter is ready for operation. If the zero-point is
not undercut by more than 5 %LEL or 1 %LEL, it displays the current
measured value, and the output signal corresponds to the measured value.
Type XTR 0090 or XTR 0091 with sensing head SE Ex LC M ...DQ: Adjust
the sensor current to 276 mA with the "CU – setting the sensor current"
function (see page 15).
Allow the transmitter to warm-up for at least 10 minutes (sensor warm-up
time) before calibration.
4.4.2

Calibrating the transmitter

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