Dräger PEX 3000

 _ Dräger PEX 3000
HQ_ Operation
4.3.2 Calibration menu
– To enter the calibration menu, press the ▼ key for more than one second
but less than three seconds. The display shows a flashing point on the
bottom right indicating the calibration mode.
ZE – Calibrating the zero-point
– Navigate using the ▲ or ▼ keys until the display shows ZE ("ZEro") and
confirm by pressing the (▲+▼) keys. The output signal switches to 3.4 mA.
– The display shows the currently measured gas concentration (negative
values are displayed up to “–9” or “-.9”).
– Apply zero gas to the sensor and wait for signal stabilisation (max.
3 minutes).
– Press the (▲+▼) keys to save the displayed value as a new zeropoint.
– Press the (▲+▼) keys once again to exit the function. The ZE display
appears once again.
– Press the ▼ key to the calibrate the span or
– Press the ▲ to switch back to measuring mode.
SP – calibrating the span
– Navigate using the ▲ or ▼ keys until the display shows SP ("SPan") and
confirm by pressing the (▲+▼) keys.
– The display shows the test gas concentration used during the previous
calibration in %LEL.
– Use the ▲ or ▼ key to set the concentration of the test gas currently in
use between 20 and 99 %LEL in 1 %LEL steps (or 0.1 %LEL steps
between 2.0 and 9.9 %LEL). Pressing the keys for a longer period
activates the repeat function.
– Press the (▲+▼) keys, apply test gas to the sensor and wait until the
displayed measured value has stabilised (maximum of 3 minutes).
– Press the (▲+▼) keys to recalculate and save the internal amplification.
– Press the (▲+▼) keys to display a reference value for the sensor’s
sensitivity (constantly amplified bridge signal).
– Press the (▲+▼) keys to exit the function. The display shows SP once
again.
– Press the ▲ key twice to return to measuring mode.
4.3.3 Maintenance menu
– To enter the maintenance menu, press the ▼ key for more than 3 seconds
until the display shows “SL” and the point in the bottom right corner flashes
to indicate the maintenance state.
SL – set current output to X mA
This function can be used to set the transmitter’s output signals to specific
constant values for test purposes.
NOTICE
This function can trigger alarms at the controller!
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