Dräger PEX 1000 Manual De Instrucciones página 25

4.3 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.
4.3.1 ZE – Calibrate the zero-point
1. 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 "–5" or "–,9").
2. Apply zero gas to the sensor and wait for signal stabilisation (max.
3 minutes).
3. Press the ( +▼) keys to save the displayed value as a new zero-point.
4. Press the (▲+▼) keys once again to exit the function. The ZE display
appears once again.
5. Press the ▼ key to the calibrate the sensitivity or
6. Press the button to switch back to the measuring mode.
4.3.2 SP – Calibrate the sensitivity
1. Navigate using the ▲ or ▼ keys until the display shows SP ("SPan") and
confirm by pressing the (▲+▼) keys.
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– The display shows the test gas concentration used during the previous
adjustment 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.
2. Press the (▲+▼) keys, apply test gas to the sensor and wait until the
displayed measured value has stabilised (maximum of 3 minutes).
3. Press the (▲+▼) keys to recalculate and save the internal amplification.
4. Press the (▲+▼) keys to display a reference value for the sensor's
sensitivity (constantly amplified bridge signal).
5. Press the (▲+▼) keys to exit the function. The display shows SP once
again.
6. Press the ▲ key twice to return to measuring mode.
4.4 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.
4.4.1 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.
This function can trigger alarms at the controller!
1. Navigate using the ▲ or ▼ keys until the display shows SL ("Set Loop") and
confirm by pressing the (▲+▼) keys.
– The current output of the transmitter is set to 4 mA, the display shows
"04".
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