Manual
12
5 Operation
When the remote display unit shows “ESC” you should take necessary safety actions before
entering the monitored room. Check the ventilation of the room and find out if there is CO
2
leakage while
using proper safety equipment. Once the CO
2
concentration in the air exceeds the second alarm
threshold, both devices (sensor unit and remote display unit) show an “ESC” indication on their displays.
The yellow LED “FLT” starts to flash. Use the “ReFactSet” function to restore the factory settings of the
gas detect
or. The “ESC” indication should disappear. You can also unplug the power plug from the wall
socket and plug it in again.
Make sure that the power plug sits in the wall socket tightly and that it is secured with the elastic
safety strip so that it cannot be unplugged without using mechanical tools.
When you take the PCE-WMM 50 out of its box, remove the protective rubber cap from the gas input
(M) and put it in position L. During operation, you should make sure that the gas input (M) is not blocked.
Once the mains adaptor is connected to a power source, the gas detector starts monitoring the CO
2
concentration in the ambient air, as well as the ambient air temperature. Set up the threshold levels in a
way that the alarms are triggered early.
5.1 Further measuring functions
“DIAG” function
The communication between the sensor unit and the remote display unit should be checked on a regular
basis by using the “DIAG” function. To do so, press the “Mode” key until a “DIAG” indication appears on
the display. Now press the “Enter” key for confirmation. All four LEDs on the sensor unit should now start
to flash and the buzzer should make a noise. After that the same should happen with the remote display
unit as well. If this worked properly, the communication between both devices is good.
Calibration function
The gas detector should be calibrated at least every two years. To do so, you can use the ambient air
outdoors. The housing needs about 10 minutes to acclimate. Wait until the CO
2
reading on the display is
stable. The display should indicate between 380 and 420 ppm.
Do not breathe in the direction of the gas detector while calibrating it. This might falsify the readings.
Press the “Mode” key until a flashing “Cali” indication appears on the display. After that, press “Enter” to
confirm.
Now the “Cali” indication is shown on the display continuously. Press and hold the “Mode” key for
at least 10 seconds. The calibration is carried out automatically. After 10 minutes, the display shows
“Pass” or “Fail”. “Fail” means that the calibration failed and has to be done again. “Pass” means that the
calibration was successful. Press the “Enter” key to exit the calibration function.
