Ecom B Operating Instructions Manual page 40

Sensors
Each time the instrument is switched on the sensors are calibrated
with fresh air. The instrument permanently monitors the condition of
the sensors. New sensors wear out from use in time due to reaction
(O2-sensor) and due to soiled gases respectively gases in concen-
trations beyond the nominal range (toxic sensors). The output values
of the sensors are (see menu "Control"):
O2
CO
If an error message is displayed during calibration cycle and does
not disappear after repeated calibrations the instrument must be
send to a service centre. The O2 sensor should show > 200 mV,
otherwise it should be changed.
The CO-sensor is protected by the internal program for overload. In
case the limit of 4000 ppm is exceeded the gas pump is switched off.
Power supply
The battery ensures a main power independent operation. The bat-
tery is automatically charged when the instrument is connected to
the main power supply. (Please do not interrupt the charging shortly
since the charging circuitry could operate faulty.) The recharge of the
battery should be done in any case if the voltage display (menu
"Control") is less than 5.8 V (Instrument will stop working at 5.5 V).
Sampling probe and hose
Depending on the frequency of use the probe and the hose must be
cleaned regularly, thus in order to prevent particles from lodging and
early ware due to corrosion.
The hose can be cleaned after all connections on the instrument and
the probe itself have been switched off (use warm water and then
blow out to dry)
Page 40
approx. 1500 mV
0 mV (+/- 30)
ecom-B