Dokument
UMA0132
Rev
3
Sid
15 (16)
Note 1
. Any probe is out of range. Occurs, for instance, during over exposure of CO
2
sensor, in which
case the error code will automatically reset when the measurement values return to normal. Could
also indicate the need of zero point calibration. A background calibration using push button function
”bCAL” will cure this error (a more exact zero calibration using ”CAL” may be performed later, if
required). If the CO
2
readings are normal, and still the error code remains, the temperature or relative
humidity sensor can be defect or the connections to these are broken.
Please remark
:
If several errors are detected at the same time the different error code numbers
will be added together into one single error code!
Maintenance
The
aSENSE
mIII
is basically maintenance free. An internal self-adjusting calibration
function takes care of normal long term drift associated to the CO and CO
2
sensor.
To secure the highest accuracy, a time interval of five years is recommended
between calibrations, unless some special situations have occurred. A zero
calibration can be performed by use of the push button functions, or for a complete
overview by use of a PC together with the
UIP software version 4.3
(or higher). This
software can be free downloaded from
. A RS232-cable is needed
and can be ordered from SenseAir. The cable is to be connected to the UART port
slide connector
(Fig 10).
For change of control parameters and re-calibration (CO
2
and CO) this PC tool has to be used. The check can be done on site without
interfering with the ventilation system.
DI1
~
+
Figure 12. The aSENSE mIII
printed circuit board with the connection terminal area is enlarged. The
terminal DI1 may be used for forced ventilation. If the sensor has a heater it is connected to
and
.
~
+
