ROTRONIC CF5 - Manual (Page 5)

Dokument
Rev
Page
5 (7)
Remark: If several errors are detected at the same time the different error code numbers will be
added together into one single error code!
PLEASE NOTE! The sensor accuracy is defined at continuous operation (at
least 3 weeks after installation)
Maintenance
The CF5 is basically maintenance free. An internal self-adjusting calibration function
takes care of normal long term drift associated to the CO
2
sensor. To secure the
highest accuracy, a time interval of five years is recommended between CO
2
calibrations, unless some special situations have occurred. A zero calibration can be
performed by use of pure nitrogen or air that has passed through a chemical
absorber and a PC together with the UIP software version 4.3 (or higher). The
Service bag can be used to produce carbon dioxide free air. The software can be
free downloaded from www.rotronic.com. The RS232-cable and the zero calibration
bag can be ordered from Rotronic. The cable is to be connected to the UART port
slide connector (see Fig. 5). For change of control parameters and re-calibration
(CO
2
and temperature) this PC tool has to be used. The check can be done on site
without interfering with the ventilation system.
This is for sensors with measuring ranges between 0-3000 ppm and 0-4%:
When a zero calibration shall be executed a plastic tube with 2,2 mm outer diameter
and 0,8 mm inner diameter shall be inserted in marked holes of the sensor. Plastic
tubing is connected to the tube. The gas flow should be between 0,3 and 1,0 l/min.
Figure 2 Part of the PCB with holes for gas inlets marked.
Duct mounting
If for some reason the printed circuit board (PCB) needs to be removed, special
precaution must be taken in order not to damage the temperature probe in the
sampling tube. When putting the PCB back in the protective housing, the probe must
be gently positioned in the sampling tube.
Gas inlet
Gas inlet