Menu Overview and Explanations Installation and Operation Manual - COMTEC
®
/
OXITEC
®
DustEx
2 Doc.-ID: COM_OXI_Dust_11022020
4.2.6 COe Measuring Ranges (Scaling)
Figure 24 - COe Measurement Ranges
The COe Measuring range is linearly scaled and converted to a
linear current output (0/ 4-20 mA).
The parameter „COe Measuring range from“ is the start value of
the COe range, leading to an output of 4,00 mA.
„COe measuring range to" is the end value of the COe range,
leading to an analogue output of 20,00 mA.
If a measured value is lower than the start value of the COe
measuring range, the current output signal drops to 3,60 mA.
(If the current output is set to 0- 20mA the output is 0 mA)
If the measured COe value is higher than the end value of the COe
measuring range end, the analogue output rises to 20,40 mA.
If during normal operation the measured COe
value is under, or
over the programmed measuring range, an error message
appears on the display (in measuring mode).
4.2.7 COe Sensor Calibration values
The COe sensor calibration values are sensor specific. Every COe sensor has a Test Certificate in which the
calibration values offset, alpha, beta, gamma, delta, COe heater resistance (RH
0
) and SO2 Correction Value are
noted. The Test Certificate is attached to the probe or measuring cell on delivery. After a calibration, these values are
updated.
4.2.8 Time per test gas apply
Here the maximum duration of time for the application of test gas or test air is set. If sensor stability is not reached
within the maximum time, the following error message is displayed: "O
2
Sensor calibration failed - O
2
sensor
signal instable" resp." COe Sensor calibration failed - COe sensor signal instable". This problem can be offset
by setting a longer duration. The factory setting for maximal duration is 10 Minutes. If necessary, the time can be
adjusted between 5 minutes and 30 minutes.
4.2.9 Delay time to process
Here the delay time showing the last measured value from the data storage is frozen after test air or test gas has
been applied (only when "Meas. value hold on cal. is set to on) This value also sets the time for showing the trend
representation on the display after test air or test gas application after a sensor calibration is set.
4.2.10 Pre-purge time
The pre-purge time defines the duration of time the sensors flushed are with test air / test gas 1 before a 2-point
calibration of the COe or O2+Coe sensors. By default, the pre-purge time is switched off.
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