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After opening the menu “Calibrate“, you are asked to apply the offset test gas. The third line of the
display shows the test gas concentration as set in the “Offset Gas“ menu (see Section 7.1.3). Please
calibrate using the same/a similar flow rate as in your process measurement situation. Confirming with
“OK“ leads to the menu “Stability“. The second line contains the set test gas concentration (“Targ.“),
the third line the measured concentration (“Actu. “) using the current (unchanged) calibration. Before
continuing, wait for a sufficient running-in time to evacuate possible disturbing gases from the device.
Only continue if the value of the actually measured concentration reaches a final value (you might ob-
serve some signal noise around a constant value). To start the calibration sampling, select “OK“ and
press <ENTER>. The sampling phase of 10s is started. Based on the average measured concentra-
tion, the new offset is determined such that the currently measured (and calibrated) value accords with
the given test gas concentration within the specifications of the device. Repeat the calibration in case
the measured concentration after calibration is not in agreement with the test gas concentration. By
selecting “ESC“ and pressing <ENTER>, the offset calibration is repeated. With “OK“ the calibration is
confirmed as correct and the new offset value is saved.
The following menu offers the option to proceed with the gain calibration. Choosing “YES“ leads to
the gain calibration menu described below. It is highly recommended to select “NO“ at this point. The
gain value is very stable over time. Faulty gain calibration may worsen the device’s performance. After
quitting the calibration, you are asked to apply process gas again, giving you time to restore your typical
process measurement environment while error warnings are deactivated and relays stay frozen.
7.1.6 Gain Calibration
Save Calib.
Targ. 100 .00
Actu. 100 .00
[%] ESC /OK
Gain Calib.
Apply Gas
100.00
[%] ESC/OK
Stability
Targ. 100 .00
Actu. 99 .98
[%] ESC /OK
Sampling 10s
for Gain
Calibration
Please Wait
Gain
Calibration?
------------
YES/NO
Apply
Process Gas
Actu. 100 .00
ESC/OK
Figure 7.5: menu path of the gain calibration
The menu structure is designed such that the gain calibration procedure is only accessible after an
offset calibration. The steps of the gain calibration correspond to the offset calibration described above
(of course now using a different gas concentration, as set up in the Gain Gas menu, see Section 7.1.4).
Again, please remember to wait for sufficient running-in time to evacuate possible disturbance gases.
The gain calibration can be canceled in any sub-menu by selecting “ESC“. If gain calibration is can-
celed, the previous slope of your calibration line remains unchanged.
7.2 Mapping of Analog Output
By default, the (analog) output range of a measured variable is preset to the measuring range (see
nameplate). If required, this output range can also be configured to other start and end values.
File name:
FTC320Ex Operating Manual_1.09KD201009MPO3V04.pdf
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