YSI IQ S ENSOR N ET VARiON Plus 700 IQ - Manual (Page 8)

Overview VARiON
®Plus
700 IQ
1 - 4 ba76000e01 01/2012
Calibration free
operation
The VARiON
®Plus
700 IQ combination sensor is immediately ready to
measure after being equipped with electrodes. For precise
measurements, it is only necessary to adjust the electrodes to the
sample matrix ("matrix adjustment"). In the recommended application
(see section 1.3 R
ECOMMENDED FIELDS OF APPLICATION ), the measuring
characteristics of the electrodes remain stable for their entire service
life. Thus, calibration is no longer required.
Possible changes of the sample matrix can be determined by
occasional comparison measurements (e.g. photometer) and
compensated for by a new matrix adjustment. The sensor does not
have to be taken out of the sample for this.
Shielding of the
VARiON
®Plus
700 IQ
The VARiON
®Plus
700 IQ combination sensor and the corresponding
electrodes in conjunction with the IQ S ENSOR N ET
system form a
measuring system that is protected to a high degree against low and
high frequency interference as well as against the indirect effects of
lightning strikes.
1.3 Recommended fields of application
The VARiON
®Plus
700 IQ combination sensor is a sensor for the online
determination of ammonium ions and/or nitrate ions in water / waste
water applications. It supplements D. O. measurement in the aeration
tank of waste water treatment plants and enables an efficient process
control of nitrogen removal.
Note
More detailed information on measuring with ion sensitive electrodes is
given in the YSI primer, I
ON SELECTIVE MEASUREMENT IN ONLINE
ANALYSIS .