wtw NitraLyt 700 IQ, Operating Manual, Page: 28 / 61

Calibration and measuring NitraLyt
®
700 IQ
4 - 8 ba75397d03 12/2004
4.1.5 Calibration procedure, 1 point standard (1)
General information The 1 point standard (1) 1-point calibration is carried out using one
standard solution. The procedure includes a conditioning process. The
conditioning takes 15 min and is important so the temperatures of stan-
dard solution and electrode can adjust to each other and a stable con-
centration can be reached at the electrode membrane. During the
conditioning process the remaining time is displayed on the screen.
The process cannot be shortened. By pressing
e
or
m
you cancel
the entire calibration and the old calibration data is used further. The
time required for the entire calibration is approx. 25 min.
Note
Determine the chloride content of the test sample (see section 4.2.1).
Activate the
Cl compens. function and adjust the chloride content (see
section 3.4)
The chloride content of the sample does not affect calibration but the
following measurement.
Operating steps during
calibration
Display Explanation
Unscrew protective hood.
Clean and rinse sensor incl. elec-
trode and protective hood, then
reassemble them. Prepare the sensor as described.
After completing the operating
steps confirm with
g
.
Cal.: 1 POINT STANDARD (1)
Have standard ready for calibra-
tion You can use any standard solu-
tion.
The nitrate value should be as
close to the value expected for
the test sample as possible.
Confirm with
g
.
Immerse sensor in standard.
Observe minimum immersion
depth (70mm). Confirm with
g
.
Select standard concentration
(5 / 50 / 500) mg/l NO3-N
Enter the nominal concentration
of the calibration standard and
confirm with
g
.
Subsequently wait for the condi-
tioning time of 15 minutes to
expire. The remaining time is
shown on the display.