Hanna Instruments HI 4101 - Manual (Page 15)

15
Typical calibration curve for HI 4101 Ammonia ISE
•
Standards should bracket the measurement range of
interest and differ from each other by a factor of 10 in
the linear regions.
•
Standards and solutions should be at the same tem-
perature. 2 mL of ISA is added to each 100 mL of
sample and standard. A color change should occur to
indicate the ISA has been added.
•
Protect these solutions from loss of dissolved gas by
covering and using promptly.
3) Follow section VII; General Guidelines to optimize test
set-up.
4) During calibration it is best to start with lower concen-
tration samples first. Wait for a stable reading before
reading/recording values.
5) To prevent carry over and contamination of samples,
rinse sensors with deionized water and blot dry be-
tween samples.
6) Between measurements suspend sensor tip in a small
sample of NH
3
Conditioning solution;
HI 4001-45. Rinse body with deionized water and
blot dry before placing in next sample.
Typical Linearity for HI 4101 Electrode
-300
-250
-200
-150
-100
-50
0
50
0 1 2 3 4 5 6
-Log of [M ]
m
V