Hanna Instruments HI 8043 - Manual (Page 8)

15 14
The temperature scale should be calibrated
at least every 3 months or whenever the
readings are in doubt.
• Immerse the bottom
60 mm (2.4") of the probe
in a beaker containing wa-
ter.
• Switch the knob to the
"°C" position and agitate
the water for at least 10
minutes to reach the ther-
mal equilibrium between the
probe and water.
• Using a ChecktempC or
another thermometer with
a resolution of 0.1°C,
check the temperature
of the water (e.g. 20.0°C).
• Adjust the "°C" trimmer until the display
shows the noted temperature.
Note: It is important to ensure the thermal
equilibrium between probe and water,
because 1 degree of temperature
difference entails an error of ±3% in
dissolved oxygen measurement.
TEMPERATURE CALIBRATION
OFF O
2
STB °C
°C
Table 3
Correction for salinity effect
°C
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Quantity to be
subtracted per mg/l
of NaCl
0.0892
0.0861
0.0830
0.0802
0.0779
0.0749
0.0724
0.0701
0.0678
0.0657
0.0637
0.0618
0.0599
0.0582
0.0565
0.0549
0.0533
0.0519
0.0505
0.0491
0.0478
0.0466
0.0454
0.0442
0.0431
0.0421
Quantity to be
subtracted per mg/l of
NaCl
0.0410
0.0400
0.0391
0.0382
0.0373
0.0364
0.0356
0.0348
0.0341
0.0333
0.0326
0.0319
0.0312
0.0306
0.0299
0.0293
0.0287
0.0281
0.0275
0.0270
0.0265
0.0259
0.0254
0.0249
0.0244
°C
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
SLOPE
ZERO
°C