26
Instruction Manual Mi170 Bench Meter
EC SOLUTIONS TEMPERATURE DEPENDENCE
The conductivity of an aqueous solution is a measure of its ability to carry an electrical
current by means of ionic motion.
The conductivity invariably increases with increasing temperature.
It is affected by the type and number of ions in the solutions and by the viscosity of
the solution itself. Both parameters are temperature dependent. The dependency of
conductivity on temperature is expressed as a relative change per Celsius degrees at
a particular temperature, commonly as %/°C.
The following table lists the temperature dependence of Milwaukee EC calibration
solutions.
ºC
ºF
MA9060
(µS/cm)
MA9061
(µS/cm)
MA9063
(µS/cm)
MA9064
(µS/cm)
MA9065
(µS/cm)
MA9069
(µS/cm)
0
5
10
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32.0
41.0
50.0
59.0
60.8
62.6
64.4
66.2
68.0
69.8
71.6
73.4
75.2
77.0
78.8
80.6
82.4
84.2
86.0
87.8
7150
8220
9330
10480
10720
10950
11190
11430
11670
11910
12150
12390
12640
12880
13130
13370
13620
13870
14120
14370
776
896
1020
1147
1173
1199
1225
1251
1278
1305
1332
1359
1386
1413
1440
1467
1494
1521
1548
1575
64
65
67
68
70
71
73
74
76
78
79
81
82
84
86
87
89
90
92
94
48300
53500
59600
65400
67200
68500
69800
71300
72400
74000
75200
76500
78300
80000
81300
83000
84900
86300
88200
90000
65400
74100
83200
92500
94400
96300
98200
100200
102100
104000
105900
107900
109800
111800
113800
115700
117700
119700
121800
123900
2760
3180
3615
4063
4155
4245
4337
4429
4523
4617
4711
4805
4902
5000
5096
5190
5286
5383
5479
5575
7
www.milwaukeeinst.com
OPERATIONAL GUIDE
INITIAL PREPARATION
Plug the 12 VDC adapter into the power supply socket.
Connect the EC/TDS probe to the 7-pin connector. Make sure the probe sleeve is
properly inserted and tighten the threaded ring.
Turn the instrument on by pressing ON/OFF. All LCD tags are displayed and a beep is
heard while the instrument performs a self test.
The reference temperature is displayed on the LCD for a few seconds and the instru-
ment enters in the same range as it was at power off.
CONDUCTIVITY MEASUREMENTS
Make sure the instrument has been calibrated before taking conductivity measurements.
• Immerse the probe into the solution to be tested. The sleeve holes must be com-
pletely submerged. Tap the probe repeatedly to remove any air bubbles that may
be trapped inside the sleeve.
• If necessary, press the RANGE/FIXED key until the display changes to EC mode.
• The conductivity value is displayed on the primary LCD and the temperature on the
secondary LCD, along with the reference temperature.
Notes:
• If the reading is out of range, the closest full-scale value (200.0 for MTC/ATC mode
or 500.0 for uncompensated conductivity) will be displayed blinking.
• If SHIFT&FIXED keys are pressed to freeze the LCD range and the reading goes out
of range, the full-scale value of the frozen range will be displayed blinking.
The EC reading is affected by temperature. Three options for temperature compensation
are available in EC measurement mode.
