LaMotte Multi-Range Conductivity Meter 1704 DA-LR User Manual
Page 5
CONVERSION TABLE
FOR CHANGING CONDUCTIVITY* INTO SALINITY
CONDUCTIVITY
SALINITY
0°C
5°C
10°C
15°C
20°C
25°C
30°C
0/
00
1,200
1,400
1,500
1,700
2,000
2,200
2,400
1
2,220
2,500
2,900
3,300
3,700
4,100
4,500
2
3,200
3,700
4,200
4,700
5,300
5,900
6,500
3
4,100
4,700
5,400
6,100
6,900
7,600
8,400
4
5,000
5,800
6,600
7,500
8,400
9,300
10,300
5
5,900
6,800
7,900
8,800
9,900
11,000
12,100
6
6,700
7,800
8,900
10,100
11,300
12,600
13,900
7
7,600
8,800
10,100
11,400
12,800
14,200
15,700
8
8,500
9,800
11,200
12,700
14,200
15,800
17,400
9
9,300
10,800
12,300
13,900
15,600
17,300
19,100
10
10,200
11,800
13,400
15,200
17,000
18,900
20,800
11
11,000
12,800
14,500
16,400
18,900
20,400
22,500
12
11,900
13,700
15,600
17,600
19,700
21,900
24,100
13
12,600
14,600
16,700
18,900
21,100
23,400
25,800
14
13,400
15,600
17,800
20,100
22,400
24,900
27,400
15
14,200
16,400
18,800
21,200
23,800
26,400
29,100
16
15,000
17,400
19,800
22,400
25,100
27,800
30,700
17
15,800
18,300
20,900
23,600
26,400
29,300
32,300
18
16,600
19,200
21,900
24,800
27,700
30,700
33,900
19
17,400
20,100
23,000
25,900
29,000
32,200
35,500
20
18,200
21,100
24,000
27,100
30,300
33,600
37,000
21
19,000
22,000
25,100
28,300
31,600
35,000
38,600
22
19,800
22,900
26,100
29,400
32,900
36,500
40,100
23
20,600
23,800
27,100
30,600
34,200
37,900
41,700
24
21,400
24,700
28,100
31,700
35,400
39,300
43,200
25
22,100
25,500
29,100
32,800
36,700
40,700
44,800
26
22,800
26,400
30,100
33,900
37,900
42,100
46,300
27
23,600
27,300
31,100
35,100
39,200
43,500
47,800
28
24,400
28,100
32,100
36,200
40,400
44,800
49,400
29
25,200
29,000
33,100
37,300
41,700
46,200
50,900
30
26,000
30,000
34,100
38,500
43,000
47,600
52,400
31
26,800
30,900
35,100
39,600
44,200
49,000
53,900
32
27,500
31,700
36,100
40,700
45,400
50,300
55,400
33
28,300
32,600
37,100
41,800
46,700
51,700
56,800
34
29,100
33,500
38,100
42,900
47,900
53,000
58,300
35
29,700
34,200
39,000
44,000
49,100
54,400
59,800
36
30,500
35,100
40,000
45,100
50,300
55,700
61,300
37
31,200
36,000
41,000
46,200
51,500
57,100
62,800
38
32,000
36,800
41,900
47,200
52,700
58,400
64,200
39
32,700
37,700
42,900
48,300
53,900
59,700
65,700
40
*Conductivity values are given in micromhos/cm.
Data derived from the equation of P.K. Weyl, Limnology and Oceanography; 9,75 (1964).
8
GENERAL OPERATING PROCEDURE
1.
Plug the probe into the BNC receptacle (top right corner of panel).
2.
With the control knob in the “OFF” position, the meter pointer must
balance at zero. The mirror-faced scale insures accurate readings by
eliminating errors due to parallax problems which would otherwise occur
when the indicating needle and the scale are not properly aligned by the
reader’s eye.
3.
Switch the control knob to the “BAT. CK.” position. The meter should
indicate greater than 80 micromhos/cm. If not, replace the battery (see
instructions for battery replacement, page 8).
4.
Set the “TEMP” knob at 25°C, the Range Selector at “X10”, and switch
the control knob to the “CAL” position. The meter should indicate exactly
100 micromhos/cm. If not, carefully adjust by using the “STD” knob.
SAM PLE MEA SURE MENT - METHOD A
NOR MAL AC CU RACY WITH TEM PER A TURE COM PEN SA TION
5.
Use the thermometer (1066) to measure the sample water temperature in
degrees centigrade. Set the “TEMP” knob at this figure.
6.
Immerse the probe in at least a” of solution. Make sure all bubbles are
removed from the probe.
7.
Switch the control knob to the “ON” position and the range selector to
either “X1”, “X10”, “X100”, or “X1000”. Read the conductivity directly
from the meter face. For the best accuracy, select the range which gives
readings as close to mid-range of the scale as possible. Multiply the reading
from the meter face by the appropriate factor. The probe should not be in
contact with any surface other than the solution under test.
8.
After completing the conductivity measurement, switch the control knob to
the “OFF” position. Rinse the probe thoroughly with water, preferably
deionized water, and air dry.
5