Instruction Manual
PC 300
58
13 AD DEN DUM 1: COND UC TIVITY TO TDS
CONVERSION FACTORS
1.
Factor
– the conductivity to ppm TDS conversion factor. Multiply conductivity by this
factor to get ppm TDS for the type of TDS reading needed.
2.
442
– a formulation that most closely represents the conductivity to ppm relationship, on
average, for naturally occurring fresh water.
3.
TDS Your Material
– These columns are for you to write in your application-specific
conductivity-to-ppm values and conversion factors for future reference.
Factor = Actual TDS ÷ Actual Conductivity @ 25 °C
TDS KCl
TDS NaCl
Conductivity at 25 °C
ppm Value
Factor
ppm Value
Factor
84
µ
S
40.38
0.5048
38.04
0.4755
447
µ
S
225.6
0.5047
215.5
0.4822
1413
µ
S
744.7
0.5270
702.1
0.4969
1500
µ
S
757.1
0.5047
737.1
0.4914
8974
µ
S
5101
0.5685
4487
0.500
12,880
µ
S
7447
0.5782
7230
0.5613
15,000
µ
S
8759
0.5839
8532
0.5688
80
mS
52,168
0.6521
48,384
0.6048
TDS 442
TDS Your Material
Conductivity at 25 °C
ppm Value
Factor
ppm Value
Factor
84
µ
S
50.50
0.6563
447
µ
S
300.0
0.6712
1413
µ
S
1000
0.7078
1500
µ
S
1050
0.7000
8974
µ
S
7608
0.8478
12,880
µ
S
11,367
0.8825
15,000
µ
S
13,455
0.8970
80 mS
79,688
0.9961