Thermo Fisher Scientific CyberScan PC 300 User Manual
Page 62
Instruction Manual PC 300
58
1 3 ADDENDUM 1 : CON D U CTIV ITY 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
μS
40.38 0.5048 38.04 0.4755
447
μS
225.6 0.5047 215.5 0.4822
1413
μS
744.7 0.5270 702.1 0.4969
1500
μS
757.1 0.5047 737.1 0.4914
8974
μS
5101 0.5685 4487 0.500
12,880
μS
7447 0.5782 7230 0.5613
15,000
μS
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
μS
50.50 0.6563
447
μS
300.0 0.6712
1413
μS
1000 0.7078
1500
μS
1050 0.7000
8974
μS
7608 0.8478
12,880
μS
11,367 0.8825
15,000
μS
13,455 0.8970
80 mS
79,688
0.9961