Myron-l TH1 User Manual download pdf (Page 31)

Users wanting to measure natural water based solutions to 1% would

have to alter the internal compensation to the more suitable preloaded

“442” values, or stay close to 25°C. Users who have standardized to KCl-

based compensation may want to stick with it, regardless of increasing

error as you get further from 25°C. The TechPro II will provide the

repeatability and convertibility of data necessary for relative values for

process control.

E. Other Solutions

A salt solution like sea water or liquid fertilizer acts like NaCl. An internal

correction for NaCl can be selected for greatest accuracy with such

solutions. Many solutions are not at all similar to KCl, NaCl or 442. A

sugar solution, or a silicate, or a calcium salt at a high or low temperature

may require a value peculiar to the application to provide readings close

to the true compensated conductivity.

Clearly, the solution characteristics should be chosen to truly represent

the actual water under test for rated accuracy of

1%. Many industrial

applications have historically used relative measurements seeking

a number to indicate a certain setpoint or minimum concentration or

trend. The TechPro II gives the user the capability to collect data in “KCl

conductivity units” to compare to older published data, as in terms of

NaCl or 442, or as appropriate.

Chart 2

(1)%

(2)%

0 5 10 15 20

30 35 40 45 50

Temperature

NaCl error with KCl tempco

442 error with KCl tempco

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 43 44

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Myron-l TH1 User Manual Page 31