5
3.3 Temperature function and compensation:
1. ATC: Auto judgment of whether there is temperature probe and recognition of NTC30K
or PT1000. Push or to adjust the temperature within in ±5℃. At the same time,
push keys to back to the original value.
2. MTC: Enter MTC 25℃automatically when there is no temperature probe. Push
or to adjust the temperature. At the same time, push keys to back to the
default value 25.0℃.
3. Temperature compensation: Because the temperature of the to-be-tested solution may not
be 25℃, for standardization, the conductivity value of solution not at the temperature of
25℃will be calculated to that of solution at the temperature of 25℃. This is temperature
compensation.
4. According to the temperature coefficient required by the measurement, three kinds of
temperature compensation can be applied: Lin, nLin, and non compensation (0.00％). See
the setting method in 4.4.3, and the user can set as needed.
5. Temp. Coefficient (called as TC for short), the conductivity value of the solution will
increase as the temperature rises at a different rate. See the relations as follows:
C25 Conductivity at 25℃
Ct Conductivity at T℃Formula 1: Ct = C25 { 1+β( T – 25 ) }
T Temp. of the tested solution
βTemp. Coefficient Formula 2: β= ( Ct－C25 ) / { C25 ( T－25 )}
6. How to measure the TC of the tested solution: If the user wants to get a more accurate
value, the above formula can be applied to measure the TC of the tested solution and set
an appropriate TC on the machine. Take 0.01N Kcl as an instance, set the TC as non
compensation (0.00%) in the machine. Control the same tested solution respectively at
5℃and 20℃. The value 1413μS tested at C25 is just the conductivity of the solution at
25℃; and the value 1278μS tested at Ct is just the conductivity of the solution at 20℃.
According to formula 2, β＝1.91%.
3.4 Auto Read:
In the measurement mode, push to start up and push to read. Then, push
Enter to make the next measurement. Push or at any time will allow backing to
the measurement mode.
Auto Read symbol twinkles
for about 10 seconds.
Auto Read symbol stop twinkling
and a value will appear after the
measurement is stable.
Back to the measurement
Push or
