USP 645 - Easy and accurate conductivity calibration with an insacal master meter

With an INSACAL master meter you get a very flexible calibration tool. You can calibrate by closed loop procedures or in an open beaker. This allows you to choose whether your cell is calibrated on-site, in-situ or not. If customers use a "Master Meter" these need to be calibrated.

INSACAL master meters are always delivered with a closed sensor to avoid influence from the surroundings. The transmitter settings can be protected with password to avoid unintended changes in settings e.t. cell constant.

Download the Insacal Conductivity Master Meter Data Sheet
http://www.insacal_general_specifications.pdf 

Standard accuracy

Transmitter: Ut
Ambient temperature Uta
Cell constant determination Ucc

0.5% Distribution: square
0.05% per C Distribution: square
0.4% when determined with 
a standard solution.
1% Interval 1.3 to 99.9 S/cm
when determined by comparison
0.5% Interval 0.1 to 239ms/cm
when determined by comparison
Confidence interval: 2.
In short: )last significant digit +10%).
Confidence interval: 2

Total: ( etc etc etc.................................................................................................)
e.g.
Master displays 100,0uS/cm
Ambient temperature = 30C
Cell constant determined by a 100uS/cm standard solution (Ucc = 0.36%)
Coverage factor = 2 (level of confidence of approximately 95%)
Total uncertainty = 0.75%

Enhanced accuracy

The indicator/transmitter is calibrated using a high precision resistor prior to the loop-calibration.
e.g.
Master displays 100,0uS/cm
Ambient temperature = 30C
Cell constant determined by a 100uS/cm standard solution (Ucc = 0.36%)
Coverage factor = 2 (level of confidence at approximately 9%%)
Standard resistor acc = 0.05%. Distribution: square
Calibration of standard resistor: 100ppm Confidence interval: 2.
Temperature influence of standard resistor 15ppm Distribution: square
Total uncertainty = 0.37%