LTH Electronics MXD70 Series User Manual

Channel Calibration
- 22 -
MXD70 Conductivity Setup and
Operating Guide
Channel Calibration
Calibration by Comparison with Another Instrument
This can provide the easiest method for in-situ calibrations but has the disadvantage of only being able
to check a single measurement point. LTH recommends this method for ALL pure water (<10 μS/cm)
calibration checks and has developed a portable system specifically for this purpose. As
measurements are made by comparison of the readings taken in the same solution, temperature
effects are less critical. However, it is essential that settings for temperature compensation are the
same on both instruments. For more information on the measurement of pure water refer to
Appendix A - Ultra Pure Water (page 33).
Calibration of the Cell Constant
LTH conductivity cells are supplied with a nominal cell constant value, e.g 0.1, 1.0. The actual cell
constant could be up to ±2% from this value. It is possible for LTH to measure the actual cell constant
of each cell and provide traceable certification. The user can then program this value into the
instrument eliminating the errors contributed by manufacturing variations in the cell geometry. Use
the cell constant menu in the channel setup menu to enter the specified cell constant.
Table of calibration resistance values
Conductivity
Display
Reading
Nominal cell
constant
K=0.01
Nominal cell
constant
K=0.10
Nominal cell
constant
K=1.00
Nominal cell
constant
K=10.0
Resistivity
Display
reading
0.050 μS/cm 200K
20.00 M-cm
0.100 μS/cm 100K
10.00 M-cm
0.200 μS/cm 50K
5.000 M-cm
0.500 μS/cm 20K
2.000 M-cm
1.000 μS/cm 10K 100K
1.000 M-cm
2.000 μS/cm 5K 50K
500.0 K-cm
5.000 μS/cm 2K 20K
200.0 K-cm
10.00 μS/cm 1K 10K 100K
100.0 K-cm
20.00 μS/cm 500R 5K 50K
50.00 K-cm
50.00 μS/cm 200R 2K 20K
20.00 K-cm
100.0 μS/cm 100R 1K 10K 100K
10.00 K-cm
200.0 μS/cm 500R 5K 50K
500.0 μS/cm 200R 2K 20K
1000 μS/cm 100R 1K 10K
2.000 mS/cm 500R 5K
5.000 mS/cm 200R 2K
10.00 mS/cm 100R 1K
20.00 mS/cm 50R 500R
50.00 mS/cm 20R 200R
100.0 mS/cm 10R 100R
200.0 mS/cm 50R
500.0 mS/cm 20R
1000 mS/cm 10R
This list of calibration resistance values will allow the user to check or modify the calibration of the
instrument. Temperature compensation MUST be turned off during the test or adjustment.

LTH Electronics MXD70 Series Specifications

General

Brand	LTH Electronics
Model	MXD70 Series
Category	Measuring Instruments
Language	English