EUTECH INSTRUMENTS CD 650, Instruction Manual

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2. Conductivity Calibration Mode
2.1 Conductivity Calibration mode
This option allows you to select automatic or manual calibration standard. In the
automatic calibration mode, the meter automatically detects and verifies the
appropriate known calibration standards solutions before accepting these
particular calibration standards as one of its calibration values in a specific
measurement range.
Standard buffer values: 84.0 uS/ 1.413 mS/ 12.88 mS/
111.8 mS
In the manual calibration, non-standard calibration values can be used for
calibration. You can manually input the appropriate values as your desired
calibration standards in each specific range. The selected calibration standard
will be displayed at the bottom of screen (See Figure 3 below).
2.1.1 Conductivity calibration points
This option allows you to select single or multi point calibration. Single point
calibration refers to calibrating one conductivity value and uses it for the entire 5
conductivity ranges. In multi point calibration, you can calibrate one point in
each of the measuring ranges (up to 5 points). The selected calibration point will
be displayed in the bottom of screen. For example: If single point calibration is
selected it will display ‘SPC’ at the bottom of the screen, as shown in this
diagram:
Figure 29 : Calibration Standard & Point Indicato r
But if a multi-point calibration option (calibration for different ranges are
indicated in the Technical Specifications where calibration factors are applied
only to their respective ranges.
2.2 Cell constant
This option lets you adjust the cell constant of the conductivity cell that you are
using. Cell constant can be adjusted from 0.010 to 10.000. k
2.3 Normalization Temperature (
°
C)
This option will allow you to select a normalized temperature that the meter will
use to normalize its conductivity measurements to a standard temperature.
NOTE: The factory default value for normalization temperature is 25
°
C.
2.4 Linear Temperature Coefficient
The temperature coefficient is a value that reflects the degree to which the
conductivity is affected by temperature changes.
NOTE: Your meter is factory set to a temperature coefficient of 2.1% per
°
C.
Single point
calibration
Manual calibration
standard