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4. TDS Calibration
4.1 Calibration Procedure
1.
Switch the
901-C
on and select TDS plus Temperature mode (section 2).
2.
Plug the TDS sensor into the
Cond / TDS
socket. If a k=10 or k=0.1 sensor
is being used, ensure that it has been correctly selected (see section 8). The
Temperature sensor is not required, as Automatic Temperature
Compensation for TDS is done via the TDS Sensor.
3.
Rinse the TDS electrode in distilled water. Shake off as much water as
possible. Blot the outside of the electrode dry. DO NOT BLOT THE
ELECTRODE SURFACES.
4.
Zero Calibration
Allow the TDS sensor to dry in air.
When the reading has stabilised at or near Zero, press and hold the
for 1 second.
The
∗∗
will not be removed after a zero calibration.
5.
Standard Calibration
Allowable TDS standards are listed in the specifications in section 1.5, and
should be selected according to your range of interest.
Place the electrode into a sample of TDS standard so that it is immersed at
least to the vent hole in the body.
DO NOT
place the electrode directly into the bottle of standard. Discard the
used sample of standard after use. It is advisable to use a narrow sample
vessel to minimise the use of standard solution.
When the reading has stabilised, press and hold the
key for 1 second
to calibrate.
The
∗∗
will now be replaced by a decimal point if calibration was successful.
6.
The
901-C
is now calibrated for TDS and is ready for use in this mode.
Discard the used samples of standard.