15
1.3 Rinse the working and reference electrode with distilled
water and immerse the two electrode in sample to be measured.
1.4
Allow sufficient time for the display to stabilize. The
instrument will display the millivolt value of the sample.
If Er5 is displayed, the millivolt value measured is out of the
+/-1999.9 mV range. The instrument will display the correct value
once the input millivolt is brought within range. It is not necessary
to CLEAR the instrument.
1.5 The ATC/Temp probe can be used to measure the sample
temperature as required.
ION MEASUREMENTS
The following rules should be observed in order to make accurate
determinations of ion concentration.
Rule A. All hardwares used to handle ion standards and samples should
always be cleaned with deioned water.
Rule B. THe standard solutions and samples should always be at the
same temperature.
Rule C. A magnetic stirrer should be used for all measurements of
standards and samples.
Rule D. Study the instruction manual of the ION sensor carefully to
make sure that the proper ionic strength adjuster and/or pH
adjuster is used.
1.1 Connect the ION sensing electrode to the BNC connector and
the reference electrode to the REF pin connector.
1.2 Prepare 2 standards 1 decade apart. The concentration of the
sample should be within the range of the 2 standards. The 2
standards can be of any concentration unit such as ppm, mg/l
or M.
1.3 Rinse the electrode with the dilute standard or de-ionized
water and immerse the electrodes in the dilute stanard 1.
1.4 Press Mode key to enter into ION mode. The LCD display
