Model C8
Portable Conductivity/TDS Meter (Version 351) .
CALIBRATION: (SN 1 up).
The C8 meter is factory calibrated with a 1413 µ S/cm solution and does not need calibration
during normal operation.
Before recalibrating the C8 meter please note:
Incorrect readings will result if the electrodes are dirty, the unit has not been allowed to adjust to the
temperature of the sample, the battery is flat or the reading is below 2 µ S/cm.
Do not try to recalibrate if the reading is within +/- 5% of the correct reading.
If it is necessary to re-calibrate the meter, proceed as follows:
1) Remove the rear cover.
2) Fill the cup with a known conductivity solution.
3) Wait 5 minutes. This allows the temperature sensor to reach the correct temperature.
4) Empty the cup and refill with new test solution.
5) Press the “Push to read” switch for 2 seconds.
6) If the reading is incorrect press the “Set” button on the back of the C meter for 5 seconds.
This will enable the calibration function.
7) Press the “Up” or “Down” button to calibrate the meter.
8) Press the “Set” button to save the setting.
9) Discard the used test solution.
IMPORTANT: If the C8 meter is recalibrated by the customer then the calibration certificate
supplied with the meter by JM Electronics becomes invalid!
OPERATION.
Press “Push to read” until the display switches on.
The meter will auto-range and display “µS =0.0” and TDS=0.0”
Pour liquid into the cup. The Meter will display “Ranging wait”.
After a few second the conductivity reading in µS /cm as well as TDS will be displayed.
Alternatively, pour the liquid into the cup and press “Push to read”.
The Meter will display “Ranging wait”.
After a few second the conductivity reading in µS /cm as well as TDS will be displayed.
The meter will switch off after 40 Seconds, or if the “Push to read” button is pressed for 3 seconds.
If the reading exceeds 10’000 µS /cm the “Over range” message will be displayed.
To switch off, press “Push to read” until the display switches off.
CARE OF THE C8 uS/TDS METER.
1) Never dip meter in liquids as damage to the electronics will result.
Should liquid get into the meter, open the bottom cover, remove the battery and let the meter
dry. If the liquid is corrosive, rinse inside of meter with distilled water and let the meter dry.
Use a hairdryer or compressed air to dry the meter. It is imperative that the meter is dried out
immediately, otherwise irreparable damage will result!
2) Always rinse cup with distilled or clean water before and after use.
When measuring hot liquids, cool sample to below 60 Degrees Celsius before pouring into cup.
3) Deposits of any kind on the electrodes will give a false reading. Clean the cup with fine sand paper
and wipe with methylated spirits. Do not use other solvents.
4) Use a damp cloth wetted with dishwashing liquid to clean the meter, or wipe with methylated spirits
or benzene.
DO NOT USE ANY OTHER SOLVENTS. THEY MAY ATTACK THE CLEAR FACE OF
THE METER.
6) Replace the battery if the “Battery Low” message is displayed.
Check that the new battery terminals fit properly. If the connections do not fit properly use a
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