Triplett CD100 User manual

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User Manual
CD100
Conductivity / TDS / Salinity / Temperature Meter
5 Commonwealth Ave5 Commonwealth Ave
Woburn, MA 01801Woburn, MA 01801
Phone [phone]Phone [phone]
TollToll Free 1-800-517-8431Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com

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Introduction
Thank you for selecting the Triplett CD100 Conductivity/Total Dissolved
Solids (TDS) / Salinity meter. With the CD100’s dynamic cell-constant
technology it is possible to measure a wide range of Conductivity, TDS,
and Salinity with the same electrode. Careful use and maintenance
provide years of reliable service.

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Description
METER DESCRIPTION
1. Battery compartment cap
2. LCD Display
3. MODE / HOLD button
4. CAL / RECALL button
5. ON/OFF button
6. Electrode collar
7. Conductivity Electrode
LCD DISPLAY
1. Bar graph reading
2. Measurement Units
3. Main Display
4. RENEW Indicator
5. HOLD Indicator
6. RANGE Calibration
Indicator
7. Low Battery Indicator
8. Temperature Display

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Powering On
The CD100 uses four (4) CR2032 Lithium Ion Batteries (included). If the
batteries are weak, the ‘Low Battery’ indicator appears on the LCD.
Press the ON/OFF key to turn the CD100 on or off. The auto power off
feature shuts the CD100 off automatically after 10 minutes of inactivity to
preserve battery life.
Getting Started
 Remove the cap from the bottom of the CD100 to expose the
conductivity electrodes.
 Before the first use or after storage, rinse the electride in water
and dry.
 For best results, calibrate for conductivity with a standard in the
expected range of the sample. For maximum accuracy calibrate from
low conductivity value standards to high value standards.
 Store dry.

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Measurement Procedure
Sample Preparation:
1. For Conductivity, TDS or Salinity place the test
sample in a sample cup with enough depth (2.5cm
minimum) to cover the electrode. Stir the solution to
remove any air bubbles.
Measurement:
1. Press the ON button. ( and then “SELF CAL” will appear in the
display during the turn-on diagnostics)
2. Depress and hold the MODE/HOLD key to scroll to the desired
measurement mode.
3. Insert the electrode into the sample making sure that the electrodes
are completely submersed.
4. Slowly stir the solution with the electrode to remove air bubbles.
5. The meter will auto-range to the proper range and then display the
reading.

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Changing Measurement Function
The meter can be set to measure Conductivity, TDS or Salinity.
To change the mode:
1. Press and Hold the MODE/HOLD button for 2 seconds and the
display will begin to scroll through the units.
µS (Conductivity); ppm S (Salinity); ppm (TDS); mg/l (TDS);
Note: The “HOLD” function cannot be on when changing the
measurement function. If “HOLD” is displayed in the lower left corner of
the display, briefly press the MODE/HOLD button to turn it off.
2. When the desired units are displayed, release the MODE/HOLD
button.
TDS Compensation Ratio
The TDS value is determined by multiplying a conductivity reading by a
known ratio factor. The meter allows for selecting a conversion ratio in
the range of 0.40 to 1.00. The ratio varies with the application, but is
typically set between 0.50 and 0.70.
Note: The stored ratio will briefly appear in the lower temperature
display when the meter is first turned on, or when changing
measurement function to TDS.
Note: In the Salinity mode the ratio is 0.40 to 0.60 auto.
To change the ratio, while in the TDS measurement mode (ppm or mg/l):
1. Press and release the CAL/RECALL button twice in
succession. The stored ratio will appear in the
display.
2. Press the MODE/HOLD button to increase the ratio value in steps of 0.01.
3. When the desired ratio is displayed, press and
release the CAL/RECALL button to store the
value and return to the normal mode.
4. If no buttons are pressed for 5 seconds, the
meter returns to measure mode.

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Storing Readings
1. Press the MODE/HOLD button to store a reading.
The storage location number will be displayed on
the lower display, while the main display shows
the stored reading. The meter will enter the HOLD
mode and the “HOLD” indicator will appear.
2. Press the MODE/HOLD button again to exit the
HOLD mode and return to normal operation.
3. If more than 25 readings are stored, previously
stored readings (starting with number 1) will be
overwritten.
Recalling Stored Readings
1. Press the CAL/RECALL button and then press the MODE/HOLD
button. A location number (1 through 25) will briefly appear and then
the value stored in that location will appear. The displayed units will
flash, indicating that the storage recall mode is active.
2. The last stored reading will be displayed first. Pressing and releasing
the MODE/HOLD button will scroll through the stored readings one at
a time. The location number is displayed first, followed by the reading
stored in that location.
3. To exit the storage mode, press the CAL/RECALL button and the
meter will return to normal operation, after displaying “End”.
Clear Stored Memory
With the unit on, press and hold ON/OFF for 4 seconds. “CLr” will be
briefly displayed when the memory is cleared.

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Changing Temperature Units
To change the displayed temperature units (oC or oF):
1. With the unit OFF, press and hold down the CAL/RECALL button.
2. With the CAL/RECALL button depressed momentarily press the
ON/OFF button. When “SELF CAL” appears in the display release the
CAL/RECALL button. The unit will power on with temperature
displayed in the new units.
Data Hold Mode
Press the MODE/HOLD button to hold (freeze) a reading in the display.
The meter will enter the HOLD mode and the “HOLD” indicator will
appear.
Note: This also stores the reading.
Press the MODE/HOLD button again to return to normal operation.
Auto Power OFF
The auto power off feature automatically shuts the meter off 10 minutes
after the most recent button press.
Auto Power OFF Disable
To disable the Auto Power Off feature:
1. Turn the unit on.
2. Press CAL/RECALL once (Quickly)
3. Immediately and simultaneously press the MODE/HOLD and ON/OFF
buttons for approximately 2 seconds, until “oFF” is briefly displayed
To disengage this feature, turn the unit off with the ON/OFF button. The
next time the unit is powered up, Auto Power OFF mode will be engaged
again.

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Low Battery Indication
When the batteries become weak the “ ” icon will appear in the
display. Refer to the Maintenance section for battery replacement
information.
Measurement and Display Considerations
If the unit appears to be locked (display frozen). It is possible that the
Data Hold mode has been inadvertently accessed by pressing the
MODE/HOLD button. (“HOLD” will be displayed in the bottom left of the
LCD.) Simply press the MODE/HOLD button again or turn the meter off
and then on.
For maximum accuracy, allow sufficient time for the temperature of the
probe to reach the temperature of the sample before calibrating. This will
be indicated by a stable temperature reading on the display.
Reset Calibration Data
Follow this procedure to clear all calibration data from the meter.
Resetting the calibration data may be necessary when new calibration
solutions are used or accuracy of measurements is in question.
1. Turn off the meter.
2. Press and Hold the Cal/Recall and Mode/Hold buttons.
3. Momentarily press the On/Off button, as soon as the display comes
on, release all 3 buttons.
4. The display will show “dFLt rSt” (default reset) and all of the
calibration data will be erased. If “dFLt rSt” does not appear, retry the
procedure.
5. Proceed to the calibration routine for Conductivity.
Calibration - Conductivity
Meter accuracy verification should be performed on a periodic basis.
Once per month is the recommended cycle for normal use. If calibration
is required, a conductivity standardizing solution must be obtained. The
meter can be calibrated in any or all of the three ranges. Standardizing
solutions of 84µS/cm, 1413µS/cm or 12.88mS/cm (12,880µS/cm) are
used for the automatic calibration recognition procedure. No other
calibration values are permitted.

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Calibration is always done in conductivity mode. Since salinity and TDS
values are calculated from conductivity values, this procedure also
calibrates the salinity and TDS ranges.
Fill a sample cup with the standardizing solution.
1. Turn the meter ON and insert the electrode into the solution. Tap or
move the electrode in the sample to dislodge any air bubbles.
2. Press and hold the CAL/RECALL button (approximately 2
seconds) until “CAL” appears in the lower (temp) display. The main
display will start flashing.
3. The meter will automatically recognize and calibrate to the
standardizing solution. The display will briefly indicate “SA”, End
and then return to the measurement mode after a calibration.
4. Note: The “SA” will not appear if the calibration fails.
5. The “range calibrated” symbol will appear in the display for each
range that is calibrated during that power on cycle.
Low range, 84µS/cm
Medium range, 1413µS/cm
High range, 12.88mS/cm (12,880µS/cm)
Note: Each time the calibration mode is entered all calibration symbols on
the display are cleared, but only the calibration data for the currently
calibrated range is replaced. The other two ranges keep the existing
calibration data, just the symbols are removed. Calibration of all three
ranges must be performed during one power on period for all three range
calibration symbols to appear.
See Reset Calibration Data to clear all calibration data from the meter.
Note: The meter allows for a 1, 2 or 3 point calibration. If calibration is
done for more than one point the lowest value standard should be done
first to obtain the best accuracy.
Considerations and Techniques
Do not touch the inner surfaces of the conductivity electrodes. Touching
the surface of the platinized electodes may damage and reduce the life
of the probe.
Store the electrode dry, in the storage cap.