Dwyer TDS2-10 - Manual (Page 3)

P1.0 Temperature Parameter Setting (t)
1. When the meter is in measurement mode, press f for more than 2 seconds to
enter setup mode.
2. Press , , or to select P1.0.
3. Press momentarily again to enter unit setting.
4. Press or to select C or F.
5. Press momentarily to confirm the unit, or press it for more than 2 seconds to
return to P1.0 without saving.
6. While in P1.0, press for more than 2 seconds to return to measurement mode.
P3.0 Reset Meter (rSt)
When you decide to reset the meter, all parameters will be reset to factory default
values, including the calibration information.
P3.1 Reset
1. In P3.0, press momentarily to enter P3.1.
2. Press or to select Y or N.
3. Press momentarily to confirm the state and return to P3.0, or press it for more
than 2 seconds to return to P3.0 without confirming the P3.1 value.
P4.0 Review Calibration Information (CAL)
In P3.0, press or to select P4.0.
P4.1 Range 1 Calibration Information
In P4.0, press momentarily to enter P4.1 and you will see the last calibration
concentration. If the meter is not yet calibrated, “---”will display on the LCD.
P4.2 Range 2 Calibration Information
In P4.1, press or to enter P4.2 and you will see the last calibration concentration.
If range 2 is not yet calibrated, “---” will display on the LCD.
In P4.1 or P4.2, press momentarily to confirm the state and return to P4.0.
In P1.0, P2.0, P3.0, P4.0, you can press for more than 2 seconds to return to
normal measurement mode.
Select Measure Range (rAn)
Two measurement ranges are available for each parameter. For conductivity, users
can select either 0 to 1999 uS or 0 to 19.99 mS. For TDS, users can select either
0 to 1999 ppm or 0 to 19.99 ppt.
ppt = parts per thousand
To manually select the measurement range:
1. Turn off the meter and stay in normal measurement mode.
2. Press or for more than 2 seconds to select the range.
(Default)
Calibration Mode (CAL)
Preparing for Calibration
Two issues need to be considered and prepared for before operation. First, what
is the right calibration standard? Second, when should you calibrate?
What is the right calibration standard?
For best results, select a conductivity or TDS standard near the sample value that
you are measuring. Alternatively, conductivity or TDS use a calibration solution
value which is approximately 2/3 of the full- scale range you plan to use.
DO NOT reuse the calibration solution. Contaminants in the solution will affect the
calibration and the accuracy. Be sure to use fresh solution each time.
When should you do a calibration?
Calibration is necessary and should be done regularly.
If you are measuring the mid-ranges, calibrate the meter at least once a month.
Soak the probe for 15 minutes before calibration or measurement. This can
saturate the probe surface and minimize drift. If measured at the extreme
temperatures or in a concentration of conductivity 100 mS or TDS 2 mS or <100
ppm or >2 ppm. Calibrate the meter at least once a week to get specified accuracy.
Conductivity and TDS Calibration
Please follow the below steps for the conductivity or TDS meter calibration:
1. Insert the probe into de-mineralized or distilled water for about 30 minutes to
rinse the probe.
2. Select the conductivity or TDS standard which is close to your measurement
range. The factory default setting of the TDS conversion factor is 0.50. If your
solution has a different TDS factor, you can improve the calibration accuracy by
setting the TDS factor before starting the calibration. To convert the TDS factors
to the correct value, please refer to the value provided by standard solution
manufacturer.
3. Pour 3 cm height of the standard into two separate and clean containers.
4. Turn on the meter. Press the mode button to switch between TDS and
conductivity.
5. Rinse the probe in one of the containers. Gently stir the probe. Rinsing could
remove contaminants that affect the calibration and could prevent error.
6. Dip the rinsed probe into the other container. Tap the probe at the bottom of the
container to remove air bubbles. Let the probe stabilize to the solution
temperature.
7. Press for more than 2 seconds to begin the calibration. The conductivity and
TDS value will blink on the LCD.
8. Press the or to adjust the value to match the value to the calibration
standard. You can adjust the conductivity or TDS reading up to ±30% from the
detected value. If the detected value and standard values differ by more than
±30%, it means that the electrode needs to be cleaned. The meter is defaulted
at 25°C.
9. When the “CAL” stops blinking, you can press to confirm the value. The meter
will switch back to conductivity and TDS measurement mode. If “CAL” always
blinks, check the solution and make sure it is stable. Make the input in step 8
equal to the solution value.
10. Repeat steps 1 through 9 for other ranges if needed.
The text P1.1, P1.2, P1.3, P2.1, P3.1 will not display on the
LCD. NOTICE
P4.1 & P4.2 are only for you to “review” the calibration
information, not for calibration. NOTICE