Platinum-Cell Conductivity Probe (CONPT-BTA)
Specifications and User Guide
TROUBLESHOOTING
-Primary Test: Plug the sensor into a Vernier interface, run the data-collection program, and take a reading in a solution of known Total Dissolved Solid (TDS).
For best results, condition the electrode in a standard solution for three to five minutes prior to use.
-Minimum software version: Logger Pro 3.10.1, LabQuest App 2.6
SPECIFICATIONS
Range: 0-2000 uS/cm (0-1000 mg/L TDS)
Body description: epoxy body, 2-cell platinum element
Accuracy using factory calibration: +/- 40 uS/cm
Accuracy using custom calibration: +/- 10 uS/cm
Response time: 95% of full-scale in 5 seconds
Temperature compensation: two settings – none or 2% for 5 to 35 degC
Temperature range: 0 to 80 degC
Cell constant: 1.0 cm-1
Shaft dimensions: 12 mm OD x 120 mm length
Minimum submission depth: 3 cm
CALIBRATION
You do not have to perform a new calibration when using the Platinum-Cell Conductivity Probe for most experiments. Each probe is programmed with a custom calibration prior to shipping. The factory calibration is set while the probe is at room temperature with the temperature compensation at 2%.
However, if your experimental application requires more accurate readings or if you are testing without temperature compensation, you should calibrate your sensor.
To calibrate
1. Make sure the temperature compensation switch is set to the desired position.
2. Initiate the calibration procedure in the software.
3. First calibration point: Place the Platinum-Cell Conductivity Probe into a known standard solution. Be sure the entire elongated hole with the electrode surfaces is submerged in the solution and that there are no bubbles along the electrode surface. Wait for the displayed voltage to stabilize. Enter the value of the standard solution in the appropriately chosen units for Reading 1. Click Keep. Note: Performing a zero-point calibration is not recommended with conductivity sensors. It is preferred that you use a low standard calibration standard instead of a zero point. This is particularly important if you plan to take measurements below 200 uS/cm where the low calibration point is most critical.
4. Second calibration point: Place the Platinum-Cell Conductivity Probe into a different standard solution. Be sure the entire elongated hole with the electrode surfaces is submerged in the solution and that there are no bubbles along the electrode surface. Wait for the displayed voltage to stabilize. Enter the value of the standard solution for Reading 2. Click Keep.
5. If you want to use the calibration for the current session only, click Done to complete the calibration process. To save the calibration onto the sensor, click the storage tab and save to sensor.
6. Click Done or tap OK to complete the calibration process.
STORAGE AND MAINTANENCE
*When you have finished using the Platinum-Cell Conductivity Probe, simply rinse it off with distilled water and blot it dry using a paper towel or lab wipe. The probe can then be stored dry.
*If the probe cell surface is contaminated, soak it in water with a mild detergent for 15 minutes. Then soak it in a dilute acid solution (0.1 M hydrochloric acid or 0.5 M acetic acid works well) for another 15 minutes. Then rinse it well with distilled water and blot dry. Important: Avoid scratching the inside electrode surfaces of the elongated cell.
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