Hach Polymetron, User Manual

Page: 12 / 144

11. On the New Sensor screen, select whether the sensor is new:
Option Description
Yes The sensor was not calibrated previously with this controller. The
days of operation and previous calibration curves for the sensor are
reset.
No The sensor was calibrated previously with this controller.
12. Proceed to the calibration with a reference solution or process
sample.
Calibration with a reference solution
Calibration adjusts the sensor reading to match the value of a reference
solution. Use a reference solution that is at the same value or higher
than the expected measurement readings.
Note: If the sensor is being calibrated for the first time, be sure to complete the
zero calibration first.
1. Thoroughly rinse the clean sensor in deionized water.
2. Put the sensor in the reference solution. Support the sensor so that it
does not touch the container. Make sure that the sensing area is fully
immersed in the solution (
Figure 4 ). Stir the sensor to remove
bubbles.
Figure 4 Sensor in reference solution
3. Wait for the sensor and solution temperature to equalize. This can
take 30 minutes or more if the temperature difference between the
process and reference solution is significant.
4. Push the MENU key and select Sensor Setup, [Select Sensor],
Calibrate.
5. Select the calibration for the specified parameter and push ENTER :
• Conductivity—Cond Cal
• TDS—TDS Cal
• Salinity—Cond Cal
• Concentration—Conc Cal or Cond Cal
6. If the passcode is enabled in the security menu for the controller,
enter the passcode.
7. Select the option for the output signal during calibration:
Option Description
Active The instrument sends the current measured output value during
the calibration procedure.
12 English