Hach 8398 Series User Manual page 15

5. Select the option for the output signal during calibration:
Option Description
ACTIVE The instrument sends the current measured output value during the calibration procedure.
HOLD The sensor output value is held at the current measured value during the calibration procedure.
TRANSFER A preset output value is sent during calibration. Refer to the controller user manual to change
the preset value.
6. Put the sensor in the reference solution. Make sure that the sensing area is fully immersed in the
solution. Stir the sensor to remove bubbles.
7. 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.
8. With the sensor in the reference solution, push enter.
9. Use the arrow keys to enter the reference solution temperature and push enter.
10. Use the arrow keys to enter the reference solution slope and push enter. The measured value is
shown. Wait for the value to stabilize.
11. Use the arrow keys to enter the reference value and push enter.
12. Review the calibration result:
• PASS—the sensor is calibrated and ready to measure samples. The new cell constant K value
is shown.
• FAIL—the calibration slope or offset is outside of accepted limits. Clean the sensor and retry
with a fresh reference solution. Refer to
13. If the calibration passed, push enter to continue.
14. If the option for operator ID is set to YES in the CAL OPTIONS menu, enter an operator ID. Refer
to Change calibration options
15. 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.
16. Return the sensor to the process and push enter. The output signal returns to the active state
and the measured sample value is shown on the measure screen.
Note: If the output mode is set to hold or transfer, select the delay time when the outputs return to the active
state.
Resistor calibration (contacting conductivity sensors)
This type of calibration is sometimes referred to as an electrical calibration and is used to verify the
electrical connection rather than the sensor itself.
1. Push the menu key and select SENSOR SETUP>[Select Sensor]>CALIBRATE.
2. If the pass code is enabled in the security menu for the controller, enter the pass code.
3. Select RESISTOR CAL and push enter.
4. Select the option for the output signal during calibration:
Option Description
ACTIVE The instrument sends the current measured output value during the calibration procedure.
HOLD The sensor output value is held at the current measured value during the calibration procedure.
TRANSFER A preset output value is sent during calibration. Refer to the controller user manual to change
the preset value.
Troubleshooting
on page 17.
on page 18 for more information.
English 15