Hach 3700 Series Basic User Manual page 23

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. With the sensor in the process sample, push ENTER.
The measured value is shown.
7. Wait for the value to stabilize and push ENTER.
8. Measure the conductivity (or other parameter) value with a secondary verification instrument. Use
the arrow keys to enter the measured value and push ENTER.
9. Review the calibration result:
• Passed—the sensor is calibrated and ready to measure samples. The slope and/or offset
values are shown.
• Failed—the calibration slope or offset is outside of accepted limits. Repeat the calibration with
fresh reference solutions. Refer to
on page 25 for more information.
10. For the sc100 controller, go to step 14.
11. If the calibration passed, push ENTER to continue.
12. If the option for operator ID is set to Yes in the Calibration Options menu, enter an operator ID.
Refer to Change calibration options
13. 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.
14. 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.
Temperature calibration
The instrument is calibrated at the factory for accurate temperature measurement. The temperature
can be calibrated to increase accuracy.
1. Put the sensor in a container of water.
2. Measure the temperature of the water with an accurate thermometer or independent instrument.
3. Push the MENU key and select Sensor Setup, [Select Sensor], Calibrate.
4. Select 1 PT Temp Cal (or Temp Adjust) and push ENTER.
5. For the sc100 controller, select Measured Temp and push ENTER. The measured temperature
show.
6. For the sc100 controller, if the measured value shown is not the same as the value shown on the
thermometer, adjust the temperature value shown. Select Edit Temp and push ENTER.
7. For the sc100 controller, go to step 10.
8. Wait for the value to stabilize and push ENTER.
9. Enter the exact value and push ENTER.
10. Return the sensor to the process and push ENTER.
Maintenance on page 25 and
on page 24.
Troubleshooting
English 23