Hach 3700 Series Basic User Manual page 22

8. 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.
9. With the sensor in the reference solution, push ENTER.
10. For the sc100 controller, go to step 13.
11. Enter the reference temperature of the reference solution and push ENTER.
12. Enter the slope of the reference solution and push ENTER.
13. Wait for the value to stabilize and push ENTER.
Note: The screen may advance to the next step automatically.
14. Enter the value of the reference solution and push ENTER.
15. 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.
16. For the sc100 controller, go to step 20.
17. If the calibration passed, push ENTER to continue.
18. If the option for operator ID is set to Yes in the Calibration Options menu, enter an operator ID.
Refer to Change calibration options
19. 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.
20. 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.
Calibration with the process sample
The sensor can remain in the process sample, or a portion of the process sample can be removed
for calibration. The reference value must be determined with a secondary verification instrument.
Note: If the sensor is calibrated for the first time, be sure to complete the zero calibration first.
1. Push the MENU key and select Sensor Setup, [Select Sensor], Calibrate.
2. Select Sample Cal and push ENTER.
3. For the sc200 and sc1000 controller, select the type of calibration and push ENTER:
• Conductivity—Sample Cal
• TDS—TDS Cal
• Salinity—Sample Cal
• Concentration—Conc Cal
4. If the passcode is enabled in the security menu for the controller, enter the passcode.
22 English
Maintenance on page 25 and
on page 24.
Troubleshooting