Hach Chlorine Sensor, Руководство пользователя

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9. If Chemical was selected:
a. Turn off the process flow and put water with no chlorine through
the flow cell. Make sure the temperature of the water with no
chlorine is as close as possible to the process sample flow
temperature.
b. Push ENTER .
The measured value is shown.
c. Wait for the value to stabilize and push ENTER
4
to set the zero-
point chemically.
10. 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.
Do sensor maintenance (refer to Maintenance on page 16) and
then repeat the calibration.
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 the calibration options
on page 15.
13. On the New Sensor screen, select whether the sensor is new:
Option Description
YES The sensor was not calibrated previously with this instrument. The
days of operation and previous calibration curves for the sensor are
reset.
NO The sensor was calibrated previously with this instrument.
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.
2-point calibration procedure
1. Push the MENU key and select Sensor Setup, Calibrate, Chlorine.
2. Select 2 Point Sample.
3. If the passcode is enabled in the security menu for the controller,
enter the passcode.
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.
5. Select the type of calibration:
Option Description
ELECTRICAL The offset produced by the gateway is removed to set the
zero-point (no sample used). Then a process sample is
measured to set the second point from which the slope is
calculated.
CHEMICAL Water with no chlorine is measured to set the zero-point.
Then a process sample is measured to set the second point
from which the slope is calculated.
6. If Electrical was selected:
a. Wait for the value to stabilize and push ENTER
5
to set the zero-
point electrically.
b. Push ENTER to continue the calibration.
The measured value of the process concentration is shown.
c. Wait for the value to stabilize and push ENTER
5
to enter a
process flow measurement.
5
If the option for Auto Stab (auto stabilization) is set to Yes in the Calibration Options menu, the screen will advance to the next step automatically.
Refer to
Change the calibration options on page 15.
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