Data Logging; Calibrate The Sensor - Hach NX7500 Manual Del Usuario

Option
STORING
4
LOG PROTOCOL
4. On the lower menu bar 4 options show
Option Description
SAMPLE Manually starts a measurement.
RESET Sets the probe settings back to the factory default settings.
MARK Records the next measured value in the data log.

Data Logging

The probe has one data log that keeps approximately 42,000 measurements. The factory-set
measurement interval is 2 minutes. When the data log is full, new data replaces the oldest data.
Refer to the controller documentation for instructions on how to access and export the data log.

Calibrate the sensor

Probes are factory calibrated. The probe cannot be calibrated by the user. Contact the manufacturer
for instrument calibration.
If necessary, the user can set a factor (or offset) to adjust the measurements to reference values.
Use the offset to adjust the values of the probe compared to laboratory values when constant
deviations of the measurement are seen. The adjustment of the offset lowers or increases the
calibration curve of the probe. Refer to the instructions for the 0.3 mm optical path length sensors
that follow.
Calibrate instruments with an 0.3 mm optical path length to adjust the NO
grab samples with known values or standard solutions to determine the calibration factor. Enter the
parameter factors and offsets.
If necessary, enter the upper and lower limit values for the warning thresholds. The warning
thresholds are the color limits used to program concentrations at which the controller shows a red or
yellow warning for the probe. For example, the Nitrate value is important for the user and should not
go above 10 mg/L. Then the user sets the upper limit 1 (yellow) at 8 mg/L and the upper limit 2 (red)
at 10 mg/L. If the measurement value is higher than the limit the controller changes the color to
yellow or red on the home screen of the sensor.
1. From the Main menu, select Sensor.
The connected probes show on the COM port windows.
2. Select the parameter.
3. Select an option.
Option
Alternative name for display
Use user
Offset
4
The name of the log protocol shows on the screen.
14 English
Description
Sets the settings for data storage:
• Enabled: Select to enable data storage for the individual probe.
• Comment: Adds a comment in the stored measurement values.
• Interval: Sets the storage interval in the data log. Set 0 seconds to disable.
Sets the settings for the probe login protocol (default: Modbus).
Note: The log protocol is the type of data used to save the data on the controller.
The log protocol is set at the COM port window. Refer to the controller
documentation for additional information.
Description
Sets an alternative name for the measured paramenter.
Select to enable a scaling factor to apply on the measurements.
Sets the reading offset value for the parameter.
and NO readings. Use
3 2