Hach ORBISPHERE 51 Série Manuel D'utilisation Simplifié page 21

Option
Thermal cutoff:
Purge gas:
7.3.2.4 TC sensor advanced configuration
1. Select the Advanced button on the Measurement configuration screen:
Option
Enable ext. pressure
sensor
Enable negative
concentration
Hold recovery time
Continuous purge
during thermal cut off
Offset and slope
corrections
Liquid to gas factor
7.3.3 Measured data storage
There is one measurement file per channel which contains the data generated by the measurement
cycle.
1. Storage modes:
Option Description
No storage Storage is disabled.
Store once When the volatile memory is full (10,000 positions), the recording of measurement stops.
Rolling buffer When the volatile memory is full, the latest measurement set replaces the oldest one
continuously (first-in, first-out).
7.4 Calibration
Calibrations can only be performed once the instrument has been installed and configured.
Note: The temperature sensor is factory calibrated and can only be changed by a Hach representative.
Description
To protect the sensor, the thermal cutoff function allows for setting a sample high
temperature limit. If exceeded (during a Cleaning In Place cycle for example) the
electrical signal to the sensor is cut off, the measurement session is suspended and the
system displays a HOT alarm message. The system resumes when temperature drops
to 90% of the specified cutoff temperature.
• Thermal cut off options: Disabled / enabled.
• Thermal cut off temperature: To be set according to conditions.
From the drop-down list, select the purge gas being used for the TC sensor.
Description
Check as appropriate.
Check as appropriate.
This parameter defines the interval during which the outputs remain frozen after
the measurement is no longer on HOLD. Set the value to between OFF and
10 minutes, according to the timing of your setup.
If thermal cutoff has been enabled, then check this box to ensure that a
continuous purge of the TC sensor takes place while the measurement session
is suspended due to the thermal cutoff temperature value being exceeded.
Note: To manually set the TC sensor into a continuous purge mode, press the
Continuous Purge button that is available from the Services - Diagnostic -
Channel x - Amplifiers menu.
Enable correction as appropriate. If enabled, the correction values for offset and
slope must be entered. These values cannot be negative.
Enable correction as appropriate. If checked, the percentage correction factor
must be entered. This value cannot be negative.
Note: If you believe you need to enable these corrections, it is advisable to
contact a Hach Service Representative first.
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