Sensor Calibration - Hach ORBISPHERE 51 Série Manuel D'utilisation Simplifié

Option
Compute offset
Out of range
protection
Measurement
interval
Hold recovery
time
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.
7.4.1 K-M1100 sensor calibration

7.4.1.1 Sensor calibration

The sensor can be calibrated manually on an ad hoc basis. By default, the mode is set to zero
calibration with auto-end.
For higher level concentrations (above 1% oxygen which corresponds to about 400 ppb dissolved
O ) a high level adjustment can be performed using a gas mixture containing more than 1% oxygen,
2
or a known line sample. However, this should not be done without first ensuring the zero point is
accurate. This can be achieved by performing a zero calibration first.
Low range sensors: (K-M1100-L spots)
There are two calibration modes available - zero or high level adjustment. The sensor is factory
calibrated at zero. During use, the zero calibration is the best calibration to guarantee the sensor
specifications. After a spot replacement, a zero calibration is recommended.
High range sensors: (K-M1100-H spots)
There are three calibration modes available - zero, high level adjustment or in 100% humid air. The
sensor is factory calibrated at zero and in 100% humid air. During use, humid air calibration is the
Description
Select this button to recompute the offset value at any time during the
measurement process. The offset value will be computed based on the
current and target measurement values.
Check this box to enable the out of range protection (recommended).
When enabled and the measured value exceeds the instrument
specification, the measurement interval will be increased to 1 minute to
protect the lifetime of the sensor spot. If disabled, the lifetime of the spot
can be negatively impacted if the sensor is exposed to high oxygen
concentrations for long periods of time.
Set the value to between 2 and 60 seconds to define the interval for
refreshing the measurement value on the display.
Note: The minimum value for the measurement cycle interval is 4 seconds for
2 channels and 6 seconds for 3 channels
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.
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