Auto Adjust - Hach 8000A Manuel D'utilisation

Option Description
Sensor type Extinction—HRLD
(with common
Dual Mode: MicroCount-05
sensor
Note: The selection of sensor type affects algorithm
examples)
selection.
Algorithm The algorithm is the method used to relate particle size to
sensor voltage. Choose Equation or Interpolation.
The Equation method requires user-entered constants and
variables for the calibration equation. This option is used
with extinction sensors.
The calibration equation used in the Equation mode is V =
s
A x d + N where:
• V = threshold voltage (mV)
• A = intercept (mV)
• d = particle diameter (µM)
• s = slope (Range 1.0 - 3.0)
• N = noise (mV)
The Interpolation method uses four or more calibration
voltage points to calculate the calibration data. This method
is automatically selected in scatter and dual sensor modes.
The interpolation algorithm requires entry of extinction and
scatter points. Enter points in order of increased size.
5. Push EXIT to save the new calibration.
The counter prompts for the storage slot ( 1, 2, 3 or 4) to save the
new data in. The counter recommends new slots first. If all slots are
full, the counter recommends the number of the calibration currently
loaded. If the chosen slot number already has a calibration, the
counter shows a message whether that calibration should be
overwritten. The counter uses a new or modified calibration as the
active calibration until changed.
Enter bin sizes
1. In the Main Functions Menu, push CAL.
The display shows the Calibration functions menu.
2. Push BIN SIZE.
3. Enter the number of channels for the counter.
4. Enter values for the bin thresholds according to particle size—
0.01 to 9999 µm.
The instrument uses sensor calibration data to calculate the
corresponding millivolt settings.
Enter bin sizes as mV
To enter range information with the Bin mV function, it is necessary to
know the sensor type and have access to the sensor calibration curve.
1. In the Calibration function menu, push BIN MV.
The display shows the Bin millivolt settings for the counter. Ranges
are S1 (High Gain) and S2 (Low Gain) for scatter type sensors, and
E1 (High) and E2 (Low) for extinction sensors.
2. View or update the bin threshold millivolt settings. Values must be
between 0.01 and 10000.00.

Auto adjust

The auto adjust function lets bin thresholds be set more accurately. The
instrument display shows "Pass" or "Fail" for each counter.
Do Auto Adjust at least once a day before the counter is used and when
the counter has the correct operating temperature. The counter has the
correct operating temperature approximately 30 minutes after it is turned
on.
The Auto Adjust function takes about 3 minutes to complete. If the
counter operates correctly, the display shows Counter (ID) auto-
adjustment OK.
If a counter fails an auto adjustment, instrument service is necessary.
Quick Adjust
With the Quick Adjust function, the counter makes an estimate for the
settings for the comparator threshold values. These estimates are based
on values from the Auto Adjust function. The Quick Adjust function takes
10 to 15 seconds for each counter.
Do a Quick Adjust after an operator has changed the bin threshold
settings, the calibration curve or analog circuit constants. The Quick
Adjust function does not happen unless an Auto Adjust has been done.
English 17