Filter
Top Products
Photometric Analyzer Operation /Control Unit 3
Part I 3-29
Teledyne Analytical Instruments
AUTOCAL FILSOLL HOLD
CAL-HOLD-TIMER MORE
Select MORE and press ENTER one more time
ALGORITHM APPLICATION
MORE OUTPUT: 4MA
Now you will be able to select the APPLICATION and ALGO-
RITHM set-up functions.
3.8.1 The Set Range Screen
The Set Range screen allows reprogramming of the three analysis
ranges and the calibration range (background fluid, low end of range, high
end of range, and % or ppm units). Original programming is usually done at
the factory according to the customer’s application. It must be done through
the RS-232 port using a computer running a terminal emulation program.
Note: It is important to distinguish between this System programming
subfunction and the Range button function, which is an operator
control. The Set Range Screen of the System function allows the
user to DEFINE the upper and lower limits of a range AND the
application of the range. The Range button function only allows the
user to select or define the limits, or to select the application, but
not to define the application.
Normally the Model 5000BF is factory set to default to manual range
selection, unless it is ordered as a single-application multiple-range unit (in
which case it defaults to autoranging). In either case, autoranging or manual
range selection can be programmed by the user.
In the autoranging mode, the microprocessor automatically responds to
concentration changes by switching ranges for optimum readout sensitivity.
If the upper limit of the operating range is reached, the instrument automati-
cally shifts to the next higher range. If the concentration falls to below 85%
of full scale of the next lower range, the instrument switches to the lower
range. A corresponding shift in the DC concentration output, and in the
range ID outputs, will be noticed.
The autoranging feature can be overridden so that analog output stays
on a fixed range regardless of the contaminant concentration detected. If the
concentration exceeds the upper limit of the range, the DC output will
saturate at 1 V dc (20 mA at the current output).
However, the digital readout and the RS-232 output of the concentra-
tion are unaffected by the fixed range. They continue to read beyond the full-