Teledyne 5000B - Near Infrared Photometer - Manual (Page 54)

3 Operation /Control Unit Model 5000B
3-26 Part I
Teledyne Analytical Instruments
The concentration ranges can be redefined using the Range function
Manual screen, and the application fluides can be redefined using the System
function, if they are not already defined as necessary.
CAUTION: Redefining applications or ranges might require relineariza-
tion and/or recalibration.
To setup automatic ranging:
Press Range key to start the Range function.
Select range
mode : AUTO
If above screen displays, use the DÑ arrow keys to Select AUTO, and
press Enter.
Press Escape to return to the previous Analyze Function.
3.6.3 Precautions
The Model 5000BF allows a great deal of flexibility in choosing ranges
for automatic range switching. However, there are some pitfalls that are to be
avoided.
Ranges that work well together are:
• Ranges that have the same lower limits but upper limits that differ
by approximately an order of magnitude
• Ranges whose upper limits coincide with the lower limits of the
next higher range
• Ranges where there is a gap between the upper limit of the range
and the lower limit of the next higher range.
Range schemes that are to be avoided include:
• Ranges that overlap
• Ranges whose limits are entirely within the span of an adjoining
range.
• Ranges where the zero is suppressed, is 1-10, 1-100, etc,
however, 80-100, 90-100 is ok where the zero fluid is actually
100% concentration and the calibration is inverted.