Teledyne 6000A - Photometric analyzer - Manual (Page 48)

3 Operation Model 6000A
3-24 Part I
Teledyne Analytical Instruments
If above screen displays, use the
∆∇ arrow keys to Select AUTO, and
press Enter.
Press Escape to return to the previous Analyze Function.
3.6.3 Precautions
The Model 6000A 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 gas is actually
100% concentration and the calibration is inverted.
Figure 3-2 illustrates these schemes graphically.