Interpreting Results; Positive Flow Versus Negative Flow; Flow Range Display - Restek Proflow 6000 Bedienungsanleitung

6.0 Interpreting results

6.1 Positive flow versus negative flow

The unit is capable of measuring both positive and negative (vacuum) flows. The unit automatically
detects the flow direction and assigns a positive (+) or negative (-) flow value depending on the flow
source (Figure 6).
The unit has an operating range of +0.50mL/min. to +500mL/min. and -0.50mL/min. to -500mL/min.
(Figure 7). If the flow is less than 0.50mL/min (positive or negative flow) the display will read "under
range".
If the flow exceeds 500mL/min. (positive or negative flow) the display will read "over range". Excessively
high flow rates may damage this unit. If the flow rate is greater than 600mL/min., the unit will shut off,
requiring the operator to reinitiate the measurement.
NOTE: units of mL/min. are equivalent to ccm.

6.2 Flow range display

The unit automatically adjusts the resolution of the display depend-
ing on the flow range being measured. Table IV shows the resolution
of the flow ranges.
Table IV Display resolution vs. flow range.
F F l l o o w w r r a a n n g g e e ( ( p p o o s s i i t t i i v v e e o o r r v v a a c c u u u u m m ) )
+/- 0.50 – 9.99
+/- 10.0 – 99.9
+/- 100 – 500
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D D i i s s p p l l a a y y r r e e s s o o l l u u t t i i o o n n ( ( m m L L / / m m i i n n . . ) )
0.01
0.1
1
- 6 -
Figure 7 Description of flow ranges.
Figure 6 Example flow
values.
Positive Flow
Negative (vacuum) Flow