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61
Total Volume Calculations for Volumetric Flow Controlled Systems
TE-6070V, TE-6070DV, TE-6070V-BL, TE-6070DV-BL
USE OF LOOK-UP-TABLE FOR DETERMINATION OF FLOW RATE
(NOTE: Individual Look Up Tables will vary.)
1. Suppose the ambient conditions are:
Temperature: Ta = 24 oC
Barometric Pressure: Pa = 762 mm Hg (this must be station pressure which is not
corrected to sea level)
2. Assume system is allowed to warm up for stable operation.
3. Measure filter pressure differential, Pf
. This reading is the set-up reading plus pick-up
reading divided by 2 for an average reading. This is taken with a differential
manometer with one side of the manometer connected to the stagnation tap on the filter holder
(or the Bulkhead Fitting) and the other side open to the atmosphere. Filter must be in place
during this measurement.
Assume that:
Set-up Reading: Pf
= 21.75 in H2O
Pick-up Reading: Pf
= 22.5 in H2O
Pf
= (21.75 + 22.5)/2 = 22.125 in H2O.
4. Convert Pf
= to same units as barometric pressure.
Pf
= 22.125 in H2O / 13.61 x 25.4 = 41.29 mm Hg
Pf
= 41.29 mm Hg
5. Calculate pressure ratio.
Po/Pa = 1 - (Pf
/Pa)
NOTE: Pf
and Pa MUST HAVE CONSISTENT UNITS
Po/Pa= 1 - (41.29 / 762)
Po/Pa= .946
6. Look up Flow Rate from table.
Table 1 is set up with temperature in oC and the Flow Rate is read in units of m3/min
(actual, ACMM). In table 2 the temperature is in oF and Flow Rate is read in ft3/min
(actual, ACFM).
a) For the example we will use Table 1.
Locate the temperature and pressure ratio entries nearest the conditions of:
Ta = 24oC
Po/Pa = .946
Example: Look-Up Table for Actual Flow Rate in Units of m3/min
Temperature oC
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