Liquid Controls IT200N - Manual (Page 9)

Sponsler, Inc. IT200N Remote Rate Indicator pg. 9 DOC#: MN-200N-D.DOC
New C.F. = 50/52 x 250 = .96 x 250 = 240
On the Factoring P.C.B.:
Set S1@0, S2@4, S3@2, S4@0, S5@0
In the above example, .96 denotes that the meter is operating 4% slow. Multiplying by the present C.F.
(.250) by the Displayed : Actual Ratio (.96) effectively reduces the error by decreasing the C.F. by 4%.
Rate Display Considerations
The displayed rate is limited to a maximum of 30,000. This limitation must be considered when
determining the displayed engineering unit. Note that if the rate displayed is other than ‘Per Minute’, the
calibration factor is only correct for the rate function. The factored output pulse is correct with rate per
minute only.
Example #9: A 1” turbine meter has a maximum flow rate of 60 GPM and a K-Factor of 970 pulses per
gallon in Liquid Oxygen. The desired engineering unit is SCFH.
Given: 1 gallon O
2
= 115 SCF
1) Determine maximum flow rate; does it exceed 30,000?
60 GPM x 115 SCF = 6900 SCFM
6900 SCFM x 60 = 414,000 SCFH
414,000 exceeds 30,000; therefore, direct SCFH units are not permissible and some
factor of SCFH must be determined.
2) Determine what factor of SCFH is permissible –
4140 is the largest SCFH factor under 30,000; 1/100 of the actual SCFH flow rate
3) Determine the calibration factor for SCFH x 100-
K-Factor = 970 Pulses per gallon
SCF O
2
= 115 per gallon
A) In order to establish x 100 decrease SCF/Gal by a factor of 100 (115 / 100 = 1.15)
B) In order to establish per hour increase SCF/Gal by a factor of 60 (1.15 x 60 = 69)
C.F. = 970/69 = 14
On the Factoring P.C.B.:
Set S1@4, S2@1, S3@0, S4@0, S5@0
Example #10: Using the specifics of example #9 establish SCFM as an engineering unit.
C.F. = 970/115 = 8
On the Factoring P.C.B.:
Set S1@8, S2@0, S3@0, S4@0, S5@0
To check the C.F. calculations, formula #2 or #3 should be incorporated. Frequently, only the K-Factor
is known, so it is necessary to determine the frequency for a given flow rate; to do so use this formula:
Frequency = K-Factor x Flowrate
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