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22
SECTION 4 CALIBRATION OF ANALOG OUTPUT
4.1 INTRODUCTION
In general, all flow measurement systems supplied by OMEGA
Engineering have been factory calibrated as specified by the
user, at the time of purchase.
All systems which underwent such a factory calibration have a
calibration card attached prior to shipment. This card contains
the details of analog outputs as well as other useful calibration
data.
Field calibration is only required when a change has occurred or
is sought to the measuring system. Such a change may be due to
repair, replacement or recalibration of the flowmeter, or perhaps
a change in the analog output span.
4.2 CALIBRATION PROCEDURE
Begin by determining the equivalent maximum volumetric flow
rate in GPM, expected by the application, term this GPM
(MAX). GPM (MAX) may be calculated based on the analog
output scale requirements or may be the maximum flow rate
listed on the flowmeter’s calibration sheet (supplied with
flowmeter
From the calibration constant (or K Factor) listed on the data
sheet for the flowmeter, obtain the frequency corresponding to
GPM (MAX) using Equation #1 and designate this frequency F
(MAX).
Equation #1 FMAX = KAVE X GPMMAX
60
The analog output of the FLSC-28 may be calibrated with the aid
of an external oscillator used in conjunction with a frequency
counter.
TABLE 3-1
RANGE SELECT
Range Select For F Max.
Switch Position
1 75 to 150
2 150 to 300
3 300 to 600
4 600 to 1200
5 1200 to 2400
6 2400 to 4800
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