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49
4.2 PROCEDURE
Begin by determining the equivalent maximum volumetric low
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.
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-35B maybe calibrated with the
aid of an external oscillator used in conjunction with a
frequency counter.
The external oscillator is used to supply a test frequency. In this
method, the external oscillator is connected to the signal input
terminals as shown in Figure 4-1. The oscillator’s output
frequency is set to equal F (MAX) as indicated on the frequency
counter.
1. The course range adjustment is accomplished by selecting a
switch position on a DIP switch located on the PCA61 printed
circuit card. See Table 3 1 to determine required switch
position and set into switch as shown in Figure 3-3 for
anticipated F MAX.
It is necessary to open the cover of the enclosure by removing two screws
on side of box and lifting cover. Two printed circuit cards are attached. The
“RANGE” Dip Switch may be programmed with a pen. Input power should
be removed during this step.
2. Connect a digital voltmeter or equivalent, across the voltage
output terminals.
3. Adjust ZERO control for desired zero voltage (.000 Vdc)
4. Turn SPAN POT fully CCW until detent is felt or 25 turns.
5. Inject the Test Frequency equal to F MAX while adjusting
SPAN for voltage equal to + 5.000V +1 mV. See test setup
shown in Figure 4-1.)
Repeat steps 3 and 4 until no change is observed.
NOTE
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