5.0 CIRCUIT DESCRIPTION
The 10D1472 Flowmeter contains circuitry in the electronics housing which provides two functions:
•
Establishes primary zero
•
Normalizes the flow signal by generating a voltage proportional to coil current.
The magnetic flux in the metering system is directly proportional to the current through the metering
coils.
Zero adjustment is accomplished by using a potentiometer to null a magnetic flux loop located within
the flowmeter body. The meter calibration factor is established via the reference voltage (terminals 6
and 7). Current flowing through the coils is passed through a current transformer which has a load
impedance network on its output winding. The output signal across this impedance and the parallel
1000 ohm resistive load in the signal converter generate a reference signal which is in phase with the
electrode velocity signal and produces an appropriate meter calibration factor. Using current sensing,
the Converter will make a ratiometric measurement of flow velocity which is unaffected by variations
of line voltage or coil temperature.
All 10DS3111 are powered by a 110/120 VAC 50/60 Hz line source.
Refer to Figure 5-1 for electronic circuitry.
10DS3111A INSTRUCTION MANUAL
5-1
Summary of Contents for 10DS3111
Page 9: ...FIGURE 1 2 ELECTRONIC COMPARTMENT WITH COVERS REMOVED 10DS3111A INSTRUCTION MANUAL 1 3 ...
Page 16: ...FIGURE 2 2 OUTLINE DIMENSIONS 14 THROUGH 24 INCHES 10DS3111A INSTRUCTION MANUAL 2 3 ...
Page 24: ...FIGURE 2 9 10DS3111 INTERCONNECTION WIRING 14 24 in 10DS3111A INSTRUCTION MANUAL 2 11 ...
Page 32: ...FIGURE 5 1 DIAGRAM OF FLOWMETER CIRCUIT 10DS3111A INSTRUCTION MANUAL 5 2 ...