Introduction; General; Description; Construction - ABB 10DX3111G Instruction Manual

10DX3111G INSTRUCTION MANUAL

1.0 INTRODUCTION

1.1 General

1.1.1 Description

The ABB Instrumentation Model 10DX3111 Magnetic Flowmeter is a volumetric liquid flow rate de-
tector that uses as the process transducing method the characteristic of a conductive fluid to gener-
ate an induced voltage when flowing through a magnetic field. The amplitude of the voltage
produced is directly proportional to the flow rate of the metered fluid.
Being a completely obstructionless metering instrument, the ABB Instrumentation Model 10DX3111
Magnetic Flowmeter can be used to meter liquids without regard to heterogeneous consistency and
is as independent of the tendency to plug or foul as the pipeline in which it is mounted. An inher-
ent advantage of obstructionless construction is that pressure losses are reduced to levels occur-
ring in equivalent lengths of equal diameter pipeline. This reduces or conserves pressure source
requirements in new or existing hydraulic lines as compared to other metering methods. The com-
pact size of the meter results in a light-weight unit which requires no additional support other than
that used normally on pipe runs. Short laying lengths minimize the need for altering existing pipe
runs to accommodate metering. A basic construction of non-corrosive wetted parts and a variety
of meter lining materials permit metering of most corrosive and reactant fluids.
Factors such as fluid viscosity and density require no compensation and have no effect on the
measurement accuracy of the Magnetic Flowmeter. Metering limitations are confined to a mini-
mum threshold of electrical conductivity inherent to the fluid being metered. The degree of fluid
conductivity has no effect upon metering accuracy as long as it is greater than this minimum level.
Fluid temperature is limited only to the extent that it may affect fluid conductivity and, like fluid pres-
sure, to the extent that it can not exceed the meter material specification limits.

1.1.2 Construction

The ABB Instrumentation Model 10DX3111 Magnetic Flowmeter, as shown in Figure 1-1, Cut-Away
View, consists of a flanged, carbon steel pipe spool which serves as a meter body. A pair of
arched, oval magnet coils fit on opposite sides of the meter body inner surface. This permeable
metal pipe spool acts as a core or return path for the magnetic field generated by the coils.
The coils are potted within an epoxy-base compound. An insulating interior liner of NEOPRENE or
polyurethane is inserted and turned-out against the flange faces. Two cylindrical electrodes are
mounted diametrically opposed within the central portion of the meter body and are completely in-
sulated from the metal pipe. The end surfaces of the standard electrodes are virtually flush with
the inner surface of the insulating liner and come into contact with the fluid to be metered. Bullet
nosed electrodes are mounted in a similar way; however, these electrodes protrude slightly beyond
the inner surface of the liner. Standard or bullet nosed electrodes are available. The electrodes
are replaceable without removing the meter from the pipeline.
The meter is available in three versions: splashproof, accidental submergence and continuous sub-
mergence.
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