Construction - ABB MAG-X 3000 Series Instruction Manual

INSTRUCTION MANUAL 10DX3111A&G Sizes 14 - 24 Inches
Factors such as liquid viscosity and density require no compensation and have no effect on the
measurement accuracy of the Magnetic Flowmeter. Metering limitations are confined to a minimum
threshold of electrical conductivity inherent to the liquid being metered. The degree of liquid conduc-
tivity has no effect upon metering accuracy as long as it is greater than this minimum level. Liquid
temperature is limited only to the extent that it may affect liquid conductivity and, like liquid pressure,
to the extent that it can not exceed the meter material specification limits.
The associated electronics package is called the Signal Converter and is remotely mounted. Models
50XM1000 and M2 microprocessor-based Signal Converters are available for use with models
10DX3111A and 10DX3111G Magnetic Flowmeters respectively. The Signal Converter contains a
magnet driver unit that is used to power the meter's magnet coils. The steady bipolar state magnetic
®
field principle, referred to as the MAG-X design concept, provides optimum zero point stability at an
optimized drive frequency.
For information concerning the Signal Converter, refer to the Signal Converter Instruction Bulletin.

1.1.2 Construction

The ABB Automation Series 3000 Magnetic Flowmeter consists of a flanged, carbon steel pipe spool
which serves as a meter body. A pair of arched, oval shaped magnet coils fit on opposite sides of the
meter body inner surface as shown in Figure 1-1. The meter body provides a flow return path for the
magnetic field generated by the coils. These latter components are potted inside the pipe spool to
form an encapsulated assembly. Unless otherwise specified, the meter flanges are carbon steel and
mate with ANSI Class 150 pipe flanges.
®
An insulating interior liner of either TEFLON (PTFE), neoprene or polyurethane is inserted into the
spool 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 insulated 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 liquid 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.
Electrode and magnet coil wiring is brought out through two access holes in the top of the meter
body. Typically, electrical interconnections enter the electronic housing through a watertight cable
seal fitting (see Figure 1-1). The use of metal electrical conduit is recommended for both physical
protection of signal wiring and for reduction of spurious electrical signals and interference.
The primary housing sealed with a round screw-on access cover. The interior of this housing is filled
with a gelatin-like silicone rubber compound which helps give the meter its waterproof rating. The
internal construction of this meter is shown in Figure 3-2.
1-2