The M111 Spiraflo
transducer is a pipeline unit for use on dry saturated and
superheated steam only, as part of a steam flowmetering
system.
The Spiraflo
steam meter operates on the well-established spring loaded
variable area principle. A circular plate positioned in the
flow is free to move against the action of a heavy duty
precision made torsion spring. To determine the plate angle,
a rotary transformer of special design is incorporated into
the unit. This converts the plate angle into an electrical
output which is
proportional to the flow. The device operates within the
pressurized body of the transducer, thus eliminating the
need for any rotary seals. The result is a robust design,
well suited to the rigors of steam service. It offers good
turndown, high accuracy and repeatability.
An in-built
temperature probe provides information which enables the
flow computer to compensate for the pressure variations
which are commonplace in steam systems. This density
compensation is essential in achieving accurate measurement
of steam flow. The addition of a pressure transmitter
enables the Spiraflo to be used for superheated steam as
well as saturated steam systems. |
