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2.4 Mount with a flow-through chamber
Flow-through chambers are manufactured by Micro Motion, and are available with either
weld-prepared ends or with flange or compression fittings for connection into the process
pipelines. They are available with 1- inch NB, 2-inch NB, or 3-inch NB inlet and outlet pipes.
Important
The length of the inlet and outlet pipes must not be altered, otherwise the temperature response
and stability of the fitting may be adversely affected.
Prerequisites
Installations in flow-through chambers are recommended for processes with the following
conditions:
Flow Constant
• 10–30 l/min for 2-inch Schedule 40
calibration bore section
• 5–300 l/min for 3-inch Schedule 80
calibration bore section
Viscosity 0.5 to 1000 cP
Temperature –50 °C to 200 °C (–58 °F to 392 °F)
–40 °C to 200 °C (–40 °F to 392 °F) in hazardous
areas
Pressure 70 bar @ 204 °C, subject to process connections
Important
• Flow velocity at the pipe wall and fluid viscosity must be within the limits shown to ensure
that the fluid within the pocket is refreshed in a timely manner. This installation will not
respond as rapidly as the free-stream installation to step changes in viscosity.
• The thermal mass of the flanges may affect the response time of the meter to temperature
changes.
Procedure
See Figure 2-4 for an example installation of a meter in a flow-through chamber.
Mounting
Installation Manual 15