IM-P198-05 MI Issue 28
2. Introduction
2.1 RIM20 rotor insertion flowmeters
The Spirax Sarco RIM20 rotor insertion flowmeters provide a reliable solution for process
flow measurement. From a single entry point in the pipeline, RIM20 flowmeters offer precise
measurements of mass or volumetric flowrates.
2.2 Multi-variable mass flowmeters
Mass flowmeters utilize three primary sensing elements: a rotating turbine velocity sensor, an
RTD temperature sensor, and a solid state pressure sensor to measure the mass flowrate of
gases, liquids, and steam. Meters are available as loop powered devices or with up to three
4-20 mA Analogue output signals for monitoring your choice of the six process variables
(energy flow, mass flow, volumetric flow, temperature, pressure and fluid density). The Energy
Monitoring option permits realtime calculation of energy consumption for a facility or process.
2.3 Volumetric flowmeters
The primary sensing element of a volumetric flowmeter is a rotating turbine velocity sensor.
Meters are loop powered. The Analogue 4-20 mA output signal offers your choice of volumetric
or mass flowrate. Mass flowrate is based on a constant value for fluid density stored in the
instrument’s memory.
Both the mass and volumetric flowmeters can be ordered with a local keypad/display which
provides instantaneous flowrate, total, and process parameters in engineering units. A pulse
output signal for remote totalization and MODBUS, BACnet or HART communications are
also available. RIM20 digital electronics allows for easy reconfiguration for most gases,
liquids and steam. The Spirax Sarco RIM20 flowmeters’ simple installation combines with an
easy-to-use interface that provides quick set up, long term reliability and accurate mass flow
measurement over a wide range of flows, pressures and temperatures.
Fig. 1 Rotor Insertion multivariable Mass flowmeters
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