Heinrichs Messtechnik GmbH
Page 22 of 118
OPERATING MANUAL TMU-W / UMC4
4.
UMC4 transmitter
4.1
Application domain of the UMC4 transmitter
The UMC4 transmitter (hereinafter referred to as UMC4) for use with TM, TME TMR, TMU, TM-SH and HPC
Coriolis mass-flow sensors, is a programmable transmitter designed to captured and processes
measurement data from its associated sensor for displaying on its built in display or for the transmission of
measurement results via various interfaces.
Via its BE4 control unit, the UMC4 can be customised for use to fit a variety of applications. Although basic
configuration settings such as transmitter calibration are factory performed, other parameters such as
those for measurement data processing, analysis, display and output are user definable.
4.2
Mode of Operation
The Coriolis mass flow meter works on the principle that in a rotating system a force (known as Coriolis
force) is exerted on a mass at a rotation point that is moving towards or away from this point. Utilising a
suitable sensor construction, this force can be exploited for the direct measurement of the mass flow. The
UMC4 transmitter measures and evaluates signals received from sensors positioned on the flow tubes (see
Section 3.2.1, “Measuring principle” on page 12).
4.3
System configuration
Transmitter:
The UMC4 transmitter regulates the excitation of the sensor vibration system and processes the sensor
signals. The standard model is equipped with two analogue, passive 4 to 20 mA outputs, an impulse or
frequency output and a status output, and is enabled for digital data transfer via the HART
®
protocol.
Sensor:
Coriolis sensors measure mass-flow, density and temperature of fluids or gases. They can be used to
perform measurements with any liquid or gaseous product providing that the sensor material is suitable for
the product to be measured.
4.4
UMC4 performance characteristics
Reference conditions
In conformity with IEC 770
Temperature: 20 °C (68 °F), relative humidity: 65 %, air pressure: 101.3 kPa (14.7 psi)
Measured error
For measurement errors and zero point stability refer to the sensor data sheet in section 3.3.2, “TMU-W
flow ranges” on page 13.
Repeatability error
0.05 % of the actual value (Sensor with transmitter).
For more details refer to the sensor data sheet or section 3.3.2, “TMU-W flow ranges” on page 13.
Influence of ambient temperature
Max.
0.05 % per 10 °C
