OPERATING MANUAL HPC & UMC4
Page 27 of 105
6. Application domain of the UMC4 transmitter
The microprocessor controlled UMC4 transmitter (hereinafter referred to as UMC4) for use with TM, TME
TMR, TMU and HPC sensors is a programmable transmitter which processes measurement data and
displays and transmits various types of measurement results.
The UMC4 is capable of communication and supports the HART
®
protocol. The device can be custom-
ized using the standard installed control unit BE4. Although basic configuration settings such as transmit-
ter calibration are carried out at the factory, other settings such as those for measurement data pro-
cessing, analysis, display and output are user definable.
User settings are protected by a user definable password. The user password can be changed by the
customer.
Settings that are essential for proper operation of the transmitter in conjunction with the sensor (e.g. cali-
bration and initialization values) are accessible only to service technicians via a password that is not pro-
vided to customers.
Warning
Only sensors and transmitters marked as Ex-proofed on their rating plates may be
used in Ex hazardous areas!
Standard equipment is prohibited for use in Ex hazardous areas.
7. UMC4 transmitter: mode of operation and configuration
7.1
Measuring principle
The Coriolis mass flow meter is based 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. By configur-
ing the sensor in a specific fashion, this force can be used to measure mass flow directly. The UMC4
transmitter evaluates the sensor signal (see Section 4.2.1 Measuring principle on page 14).
7.2
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 analog, passive 4 to 20 mA outputs, an impulse or fre-
quency output and a status output, and is enabled for digital data transfer via the HART® protocol.
Sensor:
The sensors measure mass-flow, density and temperature of fluids or gases. The device can be used to
perform measurements with any liquid or gaseous product providing that the sensor material is suitable
for the product being used.
