Heinrichs Messtechnik GmbH
Page 14 of 31
Ex-Supplement operating manual
UMC4 with TM/TMU/TME/TMR/TM-SH
4.4.2.1
Conditions for safe operation
When the sensor is mounted externally (remote mount configuration), equipotential bonding between
the sensor and transmitter is to be realized.
If the sensor is used at an ambient temperature of less than -20 °C or greater 60°C, suitable cables,
cable entries and conduit entries are to be used.
The operational wall thickness of the stainless steel flow tube is < 1 mm. The operator is to ensure that this
parameter does not give rise to any risk of fluid or mechanical damage.
4.5
Description of the UMC4 transmitter
When used in conjunction with the sensor, the
UMC4
transmitter measures the mass flow of liquids and gases
in pipelines. The transmitter can be mounted on the sensor or remote. The configuration can be carried out by
using a built-in or standalone control unit. Thereby a high degree of adaptability to user requirements is
ensured. Although the basic device settings, e.g. calibration data are factory-configured, the settings pertaining
to measurement data output and evaluation are user definable.
The UMC4 drives the excitation of the oscillating system in the mass flow sensor and prepares the sensor
signals (position sensor 1 and 2 and the temperature sensor Pt 1000). As a standard, 2 passive analog outputs
4-20 mA and 2 passive binary outputs are available. (1 pulse
or
1 frequency output, 1 status output).Through
current output 1, an additional digital modulated data transmission via HART
®
is possible.
4.5.1
Device identification
The identification of the transmitter UMC4 is subject to the following examples.
Signal outputs intrinsically safe
Signal outputs non intrinsically safe
4.5.2
Ignition category of the transmitter
The transmitter and the terminals are located in an explosion proof housing Ex d. The signal outputs can be
realized eit
her as “Intrinsic safety” type of protection (“i”) or as non
-intrinsically safe signal outputs. The two
types of protection are not to be combined.
The transmitter complies with Category 2 for use in Zone 1, while the sensor circuits comply with
Category
1 “ia.”
