Heinrichs Messtechnik GmbH
OPERATING MANUAL TMU-W / UMC4
Page 19 of 118
Process conditions
Process temperature
− 40 °C to + 100 °C (-40 °F to 212 °F); rating plate specifications apply
Physical state
Liquid product
(maximum density 2 kg/l)
Gaseous product
(minimum density 0.002 kg/l in operating state)
Viscosity
0.3 up to 2,000 mPas (0.3 to 2,000 cP)
Gas content
The use of products containing gases is not permitted for custody transfer operations. In other applications,
the presence of gas will increase false readings. For the readings of products containing gas to be valid,
small gas bubbles must be homogeneously distributed in the fluid.
Large gas bubbles will automatically provoke extremely false readings and will shift the zero point. Thus, the
extent to which readings are false is determined by the process conditions. A rule of thumb in this regard is
as follows: A 1 % gas component will increase false readings by 1 %. The gas component is not to exceed 5 %.
Process pressure range
The applicable pressure range is dependent on the sensor and the selected process connections. It is
essential that the correct process connections for the intended process pressure is selected during the
ordering process.
TMU-W004
up to 1000 bar
TMU-W006
up to 500 bar
TMU-W012
up to 1000 bar
Outlet pressure
Outlet pressure must be greater than the vapour pressure ps of the measured product.
Connection to the transmitter
The sensors of the TMU-W family are only available as remote mount versions.
The connection to the
sensor is achieved via a special ten-cored cable by means of a detachable screw-on connector.
During installation, regulations and applicable legal standards are to be adhered to.
The maximum cable length is 200 m (approx. 650 ft). See Section 5.1.3 on page 36 for information regarding
the connection and cable specifications.
