Proline Promass Q 300
48
Hauser
The minimum distance a between the transmitter and the insulation is 10 mm (0.39 in). This is to
ensure that the transmitter remains completely exposed.
0
20
60
40
80
[ ]
in
1
2
3
0
t
100
4
[
]
mm
t
40(104)
t
60(140)
80
100
120
140
200
300
400
160
180
200
[°F]
T
m
[°C]
A0029921
t
Insulation thickness
T
m
Medium temperature
t40
(104)
Maximum recommended insulation thickness at an ambient temperature of T
a
= 40 °C (104 °F)
t60
(140)
Maximum recommended insulation thickness at an ambient temperature of T
a
= 60 °C (140 °F)
Heating
Some fluids require suitable measures to avoid loss of heat at the sensor.
Heating options
• Electrical heating, e.g. with electric band heaters
• Via pipes carrying hot water or steam
• Via heating jackets
NOTICE
Danger of overheating when heating
‣
Ensure that the temperature at the lower end of the transmitter housing does not exceed
80 °C (176 °F).
‣
Ensure that convection takes place on a sufficiently large scale at the transmitter neck.
‣
Ensure that a sufficiently large area of the housing support remains exposed. The uncovered part
serves as a radiator and protects the electronics from overheating and excessive cooling.
Vibrations
The operational reliability of the measuring system is not affected by plant vibrations.
Custody transfer measurement
The measuring device is optionally tested in accordance with OIML R81/R117 and has an EC
evaluation certificate according to Measuring Instruments Directive 2014/32/EU (MID) for service
subject to legal metrological control ("custody transfer") for liquids other than water and cryogenic
liquids (Annex MI-005).
The permitted fluid temperature in these applications is –196 to +80 °C (–321 to +176 °F).
The device is used with a legally controlled totalizer on the local display and optionally with legally
controlled outputs.
Measuring devices subject to legal metrological control totalize in both directions, i.e. all the outputs
consider flow components in the positive (forward) and negative (reverse) flow direction.
Generally a measuring device subject to legal metrological control is secured against tampering by
seals on the transmitter or sensor. These seals may normally only be opened by a representative of
the competent authority for legal metrology controls.
• After putting the device into circulation or after sealing the device, operation is only possible
to a limited extent.
• Detailed ordering information is available from your local Hauser sales center for
national approvals, which are based on the OIML certificates, for applications with liquids
other than water or cryogenic liquids .
