ARI Armaturen ARImetec-S EN - Manual (Page 29)

Rev. 0040807015 1014 Page 2-29
Operating Instructions
ARImetec
®
-S
are lower than at one or more pipelines, an external sound source is influencing the
ultrasonic measurement.
In both instances a temperature measurement must be carried out to facilitate a reliable
and unequivocal evaluation, as it is necessary to determine whether the flow is of steam
or condensate and whether the steam trap is working correctly.
a) Thermostatic steam traps (CONA
®
B / M / TD):
A thermostatic steam trap is evaluated further by measuring the surface temperature, as
shown in the graph below, and comparing it with the boiling temperature:
i. If T(internal) is more than 5… 10 K below the boiling temperature, this indicates a
condensate flow. The steam trap is functioning correctly.
ii. If T(internal) is approximately equal to the boiling temperature, this indicates a
steam flow. The steam trap is defective.
iii. If the reading is higher than the boiling temperature (superheated steam), the
steam trap is also defective.
b) Float-type steam traps (CONA
®
S / SC):
A float-type steam trap is evaluated by measuring the temperature difference between
the inlet and outlet.
i. If the steam trap is working correctly, a significant temperature drop must be
measured from the inlet to the outlet.
ii. If the temperature measured at the outlet is just as high as the temperature at the
inlet, there is a steam flow. The float-type steam trap is defective.