Instruction manual
OCM Pro CF
®
OCM Pro CF - Rev. 09 as of 07.06.2016
page 147
Fig. 9-152 Flow velocity measurement range
Velocity h_crit
This table either indicates the latest associated values which have been
determined during normal operation in automatic mode (measured level and
associated velocity) or according values will be set here.
Depending on the setting chosen in the following menu, the values set are either
going to be verified or corrected (automatic YES and/or modification of Strickler
coefficients) or otherwise these values are going to be used permanently
(automatic NO) at the subsequent measuring event.
Fig. 9-153 Table of values for automatic Q/h relation
h_crit
It is no longer possible to measure the flow velocity as soon as a certain filling
level has been undershot. This level is named h_crit.
The level h_crit is defined by the sensor construction, the sensor type and the
measurement method. After initial start-up h_crit is set to 0.000 m. This allows
to automatically accept the values saved in the sensor:
POA-Sensor: 0.065 m / CS2-Sensor: 0.10 m / CSM-Sensor: 0.030 m.
These values will be adjusted automatically in the background as soon as
PAR/Flow velocity/Mounting height is modified. If after the initial start-up with
the automatic mode activated no flow velocity is indicated, a level of 0.065 m
(POA), 0.10 m (CS2) or 0.030 m (CSM) has not been overshot yet. In this case
a flow velocity value prevailing at h_crit may be entered manually. If this value
should be unknown it may possibly be assessed or calculated hydraulically. The
automatic mode is not required as long as it is not necessary to indicate and to
output flow rates lower than h_crit. In this case leave the entry >0< under v_crit
unmodified.
