Chemitec 4204 - 7.2.5 Table [1.5]; 7.2.5.1 Set up for the “Bazin” type overflow

4204
FLOW METER
TECHNICAL MANUAL P/N XXX-0000 Rev. 5 Ver. 3.4
31
• Stram. V (A triangular V "Thompson" spout)
• Other (a freely programmable exponent)
The last type (Other) refers to a non standard exponential device and therefore the exponent may be
freely programmed by the user.
7.2.4.1.4 Exponent
It defines the exponent used for calculations, related to the PMD selected. This field can only be
modified if PMD = OTHER has been selected: for standard PMD's it is set automatically and in
display only (this indicates the exponent value defined by the PMD itself).
7.2.4.2 Flow Param [1.42]
It allows for setting of the field of measurement of the flow.
Move to “FLOW” [1.4] and select “PARAMETERS”[1.42].
The following fields are available:
“Q MAX”
“CUT OFF”
They can be selected according to the contents of paragraph 7.1 i).
7.2.4.2.1 Q Max
In this field “Q MAX” the maximum value of the instant flow corresponding to the maximum
recess should be inserted (see paragraph 7.2.3.2.2. max h_) .
The maximum value that can be set is 9999 mc/h; if it is set as a unit of measurement “l/s”, the
maximum value will be 2777 l/s).
7.2.4.2.2 Cut off
The “CUT OFF” field specified the threshold (0-99% of instant flow) below which the volume
should not be counted.
7.2.5 TABLE [1.5]
Press ENTER to access to the “Points” menu.
If “Points”=0 the empirical function is not used (and the flow is calculated using the analytical
function); in this case in 1.32 LEVEL PARAM the “h.MAX” (maximum height) field is shown
and in 1.42 FLOW PARAM the “q.MAX” (flow value at h_max that defines the FS) field is
shown.
If “Points”=N (N between 1 and 130) the empirical function is used; in this case in 1.32 LEVEL
PARAM the “h.exp” field is shown and in 1.42 FLOW PARAM the “q.exp” field is shown;
the h_exp/q_exp parameters define the analytic part of the flow calculation (from h=0 to h=h_exp);
if h has a value between h_exp and h(N) the flow will be calculated with a linear interpolation of the
defined points. In this case the FS of the flow is defined by q(N) (the last point of the table).
If, for example, <Points>=3the first 3 points of the table can be edited (using the UP/DOWN keys):
h(1) is the height of the 1-st point
q(1) is the flow of the 1-st point
At h(3) (the very last point of this example) the h_max value is shown and at q(3) the q_max value
is shown: these are useful to remember that if the table is on, the FS are defined from the last point
of the table itself: