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▶ 유속계
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Contact
transmission
One signal is generated frim each revolution of the propeller.
The reed-swich for transmission of the propeller revoletions
is composed within a small metal tube to a miniature construction
unit.
The counting frequency for the mechanical counter Z 1
is limited to 10 impulses per second. By application of
the electronical counter Z 4 all flow velocities can be
measured. A complete current meter equipment comprises
6 propellers with 50 mm 
resp. 30 mm
with diverse pitches (see table).
Depending on the requirement, the equipment can also be
delivered with single propellers.
Propellers
(mm) |
pitch
(m)
|
max.
water-
velocity
m/s
|
material
|
|
|
|
80*......
|
......0,30 |
10,0......
|
.....plastic |
|
125*......
|
......0,30 |
10,0......
|
.....plastic |
|
|
|
80.......
|
......0,125 |
5,0......
|
.....metal |
|
80.......
|
......0,25 |
10,0......
|
.....metal |
|
80.......
|
......0,50 |
10,0......
|
.....metal |
|
125.......
|
......0,125 |
5,0......
|
.....metal |
|
125.......
|
......0,25 |
10,0......
|
.....metal |
|
125.......
|
......0,50 |
10,0......
|
.....metal |
|
125.......
|
......1,0 |
10,0......
|
.....metal |
|
|
The standard propeller * consists of plastic (Polyamid
B) and is fibre glass reinforced with a metal winding
inset. They are absolutely of same shape with accurate
pitch and very high stability regarding on temprellers
and deformation. All propellers are interchangeable, no
individual calibration is necessary (individual calibration
only on request).
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