Instructions for Use
– SCHMIDT
®
Flow Sensor SS 20.700
Page 8
General installation conditions
The sensor head of the
SS 20.700
consists of two basic elements:
Heater
The longer of the two sensor tubes at the tip of the sensor head is the
so-called heater. It consists of a heated, temperature-dependent resis-
tor that is used to measure flow velocity.
The end of the heater element, to which the length specification (L) of
the sensor also refers, represents the actual measuring point of the
flow measurement and should be placed as favourably as possible in
the flow, e.g. in the middle of the pipe.
Temperature sensing element
The shorter of the two sensor tubes at the tip of the sensor head is the
temperature sensor. It consists of an unheated, temperature-depend-
ent resistor, which measures the temperature of the medium.
The aerodynamically
optimized design allows tilting around the longitudi-
nal axis of the sensor up to ±3° relative to the ideal measuring direction
(see Figure 3-2) without significant impact on the measurement result
5
.
The axial tilting of the sensor head relative to the flow direction
should not exceed ±3°.
Position the sensor head always at the most advantageous posi-
tion for flow measurement.
The sensor measures unidirectional
(see “flow arrow” in Figure
3-2) and must be adjusted correctly relative to the flow direction.
View on probe head
View on enclosure cover
Figure 3-2 Alignment of sensor to flow direction
5
Deviation < 1 % of the measured value
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