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Siemens QVM62.1 Technical Instructions page 2

Air velocity sensor
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Technical Instructions
Document Number 155-006
October 26, 2006
Operation
(Continued)
Components
Specifications
Power supply
Measuring data
Signal output U1
Line length
Page 2
A scale with 0.20 in (0.5 cm) grating on the immersion stem and the extension pipe
indicates the immersion depth.
The connecting flange is used to attach and seal the immersion stem on the duct wall.
A plastic housing with removable cover accommodates the transducer. It can be
screwed to a flat surface.
The sensor cable is connected: the sensor and the transducer are a unit.
The measuring ranges are selected by inserting or removing a plug-in jumper.
Protection against false wiring is provided related to own voltages. (Measuring output
U1 is short-circuit proof.) The sensor head connections are not protected against 24
Vac operating voltage.
Figure 1. Wiring and Setting Elements.
Operating voltage
Frequency
Power consumption
Output impedance
Measuring ranges, adjustable
Measuring accuracy at 68°F (20°C), 45% rh,
1013 hPa
Permissible air velocity
Direction dependence
Time constant t
at 10 m/s
90
Voltage
Current
Permissible length to controller at:
20 AWG copper cable
18 AWG copper cable
16 AWG copper cable
Line length to the sensor head
QVM62.1 Air Velocity Sensor
1 Terminal block for connection to the
immersion stem.
2 Terminal block for connection to the
controller.
3. Plug-in unit for setting the three velocity
ranges.
No plug-in jumper
= 0 to 16 ft/s
(0 to 5 m/s)
Plug-in on 1 and 2 = 0 to 32 ft/s
(0 to 10 m/s)
(Factory setting)
Plug-in on 2 and 3 = 0 to 49 ft/s
(0 to 15 m/s)
24 Vac +/- 20%
50/60 Hz
< 5 VA (maximum 200 mA)
<20 ohm
0 to 16 ft/s (0 to 5 m/s)
0 to 33 ft/s (0 to 10 m/s)
(factory setting)
0 to 49 ft/s (0 to 15 m/s)
+ 0.7 ft/s (0.2 m/s + 3% of measured
value)
66 ft/s (20 m/s)
< 0.3% of measured value at< + 10°
ca. 4 seconds
0 to 10 Vdc
+ 1 mA
164 ft (50 m)
492 ft (150 m)
984 ft (300 m)
3 ft (1 m) (prewired)
Siemens Industry, Inc.

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