Datasheet
122
v1.3 / Modification rights reserved
EE671
EE671 is a compact air velocity probe for HVAC applica-
tions. The built-in flow sensing element VTQ combines the
advantages of state-of-the-art E+E thin-film manufacturing
and of the newest transfer molding technology.
It operates on the hot-film anemometer principle and
ensures high accuracy and reproducibility as well as long-
term stability and outstanding resistance to pollutants.
EE671 is available with fix installed cable or with plug con-
nection. The measured air velocity up to 20 m/s
(4000 ft/min) is
available as linear voltage output 0 - 1 V, 0 - 5 V or 0 - 10 V.
The alignment strip on the probe and the matching mounting
flange within the scope of supply simplify installation and
correct positioning in the air flow. The flange enables the
immersion depth to be infinitely variable.
With an optional configuration kit the user can set via a dig-
ital setup interface the output configuration and perform an
adjustment of the probe.
EE671
EE671
HVAC Miniature Air Flow Transmitter
Flow measurement
Measurement range
1)
0... 5 m/s (0...1000 ft/min)
0... 10 m/s (0...2000 ft/min)
0... 15 m/s (0...3000 ft/min)
0... 20 m/s
(0...4000 ft/min)
Output signal
1)
0 - 1 V (max. 1 mA)
0 - 5 V (max. 1 mA)
0 - 10 V
2)
(max. 1 mA)
Accuracy
3)
0.5...5 m/s (100...1000 ft/min): ±(0.2 m/s / 40 ft/min + 3 % of measured value)
at 20 °C (68 °F) / 45 % rh and 1013 hPa (14.7 psi) 1... 10 m/s (200...2000 ft/min): ±(0.3 m/s / 60 ft/min + 4 % of measured value)
1... 15 m/s (200...3000 ft/min): ±(0.35 m/s / 70 ft/min + 5 % of measured value)
1... 20 m/s
(200...4000 ft/min): ±(0.4 m/s / 80 ft/min + 6 % of measured value)
Response time τ
90
typ. 4 s
General
Supply voltage 10...29 V DC SELV
Current demand max. 50 mA at 20 m/s (4000 ft/min)
Temperature range operation: -20...60 °C (-4...140 °F)
storage: -30...60 °C (-22...140 °F)
Operating range humidity 5...95 % rh (non-condensing)
Connection
Cable version 0.5 m (1.6 ft) / 2 m (6.6 ft) cable, PVC, temperature-flexible,
5x0.25 mm² (AWG 23) with ferrules
Plug version M12 connector system, 5-pin
Electromagnetic compatibility
4)
EN61326-1
EN61326-2-3
Material / protection class polycarbonate / IP50 (probe head); IP54 (housing)
1) See ordering information
2) Only at supply voltage V+ ≥ 15 V
3) The accuracy statement includes the uncertainty of the factory calibration with an enhancement factor k=2 (2-fold standard deviation). The tolerance was calculated in
accordance with EA-4/02 following the GUM (Guide to the Expression of Uncertainty in Measurement).
4) The EE671 is not short-circuit-proof and not surge-proof (ESD-sensitive device).
Technical Data
Heating and ventilation systems
Flow monitoring and control
Inlet air monitoring in ovens
Typical Applications Features
High accuracy and long-term stability
Outstanding resistance to contamination
Easy and quick mounting
User configurable
EE671
VTQ