The EE75 series air velocity transmitters were developed to obtain accurate measuring results over a wide range of velocities and temperatures.
A high-quality hot film sensor element based on cutting-edge thin film technology ensures maximum sensitivity, even at lowest mass flows. At the same time, the innovative probe design produces reliable measuring results at high flow velocities of up to 40m/s (8000ft/min). The integrated temperature compensation minimises the temperature cross-sensitivity of the EE75 series which, combined with the robust mechanical design, allows it to be used at process temperatures between -40 to +120 °C (-40 to 248 °F).
In addition to air velocity and temperature values, the transmitter calculates the volumetric flow rate in m³/min or ft³/min. The cross section of the duct needs to be determined for this purpose and the volumetric flow rate can be displayed and directed to one of the analogue outputs.
The configuration software included in the scope of supply allows to choose the appropriate output parameter and freely scale the display range and signal level of the two analogue outputs. In addition user-friendly calibration of the air velocity and temperature and the adjustment of key parameters (e.g. response time of the velocity measurement, low flow cut-off points, etc.) are supported as well. An optional illuminated display with two control buttons integrated in the cover is available. In addition, this enables changes of the configuration to be made directly on the unit.
The EE75 series has a robust metal housing to protect against possible damage in rough industrial environments. There are four different models, providing a comprehensive range of mounting options:
Model A for wall mounting
Model B for duct mounting
Model C with remote probe
Model E with remote probe, pressure-tight up to 10bar (145psi)
The EE75 series can be used to measure the velocity of other gasses as well, although a correction has to be applied to the unit at the factory.
Measuring range from -40 °C (-40 °F) up to 120 °C (248 °F) and 10 bar (145 psi)
Accurate measurement of air flows from0.06 m/s up to 40 m/s (12...8000 ft/min)
Low angular dependency
Long-term stable
Adjustment and Configuration:
v and T adjustment
Scalable measuring range
Selectable output signal
Response time
Calulation of volume flow
Application Specific Design:
Duct mount and remote probe types with different probe lengths
Pressure tight remote probes up to 10 bar (145 psi)
Various cable lengths for remote probe types
Process connection with stainless steel flange or G 1/2" ISO/ 1/2" NPT thread
Air Velocity (v):
Measuring range:
0...2 m/s (0...400 ft/min)
0...10 m/s (0...2 000 ft/min)
0...40 m/s (0...8 000 ft/min)
Accuracy: in air at 25 °C (77 °F) and 1 013 hPa (14.7 psi), including non-linearity, hysteresis and repeatability
0.06...2 m/s (12...400 ft/min)
0.15…10 m/s (30…2000 ft/min)
0.20…40 m/s (40…8000 ft/min)
±0.03 m/s (6 ft/min)
±(0.10 m/s (20 ft/min) + 1 % of mv)
±(0.20 m/s (40 ft/min) + 1 % of mv) mv = measured value
Uncertainty of factory calibration: ±1 % of mv, min. 0.015 m/s (3 ft/min) mv = measured value
Dependency:
of inflow angle (α): <3 % for α <20°
of inflow direction: <3 %
Response time t90, typ.: <1.5...40 s (Factory setting: 1.5 s, configurable via EE75 Configuration Software)
Temperature (T):
Measuring range: -40...+120 °C
Accuracy in air at 25 °C (77 °F) at air flows ≥0.45 m/s (886 ft/min): ±0.5 °C (±0.9 °F)
Temperature dependency of electronics, typ.: ±0.005 % of mv/K deviating from 25 °C (77 °F) mv = measured value
Temperature dependency of probe, typ.: ±0.1 % of mv/K deviating from 25 °C (77 °F) mv = measured value
Response time t90, typ.: ≤10 s
Outputs:
Analogue:
Two freely selectable and scalable outputs for v, T, V': 0 - 10 V -1 mA < IL < 1 mA IL = load current; 0 - 20 mA / 4 - 20 mA (3-wire) RL ≤ 350 Ω RL = load resistance
General:
Power supply class III USA & Canada: Class 2 supply necessary: 24 V DC ±20 %
Current consumption, typ. With Display: <100 mA; <160 mA
Temperature working range: Probe cable: -40…+105 °C (-40…+221 °F); Enclosure:-40…+60 °C (-40…+140 °F); Enclosure with display: -30…+60 °C (-22…+140°F).
Pressure working range: T2, T3:700...1 300 hPa (10.2...18.9 psi); T26:Pressure tight 0.05...10 bar (0.73...145 psi)