Table of Contents
Advertisement
4.7
The low flow cut-off is intended to prevent the
display or output signal fluctuating if the flow is cut
off.
Small differences in temperature in the duct can produce small flow fluctuations, which would be
recorded by the sensor without the low flow cut-off.
(switching point OFF + hysteresis = switching point ON)
Switching point
OFF and
can be defined in the input fields of the "Switching Off"
tab.
Hysteresis:
Note:
The EE75 comes with the low flow cut-off function activated,
with a switching point OFF of 0.1 m/s
a hysteresis of 0.05 m/s
Should you require smaller flow velocities to be
displayed, deactivate the low flow cut-off (switching
point OFF + hysteresis = 0 m/s or ft/min.).
4.8
The EE75 measures air velocity [m/s] temperature-
independent, but pressure-dependent and is
standardised to 45 % relative
pressure of 1013 mbar at the factory.
If e.g. the media pressure is significantly different, the actual values can be defined in the input field
on the "Mediacorr." tab to obtain the best possible measuring results.
4.9
Velocity and temperature calibration is not only possible using the buttons on the integrated display,
the EE75 can also easily be calibrated / adjusted using the configuration software.
Note:
The configuration software automatically distinguishes between the low and high calibration points.
- If the selected calibration point is BELOW the centre of the measuring range, it is automatically
recognised as the "low calibration point" (CAL LOW).
- If the selected calibration point is ABOVE the centre of the measuring range, it is automatically
recognised as the "high calibration point" (CAL HIGH).
Example:
EE75 T3***HV23: Measuring range = 0 - 2 m/s
- 0.5 m/s
- 1.6 m/s
Configurations Software
Switching Off
.
(10ft/min)
Media Correction
humidity and air
Calibration
measuring range = 1 m/s
-> calibration point lies below 1 m/s
(100 ft/min)
-> calibration point lies above 1 m/s
(300 ft/min)
active
and
(20ft/min)
-> centre of
(0 - 400 ft/min)
(200 ft/min)
(200 ft/min)
(200 ft/min)
19
switching point OFF
hysteresis
switching point ON
-> CAL LOW
-> CAL HIGH
Advertisement
Table of Contents
