10
Hardware
6.
Velocity / Temperature Calibration
The EE75 can be calibrated / adjusted using either the buttons on the optional display module or
the USB interface and configuration software provided.
Instructions for calibration:
To achieve comparable results to the E+E factory setting, please note following:
a) The adjustment should be done in a wind tunnel with homogeneous, low turbulent
flow profile.
b) Insert the probe 10cm deep into the flow channel.
c) The fixtures should be mounted outside the flow channel and should not rise into the
air stream (see drawing):
not OK
OK
6.1 Selecting the Appropriate Calibration Method
(1-point or 2-point Calibration)
The EE75 sensor can be calibrated in 2 different ways:
- 1-point v/T calibration:
Quick and easy option for obtaining precise measuring results at a specific working
point. 1-point calibration should only be used for very limited working ranges.
- 2-point v/T calibration:
With 2-point calibration, precise measuring results can be obtained over the entire
v/T measuring range. The more complicated 2-point calibration procedure is preferable
to 1-point calibration, if higher precision or a wider working range is required.
6.1.1 General Information on 1-point v/T Calibration:
If possible the selected calibration point should be similair to the working point (of the
limited working range) of the sensor.
Example: Working range v 8 - 12 m/s
(1600 - 2400 ft/min)
> calibration point at 10 m/s
(2000 ft/min)
;
working range T 18 - 22 °C
(64.4 - 71.6 °F)
- > calibration point at 20 °C
(68 °F)
.
- If the selected calibration point is < 50 % of the max. measuring range, V/T-CAL LOW
should be selected for calibration / adjustment.
- If the selected calibration point is > 50 % of the max. measuring range, V/T-CAL HIGH
should be selected for calibration / adjustment.
Example: v measuring range 0 - 10 m/s
(0 - 2000ft/min)
; actual working range 6 - 8 m/s
(1200 - 1600 ft/min)
;
selected calibration point 7 m/s
(1400 ft/min)
; perform 1-point calibration, selecting V-CAL HIGH.
Summary of Contents for EE75
Page 23: ...22 Configurations Software...
