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6.2.5 Wind speed measurement
The instrument works with hot-wire and vane probes fitted with the SICRAM module.
The SICRAM module acts as an interface between the sensor on the probe and the instrument.
There is a microprocessor circuit with a permanent memory inside the module that enables the
instrument to recognize the type of probe connected and to read its calibration information.
Note: The vane probes can be exclusively connected to input 8.
The probe is detected during turn on, and this cannot be performed when the instrument is
already on, therefore if a probe is connected and the instrument is on, it is necessary to turn it
off and on .
The AP471 and AP472 series probes measure the incident wind speed and flow rate; some also
measure air temperature. The hot-wire measurement principle is used for the AP471 series and the
vane principle for the AP472 series. On request, the probes of the AP471 series can be fitted with a
telescopic rod that eases measurements in areas difficult to reach (for example vents).
The typical applications are wind speed and flow rate checks in air conditioning, heating and
cooling systems, or environmental comfort determination, etc.
In addition, the measured fluid temperature must be considered: the probes measure air flows at
80°C maximum temperature.
The measurements provided by the instrument using the probes are: wind speed, flow rate, and air
temperature.
The following units of measurement are available:
•
for wind speed: m/s - km/h - ft/min - mph (miles/hour) - knots;
•
for air temperature: °C and °F;
•
for flow rate: l/s (liters/s) - m
The flow rate measurement requires knowledge of the duct or vent area orthogonal to the flow: the
menu item " SECT " define the section area m
open the Shortcut menu by pressing SHIFT FNC. The Shortcut menu will appear:
Use the ▲▼ navigation keys to select section and press Enter. The following screen will appear:
HD32.1
3
3
3
/s - m
/min - m
/h - ft
2
or inch
- 72 -
3
3
/s - ft
/min
2
. In order to set this section, you have to
V2.1
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