HD 103T.0_1

HD 103T.0 – Active Air Speed Transmitter

The HD103T.0 measures air speed by using an omnidirectional hotwire probe. It has
three confi gurable analogue outputs: 4…20mA and 0…20mA current outputs and
0…10Vdc voltage output (0…1Vdc or 0…5Vdc outputs can be supplied on request).
The output can be chosen by using the jumpers inside the instrument.
The sensor set at the top of the probe is very delicate and must be protected with
the special protection provided with the instrument. During transport, the sensor is
enclosed in a cylinder screwed on the top of the probe; during installation, remove
the protection and apply the protective cover in its place.

Product Description

The HD103T.0 measures air speed by using an omnidirectional hotwire probe. It has
three configurable analogue outputs: 4…20mA and 0…20mA current outputs and
0…10Vdc voltage output (0…1Vdc or 0…5Vdc outputs can be supplied on request).
The output can be chosen by using the jumpers inside the instrument.
The sensor set at the top of the probe is very delicate and must be protected with
the special protection provided with the instrument. During transport, the sensor is
enclosed in a cylinder screwed on the top of the probe; during installation, remove
the protection and apply the protective cover in its place.

Installation notes
• Select the type of air speed and temperature output by using the jumpers placed
on the board.
• The probe must be used with clean air only and humidity below 80%.
• The transmitters are factory calibrated and no further adjustments are required.
• Each instrument is calibrated with its own probe. Don’t mix up probes and instruments:
the calibration will have to be repeated.
Electrical connections
Power supply
Power the instrument at the voltage shown in the electrical specifi cations.
Analogue output
The output signal comes from m/s and GND terminals for air speed, from °C and GND
for temperature.
ORDERING CODES
HD103T.0: Active air speed and temperature transmitter. Analogue outputs: 4…20mA,
0…20mA and 0…10Vdc selected by jumper. Omnidirectional probe with wired
protective cover Ø=80mm connected to the electronics through a 5-metre cable.
Air speed range 0.1…5m/s. Temperature output range -20…+80°C. Power
supply 24Vac (115 and 230Vac on request). Probe operating temperature
-10…+80°C, electronics operating temperature -5…+50°C.

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