Chapter 4 – Service, Configuration & Testing
28 FT742-DM (4-20mA) – Sensors - User Manual
Note 4) Alternatively connect a 50Ω resistor in place of the ammeter and measure the voltage across the
resistor with a DC voltmeter or oscilloscope.
Quick Start Steps:
1. Switch off the power supply.
2. Remove the sensor and FT055 cable from its packaging and mate the connectors together.
3. Connect the +24VDC terminal of the power supply (current limit set to 6A) to the white wire and 0V
terminal to the brown wire.
4. Connect the yellow wire (wind speed 4-20mA output) to the +24VDC terminal on the power supply.
5. Connect the green wire (wind speed 4-20mA output) to an ammeter and then connect the other terminal
on the ammeter to the 0V terminal on the DC power supply.
6. Connect the purple wire (wind direction 4-20mA output) to the +24VDC terminal on the power supply.
7. Connect the grey wire (wind direction 4-20mA output) to an ammeter and then connect the other
terminal on the ammeter to the 0V terminal on the DC power supply.
Perform a final check all the wires are connected, then switch on the power supply and monitor the air flow
measured on the ammeter outputs.
Warning: Live connection/disconnection of the power and/or sensors during live operation, or miswiring
of the power leads could damage the equipment and is not covered by FT’s standard warranty terms.
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