Section 1
Introduction
7
FT742-SM (RS422 & RS485) Sensors
– User Manual
1 INTRODUCTION
1.1 Product Overview
The FT742-SM is a solid-state ultrasonic wind sensor, using a patented Acoustic Resonance airflow
sensing technique to measure accurately both wind speed and direction. The sensors have been
specifically designed to operate in harsh environments including offshore and ice-prone areas. The
wind sensor has no moving parts to degrade or wear and is designed for applications requiring high
reliability. This helps reduce costly down-time and unscheduled maintenance visits.
Mounting and aligning the sensor is very simple. A wind datum feature mark can be used to align the
sensor to a reference point, while the integrated compass allows reference to magnetic North. For
operation in ice-prone areas, the FT742 is fitted with a thermostatically controlled all-body heating
system. A two-element heater is used to ensure heat is evenly distributed over the entire surface
area.
The FT742-SM allows either RS422 (full-duplex) or RS485 (half-duplex) communication outputs, this
communication setting is programmed at the factory and cannot be modified by the user.
1.2 Build Versions and Labelling
Figure 1 shows how to identify the sensor platform version and individual serial number, depending on
the attached main labels:
Additional labels may be attached.
Figure 1: Main Sensor Labels
1.3 Scope of Use
The sensor is designed, manufactured and optimised for high availability.
No promise in part or full can be given to guarantee a sensor’s continuous operation, as exceptional
circumstances can occur that may result in the failure of the output from a sensor. Exceptional
circumstances can include:
Poor installation
Inadequate inspection
Power supply failures
Poor quality electrical connections
Lightning exposure
Problematic environmental conditions or combination of conditions
Physical Damage
