FT Technologies FT742, Manual

Page: 2 / 28

2 FT742 (4-20mA)
– DM Sensors
- User Manual
Contents
Safety Instructions ....................................................................................... 4
Consignes de sécurité ................................................................................... 5
1 INTRODUCTION ...................................................................................... 6
1.1 Product Overview ....................................................................................................6
1.2 Build Versions & Labelling .....................................................................................6
1.3 Scope of Use ............................................................................................................6
1.4 Disclaimer ................................................................................................................7
2 FUNCTIONAL DESCRIPTION ................................................................. 8
2.1 Technical Performance ...........................................................................................8
2.2 Current Loops ..........................................................................................................9
2.2.1 Current Loop Characteristics ................................................................................9
2.2.2 Using the Averaging Filter.....................................................................................9
2.2.3 Wind Speed Loop .................................................................................................9
2.2.4 Wind Direction Loop ........................................................................................... 10
2.2.5 Changing the Wind Datum Direction ................................................................. 11
2.2.6 Error Conditions ................................................................................................. 12
2.3 Heater Operation .................................................................................................. 13
2.4 Low Power Operation .......................................................................................... 13
3 MECHANICAL & ELECTRICAL INSTALLATION ................................. 14
3.1 Connector Details ................................................................................................. 21
3.2 Cable Details ......................................................................................................... 21
3.3 Lightning, Surge & EMI Protection ..................................................................... 22
4 SERVICE, CONFIGURATION & TESTING ............................................ 24
4.1 Inspection ............................................................................................................. 24
4.2 Fault Finding & Troubleshooting ........................................................................ 25
4.3 Returns .................................................................................................................. 26
4.4 The Acu Test Evaluation PC Software ............................................................... 27