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FT742 (4-20mA)

– DM Sensors

- User Manual

FT TECHNOLOGIES LTD.
SUNBURY HOUSE
BROOKLANDS CLOSE
SUNBURY-ON-THAMES
MIDDLESEX TW16 7DX

TEL: +44 (0)20 8943 0801

FAX: +44 (0)20 8943 3283

WEB:

www.fttechnologies.com

E-MAIL: [email protected]

A4277-3-EN
November 2017
The FT and Acu-Res logos are registered trademarks of FT Technologies Ltd.
Copyright © 2017 FT Technologies Ltd. All rights reserved.

FT742 - Analogue (4-20mA) Wind Sensor Manual

Direct-Mount Variant

Содержание FT742

Страница 1: ...7DX TEL 44 0 20 8943 0801 FAX 44 0 20 8943 3283 WEB www fttechnologies com E MAIL info fttechnologies com A4277 3 EN November 2017 The FT and Acu Res logos are registered trademarks of FT Technologies...

Страница 2: ...aracteristics 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...

Страница 3: ...This product complies with the RoHS2 2011 65 EU directive limination du produit Conform ment la directive europ enne 2012 19 EU relative aux d chets d quipements lectriques et lectroniques DEEE ces co...

Страница 4: ...1 Standards it must be o Connected to an appropriately approved isolated power supply for example UL CSA IEC 60950 1 2005 A1 2009 A2 2013 rated 12 30VDC and be current limited 6A Max o Protected by U...

Страница 5: ...nnect une alimentation agr e convenablement isol e par exemple UL CSA IEC 60950 1 2005 A1 2009 A2 2013 de tension nominale 12 30 VCC et avec courant limit 6 A max o Prot g par des dispositifs de prote...

Страница 6: ...trol applications The FT742 FF and FT742 PM ranges are designed for this application The standard FT742 DM when installed to FT Technologies recommendations is electrically isolated from the mounting...

Страница 7: ...design The Purchaser assumes all risks and liability in conjunction with the use of the information given Any warranty given by FT Technologies in respect of the equipment is conditional upon the sens...

Страница 8: ...for the sensor 2x current loops 4 20mA Supply Current Heater on 6A max 5 The heater is thermostatically controlled Heater power consumption will depend on the heater energy required to keep the senso...

Страница 9: ...te of 10 times per second An average of several readings should always be used for any calculations because single readings can accidentally become corrupted see Section 2 2 6 2 2 2 Using the Averagin...

Страница 10: ...lent to the maximum speed The wind speed loop can also be calibrated with non linear scaling functions For further information on this advanced feature contact FT Technologies If a wind sensor is repl...

Страница 11: ...ion crosses the datum In the 12mA datum current mode the output current varies linearly about the 12mA value as the wind direction moves around the datum 2 2 5 Changing the Wind Datum Direction The da...

Страница 12: ...cable or wind sensor It is important that error flags are not ignored The datalogger should be able to recognise and interpret error codes within the data If errors are ongoing more than several secon...

Страница 13: ...e length FT recommends cable types in Section 3 2 Since the heater circuit is thermostatically controlled the actual power being drawn from the supply will depend on the programmed set point and the e...

Страница 14: ...alignment marking and the alignment flat The magnetic North marking indicates 0 and rotates clockwise when viewed from above Figure 10 The alignment flat is used with a square sided compass for rotati...

Страница 15: ...the annual inspection of the sensor as detailed in Section 4 2 The FT035 grounding accessory can be fitted within the connector chamber and can provide a low resistance grounding path to the outer ed...

Страница 16: ...Chapter 3 Mechanical Electrical Installation 16 FT742 DM 4 20mA Sensors User Manual...

Страница 17: ...Chapter 3 Mechanical Electrical Installation 17 FT742 DM 4 20mA Sensors User Manual Figure 9 Direct Mount Wind Sensor mm...

Страница 18: ...DM 4 20mA Sensors User Manual The sensor measures the wind direction relative to the central datum feature When the wind sensor is correctly aligned the wind direction measurements will be as shown i...

Страница 19: ...self locking fasteners 4x part FT034 ensuring an even distribution of pressure and firm contact with the mounting pipe The fixings use a thread locking insert and will provide resistance before they a...

Страница 20: ...Chapter 3 Mechanical Electrical Installation 20 FT742 DM 4 20mA Sensors User Manual Figure 12 Direct Mount Compass Alignment...

Страница 21: ...1 8 0mm ODU 4 20mA Cable Side Connector 8 way plug SX2F1C P08NJH9 0001 9 2mm Figure 14 Cable Connector Sourcing Options 3 2 Cable Details The mating connectors for the sensors are suitable for use wit...

Страница 22: ...or is a minimum of 30x diameter of the interceptor material The standard FT742 DM sensor has a hard anodised top surface within the connector column housing see Figure 9 When used with the plastic pip...

Страница 23: ...nclosure chassis All connections from the sensor to the data acquisition system and to power should pass through the SPD s This will suppress any unwanted overvoltage transients present on the signal...

Страница 24: ...hydrophobic cavity coating for wear corrosion and damage Corrosion Inspect the mounting surface of the sensor and the surfaces of other mounting parts for signs of corrosion If corrosion is present o...

Страница 25: ...FT031 Size Adaptor 25mm 1 for FT742 DM includes a FT033 tapered pipe insert 4x FT034 self locking fasteners FT032 Size Adaptor 50mm 2 for FT742 DM includes a FT033 tapered pipe insert 4x FT034 self lo...

Страница 26: ...ocessed in accordance with guidelines in Sections 2 2 1 and 2 2 6 Check that the measurement cavity s special coating is in a satisfactory condition Debris can be blown out or washed out with distille...

Страница 27: ...lied on a CD and will work on PCs running Windows XP Vista 7 8 8 1 and 10 The sensors can be easily tested by connecting a DC ammeter in series with each current loop A positive supply must be provide...

Страница 28: ...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 2...

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