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KA01748F/00/EN/01.25-00
71695942
2025-02-12
Products
Brief Operating Instructions
Liquiphant FailSafe FTL81
Vibronic
Level switch in liquids
These Brief Operating Instructions are not a
substitute for the Operating Instructions
pertaining to the device.
Detailed information can be found in the
Operating Instructions and the additional
documentation.
Available for all device versions via:
• Internet:
• Smartphone/tablet: Endress+Hauser
Operations app
Solutions
www.endress.com/deviceviewer
Services
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Related Manuals for Endress+Hauser Liquiphant FailSafe FTL81
Summary of Contents for Endress+Hauser Liquiphant FailSafe FTL81
- Page 1 Products Solutions Services KA01748F/00/EN/01.25-00 71695942 2025-02-12 Brief Operating Instructions Liquiphant FailSafe FTL81 Vibronic Level switch in liquids These Brief Operating Instructions are not a substitute for the Operating Instructions pertaining to the device. Detailed information can be found in the Operating Instructions and the additional documentation.
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Page 2: Related Documents
Related documents Liquiphant FailSafe FTL81 Related documents Order code: XXXXX-XXXXXX Ser. no.: XXXXXXXXXXXX Ext. ord. cd.: XXX.XXXX.XX Serial number www.endress.com/deviceviewer Endress+Hauser Operations App A0023555 About this document Symbols 2.1.1 Warning symbols DANGER This symbol alerts you to a dangerous situation. Failure to avoid this situation will result in serious or fatal injury. - Page 3 Liquiphant FailSafe FTL81 About this document This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in serious or fatal injury. CAUTION This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in minor or medium injury.
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Page 4: Basic Safety Instructions
Basic safety instructions Liquiphant FailSafe FTL81 Basic safety instructions Requirements for the personnel The personnel must fulfill the following requirements to carry out the necessary tasks, e. g., commissioning and maintenance: ‣ Trained, qualified specialists must have a relevant qualification for the specific function and task ‣... -
Page 5: Product Safety
It meets the general safety standards and legal requirements. It also complies with the EU directives listed in the device-specific EU Declaration of Conformity. Endress+Hauser confirms this by affixing the CE mark to the device. Functional safety SIL The Functional Safety Manual must be strictly observed for devices that are used in functional safety applications. -
Page 6: Incoming Acceptance And Product Identification
All of the information on the measuring device is displayed along with an overview of the scope of technical documentation provided. • Enter the serial number on the nameplate into the Endress+Hauser Operations app or scan the 2-D matrix code on the nameplate with the Endress+Hauser Operations app 4.2.1... -
Page 7: Installation
Liquiphant FailSafe FTL81 Installation 4.3.3 Transporting the device • Transport the device to the measuring point in the original packaging • Hold the device by the housing, temperature spacer, flange or extension pipe • Do not hold the device by the vibrating fork! •... -
Page 8: Installation Requirements
Installation Liquiphant FailSafe FTL81 A0042153 2 Installation examples for a vessel, tank or pipe Installation requirements 5.1.1 Vessel with heat insulation If process temperatures are high, the device should be incorporated in the usual vessel insulation system to prevent the electronics from heating as a result of thermal radiation or convection. - Page 9 Liquiphant FailSafe FTL81 Installation 5.1.2 Take switch point into consideration The following are typical switch points, depending on the orientation of the level switch. Minimum distance between the tuning fork and the tank wall or pipe wall: 10 mm (0.39 in) A0018008 ...
- Page 10 Installation Liquiphant FailSafe FTL81 > 25 (0.98) A0033297 5 Example of installation for low-viscosity liquids. Unit of measurement mm (in) High viscosity NOTICE Highly viscous liquids may cause switching delays. ‣ Make sure that the liquid can run off the tuning fork easily.
- Page 11 Liquiphant FailSafe FTL81 Installation A0033239 7 Installation examples for a highly viscous process medium 5.1.5 Take clearance into consideration A0033236 8 Take clearance outside the tank into consideration 5.1.6 Support the device Support the device in the event of severe dynamic load. Maximum lateral loading capacity of the pipe extensions and sensors: 75 Nm (55 lbf ft).
- Page 12 Installation Liquiphant FailSafe FTL81 A0031874 9 Examples of support in the event of dynamic load Marine approval: In the case of pipe extensions or sensors longer than 1 600 mm (63 in), a support is needed at least every 1 600 mm (63 in).
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Page 13: Installing The Device
Liquiphant FailSafe FTL81 Installation Installing the device 5.2.1 Required tools • Screw driver • Open-ended wrench for sensor installation : SW32 or SW41 • Allen key for housing locking screw 5.2.2 Aligning the tuning fork using the marking A0039125 11 Position of the tuning fork when installed horizontally in the vessel using the marking 5.2.3... - Page 14 Installation Liquiphant FailSafe FTL81 5.2.4 Screwing in the device • Turn by the hex bolt only, 15 to 30 Nm (11 to 22 lbf ft) • Do not turn using the housing. A0034852 13 Screwing in the device 5.2.5...
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Page 15: Electrical Connection
Liquiphant FailSafe FTL81 Electrical connection ... 300° A0018022 5.2.6 Sealing the housing NOTICE Risk of device damage due to moisture inside the housing! The O-ring seal on the housing cover can be destroyed by mineral oil-based grease. This can allow moisture to enter the housing. -
Page 16: Required Tool
Electrical connection Liquiphant FailSafe FTL81 Required tool • Screwdriver for electrical connection • Allen key for screw of cover lock Connecting protective earth (PE) The protective earth conductor at the device must only be connected if the device' s operating voltage is ≥... - Page 17 Liquiphant FailSafe FTL81 Electrical connection MIN = minimum detection: • The output switches in a safety-oriented manner when the probe is free (demand mode). • Used, for example, for dry-run protection, pump protection • Foam is not detected 6.3.7 Connection via M12 plug connector For MAX operating mode with an M12 plug connector, it is not necessary to open the housing for connection purposes.
- Page 18 Electrical connection Liquiphant FailSafe FTL81 FEL85 MIN operating mode FEL85 – + – A0018028 16 Terminal assignment with M12 connector, MIN operating mode 6.3.8 Connecting the cable Required tools • Flat-blade screwdriver (0.6 mm x 3.5 mm) for terminals •...
- Page 19 Liquiphant FailSafe FTL81 Electrical connection 24/25 mm 8.0 Nm A0056632 17 Example of coupling with cable entry, electronic insert with terminals M20 coupling (with cable entry) Maximum conductor cross-section 2.5 mm (AWG14), ground terminal inside the housing + terminals on the electronics Maximum conductor cross-section 4.0 mm...
- Page 20 Electrical connection Liquiphant FailSafe FTL81 6.3.9 Connection to the Nivotester FailSafe FTL825 FEL85 FEL85 – + – – + – (–) (–) A0018029 Minimum detection (dry-run protection) Maximum detection (overfill protection) Connection to control systems The device is suitable for connection to a programmable logic controller (PLC), a safety PLC (SPLC) or AI Modules via a 4 to 20 mA signal according to EN 61131-2 and NE06, NE043.
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Page 21: Ensuring The Degree Of Protection
Liquiphant FailSafe FTL81 Operation options 6.4.1 Device behavior in case of fault (alarm and warning) In the event of a fault the current output is in the range below 3.6 mA. Short-circuits are an exception: in this case, the current output is in the range above 21 mA. For alarm monitoring, the logic unit must be able to detect both HI alarms (≥... -
Page 22: Function Check
Commissioning Liquiphant FailSafe FTL81 Elements on the electronic insert FEL85 U= 24 (12 ... 30) VDC I = 4...20 mA – – High > I >12mA A0018032 Green LED, operation; initialization (lit), normal operation (flashes), fault (off) or flashes alternately with red LED Density ρ... - Page 23 Liquiphant FailSafe FTL81 Commissioning Setting the density range ‣ Select the density ranges for low and high densities based on the media group (e.g. liquefied gas, alcohol, aqueous solutions, acid) on the device; see Operating Instructions. WARNING If the rotary switches are not aligned parallel to each other, no valid density range is selected.
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Page 24: Proof Testing
Commissioning Liquiphant FailSafe FTL81 Proof testing NOTICE ‣ Only start the function test in the OK status. ‣ For applications involved in safety-related operation, refer to the Functional Safety Manual. The test button can be used to simulate the demand current. The output is set so that the currents of 6 mA(MAX) or 9 mA(MIN) are displayed. -
Page 25: Further Information
Liquiphant FailSafe FTL81 Commissioning 8.5.2 Behavior of the switch output and signaling in demand mode I >12 mA I >12 mA A0057192 A0057192 23 LED signaling 24 LED signaling = off = off = flashes = flashes 6.0 mA –... - Page 28 *71695942* 71695942 www.addresses.endress.com...
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