Endress+Hauser LT5 Brief Operating Instructions
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Endress+Hauser LT5 Brief Operating Instructions

Float level gauge
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KA01676G/00/EN/01.23-00
71629416
2023-10-06
Products
Brief Operating Instructions
Float level gauge LT5
Mechanical tank gauge for measuring liquid level
These Instructions are Brief Operating Instructions; they are
not a substitute for the Operating Instructions pertaining to
the device.
Detailed information about the device can be found in the
Operating Instructions and the other documentation:
Available for all device versions via:
• Internet:
www.endress.com/deviceviewer
• Smart phone/tablet: Endress+Hauser Operations App
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Summary of Contents for Endress+Hauser LT5

  • Page 1 Operating Instructions pertaining to the device. Detailed information about the device can be found in the Operating Instructions and the other documentation: Available for all device versions via: • Internet: www.endress.com/deviceviewer • Smart phone/tablet: Endress+Hauser Operations App...
  • Page 2 Float level gauge LT5 Order code: XXXXX-XXXXXX Ser. no.: XXXXXXXXXXXX Ext. ord. cd.: XXX.XXXX.XX Serial number www.endress.com/deviceviewer Endress+Hauser Operations App A0023555 Endress+Hauser...

  • Page 3: Table Of Contents

    Float level gauge LT5 Table of contents Table of contents Document information ............4 Symbols used .

  • Page 4: Document Information

    Document information Float level gauge LT5 Document information Symbols used 1.1.1 Safety symbols DANGER This symbol alerts you to a dangerous situation. Failure to avoid this situation will result in serious or fatal injury. WARNING This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in serious or fatal injury.
  • Page 5 Float level gauge LT5 Document information Torx screwdriver Allen key Open-ended wrench 1.1.4 Symbols for certain types of information and graphics  Permitted Procedures, processes or actions that are permitted  Preferred Procedures, processes or actions that are preferred  Forbidden Procedures, processes or actions that are forbidden  Tip...

  • Page 6: Documentation

    Document information Float level gauge LT5 Documentation The following documents can be accessed from the download area of the Endress+Hauser website (www.endress.com/downloads). For an overview of the enclosed relevant technical documentation, refer to the following: W@M Device Viewer (www.endress.com/deviceviewer): Enter the serial number on the nameplate.

  • Page 7: Basic Safety Instructions

    Float level gauge LT5 Basic safety instructions Basic safety instructions Requirements for personnel The personnel for installation, commissioning, diagnostics and maintenance must fulfill the following requirements: ‣ Be specialists who are trained and have a relevant qualification for this specific function and task.

  • Page 8: Operational Safety

    Product description Designated use Float level gauge LT5 is an important measuring instrument in the process industry. The mechanical construction does not require a power supply and it is easy to install. Since it can be used for high-precision liquid level measurement and remote indication detection, it is ideal for the following operations: •...

  • Page 9: Delivery Examples

    Float level gauge LT5 Product description Delivery examples The packaging method will vary depending on the order code, etc. For flange type, the sheave elbow will be delivered in a separate packaging box. A0039945  1 Packaging Gauge supporter Anchor hook...

  • Page 10: Incoming Acceptance And Product Identification

    • Do the nameplate data match the ordering information on the delivery note? • If required (see nameplate): Are the Safety Instructions (XA) enclosed? If one of these conditions is not satisfied, contact your Endress+Hauser Sales Center. Product identification The following options are available for identification of the device: •...

  • Page 11: Installation

    Float level gauge LT5 Installation Installation Measuring tape and wire lengths The lengths of the measuring tape and wire are longer than the actual measurable lengths for piping purposes, and they vary depending on the option. The following tables show the actual lengths according to options in 060 for each option of specification 070.
  • Page 12 Installation Float level gauge LT5 3. Measuring tape SUS316, seal pot/BT 060 measurement Length (total Perforated tape Non-perforated Spare parts range length) (measurement tape length) 2.5 m 24 m 17 m Contact Endress+Hauser 24 m 17 m Contact Endress+Hauser 10 m...
  • Page 13 Float level gauge LT5 Installation Length (total Perforated tape Non- Wire Spare parts measurement length) (measurement perforated tape range length) 60 ft 154.19 ft 67.91 ft 67.91 ft 86.30 ft Contact Endress+Hauser 100 ft 226.37 ft 107.28 ft 67.91 ft 118.11 ft...

  • Page 14: Sealing Materials For Wetted Liquid And Wetted Gas Parts

    Installation Float level gauge LT5 Sealing materials for wetted liquid and wetted gas parts 5.2.1 List of materials Product Component Name of sealing material Type of sealing material Packing and O-ring name name materials LT5-1 Gauge head Rear cover Cover packing...

  • Page 15: Material Certificates

    Float level gauge LT5 Installation Product Component Name of sealing material Type of sealing material Packing and O-ring name name materials Bearing O-ring PTFE Top anchor Aluminum-flange integrated Spring negator packing PTFE type Stainless steel, flange welding type LT5-6 90° sheave...

  • Page 16: Guide Wire Installation

    Installation Float level gauge LT5 Guide wire installation Installation procedure • Do not bend the guide wires. • Install one of the two guide wires in the perpendicular direction and the other guide wire in the parallel direction. • Use two packings between the top anchor and the mounting flange on the tank side with a washer in between the two packings.
  • Page 17 Float level gauge LT5 Installation Cut and bend the tip of the guide wire so that it does not get caught on the float.  The tip of the guide wire is connected to (b) so that it is smaller than the dimension of the anchor hook (a).
  • Page 18 Installation Float level gauge LT5 Tighten nut [3] to fully activate the spring.  A0041207  4 Guide wire installation 2. Unit of measurement mm (in) Nut 1 Nut 2 Nut 3 This completes the guide wire installation process. Endress+Hauser...

  • Page 19: Measuring Tape And Measuring Wire Installation

    Float level gauge LT5 Installation Measuring tape and measuring wire installation • Never bend or damage the measuring tape. • Ensure that the measuring tape does not become twisted inside the tank or while the pipes are being laid out.
  • Page 20 Installation Float level gauge LT5 A0041208  5 Measuring tape preparation. Unit of measurement mm (in) Perforation Sheave elbow Cover Endress+Hauser...
  • Page 21 Float level gauge LT5 Installation 5.5.1 Cone roof tank Installation procedure Feed one end of the measuring tape (non-perforated side) into the tank from the sheave elbow on the tank roof. Pass the other end of the tape (perforated side with a looped end) through the sheave elbow on the gauge head to insert it in the gauge head.
  • Page 22 Installation Float level gauge LT5 A0041210  7 Measuring tape and measuring wire installation: measuring tape + measuring wire. Unit of measurement mm (in) Guide pipe Endress+Hauser...
  • Page 23 Float level gauge LT5 Installation 5.5.2 Measuring tape and float connection procedure Bend the measuring tape at 65 mm (2.56 in). Bend the measuring tape again at 65 mm (2.56 in). Bend the twice-folded measuring tape at the center. Pass the folded measuring tape through the joint shaft.
  • Page 24 Installation Float level gauge LT5 A0041211  8 Measuring tape and float connection. Unit of measurement mm (in) Measuring tape clamp Screw thread Endress+Hauser...
  • Page 25 Float level gauge LT5 Installation 5.5.3 Floating roof tank Installation procedure Pass the measuring wire through the sheave elbow on the tank roof from the 90° sheave elbow on the gauge head, and feed one end of the measuring wire into the tank.
  • Page 26 Installation Float level gauge LT5 950 (37.4) Ø70 PCD.44 (2.76) (9.84) Ø10 (0.39) Ø400 (15.74) (17.32) >520 (20.47) A0041203  9 Measuring tape installation. Unit of measurement mm (in) Wire guide metal Top of the float Measuring wire hook Roof stand...
  • Page 27 Float level gauge LT5 Installation Measuring tape Gauge supporter Gauge head Endress+Hauser...
  • Page 28 Installation Float level gauge LT5 5.5.4 Medium/high-pressure tank • Never bend or damage the measuring tape. • Ensure that the measuring tape does not become twisted inside the tank or while the pipes are being laid out. • Approximately half of the measuring tape is perforated with small holes at 20 mm (1 in) intervals.
  • Page 29 Float level gauge LT5 Installation A0041212  10 Gland fixing tool Before tightening After tightening O-ring Gland Gland fixing tool A0041213  11 LT components Measuring tape Sprocket Tape drum Tape-holding screw Lock screw Tape guide Dust protector Endress+Hauser...
  • Page 30 Installation Float level gauge LT5 A0041214  12 Measuring tape installation Guide wire Measuring tape Cut the measuring tape after connecting it to the gauge head, leaving approximately 1.5 m (4.92 ft) from the connection to the float. Endress+Hauser...
  • Page 31 Float level gauge LT5 Installation 5.5.5 Internal adjustments Tape guide adjustment procedure Turn the tape drum inside the gauge head in the direction of the arrow in the diagram below to make the measuring tape taut.  A0041215  13...
  • Page 32 Installation Float level gauge LT5 2 (0.08) 2 (0.08) A0041216  14 Tape guide adjustment. Unit of measurement mm (in) Sprocket Measuring tape Mounting screw Measuring tape Tape guide Endress+Hauser...
  • Page 33 Close the gauge head cover. For LT5-4/LT5-6, close the cover' s gland. This completes the conster' s installation procedure. Tank height (measuring span) - Actual liquid level Number of turns = 0.6 (unit: m)
  • Page 34 Installation Float level gauge LT5 A0041218  15 Conster installation Small conster drum Lock screw Large conster drum Endress+Hauser...

  • Page 35: Liquid Sealant For Seal Pot

    Float level gauge LT5 Installation Liquid sealant for seal pot 5.6.1 Filling seal pot with liquid sealant (when installing a new gauge) Liquid sealant filling procedure Install the entire LT system, including the seal pot and float.  Parts shown in the figure may be different depending on the selected order code.
  • Page 36 Installation Float level gauge LT5 Hoist the float up and down manually to confirm that the dial (or counter) display changes accordingly.  950 (37.4) (8.66) (8.66) 250 (9.84) Ø400 (15.74) (17.32) A0041198  16 LT with a seal pot. Unit of measurement mm (in)
  • Page 37 Float level gauge LT5 Installation After checking the operation of LT, remove the cover of the 90° sheave elbow for the seal pot and inject the liquid sealant.  Note that checking the operation of LT after filling it with liquid sealant may cause the liquid sealant to leak through the measuring tape.
  • Page 38 Installation Float level gauge LT5 A0041220  18 Amount of liquid sealant Scale for liquid sealant To the LT5 side To the tank Liquid sealant 90 ° sheave elbow cover Operating the tank without filling it with liquid sealant will cause corrosion of the LT, the sheave elbow' s packing and O-rings due to the gas components inside the tank, which will result in malfunction.
  • Page 39 Float level gauge LT5 Installation 5.6.2 Filling seal pot with liquid sealant (for an installed gauge) Liquid sealant filling procedure NOTICE Used liquid sealant may have become mixed with liquids in the tank, turning it into a hazardous substance. ‣...
  • Page 40 Installation Float level gauge LT5 A0041220  20 Filling with liquid sealant Scale for liquid sealant To the LT5 side To the tank Liquid sealant 90 ° sheave elbow cover Endress+Hauser...

  • Page 41: Commissioning

    Float level gauge LT5 Commissioning Commissioning Dial display Pointer setting and scale reading procedure When calibrating (pointer setting) to the value that has been determined as the calculated value or measured value, the calibration procedure will vary depending on whether it is for a dial display or a counter display.
  • Page 42 Commissioning Float level gauge LT5 A0041231  21 Dial display (scale plate for 5 m (16.4 ft)) Long needle (white) Example: 10 mm position Short needle (green) Cap nut Endress+Hauser...

  • Page 43: Counter Display

    Float level gauge LT5 Commissioning Counter display Counter display procedure • The scale plate (one scale notch: 1 mm (0.04 in)) can rotate freely. • The counter drum changes one digit on the first drum for every notch (100 mm (3.94 in)) the scale plate moves.
  • Page 44 Commissioning Float level gauge LT5 A0041232  22 Counter display Counter (yellow) Counter (black) Pointer (red) Thread Range (yellow) No. 1 drum No. 2 drum No. 3 drum When the pointer (red) is pointing towards the yellow section, the counter will read the value on the yellow side, and when it is pointing towards the black section, it will read the value on the black side.

  • Page 45: Indicator Calibration

    Float level gauge LT5 Commissioning Indicator calibration The following three methods can be used to calibrate indicators on level gauges, but a universal procedure applies to the operation of the indicators. • Fill the tank with actual liquid and calibrate the indicator based on the measured volume •...
  • Page 46 Commissioning Float level gauge LT5 A0041235  23 Indicator calibration on a spherical tank Center of the tank Center of float installation Endress+Hauser...
  • Page 47 Equation: For the φ400 mm (15.75 in) float of LT5-1 5 000 g (11.02 lb) Float draft when the tank is empty W - T ρ...
  • Page 48 Ø400 (15.74) A0041238  24 Graph of LT5-1 φ400 mm (15.75 in) float: Density of the measured liquid ρ (g/cm3). Measurement unit: mm (in) Draft surface at density ρ Water (draft surface when the density is 1.0 g (0.002 lb)/cm Equation: For the φ140 mm (5.51 in) float of LT5-1 2 100 g (4.63 lb)
  • Page 49 Float level gauge LT5 Commissioning Float draft when the tank is empty Waterline cross section 153.94 cm Tape tension 1 200 g (2.65 lb) Density of the ρ 1 g (0.002 lb)/cm (assuming "empty = water") measured liquid Correction of indicated value with simulated actual liquid Lb = Lf (water) - Lf (actual liquid) = 14.61 mm...
  • Page 50 Commissioning Float level gauge LT5 　 　 Ø140 (5.51) Ø140 (5.51) A0041241  25 Indicator value when the tank is filled with water. Measurement unit: mm (in) Draft surface at density ρ Water (draft surface when the density is 1.0 g (0.002 lb)/cm...
  • Page 51 Float level gauge LT5 Commissioning Equation: For the φ400 mm (15.75 in) float of LT5-4/LT5-6 8 300 g (18.30 lb) Float draft when the tank is empty W - T ρ Lf = = 80.11mm Float diameter 400 mm (15.75 in) Float height 200 mm (7.87 in)
  • Page 52 Ø400 (15.74) A0041243  26 Graph of LT5-4/LT5-6 φ400 mm (15.75 in) float: Density of the measured liquid ρ (g/cm Measurement unit: mm (in) Draft surface at density ρ Water (draft surface when the density is 1.0 g (0.002 lb)/cm...

  • Page 53: Handling The Gauge In Water Leak/Airtightness Tests And At Gauge Startup

    Float level gauge LT5 Commissioning Handling the gauge in water leak/airtightness tests and at gauge startup When accidents such as damage to a measuring tape occur in a high-pressure tank such as a liquefied gas tank, not only do they have a grave impact on the operation of the tank, but repair work can also be very costly.
  • Page 56 *71629416* 71629416 www.addresses.endress.com...

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Lt5-1Lt5-4Lt5-6

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