Table of Contents
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Table of Contents
Related Manuals for IFM LT80 Series
Summary of Contents for IFM LT80 Series
- Page 1 Operating instructions Electronic level and temperature sensor LT80xx...
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Page 2: Table Of Contents
Contents 1 Preliminary note ....................4 1.1 Symbols used ....................4 2 Safety instructions ....................5 3 Functions and features ..................6 3.1 Application area ....................6 3.2 Restriction of the application area ..............6 4 Getting started .....................6 4.1 Example configuration 1 ................7 4.2 Example configuration 2 ................8 5 Function .......................9 5.1 Measuring principle level ................9 5.2 Measuring principle temperature ..............10... - Page 3 10 Parameter setting ....................24 10.1 Parameter setting in general ..............24 10.2 Basic settings ...................25 10.2.1 Assign process values to the outputs [SEL3] / [SEL4] ......25 10.2.2 Assign process value to the display [SELd] ........25 10.2.3 Define unit of measurement for level [uni.L] ........26 10.2.4 Set the unit of measurement for the temperature [uni.T] ....26 10.2.5 Set the offset [OFS] ................26 10.2.6 Set the medium [MEdI] ..............26...
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Page 4: Preliminary Note
13.5.2 Definition "from the bottom“ ..............36 14 Maintenance / cleaning / change of medium ..........37 14.1 Maintenance information for operation without overflow prevention ..37 15 Factory setting ....................38 16 Applications......................39 16.1 Storage tank ....................39 16.2 Pumping station ..................40 1 Preliminary note 1.1 Symbols used ►... -
Page 5: Safety Instructions
2 Safety instructions • The device described is a subcomponent for integration into a system. - The manufacturer of the system is responsible for the safety of the system. - The system manufacturer undertakes to perform a risk assessment and to create a documentation in accordance with legal and normative requirements to be provided to the operator and user of the system. -
Page 6: Functions And Features
3 Functions and features 3.1 Application area The unit was especially designed to meet the requirements of machine tool building. It is especially suitable for monitoring coolant emulsions (also dirty) as well as cutting and hydraulic oils. The unit monitors 2 process values: level and temperature. 3.2 Restriction of the application area •... -
Page 7: Example Configuration 1
4.1 Example configuration 1 Unit LT8022 (probe length L= 264 mm) Medium to be detected Mineral oil Operating mode Manual media selection with overflow prevention (Factory setting → 5.3.1 Installation environment Metal tank, installation to Fig. 4-1 Fig. 4-1 ► Install unit. ►... -
Page 8: Example Configuration 2
4.2 Example configuration 2 Unit LT8023 (probe length L= 472 mm) Medium to be detected Coolant emulsion Operating mode Automatic medium detection (→ 5.3.1) Installation environment Metal tank, installation to Fig. 4-2. ► Install unit. Fig. 4-2 ► Observe the distances (x), (u) and (c): min. -
Page 9: Function
5 Function 5.1 Measuring principle level The sensor determines the level according to the capacitive measuring principle: • An electrical field [E] is generated Fig. 5-1 and influenced by the medium to be detected. This change to the field causes a measurement signal that is electronically evaluated. -
Page 10: Measuring Principle Temperature
5.2 Measuring principle temperature The temperature is detected by a Pt element at the lower end of the probe and electronically evaluated. • Media without water content (e.g. oils) are directly (in contact with the medium) detected. • Hydrous media can also be directly detected up to temperatures of 35 °C. For temperatures >... -
Page 11: Operating Modes
5.3.1 Operating modes 1. Manual media selection with overflow prevention (factory setting) Recommended. Highest operational reliability. The medium to be detected is set manually [MEdI]. In addition, an integrated, independently functioning overflow prevention is available. 2. Manual media selection without overflow prevention Medium operational reliability. -
Page 12: Notes On The Integrated Overflow Prevention
5.3.2 Notes on the integrated overflow prevention With the parameter [OP] (OP = overflow prevention), one of the upper measuring segments is defined as integrated overflow prevention. • If the overflow prevention OP is activated, an adjustment to the installation situation has to be made [cOP]. - Page 13 The unit signals via four switching outputs that set limits have been exceeded or that the level is below the limit. • Outputs OUT1 / OUT2 are assigned to the process value level. • Outputs OUT3 / OUT4 are freely programmable: Parameter [SEL3] / [SEL4] assigns the process value, level / temperature, to the outputs OUT3 / OUT4 (→...
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Page 14: Offset For Indicating The Real Level In The Tank
The IODDs necessary for the configuration of the unit, detailed information about process data structure, diagnostic information, parameter addresses and the necessary information about the required IO-Link hardware and software can be found at www.ifm.com. -
Page 15: Mounting
6 Mounting CAUTION! The surface of the unit may get hot if the switching outputs are operated at maximum load. > Risk of burns ► Do not touch the unit ► Protect the housing against contact with flammable substances and unintentional contact. Fig. -
Page 16: Notes On Installation Instructions For Operation With Overflow Prevention
6.1 Notes on installation instructions for operation with overflow prevention [MEdI] = [CLW..] or [OIL..]; [OP] = [value ...] (overflow prevention OP activated) It is permitted to fix the mounting elements within the mounting zone (M) (Fig. 6-1). ► Observe the maximum permitted outside length (c) according to Table 6-1. ►... -
Page 17: Installation Instructions For Operation Without Overflow Prevention
6.2 Installation instructions for operation without overflow prevention [MEdI] = [Auto] or [OP] = [OFF] (overflow prevention OP deactivated) 6.2.1 Installation in the inactive zone Between the maximum level (b1) and the inactive zone (I1), minimum distance (a1) must be adhered to (see Fig. 6-2 and Table 6-3). ►... -
Page 18: Installation In The Active Zone Of The Probe
6.2.2 Installation in the active zone of the probe The minimum distance (a2) must be observed between the maximum level (b2) and the mounting element (a2) (Fig. 6.3 and Table 6-4). ► Fix mounting elements in the mounting Fig. 6-3 zone (M) (fig. -
Page 19: Other Installation Notes
In case of automatic medium detection [MEdI] = [Auto] or deactivated overflow prevention [OP] = [OFF], the sensor reinitialises itself each time it is switched on and makes adjustments to the medium and the installation environment. The active zone / measuring range must not be completely covered by the medium. -
Page 20: Electrical Connection
OUT1: / IO-Link OUT2: Switching output (level) OUT3: Switching output (level / temperature) OUT4: Switching output (level / temperature) Colours to ifm Example circuits 4 x positive switching 4 x negative switching 4: OUT1 4: OUT1 2: OUT2... - Page 21 For safe function, the sensor housing must be electrically connected to the counter-electrode (grounding). ► Use the housing connection (see drawing) and a short piece of cable with a wire cross section of min. 1.5 mm When using metal tanks, the tank wall serves as the machine earth.
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Page 22: Operating And Display Elements
8 Operating and display elements 3 4 5 6 Mode/Enter 1 to 8: Indicator LEDs LED 1 Indication in cm LED 2 Indication in inches LED 3 Indication in °C LED 4 Indication in °F LED 5 Switching status OUT4 (lights when output 4 is switched) LED 6 Switching status OUT3 (lights when output 3 is switched) LED 7... -
Page 23: Menu
9 Menu 9.1 Menu - - - - 10.0 10.0 Lo.T - - - - 20.0 - - - - Hi.T 19.5 FOU1 FOU2 FOU3 FOU4 MEdl OIL.2 TEMP SEL3 20.4 SEL4 TEMP donE uni.L LEVL SELd °C uni.T Menu items highlighted in grey, e.g. -
Page 24: Parameter Setting
10 Parameter setting CAUTION! The surface of the unit may get hot if the switching outputs are operated at maximum load. > Risk of burns ► Do not touch the unit ► Use another object (e.g. a ballpoint pen) to carry out settings on the unit. -
Page 25: Basic Settings
Timeout: If no button is pressed for 30 s during programming, the unit returns to the operating mode with unchanged values (exception: cOP). Locking / unlocking: The unit can be locked electronically to prevent unauthorised setting (factory setting: not locked). ►... -
Page 26: Define Unit Of Measurement For Level [Uni.l]
10.2.3 Define unit of measurement for level [uni.L] ► Enter [uni.L] before the limits for level are entered. This avoids unintentional maladjustments. ► Select [uni.L] ► Define unit of measurement for the level: uni.L [cm] = level in cm [inch] = level in inches 10.2.4 Set the unit of measurement for the temperature [uni.T] ►... -
Page 27: Set The Overflow Prevention [Op]
► In case of doubt, select [OIL.2] for oils. ► Test proper functioning in an application test. The settings [CLW.1] and [CLW.2] suppress deposits (e.g. metal swarf). The settings [OIL.1] and [OIL.2] suppress a bottom layer of higher dielectric water or swarf which is a few cm high. If no oil layer is present (or if it is very thin), the bottom layer is detected. -
Page 28: Adjust The Overflow Prevention [Cop]
10.2.8 Adjust the overflow prevention [cOP] Only adjust the overflow prevention OP when the unit is installed. If possible, carry out the adjustment when the tank is empty. The tank may be partly filled. ► Make sure that the overflow prevention OP is not covered by the medium. -
Page 29: Setting Of Output Signals
With deactivated overflow prevention [MEdI] = [Auto] or [OP] = [OFF] it is necessary for the unit for applying the basic settings and adaptation to the medium and installation environment: 1. to be installed in the application. 2. to be reinitialised. ►... -
Page 30: Define Switching Limits [Fhx] / [Flx] (Window Function)
10.3.3 Define switching limits [FHx] / [FLx] (window function) ► Make sure that for [oux] the function [Fno] or [Fnc] is set. ► Set [FHx] first, then [FLx]. ► Select [FHx] and set the upper limit of the acceptable range. ►... -
Page 31: Configure Display [Dis]
10.3.8 Configure display [diS] ► Select [diS] and set value: [On] = The display is switched on in the operating mode. Update of the measured values every 500 ms [OFF] = The display is switched off in the operating mode. When one of the buttons is pressed, the current measured value is displayed for 30 s. -
Page 32: Operation
12 Operation After switch-on of the operating voltage, the unit is in the operating mode (= normal operating mode). It carries out its measurement and evaluation functions and generates output signals according to the set parameters. ► Check whether the unit operates correctly. 12.1 Operating indicators [----] (continuous) Initialisation phase after power on. -
Page 33: Read / Reset Extreme Value Memory Temperature
12.3 Read / reset extreme value memory temperature ► Select parameter [Lo.T] or [Hi.T] ► Briefly press [Set] for reading. > Device displays the stored maximum or minimum value for 30 s. ► To delete the memory keep [Set] pressed until [----] is displayed. ►... -
Page 34: Output Response In Different Operating States
Overflow prevention OP adjusted or According to process value and setting [oux] deactivated, normal operation Fault According to setting [FOUx] 13 Technical data Technical data and scale drawing at www.ifm.com 13.1 Setting values [OFS] Table 12-1 [cm] [inch] Setting range 0...200.0... -
Page 35: Setting Ranges Switching Limits For Temperature
13.3 Setting ranges switching limits for temperature Table 12-3 [°C] [°F] [SPx] / [FHx] -19...90 -3...194 [rPx] / [FLx] -20...89.5 -4...193 Step increment 13.4 Setting values [OP] Table 12-4 LT8022 LT8023 LT8024 [cm] [inch] [cm] [inch] [cm] [inch] 20,4 40,7 16,0 23,9 19,1... -
Page 36: Calculation Aids [Op]
13.5 Calculation aids [OP] For proper functioning of the overflow prevention OP a minimum distance (y) (Fig. 12-1) must be observed (→ 6.1). The following applies (Fig. 12-1): B: tank height L: probe length B + c = L + u c: outside length (maximal (→... -
Page 37: Maintenance / Cleaning / Change Of Medium
14 Maintenance / cleaning / change of medium When removing or installing the unit for maintenance and cleaning work: ► Make sure that the stainless steel tube clip is fixed to the sensor. > It must be possible to exactly reproduce the installation height and position. ►... -
Page 38: Factory Setting
15 Factory setting Factory setting User setting LT8022 LT8023 LT8024 10.0 (cm) 19.5 (cm) 29 (cm) 9.5 (cm) 19.0 (cm) 28 (cm) 6.0 (cm) 10.0 (cm) 15 (cm) 5.5 (cm) 9.5 (cm) 14 (cm) 20.4 (cm) 40.7 (cm) 61 (cm) 65 (°C) 62 (°C) 70 (°C) -
Page 39: Applications
16 Applications 16.1 Storage tank Level control and min / max monitoring with 4 switching outputs (No temperature monitoring; [SEL3] and [SEL4] = [LEVL]) Replaces 4 float switches Configuration of the switching outputs 1...4 Maximum value exceeded → alarm. Hysteresis function, normally closed (Hnc). Upper preset value exceeded →... -
Page 40: Pumping Station
• If the level is below SP1, the output is switched. If the level is above SP1 or if there is a wire break, output 1 switches off (alarm message "overflow / wire break“). • If the level reaches SP2, output 2 switches (upper preset value reached; finish refilling). - Page 41 = 40 (°C) As long as the temperature is below SP4, the output switches. If the level is above SP4 or if there is a wire break, output 4 switches off (alarm message "overtemperature / wire break“). More information at www.ifm.com...
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