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® LTU2000 Series and Tuning Fork Sensors ® ® Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Models. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Models and Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 LTUP and LTUR Status Guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 LTUM Status Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Trouble Shooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 03 Introduction LTU-2000 Series: Point Level Switch Omega's LTU-2000 Series use a piezo-electric crystal that enables the switch to vibrate at a fixed pre-defined resonant frequency. When the tuning fork is submerged in the medium the frequency at which the switch is vibrating, changes. This change is detected by the unit’s electronics and is converted into a switch output (either relay or PNP/NPN depending on the model). The red LED in the housing stays blinking when the LTU-2000 is in contact with the product. The same light stays on continuously when there is no contact with the product, giving a positive indication at all times that the LTU-2000 is working. All models are made with 316 Stainless Steel and are available with ECTFE or epoxy coatings and hygienic fittings for sanitary applications. Standard versions can operate at temperatures up to 80ºC (176ºF) and higher temperature versions can operate at temperatures up to 120ºC (248ºF). All models (except the mini-versions) have adjustable time delay adjustment of 1, 5, 10 or 20 seconds and also have a Wet/Dry selection for both High and Low level application requirements. Features Unaffected by variations in density, conductivity, dielectric constant or viscosity Unaffected by foam, tank agitation or vibration Available in Threaded, Sanitary and Flanged connections Available with customized length options to best suit your application All 316SS body and wetted parts, ECTFE coating when necessary Adjustable response time (from 1 to 20 seconds) Relay and Transistor outputs available 04 ® Models LTUM1-DC LTUP-DC NYLON HOUSING ® LTUM2-AC ® LTUM1-DC LTUR NYLON HOUSING LTUM2-AC LTUR ALUMINUM HOUSING LTUR ALUMINUM HOUSING 05 Models and Dimensions Mounting Options for LTU-2000 Nylon LTUM Aluminum 89mm 80mm 76mm 126mm 89mm ø38mm 118mm 130mm 28mm 48mm 56mm Aluminum 130mm Extended Necks for High Temperature MT 50mm 100mm HT Extended necks for medium temperature (up to 100ºC) and high temperature (up to 120ºC) Insertion Length TC Standard LTUM Extended Length L 80mm TC Standard LTU 64mm 80mm Standard Process Connections Threaded Connections 3/4” BSP NPT 1” 1 ½” 2” 1 ½” 2 ½” 2” 3” 1,75 Tri-Clamp Connection TC Connection Rubber Seal Process Connection Flange Connections 1” 1 ½” FF 2” RF ANSI 150# ANSI 300# 2 ½” 06 ® Wiring Diagram LTUP - Housing Time Delay Guide Time Delay 1 - Power Supply (+) 2 - Power Supply (-) 3 - PNP/NPN Output or +24v/0v (Max 500mA) 4 - Ground Central LED Wet/Dry 1 5 10 20 ON ONONONON 1 2 1 2 1 2 12 12 Power Supply WET DRY Mode 3 4 WET DRY O + 1 _2 UT LTUP - with M12 Connector 1 - Power Supply (+) 2 - Power Supply (-) 3 - PNP/NPN Output or +24v/0v (Max 500mA) 4 - Ground 20 … 60 V dc ( IL ) 500 mA Máx LTUR - Universal Power Supply Nylon Housing Time Delay Guide Central LED 1 - Power Supply (L) } AC ( ) 2 - Power Supply (-) } DC ( ) 3 - Power Supply (+) 4 - NC Contact 5 - Common 6- NO Contact Time Delay Power Supply 1 5 10 Relay Contact 5A - 220Vac 20 ON 1 2 1 2 LTUR - with M12 Connector 4 3 L - + WET DRY 5 6 NC C NO 1&2 (85... 264Vac (50/60Hz)) 2&3 (18...36Vdc) 1 - Power Supply (L) or (+) 2 - Power Supply (-) 3 - NO Contact 4 - NC Contact 5 - Common Power Supply AC: 85... 264Vac (50/60Hz) (I) < 10mA DC: 18...36Vdc (I) < 6mA Time Delay Guide 5 ON 1 ON 1 2 1 2 10 ON 1 2 20 ON 1 The different key positions indicate the time delay in seconds. 2 ( 1 ; 5 ; 10 ; 20 sec. ) 07 Wiring Diagram LTUR - Universal Power Supply Small Aluminum Housing 1 - Power Supply (L) } AC ( ) 2 - Power Supply (-) 3 - Power Supply (+) } DC ( ) 4 - NC Contact 5 - Common 6 - NO Contact Central LED ® 2 3 1 5 6 4 Wet Dry L - + LTUR - with M12 connector 1 & 2 (85...260 Vac) 2 & 3 (18...36 Vdc) 1 - Power Supply (L) or (+) 2 - Power Supply (-) 3 - NO Contact 4 - NC Contact 5 - Common LTUR S E C ON 1 2 5 1 20 10 Time Delay Guide Time Delay LTUR - Universal Power Supply Large Aluminum Housing Time Delay Output Logic Inversion 1 - Power Supply (L) } AC ( ) 2 - Power Supply ( -) } DC ( ) 3 - Power Supply (+) 4 - NO Contact 5 - NO Common 6 - NC Contact 7 - NC Common ® LTUR ON A B S1 1 2 D E L A Y S E C 1 5 Supply: AC: 85...260V DC: 18...24V 1 2 10 20 Wet Dry 3 L - + AC DC 4 5 NO 6 7 Time Delay Guide NC Central LED 08 ® Wiring Diagram ! To avoid burning the unit, make sure that the load has been installed in series with the LTUM before powering it up. LTUM1 DIN 43650 M12 3 2 2 3 1 4 3 0V 2 1 LTUM 1 NO +V LTUM 2 1 4 NC 0V Out +V Out 3 5 ® ® LTUM2 DIN 43650 M12 3 2 2 3 1 4 NC L1 N 2 1 4 NO 3 5 1 L1 3 N 2 1 09 ® LTUP and LTUR Status Guide For LTUP / DC Switch Position Out Level Central LED WET (Blink) WET Probe Covered Maximum fail-safe DRY (On) Probe Uncovered WET (Blink) DRY Probe Covered Minimum fail-safe DRY (On) Probe Uncovered For LTUR (Universal Power Supply) Level NO - NC 4 Central LED 5 WET (Blink) Probe Covered 5 6 4 5 DRY (On) Probe Uncovered 5 6 10 LTUM Status Guide LTUM1 / DC ( Operating Mode NC ) Connector Pins 3 2 1 4 external load (+) (-) LTUM1 / DC ( Operating Mode NO ) (GND) Connector Pins 2 3 1 4 external load (+) (-) LTUM2 / AC ( Operating Mode NC ) (GND) Connector Pins 3 1 4 external load L1 LTUM2 / AC ( Operating Mode NO ) N (GND) Connector Pins 2 1 4 external load L1 N (GND) 11 ® Installation Confirm that the wire connections are correct and that the available power supply is compatible with the LTU unit. (Fig.1) Verify that the operating pressure and temperature of the process corresponds to the operating parameters of the LTU unit. The LTU can be installed at any angle of the pipe or vessel to detect the presence of liquids. Verify that the forks are inserted into the medium until the proper point within the vessel and that they stay clear from the inside walls (Fig. 1 and 2). Ensure that the conduit is facing downward and makes a U-turn on the bottom of the cable to avoid moisture from entering the housing enclosure (Fig.3). (Fig.2) For proper installation of the LTU use the mark as a reference for correctly positioning the forks. It is recommended that the correct orientation be used to avoid build up between the forks (Fig. 4). Switching hysteresis 1mm Switching point=1/2” (13mm) Side View (Fig.4) (Fig.3) Top View Switching hysteresis 1mm Switching point=1/2” (12mm) 12 Handling Fig. 1 Seal the thread with Teflon tape before installation (Fig. 1). Do not thread the unit into the vessel, or turn it, by the housing (Fig. 2). Fig. 2 Use the correct tools during the installation of the LTU (Fig. 3). The LTU should not be dropped or suffer any impact or fall that could damage the electronics, coating or the forks of the probe (Fig. 4 and 5). Periodic visual inspection of the LTU is required to check for corrosion or deposit build-up. If deposits are found, clean the sensor to ensure optimum performance. Fig. 3 Fig. 4 When cleaning the Forks use a soft brush to ensure that the coating or polishing is not damaged or scratched. Fig. 5 Do not alter or bend the shape of the forks ( Fig. 6). Fig. 6 13 ® Technical Specifications LTUP 1 5 10 20 ON ONONONON 1 2 12 12 12 12 WET DRY Mode O UT + 1 _2 3 4 WET DRY 18 … 60 V dc ( IL ) 500 mA Máx Nylon Enclosure Application Operating Voltage Current Consumption Level Switch for Liquids 20...60 Vdc +/- 3mA Output PNP (3 wires) Medium Viscosity Max.: 20.000cs Accuracy Repeatability Time Delay Switching Point Load Current Enclosure Material Electrical Connection Process Connection Wetted Material Operating Temperature Max Pressure Class Protection 0.1% < 0.5mm 1 to 20 seconds (adjustable) 13mm from tip 500mA Glass Filled Nylon ½” NPT, M12 Connector or Cable Gland 3/4” to 1 ½” BSP, NPT or Sanitary 316 Stainless Steel -14 to 176º F (-10 to 80ºC) 725 PSI (50 Bar) IP 65 14 ® Technical Specifications LTUR ® 1 5 10 20 ONONONON ON ON A ® 12 12 12 12 1 1 2 2 3 4 5 6 B S1 Wet 1 2 4 3 WET DRY 5 NO C NC L - + 1 & 2 (85...260 Vac) 2 & 3 (18...36 Vdc) VTK-G1 Nylon Enclosure 1 Dry S E C ON 1 2 1 2 D E L A Y S E C 1 5 Supply: AC: 85...260V DC: 18...24V 6 1 5 10 2 3 L - + AC DC 20 Aluminum Enclosure 10 5 4 6 NO Level Switch for Liquids Operating Voltage 18...36 Vdc 85...264 Vac (50/60Hz) Output Medium Viscosity Accuracy Repeatability Time Delay Switching Point Load Current Relay 7 NC Aluminum Enclosure Application Current Consumption 20 Wet Dry DC < 6mA AC < 10mA Relay (SPDT) N1, G1 / (1NO+1NC) G2 Max.: 20.000cs 0.1% < 0.5mm 1 to 20 seconds (adjustable) 13mm from tip 5A ( 250 Vac) Enclosure Material Glass Filled Nylon or Aluminum Electrical Connection ½” NPT, M12 Connector or Cable Gland Process Connection Wetted Material Operating Temperature Max Pressure Class Protection 3/4” to 1 ½” BSP, NPT or Sanitary 316 Stainless Steel -14 to 176º F (-10 to 80ºC) 725 PSI (50 Bar) IP 65 15 ® Technical Specifications LTUM1 ® LTUM1-DC LTUM1 Application Operating Voltage Current Consumption Output Medium Viscosity Accuracy Repeatability Time Delay Switching Point Load Current Enclosure Material Electrical Connection Process Connection Wetted Material Operating Temperature Max Pressure Class Protection Level Switch forLliquids 20...60 Vdc +/- 3mA PNP (3 Wires) Max.: 20.000cs 0.1% < 0.5mm 1 sec. 13mm from tip 500mA 316 Stainless Steel Plug DIN 43650 / M12 Connector 3/4” to 1 ½” BSP, NPT or Sanitary 316 Stainless Steel -14 to 248º F (-10 to 120ºC) 725 PSI (50 Bar) IP 65 DIN 43650 connector IP 67 M12 connector 16 Technical Specifications LTUM2 ® LTUM2-AC LTUM2 Application Operating Voltage Current Consumption Output Medium Viscosity Accuracy Repeatability Time Delay Switching Point Load Current Enclosure Material Electrical Connection Process Connection Wetted Material Operating Temperature Max Pressure Class Protection Level Switch for Liquids 85...264 Vac +/- 3mA Direct Load Switching (2 Wire) Max.: 20.000cs 0.1% < 0.5mm 1 sec. 13mm from tip 100mA 316 Stainless Steel Plug DIN 43650 / M12 Connector 3/4” to 1 ½” BSP, NPT or Sanitary 316 Stainless Steel -14 to 248º F (-10 to 120ºC) 725 PSI (50 Bar) IP 65 DIN 43650 connector IP 67 M12 connector 17 ® Trouble Shooting Fault Does not switch Incorrect switching Case The central LED is not on Solution Verify the Power Supply The LED flashes 3 times/sec. Internal failure The LED flashes once every 2 seconds Internal failure The LED flashes once every 4 seconds High current load or short circuit. Check the installation. The Fork is encrusted with build-up Clean the forks Dry = on Wet = on Properly configure the key switch Fast switching Select a longer time delay 18 M-3991/0215