LFT level sensor - the all-round talent with TDR technology

Transcription

1 level sensor - the all-round talent with TDR technology the impulse is reflected there and runs along the probe back to the electronics, which then calculates the fill level from the time difference between the impulse sent out and the received on. The sensor can output this as continual measurement value (analogue output) as well as derive a freely positionable switching point [S] from it (switching output). D ATA SH E E T TDR sensor Measuring range 3...,99 LLatest technology: TDR sensor with coaxial probe for continual fill Area of use Innovative TDR technology enables inexpensive, reliable fill level measurements largely independent of applications. The LFT is suitable both for continual fill level measure- level measurements with analogue ments and for limit-level detection in almost all fluids; changes in the and switching output, e.g., as alternative for capacitive sensors. properties of fluids to be measured do not influence it. It is the solution Measurement principle for precise and reliable measurements, especially in small tanks The LFT uses the TDR technology (TDR = Time Domain Reflectometry) a process for determining installation conditions. Typical appli- and containers independent of run times of electromagnetic cations are, for example, in: waves. A low-energy, electromagnetic impulse is generated in the Coolant lubricants Oil electronics of the sensor, coupled Other fuel types into the coaxial probe and run in the inside of this probe. When this impulse reaches the fluid on the surface to be measured, part of

2 Dimensional drawing Mx 6... G 3/ A 3/ NPT 6 IA S L 6 3 < Ø IA M M: Measuring range S: Switching point L: Probe length IA: Inactive area Dimensions () Installation The sensor is installed vertically from above into the container or tub using its connection thread screw. For example, it can be screwed in directly into a weldin socket or a mounting bracket. Minimum bracket diameter and maximal bracket height do not apply here. Install the sensor, so that it does not touch other tank installations (e.g., feed pipes or other measurement equipment), the container wall or the container bottom (the use of the supplied gasket with a height of might be sufficient here). Minimum distances do not apply here. Select the installation spot, so that the sensor is not exposed directly to filling. The sensor should not be installed in a calm area of the container, in which sediment could settle over time (e.g., sanding dust). Continual rinsing of the sensor via moving fluid is recoended. Operation The sensor can be configured completely via the button. Visual feedback via the LEDs help here. You can make the following settings directly on the sensor: Set and delete the switching point [S ] for the switching output and via Teach-in Switch between opener and closer for the switching output Set the measurement range Switch between voltage and current outputs for the analogue output Reset the sensor to the ex works state Please read the operating instructions for a detailed explanation of operation Approvals No special, application-related approvals are currently required for the sensor. Connection type L+ NC Q A Q A Q L+ 6 Q NC 7 M M 3 Q 3 3 Q Q Pin Male connector -pin Wire colour cable Male connector -pin Wire colour cable terminal box terminal box +U V (... 3 V DC) brown (brn) Analogue output Q A white (wht) Analogue output Q A white (wht) +U V (... 3 V DC) brown (brn) 3 V blue (blu) Switching output Q3 green (grn) Switching output Q black (blk) Switching output Q yellow (yel) not connect Switching output Q gray (gra) 6 Switching output Q pink (pnk) 7 V blue (blu) not connect SICK --

3 Technical data Electric data Output functions Analogue output Namur and/or switching output PNP ) Analogue output burden by < Ω Lower signal level ma Upper signal level.... ma Operating time ms Switching output Signal voltage HIGH V S V Signal voltage LOW V V Output current I A < ma Output load Capacitive load nf Inductive load H Operating time ms Supply voltage V 3) s... 3 V DC Residual ripple V SS Current consumption ) < 9 ma at V DC Protection class Initialization time < s Connection types Plug M, -pin Plug M, -pin Measurement performance ) Accuracy ± 3 Reproducibility < Resolution < Hysteresis Switching output 3 or free adjustable Temperature drift. /K Measuring range [M] 3...,99 (at probe length, ) Inactive area 6) Each Application conditions Dielectricity constant [ε r ] 7). ) Conductivity 7) No restrictions Temperature 9)... + C Ambient temperature 9) Operation C Storage... + C Container pressure bar rel. (during fi lling and emptying processes) Separating layer (e.g., oil on water) ) > 7 Mechanical data Enclosure rating IP 67 Connection thread screw G 3/ A; 3/ NPT; Probe length [L]..., Material Housing PBT Probe 36L/. Seal/probe end./.3/ptfe ) Freely positionable in the complete measurement range ) Switching output short-circuit protected 3) Connections reverse-polarity protected ) Without load ) Reference condition: Dielectricity constant [ε r ] = (water) with changed ε r, measurement performance and the inactive range change 6) At top and bottom plus tolerances of measurement accuracy 7) Fluid to be measured ) Suitable for all oils, e.g., cutting, grinding and hydraulic oils, coolant lubricants, erosion dielectrics, cleaning and degreasing agents, all fluid lubricants, water and water-based fluids 9) We recoend using a distance sleeve with simultaneous max. medium temperature and max. ambient temperature (see accessories). ) The sensor does not detect an oil layer of < 7 on water, i.e., the sensor detects the water level. Starting from an oil layer of > 7, the complete fill level is detected, i.e., the level incl. the oil layer. -- SICK 3

4 code Optional LFT Probe length in (worth x ) From To Connection thread screw tank G 3/ A 3/ NPT Connection housing Mx, -pin (max. switching output possible) A (min. switching outputs) B Analogue output Measurement value output (only with switching outputs) Current output Switching output Opener A Closer B Switching outputs/switching points (number) Switching output, hysteresis locked, 3 Switching outputs, hysteresis locked, 3 Switching outputs, hysteresis locked, 3 Switching output, hysteresis adjustable Switching outputs, hysteresis adjustable 6 Optional: Device type Customized factory settings W Customized factory settings ) Switching point hysteresis locked, (3 ) Position switching point [S] (-) Switching point, hysteresis adjustable Position of upper switching thresholds [S] (-) Position of lower switching thresholds [S] (-) Analogue current output Upper value [ ma] Order information You can obtain the sensor pre-confi gured for your requirements by selecting the appropriate options in the order code. Default setting: Measurement range [M] has the maximum extension between the inactive areas at the top and bottom (each ). The lower signal level of the analogue output ( ma) is at the lower probe end, the upper signal level ( ma) at the upper probe end. Lower value [ ma] ) The sealing surface of the screw-in thread of the probe is the reference point for customer-specific setting (see dimensional drawing) SICK --

5 Order information * Output: current output () and switching output/hysteresis: 3 LFT-AA LFT3-AA LFT-AA LFT-AA LFT6-AA LFT7-AA LFT-AA LFT9-AA LFT-AA LFT-AA LFT-AA LFT3-AA LFT-AA LFT-AA LFT6-AA LFT7-AA LFT-AA LFT9-AA LFT-AA Probe length Connection thread screw tank Connection plug housing Mx, -pin Mx, -pin Mx, -pin Mx, -pin Mx, -pin Mx, -pin Mx, -pin Mx, -pin Mx, -pin Mx, -pin Mx, -pin Mx, -pin Mx, -pin Mx, -pin Mx, -pin Mx, -pin Mx, -pin Mx, -pin Mx, -pin Current output Switching output Opener Output: switching output/hysteresis: 3 LFT-BA LFT3-BA LFT-BA LFT-BA LFT6-BA LFT7-BA LFT-BA LFT9-BA LFT-BA LFT-BA LFT-BA LFT3-BA LFT-BA LFT-BA LFT6-BA LFT7-BA LFT-BA LFT9-BA LFT-BA Probe length Connection thread screw tank Connection plug housing Current output Switching output Opener * Other models. -- SICK

6 Dimensional drawings and order information* Output: current output () and switching outputs/hysteresis: 3 Probe length Connection thread screw tank Connection plug housing Current output Switching output Opener LFT-BA 363 LFT3-BA LFT-BA 3633 LFT-BA 363 LFT6-BA LFT7-BA LFT-BA 3637 LFT9-BA LFT-BA 3639 LFT-BA 36 LFT-BA 36 LFT3-BA 36 3 LFT-BA 363 LFT-BA 36 LFT6-BA 36 6 LFT7-BA LFT-BA 367 LFT9-BA 36 9 LFT-BA 369 * Other models. Cables and connectors SENSICK srew system M, -pin, enclosure rating IP 67 Female connector M, -pin, straight Female connector M, -pin, angled x,, sheath PVC x,, sheath PVC DOL--GM DOL--GM DOL--GM m m m DOL--WMA DOL--WMA DOL--WMA R min ) 3.3. /wht 3/blu 3/blu /blk m m m. Mx ) Minimum bend radius in dynamic use R min = x cable diameter /brn /gra /blk 6... /wht /brn /gra Mx R min ) 6 SICK --

7 Dimensional drawings and order information Connecting systems SENSICK screw-in system M, -pin, enclosure rating IP 67 Female connector M, -pin, straight Female connector M, -pin, angled x,, sheath PVC x,, sheath PVC DOL--GM 6633 m DOL--WMA 699 m DOL--GM 6993 m DOL--WMA 633 m DOL--GM 6 m. Mx. 3 R min ) /gra /yel 3/grn /brn 6/pnk 7/blu /wht R min ) Mx Female connector M, - or -pin, straight Female connector M, - or -pin, angled x, or x,, sheath PUR halogenfree x, or x,, sheath PUR halogenfree DOL--GMC 696 m DOL--WMC 699 m DOL--GMC 697 m DOL--WMC 69 m DOL--GMC 69 m DOL--WMC 69 m DOL--GMC 636 m DOL--WMC 6363 m DOL--GMC 636 m DOL--WMC 636 m DOL--GMC 636 m DOL-WMC 636 m 3. R min ) 3.. Mx 7. R min ). ) Minimum bend radius in dynamic use R min = x cable diameter Mx Power supply,... V AC/ V DC, A, IP Power supply 779 Counter-nut Distance sleeve Price Price 3, G, PA 3, G, stainless steel 3, NPT, PA 3, G, plastic 3, NPT, stainless steel 3, NPT, plastic -- SICK 7

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