LTU 701. Technical Specification

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1 LTU 701 Technical Specification

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3 Table of Contents Table of Contents LTU 701 Submersible Level Sensor... 2 Product... 2 Features... 2 Technical features... 2 Approvals and standards... 2 Safety data, Ex...3 Dimensions...3 Materials... 3 Power supply...4 Mounting... 4 Standard configuration at delivery...4 Connection/Installation... 4 LTU 701 standard measuring ranges...5 Important notes on intrinsic safe design and lightning protection...6 Important notes on the physical properties of LTU LTU 701 Technical Specification 1

4 LTU 701 Submersible Level Sensor LTU 701 Submersible Level Sensor Product Features The Flygt Level Transmitting Unit, LTU 701 is a HART-programmable level sensor, intended for measuring a liquid level. LTU 701 is specifically engineered to withstand the harsh environmental conditions typically encountered by Flygt pumps: sewage, slurry and viscous liquids as well as sea water; the piezo resistive pressure sensor comes with a corrosion resistant Hastelloy C measuring diaphragm. The output is a standard 4 20 ma direct current, proportional to the measured level. Measuring ranges are pre-set at delivery, but may be adjusted with a HART modem and a dedicated PC program (e.g ). LTU 701 is well adapted to the prevalent control systems on the market including the Flygt controllers of the APP, FGC and ATU-ranges. It is approved for Ex-hazardous applications and is also fitted with overvoltage protection. It is recommended to fit an extra surge arrester (e.g ) in thunderstorm prone regions. High level of accuracy, repeatability and long-time stability Broad temperature operating range (-20 C 80 C) Resistance to grime and deposits Resistance to over-pressure (measuring range x 3) Wearability and high resistance to chemicals (ph 4 12) Technical features Power supply: Output signal: Temperature in medium: Inaccuracy, incl. non-linearity, hysteresis and repeatability: Long term instability: Thermal drift: 9 48 V DC, 2 wire system 4 20 ma (max 22.5 ma) -20 C 80 C 0.1% < 0.1% FS/ 6 months < 0.015% FS/ 10 C Fully programmable via HART modem Approvals and standards EMC directive 2004/108/EC: EN , EN EN Pressure Equipment Device (PED) directive 97/23/EG: ATEX 94/9/EC: APED1999/AFS1999:4 CENELEC EN EN (2007) CSA Std C22.2 No 0 10; No 142 M1987 (R 2004); No (R2006) 2 LTU 701 Technical Specification

5 LTU 701 Submersible Level Sensor UL Std (5th Ed); Std (5th Ed) NEMKO 07ATEX1118 Ex ia IIC T4 CL I, Div 1, Grps ABCD; Type 6P; T4, Ta:-20 to +80 C CL I, Zone 0: Ex ia IIC; IP68 AEx ia IIC Ui=28V; Ii=95mA; Pi=0,7W; Ci=48nF; Li=75uH Made in Sweden for Xylem Water Solutions AB by Pondus Instruments AB, Stockholm. MC # Safety data, Ex Maximum input voltage, U i : Maximum input current, I i : Maximum input power, P i : Maximum internal capacitance, C i : Maximum internal inductance L i : 28 V 95 ma 0.7 W 48 nf 75 uh WARNING: Only EX-approved products can be used in hazardous areas. The power supply must have a linear resistive output characteristic. The transmitter shall not be subjected to an explosive atmosphere with pressure exceeding 1.1 bar. Installations in EX-applications must be done in accordance with local rules and regulations. Personnel must know about the risks of electric current, and the chemical and physical characteristics of the gas or vapour present in hazardous areas. Intrincically safe circuits are required for the automatic control system. - Use a EX-safety barrier (e.g. Prod. no ). Dimensions Sensor dimensions Cable dimensions Line wire area Weight Ø 31 mm (largest measure) x 250 mm 0.50 mm kg kg/m Materials Wet side parts: Sensor body Acidproof, stainless steel, SIS2353 Ingress protection IP68 (120 m H 2 O) Measuring diaphragm Cable Hastelloy C Polyurethane, vented LTU 701 Technical Specification 3

6 LTU 701 Submersible Level Sensor Power supply Sensor main supply 9 48 V DC, two-wire system Mounting Submersible, hanging free from the cable with dedicated suspension attachment. Not positions dependent. Standard configuration at delivery Connection/Installation Connection Measuring range: 4 20 ma, according to part number Damping: 1 s Output function: linear Alarm: off Made for Xylem by Pondus Instruments, Sweden A Wiring 1 White + VE (9 48 V DC) 2 Brown - VE (0 V DC) 3 Copper wire (shield) P/E connection (ground) NOTICE: Polarization should not be reversed, though the sensor is fully protected against incorrect polarization. Parts A Membrane vent. Prevents moisture from entering reference pipe - DO NOT CUT OR REMOVE! Accessories Part Part number EX-barrier Junction box, including surge arrester and HART resistor HART modem, including USB connection with clips, 470 W resistor and PC software CD LTU 701 Technical Specification

7 LTU 701 Submersible Level Sensor Figure 1: Figure 2: Installation NOTICE: The sensors (part no , , , , and See table on next page) all have the same pressure sensor (range 0 20 m) and can be calibrated from 0 to 20 m, by means of a HART modem. Exception: The 0 3,5 m sensor (part no ) can only be calibrated within its range. LTU 701 standard measuring ranges Measure range, m H 2 O (bar) Max overload, m H 2 O (bar) Cable length, m Intrinsic safety Part no (0 0.35) 25 (2.5) II 1G LTU 701 Technical Specification 5

8 LTU 701 Submersible Level Sensor (0 0.50) 60 (6.0) II 1G (0 0.50) 60 (6.0) II 1G 0 10 (0 1.0) 60 (6.0) II 1G 0 20 (0 2.0) 60 (6.0) II 1G (0 0.50) 60 (6.0) (0 1.0) 60 (6.0) Important notes on intrinsic safe design and lightning protection Intrinsic safe design and lightning protection cannot be optimized simultaneously because: II 1G The Intrinsic safe design (Ex ia) requirement demands that the unit can withstand at least 500 V DC insulation test voltage between supply (+ or ) and ground, without short circuiting. Lightning protection, on the other hand must connect incoming surge voltage at the lowest possible level (above the max. supply 48V DC) to ground. For the above reasons, the two LTU 701-models with built in lightning protection (part no and ) are not EX-approved. Important notes on the physical properties of LTU 701 The piezo resistive sensor is connected to the measured media by means of a diaphragm. Pressure acting directly on the diaphragm is propagated to the sensor through a pressure intermediate oil, completely filling the volume between diaphragm and sensor. The Hastelloy C diaphragm is embossed to the surface underneath it during manufacturing, making it largely insensitive to particles and physical contact. The atmospheric pressure on the reverse side of the sensor (used for reference) is accessed through a capillary tube embedded in the probe cable. 6 LTU 701 Technical Specification

9 LTU 701 Submersible Level Sensor The diaphragm transportation protection cap can be safely removed, but it is advisable to leave it in place when sharp, protruding objects may be encountered in the pump well during operation. The cap is designed so that it should not interfere with measurements even in typically "greasy" applications, where clogging would normally be a concern. NOTICE: Caution! Low ph in media (a.k.a."free hydrogen (gas)") i.e. acidic conditions, ph<4, may affect the life span of LTU 701 adversely. If you are uncertain, please contact Xylem for advice. LTU 701 Technical Specification 7

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12 Xylem zīləm 1) The tissue in plants that brings water upward from the roots 2) A leading global water technology company We're 12,000 people unified in a common purpose: creating innovative solutions to meet our world's water needs. Developing new technologies that will improve the way water is used, conserved, and re-used in the future is central to our work. We move, treat, analyze, and return water to the environment, and we help people use water efficiently, in their homes, buildings, factories and farms. In more than 150 countries, we have strong, long-standing relationships with customers who know us for our powerful combination of leading product brands and applications expertise, backed by a legacy of innovation. For more information on how Xylem can help you, go to xyleminc.com Xylem Water Solutions AB Gesällvägen Sundbyberg Sweden Tel Fax Visit our Web site for the latest version of this document and more information The original instruction is in English. All non-english instructions are translations of the original instruction Xylem Inc _7.2_en.US_ _TS_LTU701