lips ? m100 cylinder - linear position sensor intrinsically safe for hazardous mining environments for further information please contact: www.positek.com sales@positek.com tel: +44(0)1242 820027 fax: +44(0)1242 820615 positek ltd, andoversford industrial estate, cheltenham gl54 4lb u.k. as a leading designer and manufacturer of linear, rotary, tilt and intrinsically safe position sensors , positek ? has the expertise to supply a sensor to suit a wide variety of applications. our intrinsically safe m100 lips ? (linear inductive position sensor) is atex approved for use in potentially explosive gas/vapour, dust atmospheres and mining environments. it is designed for demanding hydraulic or pneumatic cylinder position feedback applications where service life, environmental resistance and cost are important and is ideal for oems seeking good sensor performance for arduous applications in hazardous areas. overall performance, repeatability and stability are outstanding over a wide temperature range. the unit is highly compact and space - efficient, being responsive along almost its entire length. like all positek sensors, the m100 provides a linear output proportional to displacement. each unit is supplied with the output calibrated to the travel required by the customer, from 20 to 600mm and with full emc protection built in. the sensor is very rugged, being made of stainless steel with an inert fluoropolymer - sheathed probe with the option of either an aluminium or stainless steel target tube. the sensor is easy to install in cylinders and has a range of mechanical options. environmental sealing is to ip67. intrinsically safe for mining to: i/ii m1/1gd non - contacting inductive technology to eliminate wear travel set to customer?s requirement high durability and reliability high accuracy and stability sealing to ip67 specification dimensions body diameter 35 mm body length (to seal face) 43 mm probe length (from seal face) measurement length + 58 mm target tube length measurement length + 30mm id 7.7mm, od 9.45mm for full mechanical details see drawing m100 - 11 independent linearity < 0.25% up to 450mm @ 20c < 0.5% over 450mm @ 20c temperature coefficients < 0.01%/c gain & < 0.01%fs/c offset typical overall accuracy < 0.75%/ fso frequency response > 10 khz ( - 3db) resolution infinite noise < 0.02% fso intrinsic safety i/ii m1/1gd eex ia i/iic t4 (ta = - 40c to +80c) ex iad 20 t135c (ta = - 40c to +80c) maximum limits ui: 11.4v, ii: 0.46a, pi: 0.51w. environmental temperature limits operating - 40 to +80c storage - 40 to +125c sealing ip67 hydraulic pressure 350bar emc performance en 61000 - 6 - 2, en 61000 - 6 - 3 vibration iec 68 - 2 - 6: 10g shock iec 68 - 2 - 29: 40 g mtbf 350,000 hrs 40c gf drawing list m100 - 11 sensor outline p100 - 12 typical target installation details p100 - 15 mounting thread details tg24 - 11 optional target tube flange details drawings, in autocad ? dwg or dxf format, available on request. do you need a position sensor made to order to suit a particular installation requirement or specification? we?ll be happy to modify any of our designs to suit your needs - please contact us with your requirements.
lips ? m100 cylinder - linear position sensor intrinsically safe for hazardous mining environments for further information please contact: www.positek.com sales@positek.com tel: +44(0)1242 820027 fax: +44(0)1242 820615 positek ltd, andoversford industrial estate, cheltenham gl54 4lb u.k. table of options measurement range: factory - set to any length from 20 to 600 mm in increments of 1mm. electrical interface options a galvanic isolation barrier is required to meet is approval - 0.5 - 9.5v or 4 - 20ma options, see barrier data sheet overleaf. connector/cable options connector - binder 713 series ip67 cable with pg9 gland ip67 cable length >50cm ? please specify length in cm up to 15000cm maximum. we recommend all customers refer to the 3 & 5 - wire connection information. mounting thread options m18, m20, ? unf 30mm hex af, ?30mm seal face. supplied with o - ring seal. flange options penny & giles hlp100, temposonics (m4 fixing) and parker hannifin cylinders versions available. intrinsically safe equipment is defined as ?equipment which is incapable of releasing sufficient electrical or thermal energy under normal or abnormal conditions to cause ignition of a specific hazardous atmosphere mixture in its most easily ignited concentration.? atex approved to i/ii m1/1gd eex ia iic t4 ex iad 20 t135c (ta = - 40c to +80c) designates the sensor as belonging to; groups i and ii: suitable for all areas (including mining) , category m1/1 gd: can be used in areas with continuous, long or frequent periods of exposure to hazardous gas (zones 2 to 0) and dust (zone 20), equipment remains energised. gas: protection class ia, denotes intrinsically safe for all zones apparatus group iic: suitable for iia, iib and iic explosive gases. temperature class t4: maximum sensor surface temperature under fault conditions 135c. dust: t135c: maximum sensor surface temperature under fault conditions 135c. ambient temperature range extended to - 40c to +80c. positek intrinsically safe sensors are designed to be used with a galvanically isolated barrier with safety parameters not exceeding: - ui: 11.4v, ii: 0.46a, pi: 0.51w. sensor can be installed with a cable length up to 150m maximum from the barrier, capacitance and inductance can be up to: - capacitance: 550 nf max, inductance: 99 h max. for cable lengths exceeding 10 metres a five wire connection is recommended to eliminate errors introduced by cable resistance and associated temperature coefficients. approved barriers are available from positek ? ; there is a choice of 0.5 - 9.5v or 4 - 20ma transmission outputs. 0.5 - 9.5v barrier option - bx002. 4 - 20ma barrier option - bx003. atex approved sensors suitable for gas (x series) and dust (e series) applications, are also available from positek. output characteristic - standard 0 10 20 30 40 50 retracted linear displacement extended m i n o u t p u t m a x output characteristic - reverse option 0 10 20 30 40 50 retracted linear displacement extended m i n o u t p u t m a x
for further information please contact: www.positek.com sales@positek.com tel: +44(0)1242 820027 fax: +44(0)1242 820615 positek ltd, andoversford industrial estate, cheltenham gl54 4lb u.k. intrinsic safety means limiting the electrical energy in a system to a level incapable of causing ignition in any normal or fault condition. this can only be accomplished by installing an energy - limiting interface in the wiring between hazardous and non - hazardous areas. limiting the discharge of energy - stored devices in electrical equipment such as capacitors and inductors virtually eliminates the possibility of generating a spark and thus a source of ignition. the bx002 (0.5 to 9.5v) and bx003 (4 to 20ma) isolated galvanic barriers are the best choice for use with positek intrinsically safe position sensors. the hazardous area circuits are certified intrinsically safe [eex ia] iic. connections between hazardous and non - hazardous areas are transformer isolated, eliminating the requirement for a high - integrity intrinsically safe earth. choosing either a bx002 or bx003 barrier not only provides signal isolation but allows sensors to be calibrated to a specific barrier type before shipping, ensuring the respective barrier output corresponds to the sensor position over the calibrated range. the isolated power circuit limits the energy supply to the sensor to ensure the maximum safety parameters required for positek sensors are not exceeded. atex approved tri - port isolated din rail mounted voltage and current output versions specification power supply power rail terminals 11 and 12 voltage 20 - 35v dc power consumption ca. 0.7w for voltage output, 1.4w current output input circuit (terminals 1,2,3,4,5) transformer isolated intrinsically safe [eex ia] iic bas00atex7171 umax out = 10.4v imax out = 46ma voltage across sensor ca. 4.8 volts lead resistance for 15ma 12 maximum (all connections) input resistance terminal 3 17m min output circuit (terminals 7/8) output options voltage bx002 0.5 to 9.5v output resistance < 30 current loop bx003 4 to 20ma load resistance 0 - 1k transfer characteristics non - linearity: < 5mv for voltage outputs < 10 a for current outputs temperature drift: < 0.5mv/c for voltage outputs < 1a/c for current outputs settling time to 1% of span: < 25ms for 10 - 90% step change rise time: < 8ms 10 - 90% of step change bandwidth dc to 100hz ( - 3db) isolation: 2500v between safe area terminals and hazardous area terminals, 50v between power rail terminals and output terminals (7 and 8) electromagnetic compatibility emissions: to en50081 - 2 immunity: to en50082 - 2 ambient temperature range: - 20 to 60c working, - 40c to +100c storage protection class ip20 how it works; a 20 - 35v dc external power supply is connected to the dc/dc converter d1 which provides isolation. the output from d1 is regulated by a1 and tr1 to provide a nominal 5v supply for the sensor. the barrier and sensor can be connected by three wires; 5 - wire connection capability is available to compensate for volts drop in long cable runs. d2 provides isolation between the sensors output and the barriers 0.5 - 9.5v or 4 - 20ma current loop output. intrinsically safe bx002 and bx003 sensor barrier
intrinsically safe bx002 and bx003 sensor barrier 3 & 5 - wire connection information the following discussion about 3 and 5 wire connections between sensors and the galvanic isolation amplifiers is intended as an aid for end - users who are not familiar with the topic. whether opting for a pre - wired positek ? intrinsically safe sensor or one with a connector, choosing the right mode of connection and cable to suit the application requires consideration. conductor resistance, a function of cross - section, length and current, causes volts drop across cable. this can significantly alter the perceived accuracy of the sensor which is ratiometric i.e. the output signal is directly affected by the supply voltage at the sensor. 3 - wire connections are common for connecting sensors but accuracy can become an issue. increasing conductor cross - section reduces volts drop and is suitable for all but very long lengths or applications that require a high degree of accuracy. another factor to consider is conductor temperature. fluctuations in temperature also cause minor changes in resistance, the effects of which can be seen in the calculated examples below for 0.25mm 2 and 2.5mm 2 conductors at 20c and 50c. sensors supplied with cable are calibrated with the cable fitted which negates errors due to conductor resistance at room temperature; however, small errors due to temperature fluctuations should be expected. large cross - section cables are not always practical. for example, sensors supplied with either the ip65 or ip67 connectors have a maximum conductor size of 0.75mm 2 . 5 - wire connections have significant benefits over three wire connections as losses in the power and ground conductors are compensated. the galvanic isolation amplifier senses and dynamically adjusts the output voltage so that the voltage at the sensor is correct, the effects of cable resistance and associated temperature coefficients are eliminated. bx002 and bx003 amplifiers can compensate for up to 12 ? per conductor with a current flow of 15ma, which is more than adequate for 150m of 0.25mm 2 cable. for this reason positek ? recommends five wire connections for cable lengths exceeding 10 metres . see illustrations right for examples of connecting a sensor to the galvanic isolation amplifier. the following formulae can be used to calculate losses due to conductor cross - section and conductor temperature; resistance of the a single conductor is r = x l / a x (1 + tc x (t - t amb )) where: = resistivity of copper wire: 1.69 x 10 - 8 ? m l = length of the wire: in metres a = area of the conductor cross section of the wire in metres 2 : e.g. 0.25mm 2 conductor 0.25/1000 2 = 2.5 x 10 - 7 m 2 tc = copper temperature coefficient: 3.9 x 10 - 3 t = conductor temperature in c t amb = ambient temperature i.e. 20c voltage at sensor v sensor = v - i x 2 x r where v = supply voltage from the amplifier i = the supply current: 10ma r = resistance of the a single conductor examples: (of 3 - wire connections with the maximum 150 metres of cable, conductor sizes 0.25 2 and 2.5mm 2 at 20c and 50c) 0.25mm 2 cable at 20c r=1.69x10 - 8 x150/2.5x10 - 7 x(1+3.9x10 - 3 x(20 - 20)) = 10.14 ? v sensor =5 ? 10x10 - 3 x2x10.14 = 4.79v or 4.0% loss 0.25mm 2 cable at 50c r=1.69x10 - 8 x150/2.5x10 - 7 x(1+3.9x10 - 3 x(50 - 20)) = 11.33 ? v sensor =5 ? 10x10 - 3 x2x11.33 = 4.77v or 4.5% loss 2.5mm 2 cable at 20c r=1.69x10 - 8 x150/2.5x10 - 6 x(1+3.9x10 - 3 x(20 - 20)) = 1.01 ? v sensor =5 ? 10x10 - 3 x2x1.01 = 4.98v or 0.4% loss 2.5mm 2 cable at 50c r=1.69x10 - 8 x150/2.5x10 - 6 x(1+3.9x10 - 3 x(50 - 20)) = 1.13 ? v sensor =5 ? 10x10 - 3 x2x1.13 = 4.97v or 0.45% loss +v o/p 0v +v o/p 0v +sense i/p -sense +v +sense i/p -sense 0v +v 0v 3-wire connections 5-wire sensor sensor amplifier 0.75mm2 max. 3-wire +v o/p 0v +v o/p 0v +sense i/p -sense +v +sense i/p -sense 0v +v 0v connections terminals terminals 5-wire sensor sensor amplifier for further information please contact: www.positek.com sales@positek.com tel: +44(0)1242 820027 fax: +44(0)1242 820615 positek ltd, andoversford industrial estate, cheltenham gl54 4lb u.k.
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