User Manual
Contents
1. 42 ali 56 Figure 11 Dimensions of S300X series Dust Monitor ATEX Sensor 200 230 Figure 12 Dimensions of S300X series Junction Box Bg SINTROL 7 OPERATION 7 1 Parameter setting The 5311 5313 Dust Monitor measures the dust flow rate by measuring the current induced in the probe by charged solid particles impacting or passing by the probe The S313X instrument has 4 20 mA output and two relay contact alarm outputs The S311X has two alarm relay outputs only The measured dust flow value is low pass filtered to remove the effect of short variations like spikes in the input signal with a user selectable time constant then changed to a milliampere output which follows the filtered value with a scale set by the AUTOMATIC SETUP procedure The user may trim the milliampere output of the 4 20 mA signal The relay output s change their state when the measured dust flow rate value exceeds a user selected alarm trig level The relay output s are also protected against the effect of short variations in the input signal with a user selectable time constant damping parameter 5 common for both relays All the user selectable parameters have factory setup values which in many cases will suffice If your application requires changing of the parameters proceed as follows 7 2 How to change parameter values Open the c2. negative terminal active output 314 S315X Slot 9 RS 485 output terminal Slot 10 RS 485 output terminal Slot 11 RS 485 input terminal Slot 12 RS 485 input terminal X5 Output connector y Figure 7 Output connector in main electronics Bg SINTROL 4 WIRING OF JUNCTION BOX JUNCTION BUX AND MAIN ELECTRONICS C D 4 SIGNAL N JAINS UTPUT a TL P WER 1265 d P PAIR SHIELD DRAIN WIRES To Zener barrier ORANGE lower connector p BROW ML ale ZENER 1 Hie fete ZENER 2 fp V 2 JF v BLACK p E Ex AREA E sensor unit Figure 8 Wiring layout of Junction Box NOTE The output signal cable shield is allowed to ground only in junction box en
3. INTRINSICALLY SAFE 311X AND 313 Ex Series DUST MONITORS User Manual Version 1 3 08 09 2009 Bg SINTROL Table of Contents 1 INTRODUCTION Mise 4 1 1 SES M 4 1 2 Product NENNE Peer 4 1 3 HOW does TV ea 5 2 INSTALLATION 6 2 1 Selection of installation location 6 2 2 Installation of THE sensor 7 2 3 Installation of the junction box and signal processing unit 9 2 4 Installation of cable between sensor and junction 10 3 WIRING OF POWER AND OUTPUT CIRCUITS 12 3 1 Power connectors X3 sos n ii ei 12 42 O tp tconnector X5 13 4 WIRING OF JUNCTION BOX eeeeeeeeeee etes eese ense enata sena snae 14 5 TECHNICAL SPECIFICATION hu 16 6 DIMENSIONS i a ic iti ga it d ba 18 7 OPERATION 19 7 1 Parameter seng 19 7 2 How to change parameter 19 73 Relay 1 trig value and relay 2 trig 21 7 4 4mA trim and 20 MA UM 21 7 5 filter time constant and mA output time constant 21 70 OE NNN 22 7 7 The manual range 23 7 8 Us
4. If any parameter value is different from the values which you have saved when you return from changing parameters the value will remain in effect until next power down The saved parameter values will then be in effect after power supply is connected again PARAMETER CHANGE TABLE PARAMETER DISPLAY RANGE KEY EFFECT KEY EFFECT FACTORY LEFT NUMBER KEY KEY C DEFAULT ipu 1 1 99 add 10 add 1 5 2 1 99 add 10 add 1 60 4 mA trim 3 iet current current 311X set to 20 mA 20 mA trim 4 Relay filter 5 10 180 add 166 0 time constant 5 0 Current filter 6 10 300 add 105 Not in use model time constant S S311X Manual range 7 0 25 Next range Previous range 0 oun 8 SP save all save all Table 1 PARAMETER CHANGE TABLE FOR S311X model Bg SINTROL DISPLAY ANGE KEY EFFECT KEY EFFECT FACTORY PARAMETER RANG LEFT NUMBER KEY KEY C DEFAULT 1 1 99 10 add 1 5 ae ii 2 1 99 add 10 add 1 60 4 mA trim 3 increase decrease set to 4 mA current current 20 mA trim 4 increase decrease set to 20 mA current current Relay filter 5 10 180 add 108 0 time constant S Current filter 6 10 300 add 105s 0 time constant S SE 2 7 10 50 increase 10 decrease 10 20 Manual range 8 0 5 Next range Previous range 0 9 SP save all save all T
5. The S300X Series sensor must be mounted to metal ductwork in order to be electrically shielded from interference and to provide a ground reference The monitor should not be mounted in direct sunlight or in areas where the ambient temperature is above 45 oC If you need temperature range higher than 45 oC you should use 24VDC model Please contact your local distributor or Sintrol if you require further advice Figure 1 300 Series Intrinsically Safe Dust Monitor recommended installation location Bg SINTROL The sensor rod should be positioned pointing towards the centre line of the pipe or duct and perpendicular to the flow For ducts of square cross section the sensor should be located in the centre of one of the sides In either case the tip of the sensor rod should reach at least 1 3 of the diameter Depending on the dust concentration the probe length could vary from 1 3 to 2 3 of the duct diameter The lower the dust concentration the longer the probe When monitoring a dust collection system good location is generally found upstream of the blower assuming a negative pressure system When the monitor is used to control system with an electrostatic precipitator ESP the distance from the ESP should be at least 20 m Although the sensor lengths under 1m is immune to the effects of vibration very high vibrations should be
6. avoided 2 2 Installation of the sensor Once the location has been selected the mounting fitting socket must be welded to the pipe or duct The first step is to cut a hole in the pipe duct slightly larger than the OD of the mounting fitting mounting fitting outer diameter 38 mm The fitting should be perpendicular to the flow The weld and fitting must be airtight After welding the monitor can be inserted EARTH CONNECTIONS Make sure that the case of the sensor is connected to the local ground with a wire at least 1 5 square millimetres thick between the earthing screw outside the case and the closest place where good ground is present for instance the metal duct Use earth connector that goes round the earthing screw to avoid earth wire to slip off WARNING THE SENSOR ENCLOSURE IS MADE OF LIGHT METAL ALLOY Take care that you do not hammer the case or drop tools on the case and that there does not exist danger of things to hit the case after installation because this can cause danger of explosion Make sure that the warning label which is attached on the case is clearly visible after installation is complete Bg SINTROL NOTE Diameter of the hole in the duct must be minimum 38 mm P Figure 2 Sensor installation Sensor probe Lock nut Cable 2 pairs to junction box and main electronics Cover Enclosure Duct wall Mo
7. 10uH Ci 1nF RECOMMENDED DEVICE STAHL INTRINSPAK 9002 77 093 300 001 Type star configuration dual channel Rmax 82 1 ohm Un 6 0 V Uo 9 3V lo 150 mA channel 300 mA both channels Po 0 35 mW channel 0 7 mW both channels Lo 1 3 mH channel 0 2 mH both channels Co 4 1 uF channel 4 1 uF both channels This device may only be connected to appliances where no voltage higher than AC 250 V can occur Figure 15 Two dual channel STAHL INTRINSPAK 9002 77 093 300 001 Zener barriers in junction box Bg SINTROL SPECIFICATION OF CABLE BETWEEN SENSOR UNIT AND JUNCTION BOX Use cable that fulfills below specification or equivalent Manufacturer of below cable is Belden Inc http owcecom belden com PART NUMBER 8162 Paired Low Capacitance Computer Cables for EIA R232 422 DESCRIPTION 24 AWG stranded 7x32 tinned copper conductors twisted pairs individually shielded with 100 Beldfoil amp 24 AWG stranded tinned copper drain wire Datalene insulation overall Beldfoil shield plus 65 tinned copper braid shield PVC jacket CONDUCTOR Number of Pairs 2 Total Number of Conductors 4 AWG 24 Stranding 7x32 Conductor Material INSULATION Insulation Material Trade Name Insulation Material TC Tinned Copper Datalene FPE Foam Polyethylene PAIR Pair Lay Length 1 in Pair Twists ft 12 Pair Shield Material Trade Beldfoil Name Pair Shield Type Tape Pair Shield Material Aluminum Foil P
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9. TOMATIC SETUP on the lower printed circuit board e red green AUTOMATIC SETUP indicator led on the lower printed circuit board e three digit display e three control keys The S311X S313X Ex dust monitors have two independent alarm relay outputs and mA output latter only in S313X Relays may be triggered by either average or instantaneous levels The alarms are arranged such that Alarm 1 is a high alarm i e on increased flow and Alarm 2 is a low alarm i e on decreased flow The average alarms may be used to effectively provide an alarm delay facility preventing alarms on short term deviations from the normal conditions The alarms are fully programmable and may be set to Normally Open or Normally Closed Figure 14 User interface of main electronics in the junction box Bg SINTROL ZENER BARRIER REQUIRED PARAMETERS Channels 4 4 one channel devices 2 two channel devices or 1 four channel device Type BIPOLAR STAR CONFIGURATION Rmax 100 ohm PROPERTIES OF THE SENSOR ELECTRONICS All voltages in the sensor are between 2 75 V and 2 75 V nominal All currents in the sensor are less than 10 mA nominal The sensor tolerates 10 V or less zener barrier channel to channel voltage The sensor tolerates 100 ohm or less zener barrier series resistance per channel The sensor tolerates 150 mA or less current limit per channel THE MAXIMUM INPUT VALUES OF THE TWO INTRINSICALLY SAFE CIRCUITS ARE Ui 10V li 150mA Li
10. able 2 PARAMETER CHANGE TABLE for S313X model 7 3 Relay 1 trig value and relay 2 trig value Parameter 1 and 2 Set the trig levels in percent of the output full scale value which is determined by AUTOMATIC SETUP You may only increase the trig value by pressing the keys The percentage is displayed by the two rightmost display digits 7 4 4mA trim and 20 mA trim Parameter 3 and 4 Increase or decrease the output current The display shows the nominal mA value with its two rightmost digits Connect a calibrated mA meter to the milliamp output to check the actual current value Allow 30 minutes warm up time before trimming the mA output 7 5 Relay filter time constant and mA output time constant Parameter 5 and 6 latter not in use in S311X model Change the time constant in increments of 10 seconds The relay filter time constant will change back to 10s from 180s the mA signal output time constant from 60s The two leftmost digits of the value are displayed by the two rightmost display digits For example three digit display shows digits 506 parameter 5 and relay damping is set to 60s three digit display shows digits 612 parameter 6 and mA damping is set to120s Bg SINTROL 7 6 Automatic setup To be able to detect variations in dust flow and to set alarm in case of excessive dust flow variation the dust monitor needs to know the typical dust flow in your application when your process operates normally The dus
11. d Use cable gland contact springs for grounding output signal cable shield to same potential with the junction box See picture 6 Bg SINTROL RANGE G BROWN ENER BARRIER 1 RED G l Aa ENER BARRIER 2 P From sensor equivalents Figure 9 Wiring of Zener barriers in junction box Figure 10 Sensor enclosure and connections SHIELD Pai PAIR SHIELD DRAIN WIRES Zener barrier connecvor Connect cable shield to case Connect grounding wire to here Bg SINTROL 5 TECHNICAL SPECIFICATION Measurement objects Particle size Measurement range Process Conditions Temperature Pressure Gas velocity Humidity Input surge protection Measurement principle Damping time constant Output signals Ambient conditions Temperature Humidity Vibration Materials Probe Insulation of sensor Enclosure Power Supply External fuse requirement Power consumption Wiring connections Weight Monitor warm up time Range setup options Normal measuring range Extended measuring range Relay alarm options Alarm level Of
12. e mains disconnector Customer has to arrange mains disconnector to the power line to be able to shut it off if required The electrical installation must be carried out following all applicable regulations Unless the process conditions are known to be entirely safe suitable precautions must be taken before any entry is made into the duct for installation or maintenance purposes 1 2 Product overview The 311 and S313X intrinsically safe dust monitors are microprocessor based self adjusting devices equipped either with two alarm relays or one relay and 4 20 mA signal output Sensor is designed for explosive environments fulfilling Atex certificate requirements Il GD EEx ia T6 IP65 T 85 C It is a measurement system with the Eex sensor junction box Bg SINTROL and signal processing unit measuring instrument that has been specifically designed for easy installation and operation The sensor is intended to measure the dust particle density in gas which is flowing in the duct The EEx type sensor unit consists of a probe and a preamplifier and is intended to be used with various SINTROL DUST MONITOR 300 Ex series measuring instruments Using of zener barrier devices between the preamplifier and main electronics is necessary Any commercially available zener barrier devices with specifications fulfilling the requirements stated in the user manual may be used The probe is a steel rod which is inserted in a duct or pi
13. er interface 24 ZENER BARRIER REQUIRED 25 Bg SINTROL 1 INTRODUCTION This manual refers to SINTROL s Triboelectric Dust Monitors Sintrol welcomes any comments or suggestions relating to this document This manual is intended as a guide to the use and installation of the product Sintrol shall not be liable for any loss or damage whatsoever arising from use of any information or details therein or omission or error in this manual or any misuse of the product 1 1 Safety This equipment operates from either 115 VAC 50 60 Hz or 230 VAC 50 60 Hz or 24 VDC In either case the voltages employed must at all times be treated as lethal and suitable precautions taken whenever carrying out any form of installation or maintenance particularly when the cover of the unit is removed 5300 Ex Series dust monitors are virtually maintenance free The customer under no circumstances should attempt to replace any component or the PC board If there is a fault in monitor contact your local distributor or the manufacturer It is essential that the equipment be properly grounded See section 3 It is possible that the sensor is installed in duct containing particulate which is hazardous to health The particulate may be inflammable or explosive Particulate could be toxic or contained in a high temperature gas Connection to the power supply is fixed installation with no separat
14. fset trim Solid particles in a gas flow 0 3 um or larger 0 1 mg m to 1 kg m 100 C standard 200 350 C option Max 2 bar Min 4 m s 95 96 RH or less non condensing Under 20 kA pulses limited to 90 V Electrostatic charge detection 10 to 180 seconds isolated 4 20 mA N A in S301 relay 5A 24 V ACor DC 20 to 45 9596 RH non condensing 5 m s or less SS316L PEEK Aluminium 115 VAC or 230 VAC or 24 VDC two 200 mA slow T fuses 8 W for AC models 3 W for 24VDC model External mains connector DIN rail connector for output signals PG11 EMC type cable glands for signals Sensor 2 0 kg Junction box 3 5 kg 15 minutes automatic based on average measured dust flow manual range setup not in model S315X two alternative methods automatic set at factory based on average measured dust flow set with operating terminal automatic Bg SINTROL FULFILLS FOLLOWING ATEX REQUIREMENTS GN NG ET 2 Exia IC T6 IL 1 2 D Ex tD A20 A21 T 85 C DF on IP 65 Li 10 uH Ci 1nF U 10V 150mA Compliance with the Essential Health and Safety Requirements has been assured by compliance with the standards EN 60079 0 2006 EN 60079 11 2007 EN 60079 26 2007 EN 61241 1 2004 EN 61010 1 2001 LVD IEC 61326 1 2005 First Edition EMC Bg SINTROL 6 DIMENSIONS 30
15. le shield and uninsulated drain wires of the signal cable Connector X2 is for the four external connections Connect the other ends to zener barrier hazardous area side which is marked blue Use two dual channel zener barrier devices see zener specification at the end of manual Connect the signal and the signal reference wires to one zener barrier and the sensor supply voltages to the other zener barrier Connect uninsulated drain wires to the ground of zener barriers Bg SINTROL Make sure that you do not lay the wiring so that distance between bare metal in the safe side and the hazardous side may become less than 50 millimeters Cable gland installation for the cable between the sensor and the junction box Figure 5a Strip cable l e Expose braided shield Figure 5b Feed cable through dome nut and clamping insert Fold braided should over clamping insert Make sure braided shield overlaps O ring Figure 5c Push clamping insert into body in tighten dome nut Bg SINTROL 3 WIRING OF POWER AND OUTPUT CIRCUITS 3 1 Power connectors X3 Voltage 230 VAC 20 V or 115VAC 10V or 24 VDC Frequency 45 Hz 65 Hz for 230V and 110V models Power cable 3x1 5 mm External fuses Two 200 mA slow T fuses All power supply wiring inside the junction box is pre wired at the factory Power is fed to the junction box and to the main electronics via mains power cable Check the type label to co
16. nfirm that the power supply type is correct Connect AC or DC power supply wires to the first and third pin of the external connector Polarity is free The middle pin of the connector is for the earth wire but the earth wire is not required O 5 minn Figure 6 power connector X3 NOTE Protect both power supply wires with an external 200 mA slow T fuse Note When using 24 VDC transformer please note that AC2 in connector is for positive voltage input and AC1 for negative voltage input Bg SINTROL 3 2 Output connector X5 The junction box contains zener barrier devices for the sensor signal A two pair cable is connected between the sensor and the zener barrier blue end connector screws as described in section 2 4 Note The output signal functionality depends on the dust monitor model Slot 1 Relay1 normally closed NC terminal Slot 2 Relay1 common C terminal Slot 3 Relay1 normally open NO terminal ALL MODELS Slot 4 Relay2 normally closed NC terminal Slot 5 Relay2 common C terminal Slot 6 Relay2 normally open NO terminal Slot 7 4 20 mA positive terminal active output 312 S313X Slot 8 4 20 mA
17. olyester Tape Pair Shield Coverage 100 96 PAIR SHIELD DRAIN WIRE Pair Shield Drain Wire AWG 24 Pair Shield Drain Wire 7x32 Stranding Pair Shield Drain Wire Conductor Material PAIR COLOR CODE CHART TC Tinned Copper Number Color 1 Black amp Red 2 Black amp White OUTER SHIELD Outer Shield Material Trade Name Beldfoil amp Z Fold amp Outer Shield Type Tape Braid Layer Number Material Trade Name Type Material Coverage 96 1 Beldfoil amp Tape Aluminum Foil Polyester Tape 100 2 Braid TC Tinned Copper 65 OUTER JACKET Outer Jacket Material PVC Polyvinyl Chloride MECHANICAL CHARASTERISTICS Operating Temperature Range Non UL Temperature Rating 40 C To 60 60 C UL AWM Style 2493 ELECTRICAL CHARASTERISTICS Nom Characteristic Impedance Nom Capacitance Conductor to Conductor 1 KHz Nom Cap Cond to Other Cond amp Shield 1 KHz Nominal Velocity of Propagation Nom Conductor DC Resistance 20 Deg C Ind Pair Nominal Shield DC Resistance 20 Deg C Nominal Outer Shield DC Resistance 20 Deg C Max Operating Voltage UL Max Recommended Current 1000 12 5 pF ft 22 pF ft 78 96 24 0 1000 ft 18 Q 1000 ft 4 3 Q 1000 ft 300 V RMS 1 8 Amps per conductor 25 Bg SINTROL NOTES Bg SINTROL Sintrol Oy Ruosilantie 15 FI 00390 Finland Tel 358 9 5617 360 Fax 358 9 5617 36
18. osed during automatic setup After an hour the setup is ready and the dust monitor is in normal operation If your environment is not electrically noisy you may check the indicator lamp It turns back to green when setup is ready Bg SINTROL 7 7 The manual range option The MR parameter is not in use as factory default but it can be activated by using other than 00 value by saving the change with command The MR setup is used if the process is not stabile and the automatic set up can not be made or if the auto setup 100 range is not big enough to monitor the dust concentration range in the process Parameter 7 S311X and parameter 8 S313X changes the manual range By pressing key B or C desired range can be selected Parameter value 0 means normal mode and auto setup is needed All fixed ranges values from 1 to 5 do not need auto setup on commissioning because range settings are set at factory Parameter Gain Mode Dust level Auto setup 8 Value all auto setup is 0 Dynamic Automatic concentrations needed to do Very high dust 1 1x fixed eonoenttanon NOT NEEDED High dust 2 10x fixed NEEDED 3 100x fixed Moderate dust NOT NEEDED concentration 4 1000x fixed Low dust NOT NEEDED concentration 5 10000x fixed Very low dusi NOT NEEDED concentration Bg SINTROL 7 8 User interface The user interface consists of the following e key button for AU
19. over of the junction box You see the front panel display unit and three parameter change button A B and C NORMAL OPERATION TUNING IN PROGRESS AUTOMATIC SETL Parameter change buttons A B and C e TOO fi Figure 13 5300 Ex series Dust Monitor front panel in junction box Bg SINTROL Press the leftmost key A of the three keys below the display until the leftmost digit indicates the number of the parameter you wish to change 1 8 See Table 1 The two other display digits now show the parameter value Pushing the middle key B and rightmost key key C you may now change the parameter value see instructions below for each individual parameter When you have selected all the parameters push the leftmost A key again until the leftmost display digit shows number 8 and two other digits shows Push one of the other keys B or C to save all the parameters NOTE All parameters must be as you wish to have them when you save them If you want to make more changes or decide not to save the parameters you have changed push the leftmost A key again
20. pe The dust particles flowing in the duct which are electrically charged induce a charge in the sensor rod when passing by the rod 1 3 How does it work The S300 Ex Series Dust Monitors utilise the proven and reliable triboelectric technology whereby the interaction of particles with the sensor rod causes a small electrical charge transfer to occur between the particulate and sensor It is this small charge which provides the signal which is monitored by the electronics Provided that the material type remains constant the signal generated is proportional to the mass flow rate of solid particles even if an accumulation of dust forms on the sensor Experience has shown that this method of solids flow monitoring will provide accurate results with minimal maintenance Bg SINTROL 2 INSTALLATION 2 1 Selection of installation location The best position to install the 5300 Series sensor is a section of duct or pipe where the particulate has an even distribution and the flow is linear This is to ensure that the sensor rod comes into contact with a representative flow of particles This would ideally be in a vertical or horizontal section of duct pipe having no bends valves dampers or other obstructions for at least three duct diameters downstream and upstream preferable 5 x duct diameter In some applications a compromise must be made and the sensor would be fitted in a position which satisfies the majority of above requirements
21. t monitor has an AUTOMATIC SETUP function With this you set the measuring range of the dust monitor such that typical dust flow in your application corresponds to 20 of the dust monitor output full scale The 4 20 mA output at the typical dust flow rate will then be 4 mA 20 of 16 mA 20 4 mA which makes 7 2 mA If the dust flow rate 1 5 times the typical value or higher the output will be 20 mA and if the dust flow rate is zero the output will be 4 mA Parameter 7 Only in model S313X If you want to change the default percent of full Range factory default value is 20 for some reason it is possible to change it in steps of 10 from 10 to 50 see Table 2 For AUTOMATIC SETUP you need to know that the process is running with a normal dust flow rate Then open the cover of the dust monitor and initiate AUTOMATIC SETUP by pressing the small white key button near the indicator lamp on the lower printed circuit board see Figure 13 NOTE the indicator lamp should be green before you press the key The dust monitor starts collecting data of the dust flow This takes an hour or less The three digit display counts down towards zero and the indicator lamp is red as long as the data are being collected To avoid interference from the background electrical noise you should close the cover of the junction box enclosure right after having initiated the AUTOMATIC SETUP Cover of the sensor enclosure located in Ex area must be cl
22. tion box is not allowed to ground locally to avoid ground current loop The junction box and the main electronics are connected to ground potential with the cable shield through the sensor case Bg SINTROL EEx AREA SAFE AREA VITE SENSOR AND JUNCTION BOX AND PREAMPLIFIER MAIN ELECTRONICS pia o VA mA relay mains A tj OUTPUT POWER Z m N 7 i di V 2 pairs signal sensor voltage cable 100 200 p DO NOT ground junction y box locally The grounding of Z Figure 4 Sensor and Junction box QO the junction box is done with the signal cable shield and drain wires 2 4 Installation of cable between sensor and junction box Use shielded twisted pairs individually shielded two pair cable between the junction box and the explosion proof sensor Use crimped bootlace ferrules on wire ends to prevent loose strands of wire Wire ends without ferrules are a potential explosion hazard and are not approved to be used with the explosion proof sensor Maximum tested cable length between the junction box and the explosion proof sensor is 100 m In good interference free conditions 200 m Connect outer shield of both cable ends as is shown in figure 5a 5b and 5c Connect only sensor enclosure to ground potential to avoid ground current loop Do not connect junction box to local ground potential The grounding of junction box is made with the cab
23. unting fitting socket Weld Grounding wire DO RO M E ME TUE om Sensor printed circuit board connections Connector X1 position cable pair shield drain wire Connector X1 position2 cable pair shield drain wire Connector X2 position 1 Vou signal output Connector X2 position 2 ms signal reference output internally connected to gro nd Connector X2 position 3 V l supply voltage 2 5V nominal Connector X2 position 4 V gt supply voltage2 2 5V nominal 3 4 Bg SINTROL Figure 3 Connecting sensor wires 2 3 Installation of the junction box and signal processing unit JUNCTION BOX Connect the sensor only to a junction box which has zener barrier devices to separate the sensor from main electronics The junction box is not allowed to install in potentially explosive atmosphere A junction box is available from Sintrol Requirements for the junction box EMC regulations require use of the metallic junction box Cable connections and separation between the safe side and the non safe side EEx must be performed according to the requirements of European standard EN 60079 11 if installed inside European Union area or local standard which corresponds to standard EN 60079 11 Use EEx type gland for the cable between the junction box and the explosion proof sensor Cable gland has contact springs inside to connecting cable shield to enclosure ground potential The junc
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