Arkon Channelmag User's Manual
Contents
1. Installation 2 4 5 PM2 Sensors in The ChannelMag PM Series sensors are used in partially filled pipes from 20 120 500 3000 Non Full Pipes mm diameter For pipes 20 36 500 915 mm a single ChannelMag sensor is installed in a retention band at the bottom of a horizontal pipe For larger pipes two sensors are used at the bottom of the pipe with their center lines equally dispersed at 15 degrees from the pipe center For partially filled pipes a hydrostatic level transducer is incorporated in a ramp on the upstream end of the sensor The level transducer cable includes a breather tube which is vented in the remote 441 le transmitter or in a junction box when the cable is longer than 33 feet 10 m The cables are run in plastic conduits to the pipe exterior Partially Filled Pipes Single Sensor 20 36 500 915 mm Diameters Partially Filled Pipes Double Sensors 38 120 920 3000 mm Diameters 16 ChannelMag Section 2 Installation 2 4 6 Installation of PM2 Sensors With Magnetic Enhancement Band Center spacer used for compound sensor installation only Outer mounting points used without center spacer Bands joined here 17 ChannelMag Section 2 Installation 2 4 7 ChannelMag PM2 Enhancement Plate Expander Mechanism The expander mechanism incorporates 2 left hand and right hand threaded rods which when turned with a wrench spanner secure the enhanc2. act pressure of the flowing media The hydrostatic pressure transducer may be installed with its bottom most end above any silt build up at the bottom of the channel by a suggested maximum of 0 5 10mm The FMX167 ha a sealed sensing diaphragm Similarly to the FMX167 the CM2 D mean velocity sensor may be installed to protrude above the bottom of the channel by a suggested maximum of 0 5 10mm as shown in the diagram below Suggested Protrusion to a avoid Residual Silt Build up 8 00 Weight 11 Ib 5kg 200mm Hydrostatic Level Transducer See separate drawing Put in still well Removeable Gel Supplied with CM2 D 6 00 150mm Min Clearance From Bottom of Channel Minimum Clearance The CM2 8 24 and 40 ChannelMag sensors are normally supplied with mounting brackets at each side The mounting brackets are placed over two clearance slots cut into the Magnetic Enhancement Plates Base plates with fixing screws countersunk from the bottom side are then used to secure the CM2 ChannelMag to the Magnetic Enhancement Plates The clearance slots allow the Magnetic Enhancements Plates to be adjusted symmetrically about the exact width of the channel The width must be adjusted and secured before installing the ChannelMag into the channel For CM2 ChannelMags supplied without ramps the CM2 must be placed in a recess that must be made in the bed of the channel The recess depth must be such that the upper su
3. annelMag sensor use the lifting brackets fixed to the sensor as shown on the drawing in Section 2 4 Use a min diameter 1 8 3mm steel rope looped through the bracket holes for installing the ChannelMag sensors s Use the holes in the magnetic enhancement plates ONLY for convenience of removing the sensors from flowing media since in so doing the enhancement plates may be damaged The ChannelMag is highly insensitive to environmental electrical noise including interference from radio and variable frequency drives However it is good practice to locate the ChannelMag and ancillary equipment away from the immediate area of such noisy environments The ancillary electronics must be located remotely from the ChannelMag sensors They must not be mounted under direct sunlight or where they are subject to driving rain where they cannot be reasonably read or serviced For such environments they must be protected by a suitable canopy or protective housing Avoid environments where moisture can accumulate in the electronics A heated enclosure may be necessary to achieve this The ChannelMag sensors are indefinitely submersible to 30 feet 10m 15 psig 1 bar g They are normally supplied with conduited cables and junction box see data sheet in this instruction manual for details of lengths Should the cables be extended then each cable may be spliced soldered and all cable joint surrounded with shrink sleeves Shielding must be extended to the sam
4. arkon wy systems CHANNELMAG FLOWMETERS FOR OPEN CHANNELS AND NON FULL PIPES RTM Expolink s r o Prikop 8 60200 Brno Czech Republic arkon bk t flow systems FOREWORD This instruction manual is designed to help you gain a thorough understanding of the operation of the equipment ARKON recommends that you read this manual completely before placing the equipment in service Although ARKON designs reliability into all equipment there is always the possibility of a malfunction occurring You can use this manual to help in diagnosing and repairing the malfunction if possible If the malfunction persists call or write the ARKON Customer Service Department for assistance Address and contact information RTM Expolink s r o Prikop 8 60200 Brno Czech Republic Tel 420 545 175 834 Tel Fax 420 545 175 684 Email office rtm expolink com Website www arkon co uk For other countries consult your nearest ARKON representative Simple difficulties can often be diagnosed over the phone If it is necessary to return the equipment to the factory for service please read our terms and conditions available on request or from our website ARKON welcomes suggestions that would improve the information presented in this manual or enhance the operation of the equipment itself IMPORTANT PLEASE READ DANGER The installation and operation of this product may put you at risk of serious injury or even death Take wha
5. ble Runs From the Junction Box Section 3 Calibration Data 3 1 Calibration and Range Factors Section 4 Maintenance 4 1 Cleaning 4 2 Zero Span Checking 4 3 Effect of Moisture Ingression 4 4 Effect of a Grounded Electrode 4 5 Effect of One CM2 of Two Inoperative 4 6 Transmitter Fault 4 7 All Checks Good But No Signal ND 22 Table of Contents 4 8 Erratic Signal 4 9 Signal or Indication Swing Section 5 Recommended Spares 5 1 Recommended Spares 24 24 25 ChannelMag Section 1 Introduction 1 1 Scope ChannelMag CM2 The ChannelMag CM2 is suitable for open channels having diverse cross sectional shapes from 6 to 200 feet 150 mm to 60 m They meet or exceed the requirements of ISO 9213 and are calibrated in a long open tank believed to be the largest NIST traceable facility available The ChannelMags are calibrated in accordance with ISO approved methods Each ChannelMag system is normally supplied with a NIST traceable Calibration Certificate Magnetic enhancement plates are fixed to and calibrated with ChannelMag sensor types CM2 8 40 The enhancement plates are purposely made to the required shape of the channel to widths or diameters from 10 to 15 feet 250 mm to 3 m Their purpose is to determine the distribution pattern of magnetic flux on calibration in ARKON test laboratory and to insure it is the same as the distribution on site In this way the test calibration is the same a
6. d representative To check if there is electrical ground at the electrodes the cable ends 24 and shield and 25 and shield respectively are removed from the terminals of the transmitter The resistances should approximately the same between each and between 100k Ohms to 5 M Ohms If any electrode is grounded the signal will be at approximately 34 of the normal signal Remove anything highly conductive between the appropriate electrode and ground If there are two ChannelMag sensors used as one flow system in a channel the electrodes and coils are wired in parallel Should one sensor coil become defective then the system will continue to operate but there will be a small inaccuracy due to operating with only one sensor If this is unacceptable a replacement sensor can be installed at a convenient time The erroneous sensor can be determined by checking as above in the junction box 23 ChannelMag Section 4 Maintenance 4 6 Transmitter Fault Should the resistances referenced above be correct but the zero and span cannot be achieved then the fault lies with the transmitter 4 7 All Checks Good Check wiring in transmitter terminals in accordance with the transmitter instructions Make sure But No Signal there is actually flow through the channel 4 8 Erratic Signal Check the following a Make sure the ChannelMag sensor is fully covered with media b Check Paragraphs 4 1 4 to 4 1 6 c Check if the ChannelMag sensor is correctly groun
7. ded see Section 2 5 d Check for loose wiring e Make sure cables are not too long For multiple ChannelMag systems make sure electrode cables are separated from other cables see Section 2 7 f The ChannelMag has high insensitivity to radios and variable frequency drives If these are in close proximity to the transmitter or sensor then cable lengths should be kept to an absolute minimum 4 9 Signal Or Indication Check the following Swing a Make sure there is enough straight length of channel see Section 2 3 If the requisite b c straight lengths are not available then the damping in the transmitter must be maximized see transmitter Instruction Manual Make sure there are no flow pipes or channels entering the channel in the location of the ChannelMag sensor Make sure there is no debris or loose cables in the vicinity of the electrodes 24 ChannelMag Section 5 Recommended Spares Since the ChannelMag sensor is a solid state sensor completely encapsulated there are no recommended spares 5 1 Recommended Spares Make sure when ordering a new ChannelMag sensor or transmitter that the serial number found on the transmitter label is advised When a new ChannelMag sensor is provided it has a new Calibration Certificate Make sure the new calibration factor is entered into the transmitter in accordance with the appropriate transmitter Instruction Manual 25
8. e length as all other cable cores Should a junction box be used to extend cables it must be absolutely dry then fi lled with potting compound We recommend 3M High Gel type 4442 two part re enterable compound mixed 50 50 The typical drying time is 2 3 hours but it never solidifies hard A metal shield 1 16 1 2mm thick must be placed between ChannelMag Section 2 Installation the electrode cables and the energizer coil cable within the junction box Do not use silicone rubber RTV for potting since it contains acetic acid which can corrode the junction box terminals Make sure the serial number of the ChannelMag sensor s shown on the cables agrees with the serial number of the transmitter This is particularly important when more than one ChannelMag flow system has been supplied If a sensor and transmitter have been supplied separately then the transmitter range factor has to be adjusted according to the sensor calibration see transmitter instructions Although the ChannelMag sensor is bi directional make sure the ChannelMag is installed in the channel with the flow direction arrow consistent with the actual flow direction of the media If it is not then the electrode cable terminals in the remote transmitter may be switched around see separate transmitter instruction manual The accuracy and flow calibration factor is identical in both directions 2 3 Straight Lengths of The CM2 ChannelMag must be insta
9. eld to 6 Shield to 26 Shield to 19 The junction box is submersible and is potted with a re enterable gel but is not intended to be installed in the media flowing in the channel Cables from dual sensors are wired in the junction box as shown below in Section 2 6 2 19 ChannelMag Section 2 Installation 2 6 1 ChannelMag Junction Box Wiring Diagram Huy HOSP Field Electrodes IPELE ERLT Nee G y th BLACK RED OR CLEAR SHIELD N CAUTION E ChannelMag Section 2 Installation 2 6 2 ChannelMag Entela Approval 2 7 Cable Runs From The Junction Box The cable ends and the junction box supplied for multi Channel Mag systems are to NEMA 6 and IP68 for permanent submersion to 30 feet 10m water column As such the cable ends are supplied with shrink fit sleeves It is important not to cut these sleeves off during storage as they prevent moisture permeating the cables ends Moisture in the cables causes signal instability Cut the sleeves off only prior to wiring into the transmitter Cables must be split not more than 1 25mm from the terminal entries of the transmitter Do not coil excess cable to avoid false inductance ChannelMags are Entela Approved For Class 1 Div 2 or European Zone 2 Areas ile For a single ChannelMag sensor or remote junction box for use with multiple ChannelMags sensors used in applications Entela approved to CSA and NEC standards for Class 1 Division 2 areas or t
10. ement plates and sensor assembly firmly in pipe Additional fixtures or holes in the pipe are unnecessary 2 4 8 ChannelMag PM2 Weights and Dimensions peg BS Pedy Fie 25 Grounding The CM2 ChannelMag is equipped with a grounding plate normally manufactured from AISI 316 stainless steel This makes sure there are no unequal potentials between the media and the shielding of the ChannelMag connection cables For cable distances from the junction box to the transmitter of 100 feet 30m further grounding requirements are not normally necessary However for longer cable lengths a pre amp in the junction box is necessary N CAUTION Total cable distances of greater than 300 feet 100m are not recommended since it increases the possibility of unequal potentials 18 ChannelMag Section 2 Installation 2 6 Cable Types ChannelMags are connected to a junction box normally using cables in flexible 1 25mm conduit See the ChannelMag Sensor Specification for the standard cable and conduit lengths The cables and conduit are stowed for packing against the side of the Magnetic Enhancement Plates and are marked coils electrodes and reference The cables from the junction box to the transmitter are without conduits and connected to the remote transmitter terminals as follows see separate instructions for the transmitter Electrodes Reference Coils Black to 4 Black to 24 Black to 31 White to 25 White to 32 Shi
11. g level x mean velocity The level signal is linearized in the 441le Level is measured normally by a high resolution pressure transducer which is used under the ramps of the ChannelMag velocity sensor This has the advantage of being supplied with the PM2 sensor as a single unit as well as being virtually insensitive to froth on the surface of the media However an ultrasonic level transducer is available which must be mounted in a suitable manhole 1 3 Safety ChannelMag Section 1 Introduction The following warnings are provided for your safety You should read the general note regarding danger preceding this introduction as well as these warnings when working with this equipment DANGER Crush hazard The flowmeters may be very heavy net weights from 45 to 450 Ib 20 to 200 kg each You could be crushed to death or very seriously injured if the flowmeter slips during installation and strikes you or falls on you Handle with care when installing and be sure that hoisting apparatus can safely lift the total weight of the flowmeter see Section 5 1 Use the lifting brackets provided on the sensor see drawing in Sections 2 2 and 2 4 N WARNING Before installation make sure the operating environments of the flowmeter and ancillary equipment are consistent with appropriate national approvals such as USA UL or NEC Canadian CSA European CE The installation must be carried out by qualified personnel only Read the ent
12. he European ATEX Zone 2 areas the remote 441 le transmitter must be used in the safe area It is a requirement of approval for CSA and NEC that cables must run in conduits for the connection of the ChannelMag sensor s to the transmitter Conduit connectors are provided for this For ATEX Zone 2 requirements conduit is not necessary For a single ChannelMag sensor or remote junction box for use with multiple ChannelMag sensors that are Entela approved to ATEX Zone 2 standards it is conditional that the reference coil exciter coil and electrode cables emanate from 3 separate cable glands Alternatively the reference coil and exciter coil may run in a 4 core cable consisting of 2 x 2 core each pair individually shielded and where the 2 core shielded electrodes cable is separated from it All such cables must be IEC approved and is normally supplied by ARKON The IEC cables may have identification other than black and white but they will be clearly labeled All ChannelMags and junction boxes must be potted with 3M re enterable gel type 4442 or type 8882 This is normally supplied with a junction box for each system Dual ChannelMag sensors are normally supplied with a remote dual entry junction box and is wired as shown below For single sensor ChannelMags Sensor 2 on the diagram is omitted Cables running greater than 30 feet 10m after the junction box to the transmitter must have the electrode pair cable separated from the exciter coil pair cab
13. he drawing for clarity For Entela approval for Zone 2 or Class 1 Div 2 areas see notes in Section 2 6 2 12 ChannelMag Section 2 Installation 2 4 2 Installation of 2 x CM2 ChannelMag Sensors Adjust width before installation into channel 2 00 50m Lifting brackets Do not lift by the Actual CM2 Width enhancement plates For CM2 sensors installed in a recess in the bed of the channel the installation configuration remains the same 1 4 6 3mm thick base plates with the recess must extend over the full channel width countersunk 1 4 screws from the bottom Advised Width of Channel The height E of the magnetic enhancement plates is custom made and normally extends to 4 100mm nominally above the maximum level The width W is adjustable to fi t the channel width W includes the mounting brackets 13 ChannelMag Section 2 Installation 2 4 3 CM2 D Dimensions and Approximate Weight The CM2 D is normally used with a FMX167 hydrostatic level transducer and installed as shown below A 2 part re enterable gel type 4442 manufactured by 3M Company St Paul Minnesota is normally supplied to retain the CM2 D in the hole made for it The 2 part gel is mixed together in equal amounts It makes approximately gallon 4 5 liters of gel which should suffice for the installation of CM2 D The hydrostatic level transducer must be installed in a stilling well as shown such that the level is not affected by the imp
14. ire manuals before attempting to install or operate the equipment including for ancilliary equipment The flowmeter electronics require normal AC power supply The flowmeter and ancillary equipment produces no electro magnetic fields that are harmful to the environment or to personnel They are certified as such to meet European CE requirements o0 ChannelMag Section 2 Installation 2 1 Media Considerations 2 1 Location and Mounting The ChannelMag is suitable for such media as water raw sewage slurries algae laden river water and similar The minimum media conductivity is 0 5 microS cm for operation with pulsed AC transmitters Most water based media has a conductivity of 200 800 microS cm The ChannelMag may be permanently coated with sewage grease algae calcium carbonate iron oxides or similar without affecting accuracy No cleaning is necessary If there is non fluidic sediment on the bed of the channel then the ChannelMag should sit on the channel bed with its upper most surface above the channel bed Ramps are then required see Section 2 2 All PM2 ChannelMag sensors are supplied with ramps Check the compatibility of the media with the wetted parts before installing With some media its consistency and operational temperature range can affect this compatibility Make sure the pressure of the media acting on the sensor s and the operational temperature does not exceed that specified For lifting the Ch
15. le by a minimum of 2 feet 0 5m The reference coil pair cable may be run in the same conduit as the electrode pair cable The maximum cable length is limited to 300 feet 100m See Section 2 5 21 ChannelMag Section 2 Installation 3 1 Calibration and Range Factors For multiple ChannelMag systems the electrode and reference cables may all run in the same conduit to their respective transmitters but separated from the exciter coil cables by a minimum of 2 feet 0 5m Multi exciter coil cables may all run together in a single conduit even with other power cables Again the multi exciter coil cables must be separated from the reference and electrode cables by a minimum of 2 feet 0 5m The calibration data is provided on the NIST traceable Calibration Certificate as well as on a label inside the 4411e transmitter Details of adjustments in a fl ow range are provided in the 441le instruction manual 22 ChannelMag Section 4 Maintenance 4 1 Cleaning 4 2 Zero Span Checking 4 3 Effect of Moisture Ingression 4 4 Effect of a Grounded Electrode 4 5 Effect of One Sensor Of Two Inoperative Under typical operating conditions the ChannelMag sensor requires no maintenance Due to the uniquely high signal to media noise ratio the affects of such coatings as algae sewage grease calcium carbonate iron oxides or similar coatings have no affect on published accuracy As such cleaning of coatings is normally unnecessa
16. lled in a channel with a minimum of 7 straight channel widths Channel Pipe upstream and 4 straight channels downstream as shown in the diagram below For bi directional 2 3 1 Straight Lengths use a minimum of 7 straight channel widths are required upstream and downstream of Channel CM2 The straight lengths are measured from the end of the ramps When ramps are not supplied and the ChannelMag CM2 sensor s is inserted into a recess in the base of the channel then the straight lengths are measured from the end of the CM2 sensor W channel width not necessarily the width of the CM2 sensor 7W upstream minimum length2W downstream minimum length must be 7W for bi directional fl ow L overall length with or without ramps The ChannelMag and installation conforms to German DIN 19559 and German Waste Water Institute ATV Arbeitsgruppe 1 2 5 requirements 2 3 2 Straight Lengths The ideal location in the pipe is where there is a maximum straight length The table below of Pipe PM2 provides recommendations of minimum straight lengths of pipe for various pipe configurations Shorter lengths or other configurations affect published accuracy dependant on pipe size and velocity range Consult ARKON or a qualified representative Diametrically opposite sensors are either pair or 2 pair When an ultrasonic level transducer is used for partially filled pipe applications it must be located at least 8 200 mm before or after the ends of the
17. loss of life or serious personal injury unless avoided The emphasis is on clear and immediate threats to your life or safety N WARNING WARNING describes situations that could result in loss of life or serious personal injury unless avoided The emphasis here is on the potential for a serious accident CAUTION CAUTION describes situations that may result in moderate personal injuries property damage or damage to the equipment unless avoided v Note NOTES draw your attention to particular features practices tips or other information useful in setting up or operating the product ChannelMag Table of Contents Section 1 Introduction 1 1 Scope ChannelMag CM2 1 2 Scope ChannelMag PM2 1 3 Safety Section 2 Installation 2 1 Media Considerations 2 2 Location and Mounting 2 3 Straight Lengths of Channel Pipe 2 3 1 Straight Lengths of Channel CM2 2 3 2 Straight Lengths of Pipe PM2 2 3 3 Important Note 2 4 Installation Dimensions and Approximate Weights 2 4 1 CM2 Sensors 2 4 2 Installation of 2 x CM2 ChannelMag Sensors 2 4 3 CM2 D Dimensions and Approximate Weights 2 4 4 PM2 Sensors in Full Pipes 2 4 5 PM2 Sensors in Non Full Pipes 2 4 6 Installation of PM2 Sensors With Magnetic Enhancement Band 2 4 7 ChannelMag PM2 Enhancement Plate Expander Mechanism 2 4 8 ChannelMag PM2 Weights and Dimensions 2 5 Grounding 2 6 Cable Types 2 6 1 ChannelMag Junction Box Wiring Diagram 2 6 2 ChannelMag Entela Approval 2 7 Ca
18. n a hydrostatic level transducer is used it is normally installed in the ramp with its sensing at the point of the ramp This also avoids critical flow drops or rises in the media level above the ChannelMag sensor Nominal Actual Weight CM2 CM2 L S R H M Each Width Width in mm in mm in mm in mm in mm in mm in mm lb kg 8 0 200 10 0 254 40 0 1016 8 0 203 14 5 370 2 50 64 6 0 152 55 25 24 0 600 26 0 660 60 0 1520 25 0 610 18 0 460 3 12 80 12 0 305 186 85 40 0 1000 42 0 1066 80 0 2030 40 0 1020 20 0 510 3 50 89 24 0 610 355 165 11 ChannelMag Section 2 Installation The height E of the magnetic enhancement plates is custom made and normally extends 2 50mm below the top of the channel The width W is adjustable to fit the channel width W includes the mounting brackets Epei Lihai Fated Use i Vira bolii Chanceifiay wical kanp in Chaaral Bed Recess Se Aust edith before installation ints chamel Lifting teackets Bonet It by the 1 4 6 3mm thick base plates with countersunk 1 4 screws from the bottom Actual CME wath W Note A CM2 8 sensor is always supplied with ramps Cables from each sensor are to run in separate conduits to the ChannelMag junction box situated above the level of the flowing media The cable runs are omitted in t
19. raceable facility available ChannelMags are calibrated in accordance with ISO approved methods Each ChannelMag system is normally supplied with a NIST traceable Calibration Certificate Magnetic enhancement plates are fixed to and calibrated with the ChannelMag sensor s The enhancement plates are custom made to the required diameter of the channel Their purpose is to determine the distribution pattern of magnetic flux on calibration in ARKON test laboratory and to insure it is the same as the distribution on site In this way the test calibration is the same as on site The other function of the enhancement plates is to retain the ChannelMag sensors in place in the pipe They incorporate an expander mechanism which holds the sensor s firmly in place without the need of further fixtures or to cut holes in the pipe ChannelMag sensors generate a uniquely powerful magnetic field over the whole cross sectional area of the pipe They operate using Faraday s Law where a conductor moving in a magnetic field induces a voltage the amplitude of which is proportional to the velocity of the conductor The conductor is the media being measured Large conical electrodes on the PM2 sensor measure the voltage signal which is the mean velocity weighted to account for the complete cross sectional velocity profile The signal is unaffected by media viscosity or density Volumetric flow in partially filled pipes is computed in the 441le by multiplyin
20. ramps to avoid drops in level due to sub critical flows or rises in level due to super critical flows When the hydrostatic level transducer is employed its level sensing position is virtually at the start of the upstream ramp and avoids critical flow rises and falls ChannelMag Section 2 Installation 2 3 3 Important Note 2 4 Installation Dimensions and Approx Weights 2 4 1 CM2 Sensors Pipe Confi guration 90 bend upstream and downstream After a tee Upstream partially closed valve Downstream partially closed valve Downstream Single Sensor Number of Straight Pipe Diameters D Upstream v Note minimum dead band for the ultrasonic level transducer Multiple Sensors Number of Straight Pipe Diameters D Upstream Downstream sensors caused by sub critical flows or level rises caused by super critical flows When using an ultrasonic level transducer or a hydrostatic level transducer in a stilling well it must be installed at least 1 channel width before or after the ends of the ramps when the ChannelMag sensor lies on the channel bed This avoids surface level drops directly above the These critical flows are circumvented if the CM2 is let into a recess in the bed As such the upper surface of the CM2 sensor may be up to 1 25mm above the channel bed to avoid silt build up The ultrasonic level transducer may then be mounted directly above the CM2 sensor s Note the Whe
21. rface of the ChannelMag is not higher than a suggested 2 12mm above the bed of the channel but enough to avoid excessive silt or similar build up If higher than this is necessary then the 14 ChannelMag Section 2 Installation step should be cemented with an approach angle of not more than 15 degrees The recess must extend over the full width of the bed of the channel to accommodate the Magnetic Enhancement Plates Note CM2 8 ChannelMag sensors are normally supplied with ramps 2 4 4 PM2 Sensors in ChannelMag PM Series sensors are used for full pipe flow measurement from 20 Full Pipes 120 500 3000 mm diameter For 20 47 500 1195 mm diameter a single sensor or double sensor is used dependant on the number of straight lengths of pipe available For 48 120 1200 3000 mm diameters either 2 sensors or 4 sensors are used again dependant on available straight pipe lengths The sensor s are attached to a stainless steel retention band designed for a specific pipe internal diameter The retention band is equipped with an expander mechanism which opens out against the pipe internal diameter to secure the sensors In this way the pipe wall does not require holes or fixtures and is ideal for concrete tunnels Full Pipes Single or Double Sensors Full Pipes Double or Quadruple Sensors 20 47 500 1195 mm Diameters 48 120 1200 3000 mm Diameters ChannelMag Section 2
22. ry Should there be silt or similar non fluidic build up the upper surface of the ChannelMag sensor must be cleaned However with the ramp construction the upper surface it is highly unlikely to become covered with silt or similar When the CM2 is in a recess in the bed of the channel it is recommended to have its upper surface slightly above the bed of the channel but not more than 1 2 12mm This avoids excessive silt or similar build up as well as avoiding too much turbulence due to the step from the bed to the upper surface If more than 1 2 12mm is required then the step to the upper surface should have suitable grouting at an angle of less than 15 With the ChannelMag sensor connected to the 441le transmitter check for zero and span in accordance with the 441le Instruction Manual This confirms the electrical function of the transmitter Note Bad grounding will not affect the electrical zero and span test The exciter coils of the ChannelMag sensor should be checked at the transmitter end Remove from terminals 4 5 and shield 6 There should be a minimum 10Meg Ohms typically gt 20Meg Ohms between 4 and 6 and 5 and 6 respectively If there is less than 10Meg Ohms moisture has probably leaked into the sensor and or the cable resulting in signal instability The cable should be inspected for damage or dried out or cut away where any moisture may be If the sensor has leakage it must be returned to ARKON or approve
23. s on site For channels less than 10 250 mm or wider than 15 feet 4500 mm or when used with ChannelMag type CM2 D the effectiveness of the enhancement plates is minimal so they are not normally supplied ChannelMag CM2 sensors generate a powerful magnetic field over the whole or significant area of the channel They operate using Faraday s Law where a conductor moving in a magnetic field induces a voltage the amplitude of which is proportional to the velocity of the conductor The conductor is the media being measured Large conical electrodes on the CM2 sensor measure the voltage signal which is the mean velocity of the complete cross sectional flow and is unaffected by media viscosity or density Volumetric flow is computed in the 441 le by multiplying level x mean velocity The level signal from a diverse range of cross sectional shapes can be linearized in the 441 le Level is measured normally by a high resolution ultrasonic level transducer If the level sensor needs to be hidden from view or if there is substantial froth on the media surface then a high resolution pressure transducer is used under the ramps of the CM2 sensor Chanel Mag Section I Introduccion 1 2 Scope ChannelMag PM2 The ChannelMag PM2 Series is suitable for full or partially full pipes from 20 to 120 500 3000 mm They meet or exceed the requirements of ISO 9213 and are calibrated in a long open tank believed to be the largest NIST t
24. tever precautions are necessary to ensure your safety before making an installation or working on one Never work alone or unsupervised Install and operate this product in accordance with all applicable safety and health regulations as well as any appropriate local ordinances This product may be installed in confined spaces Examples of confined spaces are manholes pipelines digesters and storage tanks These places can be dangerous or fatal if you are not suitably prepared The primary hazards of confined spaces are the possibility of poisoned air and the lack of proper ventilation Work in such places is governed by OSHA 1910 146 and may require a permit before entering The other major hazard particular to this product is its extreme weight which makes it dangerous to handle and creates the risk of being crushed or struck by the unit during installation This manual may also contain Material Safety Data Sheets MSDS for chemical agents supplied or recommended for use with this product If needed these sheets will be in the MSDS Appendix These sheets provide information about possible hazards from the chemicals Additional MSDS covering various proprietary agents name branded or trademarked mixtures that can also be used with this product are available from the manufacturers of those agents This manual uses the following notations to set apart hazard warnings and notes DANGER DANGER describes situations that will result in
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