ST-H SENSOR. Instruction Manual PL-527 January Rev. 1.6

Transcription

1 ST-H SENSOR Instruction Manual PL-527 January Rev. 1.6 ST-H SENSOR

2 Safety Guidelines Warning notices must be observed to ensure personal safety as well as that of others, and to protect the product and the connected equipment. These warning notices are accompanied by a clarification of the level of caution to be observed. Qualified Personnel This device/system may only be set up and operated in conjunction with this manual. Only qualified personnel are authorized to install and operate this equipment. Qualified personnel are defined as persons authorized to commission, ground, and tag circuits, equipment, and systems in accordance with established safety practices and standards. Warning: This product can only function properly and safely if it is correctly transported, stored, installed, set up, operated, and maintained. Note: Always use product in accordance with specifications. Copyright Siemens Milltronics Process Instruments Inc All Rights Reserved This document is available in bound version and in electronic version. We encourage users to purchase authorized bound manuals, or to view electronic versions as designed and authored by Siemens Milltronics Process Instruments Inc. Siemens Milltronics Process Instruments Inc. will not be responsible for the contents of partial or whole reproductions of either bound or electronic versions. Disclaimer of Liability While we have verified the contents of this manual for agreement with the instrumentation described, variations remain possible. Thus we cannot guarantee full agreement. The contents of this manual are regularly reviewed and corrections are included in subsequent editions. We welcome all suggestions for improvement. Technical data subject to change. MILLTRONICS is a registered trademark of Siemens Milltronics Process Instruments Inc. Contact SMPI Technical Publications at the following address: Technical Publications Siemens Milltronics Process Instruments Inc Technology Drive, P.O. Box 4225 Peterborough, Ontario, Canada, K9J 7B1 techpubs@milltronics.com For the library of SMPI instruction manuals, visit our Web site: Siemens Milltronics Process Instruments Inc. 2001

3 ABOUT THE TRANSDUCER The ST-H operates in association with Milltronics ultrasonic level monitoring products. The converts the electrical energy of the transmit pulse from the transceiver into acoustical energy. It then converts the acoustical energy of the echo back into electrical energy for the transceiver receive period. The effective acoustical energy is emitted from the face and radiated outward, decreasing in amplitude at a rate inversely proportional to the square of the distance. Maximum power is radiated axially (perpendicular) from the face in a line referred to as the axis of transmission. Where power is reduced by half ( 3 db), a conical boundary defining the sound beam, centered about the axis of transmission, is established. The diametric measurement of the cone in degrees defines the beam angle. Impedance matching techniques are used to optimize the transfer of power from the into air and vice versa. face 3 db boundary axis of transmission, perpendicular to face The ST-H incorporates an integral temperature sensor that reports the air temperature at the to the transceiver. The connection is transparent, in that both the ultrasonic and temperature components of the use the same wires. PL-527 3

4 SPECIFICATIONS Model :» ST-H Measurement range :» typically m ( 1-33 ft ) Environmental :» location :» indoor / outdoor» altitude :» 2000 m maximum» ambient temperature :» 20 to 60 C ( 5 to 140 F)» pollution degree :» 4 Pressure : Supply source : Frequency :» vent to atmosphere» shall only be supplied by a Milltronics certified controller» typically 43 KHz Beam angle :» 12 Weight * : 1.4 Kg ( 3 lb ) Construction : Separation : Approvals :» exposure : Tefzel base and lid (epoxy fitted joint)» mounting : 2" NPT, 2" BSP or PF2 process connection» options :» flange adapter, refer to associated instructions» submergence coupling refer to associated instructions» cable : 2 wire twisted / shielded, 0.5 mm 2 (20 AWG), PVC jacket» typically 365 m (1200 ft) from transceiver» CE, CSA, FM, BASEEFA / CENELEC * approximate shipping weight of with standard cable length EMC performance available upon request Tefzel is a registered trade mark of Dupont for chemical application check compatibility of Tefzel and epoxy, or mount joint external to process Safety Precautions The symbol is a warning symbol. Instruction labels bearing this symbol have been affixed to the the s to alert you to precautionary measures which you must take before the s can be put into operation. OK to use where there is corrosive environment. DO NOT use in a corrosive environment. PL \08\07

5 The ST-H body is a two part design moulded in Tefzel (EFTE) with internal parts potted in epoxy. The joint between the upper and lower sections is not a hermetic seal. If the is mounted exposing the joint to an environment that will attack epoxy the integrity of the will be compromised. This can result in the top section separating form the main body of the. For environments that are compatible with Tefzel but may degrade epoxy the must be mounted through a flange or stub mount using the 2" thread on the lower section of the. The joint between upper and lower sections of the must be isolated from the corrosive environment Should separation occur the risks identified result from live circuitry being exposed to the hazardous (risk of an explosion) environment. A malfunction of the level system may also result which may affect the process to which the ultrasonic ranging system is being applied. OUTLINE AND DIMENSIONS 1" NPT conduit thread 2" NPT 2" BSP or PF2 mounting thread (process connection) 74 mm (2.9") 119 mm (4.7") 87 mm dia. (3.4") 82 mm (3.2") PL \08\07

6 MOUNTING DO S AND DONT S Special handling precautions must be taken to protect the face of the from any damage. Mount the so that it is above the maximum material level by at least the blanking value. Refer to the associated transceiver manual. On liquid applications, the must be mounted so that the axis of transmission is perpendicular to the liquid surface. On solids applications, a Milltronics Easy Aimer should be used to facilitate aiming of the. Where the is mounted to a standpipe, the inner standpipe surface and end must be smooth and free of burrs, ridges and seams. Consider the optional temperature sensor when mounting the. Do not overtighten mounting. Hand tightening of the mounting hardware is sufficient. Do not mount the directly to metal. Use a PVC coupling and nipple as provided. Safety Precautions - Chemical Applications The joint between the upper and lower body sections is not a hermetic seal, and as such is subject to vapour ingress. If the ST-H is mounted such that the joint is exposed to an environment that will attack the epoxy, the integrity of the will be compromised. This can result in the top section of the separating from its main body. Do not expose to chemical concentrations that would corrode the Tefzel casing or the internal epoxy compound. Follow the stipulated mounting instructions on pages 7 to 9. Corrosion can expose electrical circuitry to the atmosphere, risking explosion if volatile or explosive dusts or gases are in sufficient concentration. PL \08\07

7 MOUNTING INSTRUCTION - SOLIDS APPLICATIONS WHERE THERE ARE NO CORROSIVE MATERIALS Optional Easy Aimer Easy Aimer (typical model) In solids applications, the should be mounted so that it is aimed toward the low level draw point. To facilitate this mounting, it is suggested that the optional Milltronics Easy Aimer be used. PL \08\07

8 MOUNTING INSTRUCTION - LIQUIDS APPLICATIONS WHERE THERE ARE NO CORROSIVE MATERIALS Flexible Conduit Bracket flexible conduit steel plate coupling Flexible conduit mounted should not be subjected to wind, vibration or jarring. Submersible Plywood rigid metal conduit coupling Submersible, used in applications where flooding is possible. submergence shield Plywood mounting provides excellent isolation, but must be rigid enough to avoid flexing if subjected to loading. nipple welded to blind flange Blind Flange coupling Flange, gasket and hardware supplied by customer. Refer to Liquid \ Applications - Standpipes. PL \08\07

9 MOUNTING INSTRUCTION - LIQUIDS APPLICATIONS WHERE THERE ARE CORROSIVE MATERIALS Blind Flange Flanged coupling Milltronics flange adapter Flange, gasket and hardware supplied by customer. Refer to Liquid \ Applications - Standpipes. Customer flanged standpipe. If a metal flange must be welded to pipe, refer to Liquid \ Applications - Standpipes. Coupling Coupling 2" coupling welded to tank top PL \08\07

10 INTERCONNECTION Milltronics transceiver ( typical ) Direct Connection For EnviroRanger ERS 500 only, connect all three wires separately. blk wht drain / shield 2 Wire Extension wht blk junction box For EnviroRanger ERS 500 only, connect all three wires separately. drain / shield extend cable using 18 AWG shielded / twisted pair Coaxial Extension When connecting to an EnviroRanger ERS 500, do NOT use coaxial cable, use a 2-wire extension as illustrated above. extend cable using RG - 62 A/U coax for optimum noise immunity PL

11 DO S AND DONT S Installation shall only be performed by qualified personnel and in accordance with local governing regulations. For optimum isolation against electrical noise, run cable separately in a grounded metal conduit with no other cabling (except temperature sensor). Ground shield only at transceiver. Insulate shield at junctions to prevent inadvertent grounding. Seal all thread connections to prevent ingress of moisture. For BASEEFA Zone 0, cable must be terminated externally to Zone 0 in an appropriate manner. The cable must be protected against mechanical damage, and arrangements sealed to prevent migration of atmosphere from Zone 0. For BASEEFA Zone 0 to reduce risk of electrostatic discharge, housing (except face) must be covered with copper mesh and grounded. Do not route cable openly. Do not run cable near high voltage or current runs, contactors and SCR control drives. PL \08\07

12 APPLICATIONS The is to be used only in the manner outlined in this instruction manual. Normally, the requires no cleaning or maintenance. However, if performance changes are observed, immediately shut down the level measurement system and perform a thorough inspection, especially on the. LIQUID APPLICATIONS - STILLING WELL / Open Channel Flow Measurement blind flange air vent TS-3 * standpipe inlet bracing standpipe primary element stilling well stilling well inlet Refer to Liquid \ Applications - Standpipes. * the use of a TS-3 temperature sensor provides better temperature tracking in applications where the temperature can change quickly. PL \08\07

13 LIQUID APPLICATIONS - STANDPIPES In many applications access must be made via a standpipe. In such cases, a Milltronics flange adapter can be used to mate to the flanged standpipe. Another option is to hang the from a blind flange, respecting chemical compatibility. The standpipe length should be as short and the diameter as large as possible. As a rule of thumb, the -3 db cone of the sound beam should not intersect the standpipe wall in applications opening into a vessel or larger area. Otherwise, additional blanking will be required to compensate for the interference zone created by the opening. flanged no intersection no vessel vessel no additional blanking required no additional blanking required nipple welded into a blind flange nipple welded into blind flange can read level inside or below standpipe sound beam intersects standpipe end cut on a 45 angle typically no additional blanking required vessel near blanking extension of 150 mm (6") past end of standpipe may be required. reflection at interference zone created by opening PL

14 LIQUID APPLICATIONS - VOLUME Alternate Preferred Bad Maintain full level for full calibration. Above this level erroneous readings will result as level has entered blanking zone. (shaded area) tank manufacturer s full level beam angle span : corresponds to tank manufacturer s empty level. rise Empty level for alternate location. Below this level, echo would reflect away from the. tank manufacturer s empty level may require target to obtain empty reading discharge 1. Beam should not detect bin bottom. If this occurs use range extension parameters (on transceivers where available) to omit false echoes. A 12 beam angle represents a rise : run of about 10 : 1. In most tanks, the should be centered as much as possible (without interference from inlet) for optimum reading range. 2. Sound beam must be perpendicular to liquid surface. If standpipe is used, refer to Liquid / Applications - Standpipes. 3. Echo has missed improperly leveled. 4. When performing an empty or full calibration, the tank must contain its normal vapour and be at its normal temperature. PL

15 LIQUID APPLICATIONS - WATER / WASTEWATER DIFFERENTIAL LEVEL PUMP CONTROL SEWAGE LIFT PL \08\07

16 SOLIDS APPLICATIONS - TYPICAL 1 Easy Aimer bin wall seams 3 2 filling profile emptying profile 1. Transducer angled to avoid seams in bin wall and aimed at discharge in order to read bin when empty. 3. Transducer too close to material inlet. Falling material will intersect sound beam and cause erroneous readings or loss of echo. 2. Avoid intersecting bin wall seams, structural members and wall irregularities. Otherwise, minimal angle of repose 5 4 discharge 4. On fluid like solids, aim perpendicular to material surface. 5. On dual discharge bins, aim each at the discharge point. PL

17 SOLIDS APPLICATIONS - SPECIAL STORAGE BIN WITH AGITATOR infeed agitator 1. Transducer should be kept away from infeed. 2. Where agitators are in use, use the Agitator Discrimination parameter on transceivers where available. 3. Transducer should be aimed away from wall projections. PL

18 SOLIDS APPLICATIONS - SPECIAL (con t) DRYER - WOOD CHIPS drag conveyor infeed typical low level typical high level 1. Transducer should be mounted perpendicular to slope of wood chips. PL

19 c Siemens Milltronics Process Instruments Inc.2000 Subject to change without priornotice Siemens Milltronics Process Instruments Inc. 1954Technology Drive, P.O. Box 4225 Peterborough, ON.Canada K9J 7B1 Tel: (705) Fax: (705) Printed in Canada