Weighing Gauge Geonor T-200B Manual US rev 8
Contents
1. 2B fo fo Where and f are new values and A B and f are the original calibration values See Section 2 13 or calibration sheet Check with precipitation in the bucket Fill the bucket with 1 kg of water If the water is free of air this equals a volume of 1 liter Water from the tap can contain considerable air which must be taken into account Boiling for 10 minutes can remove most of the air 1 kg 1 liter of water represents exactly 50 mm of precipitation Recalibrate the transducer if it differs by more than 0 596 from the value on the calibration sheet GEONOR offers factory recalibration service 5 5 Removing and replacing transducer Remove gauge cover Tighten setscrew on VW load cell Lift out bucket carefully Disconnect electrical leads from the transient arrestor Unhook the S hook from the bucket support dish Hold the VW load cell and remove knurled nut from top of adjustment screw Remove the VW load cell from square guide in the bucket support rim Install a new VW load cell in the reverse order see Section 2 5 5 IMPORTANT Loosen the setscrew before replacing the gauge cover GEONOR model P 520M portable frequency counter 17 IMPORTANT The bucket support dish must be free to swing in all directions without noticeable resistance Resistance in the support links can contribute to error especially with low weights in the bucket When fitting a new transducer to the weighing sy2. Kjell Vien and E J Fgrland 1985 An Automatic Precipitation Gauge based on Vibrating Wire Strain Gauges Nordic Hydrology No 16 pp 193 202 Tunbridge Lloyd and Kjell Vien 1988 The advantage of Vibrating Wire Instruments in Geomechanics 2 Int Symposium on Field Measurements in Geomechanics Balkema Rotterdam ISBN 90 6191 7786 Also publ In Norwegian Geotechnical Institute NGI internal report 55100 7 April 1987 11 4 MOUNTING INSTRUCTIONS FOR WIND SHIELD All dimensions are in mm unless specified Measure and mark 500 mm from the threaded end on the horizontal pipes The horizontal pipes do not have slots cut out of the threads gt 500 mm The distance from underneath the stop pin to the top of the vertical tube is 817 mm The stop pin needs to be hammered into the pre drilled hole Reduceing the diameter of the pin slightly by squeezing or hammering to will make it easier to get started Stop Pin 817 mm 12 Screw in the horizontal tubes a Slide the Kee clamps on as shown until they coincide with the 500 mm mark Make sure all vertical holes are on the same side on the right or the left yl pa x Align the clamps vertically 13 Place the 4 vertical pipes in the Kee clamp openings with cutout section at top Slide pipes down until the stop pin rests on Kee clamp The cutout section should not face the gauge This is where the wind shield ring will res
3. film of low viscosity oil to impede evaporation No electrical heating is therefore required thus eliminating a major source of error APPLICATIONS The T 200 was developed more than 15 years ago and the supplied units are continuously tracked in particular at vari ous meteorological institutes It is used by national weather services road authorities power companies airports avalanche prediction services and agricultural monitoring centres The performance and reliability of the instrument has been compared with other equipment in the WMO CIMO program Solid Precipitation Measurement Intercomparison and Geonor can supply the report on request MEASURING PRINCIPLE There are no mechanical moving parts The precipitation and antifreeze in the container are weighed with a sensor with a frequency output Its frequency will be a function of the applied tension i e the amount of precipitation can be computed This frequency is recorded as a square shaped 0 5 V signal which can be easily transmitted and interfaced to most data acquisition systems This measuring principle is well suited for remote locations requiring reliable and long lasting instruments The precipitation can be measured at any intervals occasion ally or up to several times per minute This allows for accurate measurements of the precipitation intensity Geonor supplies excitation units cards to interface to most programmable frequency counters Geonor supplies a
4. for windshield 470212 Unbraco key Allen wrench 14 for windshield PEDESTAL 470400 Pedestal 1 0 m galvanized 470450 Pedestal 2 5 m galvanized PORTABLE READOUT UNIT 450000 P 520M Read out Unit for VW Sensors portable w charger 100 x 200x 25 mm INTERFACE Hybrid Circuit 455000 The TH 501 interface amplifies and converts the sine wave output of a GEONOR VW transducer to a square wave This facilitates data logging The TH 501 isa stand alone circuit board 20 x 35 mm It is normally supplied in a box with 35 mm DIN rail clips for easy mounting in a field terminal box Versions of the TH 501 provide a 0 5 V 4550504 or 2 5 to 2 5V square wave output 455055B There is an option 455060C to switch on off the VW transducer between readings to conserve power CABLE 461000 P 540 Cable Standard cable 10 mm Y 2 wire double PE jacket braided shield 19 7 DRAWINGS DIAGRAMS FIGURES 7 1 7 2 7 3 7 3 7 4 7 5 7 6 7 7 7 8 T 200B Gauge vertical cross section shows parts 21 Electrical hook up of transient arrestor junction box 22 Electrical hook up of TH 501B Hybrid 23 Alter shueld details 5 5 esie een up Eran eaa Ea PESCE OKT 24 Base plate det il bed eda uE SHARM Y NX PUR QOL VUE RUE Ou Ip PRG D EDU EAM 23 Concrete foundation block 24 Gauge
5. with 1m pedestal and Alter windshield 25 Photograph of installed Precipitation Gauge 26 T 200B Gauge 27 20 GEONOR T 200B PRECIPITATION GAUGE Inlet Orifice Area 200 cm sq Inlet Cone Junction Box Upper Adjustment Suspension Flange Support 12 liter Sensor Locking Screw 5 Hook Toggle Clamp 3 Signal Cable Lower Adjustment Pedestal 21 Electrical Hookup of Transient Arrestor Junction Box TO SENSOR SHIELDED CABLE TO READOUT TH 501 INTERFACE 22 TH 501B Wireing Data Acquisition System 23 1230 dia zs g AMPORTANT SCADNUTS See Section 5 12 4 SEGMENTS E a ER ES zz y 7 4 CONNECTORS 24 DISTANCE PIECES 4POSTS 32 Blades Y 38 S CLAMP Pd GALV PIPE tl T 406 760 817 160 25 FOUNDATION BLOCK Wooden template to assist spacing bolts during grouting 400 O 300 300 O O M20 or 7 8 in bolts minimum Minimum 150 mm of thread exposed on the mounting bolts for the reaction nut amp washer the pedestal and clamping nut amp washer 375 minimum Depending on location and snow conditions the top of the foundation can be elevated When foundation is lev
6. 5 Removing and replacing Ian UC edil 17 5 6 Rust protection maintenance oboe reis 18 PARTS LIST 6 19 DRAWINGS DIAGRAMS FIGURES 7 20 7 1 7 2 7 3 7 4 7 5 7 6 7 1 7 8 Gauge vertical cross section shows partrts 21 Electrical hook up of transient arrestor junction box 22 Alter windshield details 23 Base plate Held s isinir uuu p Du er 24 Concrete foundation block iei redes 23 Gauge with Im pedestal and Alter windshield 26 Photograph of installed Precipitation Gauge 2T T 200B Gauge Specifications o is 28 1 INTRODUCTION PRECIPITATION GAUGE 1 1 Principle of Operation The T 200B is one of the T 200 series weighing bucket precipitation gauges It has a 600 mm 24 inch capacity It weighs the precipitation using a precision load cell with a vibrating wire VW transducer The T 200B gauge uses a standard 12 liter bucket suspended from 2 chains and the load cell Each supports 1 3 of the weight Provided the gauge is carefully leveled to ensure equal load distribution 1 load cell wi
7. GEONOR T 200B PRECIPITATION GAUGE USER MANUAL Rev GU 20030829 TABLE OF CONTENTS T 200B PRECIPITATION GAGE INTRODUCTION PRECIPITATION GAUGE 1 4 IL Principle of iia 4 1 2 Why IIS T MR 4 M PLY UUW C INSTALLATION Y rio 5 2 1 Locate gauge away from structures and obJects 5 2 2 Plan height of collection 5 2 3 Foundation considerations adas 5 2 4 Pedestal mstallati n cis 6 2 5 Precipitation gauge 1 7 2 6 Electrical ii 8 2 1 Antifreeze as TCG siii lts 9 2 8 Hydraulic Oil to Eliminate Evaporation 10 2 9 Loosen Setscrew on transducer uiscera HR 10 2 10 Replace gatge COVER 10 2 11 Install Alter Type Windshield see Section 4 10 2 12 Hook up data logger and begin readings 10 REFERENCES rasa 11 MOUNTING INSTRUCTIONS FOR WIND SHIELD 4 12 15 MAINTENANCE Decoradas 16 5 1 Tools n eded 16 5 2 cuu dica MT 16 M T 16 5 4 Check the function of the transducer 17 5
8. aporation 2 9 Loosen Setscrew on transducer Unscrew the setscrew at least 4 revolutions to keep it clear of the vibrating wire It may be left in place while the gauge is collecting data If left in place make sure to wrap a piece of tape around it to make sure it will not come in contact with the vibrating wire If possible at this point it is recommended to make sure you have a good signal 2 10 Replace gauge cover 2 11 Install Alter Type Windshield see Section 4 To prevent undesirable effects of wind turbulence around the gauge a windshield must be installed Important Install the Alter type windshield 13 mm above the top of the T 200B orifice The GEONOR pedestal has windshield mounts on the pedestal This provides the specified 13 mm height above the top of the gauge orifice See Section 4 2 12 Hook up data logger or manual read out unit and begin readings The transducer should make an audible sound on applying electrical power to the system Vibration frequency runs from about 1000 Hz with an empty bucket to around 3000 Hz with a full bucket To calculate precipitation from frequency we use the following formula see calibrations certificates P A f fj B f fy Where P precipitation calibration certificates show precipitation in cm A amp B transducer calibration constants fo transducer frequency with empty bucket zero frequency f transducer frequency 3 REFERENCES 10 Bakkehgi Steinar
9. d in a cross North South amp East West Make sure bolts are vertical with 300 mm between N S bolt and 300 mm between E W bolt see Fig 7 5 A wood template can be helpful in positioning the anchor bolts also shown on Fig 7 5 2 3 1 1 Align anchor bolts on N S amp E W axes To minimize diurnal variations the anchor bolts should be aligned on N S and E W axes See Fig 7 5 2 3 1 2 Anchor bolt size length amp material Use 20 mm or 7 8 anchor bolts Thread sizes are metric M20x2 or U S customary 7 8 12 UNC Use a minimum length of 375 mm 15 inch with minimum 150 mm 6 inch of the thread above the foundation surface 2 3 2 Foundation in soil You need to size a concrete foundation see Fig 7 5 block to anchor the pedestal The size depends on the strength of the soil frost depth wind and other factors in your location Movement of the concrete foundation due to i e frost heave can cause the pedestal and gauge to tilt and lead to errors in the data and damage to the vibrating wire 2 3 2 1 Excavation depth Excavate for the concrete foundation block deep enough to avoid movement from frost heave or dynamic forces caused by wind etc Asa general guideline excavate 600 to 1000 mm deep 2 3 2 2 Size of concrete block foundation The height of the block can extend from flush with the ground to any required height depending on expected snow depth A typical concrete foundation block wid
10. el with ground the elevation of orafice will be 1 75 m 600 1000 26 For added protection apply two layers of a rust preventing coating such as paint zink spray or similar on all threaded parts IMPORTANT Do not apply rust preventing coating of any type to the gauge housing or inlet cone 27 Fig 7 7 Geonor Precipitation Gauge T 200 for Accurate Measurement of Snow Rain FEATURES Interfaces to most data acquisition systems More than 10 years of field use Automatic precipitation monitoring Designed in cooperation with the 9 Precipitation intensity be calculated Norwegian Meteorological Institute No internal heating DNMI No moving parts and the Norwegian Geotechnical Institute Easy installation and maintenance NGI 28 Fig 7 8 GEONOR 7 200 PRECIPITATION GAUGE DESIGN The T 200 precipitation gauge is designed for year round remote automatic precipitation measurements as well as for measurement of the intensity of precipitation The gauge consists of a protective housing with an inlet for precipitation and with a container for collecting snow rain The amount of precipitation is monitored by a weighing sensor The instru ment as well as a wind shield fence are fixed to a pedestal The gauge is very accurate despite its simplicity and is easy to install and maintain The precipitation is melted in the container partly filled with antifreeze topped with a
11. en using Ethylene glycol amp methanol Ethylene glycol mixture is toxic It should be drained into a plastic container for disposal according to appropriate regulations Fig 2 7 1 Ethylene Precipitation Collecies temperature cal Methanol liter volume f before freezing capacity liter 0 C 0 0 0 0 600 12 0 5 C 0 6 0 9 525 10 5 10 C 1 0 1 6 470 9 4 15 C 1 5 2 1 420 8 4 20 C 1 7 2 5 390 7 8 25 C 2 0 3 0 350 7 0 30 C 2 3 3 3 320 6 4 35 C 2 4 3 6 300 6 0 2 7 2 When using ETI Blend of propylene glycol methanol glycerine Fig 2 7 2 Min temperature ETI blend liter Precipitation before freezing capacity mm capacity tet 0 0 0 600 12 0 5 1 5 525 10 5 10 C 2 8 460 92 15 C 3 4 430 8 6 20 C 4 4 380 7 6 25 C 5 0 350 7 0 30 C 5 3 335 6 7 35 C 5 7 315 6 3 2 8 Add Hydraulic Oil to Eliminate Evaporation It is essential to add 0 4 liters thin oil winter and summer to retard evaporation losses We recommend Esso Exxon UNIVIS J13 aero hydraulic oil due to its very low solidification point You can also use other oils with a density less than water that do not 3 Check with local regulations regarding disposal become viscous in the temperature range anticipated Change the oil at least once a year to avoid deterioration which will result in increased ev
12. it will be exposed Geonor supplies a standard model P 540 cable For severe environments we recommend GEONOR P 430 armored cable Pass the cable through the cable gland strain relief connector on the base of the gauge Do not allow cable to contact support dish or bucket Use cable ties or adhesive tape Run cable through opening in bucket support rim Hookup the positive cable to terminal 5 and the negative cable to terminal 3 See Fig 7 2 Pull out cable slack and tighten the cable gland The transmission distance between gauge and data collection terminal can be up to 1 km 3000 ft 2 6 3 Over voltage protection ground Connect the shield to terminal 1 on the transient arrestor Connect the shield cable to ground at the opposite end 2 7 Add antifreeze as needed When the gauge is operating below 0 C an antifreeze blend must be added to the bucket to melt frozen precipitation and to prevent freezing It is important to notice that the capacity of the collected precipitation is decreased when antifreeze is added The antifreeze becomes a part of the total volume collected Two types of antifreeze include 1 Ethylene glycol and 2 the more environmentally friendly Propylene glycol Methanol is added to adjust the density of the antifreeze to provide rapid melting Tables in the following sections show the amount of antifreeze needed to keep the collected precipitation from freezing at various temperatures 2 7 1 Wh
13. ll suffice The VW transducer was developed in the 1960 s at GEONOR s then parent research foundation The Norwegian Geotechnical Institute NGI Bakkehgi et al 1985 used the VW transducer in the T 200 gauge to measure rain and snow precipitation NGI developed the gauge due to need for an automatically recording snow gauge for avalanche research 1 2 Why it is used Since its introduction in 1985 based on the results of extensive tests approved by the WMO in Scandinavia it was adopted by the several Scandinavian meteorological institutes weather services Starting in the late 90 s U S and Canadian agencies have tested the gauge extensively with good results Consequently it has seen increasing use in North America 1 3 Advantages The VW transducer has certain advantages over other types of load transducers in precipitation gauges 1 It has little temperature sensitivity 2 good accuracy better than 0 1 of full scale 3 good resolution better than 0 01 of full scale 4 long term drift free performance measured by 27 year tests at NGI 5 compared to gauges that output analog voltage and current signals its pulse signal can transmit much farther along a cable without error 6 it has an advantage over tipping bucket type gauges with respect to resolution measurement of intensity and no moving parts 7 low power consumption makes it suitable for use in remote locations where batteries must be charged by s
14. lso an interface card to connect directly to a PC TECHNICAL SPECIFICATIONS 0 600 mm including antifreeze liquid Capacity Temperature range Sensor 25 C to 60 C standard can be shifted upon request Collecting area 200 cm _ Temperature drift 0 001 5 Sensitivity 0 1 mm Marerials Aluminum alloy 0 196 FS Size 390 mm H 760 mm Accuracy Repeatability 0 1 mm Mounting Universal 3 point with leveling system incorporated in base T 200B Precipitation gauge Part No Equipment Part No Equipment 455000 Excitation unit 470250 Windshield with stainless steel blades 455050 E 470400 Pedestal galvanized steel 1 m high Excitation unit for rail mounting 455055 Excitation unit for rail mounting modified for Campbell data loggers P27 Pedestal galvanized steel 2 5 m high 455065 Interface card with RS232 0 5V 4 20 mA output GEONOR INC GEONOR A S P O Box 903 109 Greenwood Circle P O Box 99 Rea Millord PA 18337 USA N 0701 Oslo Norway Tel 570 296 4884 Fax 570 296 4886 i E mail geonor geonor com www geonor com 29
15. olar panel or wind generator 8 it uses a 2 wire cable with power supply and signal superimposed and 9 its pulse signal is easy to log to a variety of data acquisition systems Currently the T 200 series includes T 200B T 200B3 T 200BW T 200BP models See References Section 3 2 INSTALLATION 2 1 Locate gauge away from structures and objects For best results locate the gauge where the wind is least affected by structures and objects 1 e as far as possible from walls buildings cliffs and trees etc Generally at least a 45 cone from the top of the inlet orifice should be open to the sky 2 2 Plan height of collection orifice Mount the gauge so the inlet orifice is a minimum of 50 cm 20 inch above the maximum anticipated snow depth and 1 75 m 70 inch over the ground for moderate conditions With the 1 m pedestal flush with the ground surface the T 200B orifice will be at 1 75 m For deeper snow a 2 5 m pedestal is available as an option 2 3 Foundation considerations in soil on rock or a structure IMPORTANT a rigid pedestal and foundation are needed for proper gauge performance Regardless of whether the pedestal is installed in soil on rock or on a structure the pedestal must be rigid enough to prevent movements and vibrations due to wind frost heave etc 2 3 1 Anchor bolts for concrete and rock The pedestal will be attached to the to the foundation block or rock with 4 anchor bolts oriente
16. ove gauge cover The gauge cover is one piece that includes the inlet orifice and inlet cone To remove the cover release the 3 clamps around the periphery NOTE Press wire hook sections into locking lugs to keep hooks from falling down and catching on base when you lift the cover The cover has a snug fit over the components inside the gauge Lift it straight up to clear the components 2 5 2 Place base mounting flange on pedestal The cast steel base has an M20x1 5 cable gland strain relief connector This fits cable diameters between 6 and 12 mm 7 4 and inch A drip ring is cast into the base so that external water runs off to protect the pedestal 2 5 3 Align holes to minimize diurnal variations in data When the sun heats the pedestal it bends very slightly so that the gauge tilts away from the hot side To minimize this diurnal effect on readings align the holes so that the gauge sensor is on an east west axis See Section 2 4 2 2 5 4 Insert gauge mounting bolts Insert the 3 M8x1 bolts through the holes in the base of the gauge and through the level adjustment screws that come already installed in the base Do not tighten Leave room to adjust Level the gauge using the hand level provided Adjust leveling screws as needed When the gauge is level tighten the 3 gauge mounting bolts 2 5 5 Install transducer amp support chains IMPORTANT Please note that the VW load cell has a locking set screw to prevent damage
17. ptacle at a lower level than the bucket Pump the siphon until flow starts IMPORTANT Do not suck on tube Antifreeze mixtures are toxic In absence of a suitable siphon or pump you can empty the bucket by hand Be very careful not to overload the VW load cell Use extreme care so as not to damage the vibrating wire Be sure to tighten the setscrew first To re level the gauge slacken the 3 M8x1 bolts See Section 2 5 4 Level the gauge using the hand level provided Adjust leveling screws as needed When the gauge is level tighten the 3 gauge mounting bolts Clean out the bucket Replace the bucket carefully in the weighing dish Remember to align the dot on the rim of the bucket with the one on the support rim Add required quantity of anti freeze mixture and anti evaporation oil Loosen the setscrew on the transducer Replace the gauge cover and lock the 3 toggle clamps 16 5 4 Check the function of the transducer Empty bucket check Level the bucket accurately see Sections 2 5 4 amp 2 5 6 Check the frequency with an empty bucket f value Use the data logger or GEONOR frequency counter Compare with the fo value on the calibration certificate for the transducer If the difference is equal or less than 10 Hz no adjustment is necessary If the difference exceeds10 Hz calculate a new value for constant A Use the new fo and the new A in your calculations Formula for calculating a new constant A with new f
18. stem use the new values for A B and f These are given in the calibration sheet accompanying the transducer 5 6 Rust protection maintenance For added protection apply two layers of a rust preventing coating such as paint zinc galvanizing spray or similar on all threaded parts of the pedestal and windshield 18 6 PARTS LIST Item code Description PRECIPITATION GAUGE 470000 T 200B Precipitation Gauge 1 sensor 471000 T 200B3 Precipitation Gauge 3 sensor option PRECIPITATION GAUGE PARTS 470001 Base Plate Mounting Flange cast aluminum 470004 Gauge cover aluminum 470009 Bucket 470010 Bucket support dish PRECIPITATION GAUGE ACCESSORIES 470800 Sensor Vibrating Wire Transducer 470013 Adjustment set upper screws chain amp S hook 470014 Adjustment set base 3 pieces req 455020 Junction box w transient arrestor 470021 Level for precipitation gage ALTER SHIELD 470250 Alter Shield complete ALTER SHIELD PARTS 470202 Spacer piece qty 24 470205 Segment blade qty 32 470203 Connector qty 4 470204 Setscrews for connector qty 8 2 on each connector 470206 Kee clamp qty 4 470207 Vertical pipe post for windshield qty 4 470208 Horizontal pipe brace for windshield qty 4 470209 Cap nut for top of vertical pipe post for windshield qty 4 Stop pins for horizontal pipe brace qty 4 Cir clips qty 4 Plastic cable holders qty 4 470210 Unbraco key Allen wrench 4 mm
19. t 817 mm Lay out the 4 shield ring segments Install blades and spacers with channel of blade facing out the 4 couplings for the shield ring act as spacers and the 4 areas for mounting on vertical tubes act as spacers This is where the ring will rest on the AW vertical risers A UVUVUUVVV 14 Place the ring carefully in the vertical slots in the vertical tubes Screw on the four 1 tube caps and tighten so the caps grip the ring Make final adjustments if necessary and retighten all screws Ensure that the upper end of the windshield blade approximately 13 mm 1 2 inch higher than top of the inlet orifice 15 5 MAINTENANCE 5 1 Tools needed Level 300 mm long Screw driver 4 mm blade Adjustable spanner wrench 0 27 mm Container for disposal of anti freeze mixture 12 liter minimum Funnel Measuring cup 1 liter 5 liters of water Rubber tubing approx 2 m 6 ft x 13 mm 1 2 inch ID for siphon Alternatively electric drill pump and suitable tubing 5 2 Service interval Service the gauge whenever the bucket needs to be emptied Inspection is recommended at least 2 times a year 5 3 Servicing Disengage the 3 spring toggle fasteners holding the gauge cover to the base and remove the housing see Section 2 5 1 Tighten the setscrew of the transducer to avoid damaging the vibrating wire Use a siphon pump or an electric pump to empty the bucket Remember to place the rece
20. th is 600 mm 2 ft square 2 3 3 Foundation on rock On a competent rock surface drill holes for anchor bolts see sec 2 3 1 Grout the anchor bolts in place at minimum depth of 200 mm Make sure there is sufficient thread to mount the reaction nuts pedestal and clamping nuts see Fig 7 6 2 4 Pedestal Installation IMPORTANT Please note that a stable pedestal is essential for accurate data If the pedestal is allowed to vibrate your data may degrade and the vibrating wire may break Tilting of the gauge will also affect your data and may eventually damage the vibrating wire 2 4 1 Pedestal details We recommend the T 200B gauge be mounted on a GEONOR pedestal GEONOR provides galvanized steel pedestals in 2 heights 1 m and 2 5 m however you can mount the gauge on any type of pedestal rigid enough to avoid damage from vibrations The top of the pedestal must have 3 tapped M8x1 holes to fit the bolts that connect the gauge to the pedestal 2 4 2 Installing pedestal Place the pedestal brackets over the anchor bolts so the triangle pattern of the 3 boltholes on the top of the pedestal points east or west Install counter nuts and washers on anchor bolts below the pedestal brackets to provide a level surface Mount the pedestal so the anchor bolts carry the entire weight of the gauge Install the upper washers and nuts Tighten nuts and check that the pedestal is level 2 5 Precipitation gauge installation 2 5 1 Rem
21. to the vibrating wire when installing and servicing the gauge This setscrew must always be tightened during installation removal service transport or shipping Install VW load cell in the square hole with a round hole beside it This hole is for the VW load cell cable Install chains in other square holes Connect chain S hooks to bucket support dish 2 5 6 Install bucket in support dish Align mark on bucket indented punch mark on rim with the location of the VW load cell This is to ensure correct calibration when the bucket is removed and replaced Carefully place the bucket in the support dish To level the bucket use the level provided and adjust the black knurled nuts on the chains and VW load cell Take cross readings to check level This is important to minimize errors in the data 2 6 Electrical hookup 2 6 1 Hook up cable from VW Load Cell to Transient Arrestor Run the cable from VW load cell through hole in the rim to green transient arrestor box mounted on the bucket support rim Hookup the red cable 4 to terminal 6 and the black cable to terminal 4 IMPORTANT Take great care to ensure that the cable does not come in contact with the suspended parts This can lead to inaccurate readings 2 6 2 Connect cable from transient arrestor to data collection terminal We recommend a two wire shielded cable with cross section area of leads of 0 5 mm 20 AWG The cable must be suitable for the environment to which
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