BDI ST350 Скачать руководство пользователя страница 1 | Manualshive

Страница: 1 / 30

BDI ST350 Скачать руководство пользователя страница 1

ST350 - STRAIN

TRANSDUCER

1
2
3
...
»

Содержание ST350

Страница 1: ...ST350 STRAIN TRANSDUCER ...

Страница 2: ......

Страница 3: ...nce approval Power ratings updated 3 0 7 20 18 Updated to include new corrosion protection Minor changes to specifications New template and styles were applied No part of this operations manual may be reproduced by any means without the written consent of BDI The information contained within this manual is believed to be accurate and reliable However BDI assumes no responsibility for errors omissi...

Страница 4: ...mer shall assume all costs of removing reinstalling and shipping of defective products EXCEPT AS STATED HEREIN BDI MAKES NO WARRANTIES EXPRESSED OR IMPLIED AND SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE OR MERCHANTABILITY Before returning any product BDI technical support must be contacted at 1 303 494 3230 or by visiting BDITEST COM contact and submitting a re...

Страница 5: ...4 Verifying ST350 Output 13 3 4 1 Resistance Test 13 3 4 2 Resolution Noise Test 14 3 4 3 Sensor Response Test 14 3 4 4 Field Adjusting Excessive Offsets 15 3 5 Verifying Accuracy 15 3 5 1 Factory Calibration 15 3 5 2 Items for Consideration for User Verification Tests 15 4 Installation 17 4 1 General Installation Guide 17 4 1 1 Prepare Mounting Area 17 4 1 2 Installation 18 4 2 Installation on St...

Страница 6: ...ignment Marking for ST350 Installation 18 Figure 6 Mounting Position Surface Preparation Marks 18 Figure 7 Typical ST350 Installation 19 Figure 8 Identifying Metric vs Imperial Tabs 19 Figure 9 Mounting Tabs on the ST350 using the Tab Jig 20 Figure 10 Marking ST350 Center Mounting Location 20 Figure 11 Tab Removal Tool TRT 21 Figure 12 TRT with a Tab Inserted 22 Figure 13 Removing a Tab with the T...

Страница 7: ...pandable anchors and screws 1 2 ABOUT THIS MANUAL This is a comprehensive document that explains the functions and features of the ST350 BDI also manufactures two types of data acquisition systems which will be referenced throughout the manual 1 Structural Testing System STS Rugged wireless battery powered DAQ that includes an intelligent Intelliducer connector design which makes the system extrem...

Страница 8: ...IN RANGE 4 000 µε Calibrated to 2 000 µε FORCE REQUIRED FOR 1 000µε 17 lb 76N TYPICAL SENSITIVITY 500 με mVout Vin ACCURACY2 1 CALIBRATION Individually calibrated using N I S T traceable automated system Calibration curve factor provided THERMISTOR OPTIONAL 3 kΩ NTC EFFECTIVE GAGE LENGTH 3 0 in 76 2 mm Gage Extensions available for R C structures CABLE Custom lead cable length made to order IC 02 ...

Страница 9: ...ng temperatures call BDI for wide temperature range cable options 2 2 OPTIONS AND ACCESSORIES The ST350 is supported by several available options and accessories depending on the application and use See Table 2 for a list of options and accessories that we supply Table 2 ST350 Options and Accessories OPTIONS AND ACCESSORIES Intelliducer Connector Required for use with STS data acquisition nodes ca...

Страница 10: ...BLE FORCES Individual force group balancing static LABORATORY TESTING Classroom teaching tool Measure responses for structural members and components Integrate with existing A D systems BUILDINGS ASTM Standard Floor Load Tests Construction Vibration Monitoring Concrete Curing Temperature Tracking Earthquake Response Monitoring 3 OPERATION 3 1 THEORY OF OPERATION The internal components of the ST35...

Страница 11: ...ss heats up and cools much faster than the large member the gage will attempt to expand between the anchored end blocks which creates a compression opposite of expected The same goes for a temperature drop which since STOP It is important to note that the portion of the ST350 housing that the label is affixed to the lid is actually floating and is only held in place through the weatherproof pottin...

Страница 12: ...o be used in the field 3 3 CONNECTING TO DATA ACQUISITION SYSTEMS This section outlines how to connect and test the ST350 for most standard data acquisition systems that are designed to handle a differential voltage output 3 3 1 Excitation Voltage It is recommended that the Wheatstone bridge excitation voltage be at or below 10 Vdc since higher voltages can cause drift and stability issues due to ...

Страница 13: ... and reads the output in volts so the GGF must be adjusted to με Vout before applying the GGF in the results The current reading on the data acquisition system is 3 2312 x 10 3 Vdc Step 1 Convert GGF to με mVout 𝐺𝐺𝐹 504 32 𝜇𝜀 𝑚𝑉𝑜𝑢𝑡 𝑉 𝑒𝑥𝑐 5 𝑉 𝑒𝑥𝑐 1000 𝑚𝑉𝑜𝑢𝑡 𝑉𝑜𝑢𝑡 100 864 𝜇𝜀 𝑉𝑜𝑢𝑡 Step 2 Apply GGF to output voltage from data acquisition system 𝑅𝑒𝑎𝑑𝑖𝑛𝑔 𝑉𝑜𝑢𝑡 𝐺𝐺𝐹 3 2312 𝑥 10 3 𝑉𝑜𝑢𝑡 100 864 𝜇𝜀 𝑉𝑜𝑢𝑡 𝑅𝑒𝑎𝑑𝑖𝑛...

Страница 14: ... original position Also ensures that the responses correspond to typical structural testing positive for tension and negative for compression Run a test at a sample frequency higher than 30 Hz and apply a smooth tension force gently pulling on each end followed by a smooth compression force gently pushing each end The output returned should be a tension spike followed by a compression spike and sh...

Страница 15: ...several pitfalls that can be made while trying to evaluate accuracy In almost all cases we have seen the measurements have been proven to be correct but the assumptions made in the strain application system have been either incomplete or incorrect Remember that these accurate sensors have been designed to help obtain the structure s overall behavior since most evaluations are controlled by flexura...

Страница 16: ...ost every case we have seen a specimen that is supposedly undergoing tension only is actually bending as well A popular test is to use a dog bone with the ST350 mounted on one side and then the whole assembly put into tension It is almost impossible to get pure tension in this setup since the specimen may be slightly bent to begin with and straightens out slightly Also since the ST350 themselves h...

Страница 17: ...r users please contact us 4 INSTALLATION There are several alternative mounting methods that can be used depending on the orientation location material being mounted to steel concrete timber and the length of test hours weeks months years Due to the large number of variables associated with adhesive use thermal cycles UV exposure vibration impact moisture corrosion of base steel etc adhesive is re...

Страница 18: ...ate the ST350 longitudinally align these marks with the center of the ST350 feet Notice that the front of the ST350 end opposite of the cable has been machined to a slight point This point along with the cable exit on the rear of the ST350 should be aligned with the measurement axis line to ensure that strain is being measured parallel to the measurement axis An installed ST350 can be seen in Figu...

Страница 19: ... The following section outlines an installation for a steel surface Figure 8 Identifying Metric vs Imperial Tabs Place tabs in the machined slots of the ST350 Tab Jig and then place the ST350 on the positioned tabs as seen in Figure 9 Thread on the 1 4 20 or M6 nut and tighten to approximately 40 in lb INFORMATION BDI manufactures both Imperial 1 4 20 and metric M6 tabs To easily distinguish them ...

Страница 20: ...ine should be approximately 2 in 50 mm long This will allow the marks to be seen while the strain gage is being positioned Figure 10 Marking ST350 Center Mounting Location 2 Remove paint or scale from the area where the two lines intersect using a power grinder until a clean metal surface is obtained WARNING Be careful not to over tighten the nuts on the tabs over tightening may result in bending ...

Страница 21: ...e possibility of damaging sensors and tabs see Figure 11 Each TRT has a hex head machined into bottom face for tightening and or loosening the designated nut size and the small hole in the face of the hex head has been threaded to capture the threaded stud Figure 11 Tab Removal Tool TRT The following instructions describe the method used to remove a sensor that has been mounted to a steel surface ...

Страница 22: ...emoving a Tab with the TRT 4 Unthread the tab from the TRT and continue with the other sensors If the tab remained with the sensor during removal use vice grips to hold the foot of the tab while loosening the nut The tabs can be re used by soaking them in acetone for 30 40 minutes to remove the hardened adhesive Be sure to cover the container since the acetone will evaporate quickly and is very fl...

Страница 23: ...d air to clean any surface dust away from the mounting point 4 1 1 Concrete Mounting Studs If it is judged that the conditions warrant a more secure mounting system then threaded mounting studs can be used These will require holes to be accurately drilled 3 in 76 2 mm apart in the concrete with a hammer drill as described below Locate the first gaging point on the structure and using a concrete dr...

Страница 24: ...be short enough that the measured strains are not significantly affected by moment gradients and curvature An upper limit of 1 20 th the span length L will usually maintain the gradient below 5 In general it is desired to obtain as long a gage length as possible without exceeding the upper bound Table 5 provides the recommended lower and upper gage length limits for R C members Table 5 ST350 Exten...

Страница 25: ...900 psi 6 2 MPa xx ksi 6 9 MPa 7 5 ksi 51 7 MPa 5 15 in 381 0 mm 200 625 psi 4 3 MPa 720 psi 5 0 MPa 800 psi 5 5 MPa 6 0 ksi 41 4 MPa 6 18 in 457 2 mm 160 500 psi 3 4 MPa 575 psi 4 0 MPa 650 psi 4 5 MPa 4 8 ksi 33 1 MPa 7 21 in 533 4 mm 140 440 psi 3 0 MPa 500 psi 3 4 MPa 560 psi 3 9 MPa 4 2 ksi 29 0 MPa 8 24 in 609 6 mm 125 390 psi 2 7 MPa 450 psi 3 1 MPa 500 psi 3 4 MPa 3 8 ksi 26 2 MPa 4 1 3 At...

Страница 26: ...e that the gage is positioned correctly Figure 16 ST350 Extension Mounting Diagram INFORMATION In any of the above scenarios the steps outlined in the previous section should be used for surface preparation and mounting procedures The extension jig is used to ensure that the ST350 is aligned properly with the extension If using the anchor mounting on both ends omit the mounting tabs Using the ST35...

Страница 27: ...Figure 17 Aligning ST350 and Extension in the Jig Figure 18 Extension Alignment Tab Figure 19 Attaching Tab to Extension PRESS EXTENSION GENTLY TOWARDS ST350 TO SEAT THE EXTENSION PROPERLY against the ST350 DESIRED GAGE LENGTH STANDARD TAB EXTENSION ALIGNMENT TAB ...

Страница 28: ...t the glue line particularly if the concrete is slightly rough or not cleaned off properly Do not attempt to remove the extension from the ST350 while the assembly is still mounted to the structure Back off the securing nut between the ST350 and extension by holding the extension only If the tabs are still attached to the ST350 or extension after removal from the structure use vice grips to hold t...

Страница 29: ...ve carefully with a rag and very small amount of acetone 5 2 RECALIBRATION Calibration is performed on each ST350 and a unique Calibration Certificate is shipped with each sensor This certificate certifies that the sensor is traceable to NIST Standards If this sensor is out of specification or appears to be bent it can be sent to BDI straightening and re calibration We recommend that the ST350 is ...

Страница 30: ...P 1 303 494 3230 F 1 303 494 5027 740 S PIERCE AVE UNIT 15 LOUISVILLE CO 80027 BDITEST COM sales bditest com ...

Отзывы:

Нет отзывов