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Summary of Contents for TSI Instruments ALNOR EBT720
- Page 1 OWNER’S MANUAL Electronic Balancing Tool Models EBT720 and EBT721 EBT720-Z_ shown EBT721-Z_ shown...
- Page 2 LIMITATION OF WARRANTY AND LIABILITY Copyright© TSI Incorporated / March 2004 / All rights reserved. Address TSI Incorporated / Alnor Products / 500 Cardigan Road / Shoreview, MN 55126 / USA Fax No. (651) 490-3824 LIMITATION OF WARRANTY AND LIABILITY (effective July 2000) Seller warrants the goods sold hereunder, under normal use and service as described in the operator's manual, shall be free from defects in workmanship and material for twenty-four (24) months, or the length of time specified in the operator's manual, from the date of shipment to the customer.
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Page 3: Table Of Contents
CONTENTS About This Manual........................iii Formatting and Typography ....................iii Technical Assistance—Help! ....................iii Chapter 1. Introduction ......................1 Instrument Description ......................1 Micromanometer ....................... 2 Micromanometer ........................2 Standard Tools........................3 Pitot Tube.......................... 3 Static Pressure Probe ....................... 3 Optional Tools ......................... 3 Capture Hoods ........................ - Page 4 View/Set Standard Pressure and Temperature ..............21 Set Units of Measure for Temperature, Pressure, Velocity/Flow and Humidity ....23 Select the RS232 Output Device (Computer or Printer) ............23 Set the Baud Rate......................... 24 Set the Format for Date and Decimal..................24 Set Display Mode for Running Average or Single..............
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Page 5: About This Manual
About This Manual ® This manual explains how to set up, operate and maintain the Alnor Electronic Balancing Tools (EBT) Models EBT720 and EBT721. Read it thoroughly before using the instrument. Formatting and Typography Step-by-step instructions are numbered in boldface type: 1, 2, 3, etc., set flush-left against the margin. -
Page 7: Chapter 1. Introduction
Chapter 1. Introduction The Electronic Balancing Tools (EBT) Models EBT720 and EBT721 are lightweight and easy-to-use instruments packaged with a variety of accessories for measuring pressure, temperature, humidity, air velocity, and air volume. Features of the micromanometer include: Single-function keys for ease of use Auto-zero for pressure measurements, auto-density correction, and back-pressure compensation when used with a capture hood User-selectable English and metric units... -
Page 8: Micromanometer
Micromanometer Figures 1 and 2 show the features of the micromanometer used in the Models EBT720 and EBT721. Keypad Display Headphone Connection AC Adapter Connection Probe Connector RS232 Port For Future Use Figure 1: Features of the Alnor Models EBT720 and EBT721 Micromanometer, Front View Airflow Inlet/Outlet Battery... -
Page 9: Standard Tools
Standard Tools This section gives a brief description of standard tools for the micromanometer. Pitot Tube The pitot tube is primarily used to obtain air velocity, air volume, and velocity pressure measurements within ductwork. Static Pressure Probe The static pressure probe is primarily used to obtain static pressure measurements within ductwork. Optional Tools This section gives a brief description of optional tools for the micromanometer. -
Page 11: Chapter 2. Unpacking And Setting Up
Chapter 2. Unpacking and Setting Up This chapter describes unpacking and setting up (preparing) the Electronic Balancing Tool (EBT) for use. Figure 3 shows a picture of the Model EBT720 with a velocity matrix measuring the face velocity on a laboratory hood. -
Page 12: Preparing The Instrument For Use
Item Part No. AC Adapter (USA) 8710-USA AC Adapter (EU) 8710-EUA AC Adapter (UK) 8710-UKA AC Adapter (AU) 8710-AUA Table 2: List of Optional Hood Components Item Part No. 1 ft × 4 ft (305 mm × 1220 mm) and 2 ft × 4 ft (610 mm × 1220 mm) fabric hood 801094 and frame kit 1 ft ×... - Page 13 Figure 4: Battery Cover Removal Press down on the compartment cover and slide it down. (The cover slides off.) Remove the battery holder by pulling up on the bottom (to loosen it) and then pulling the battery holder free. Refer to Figure 5 and set the battery selection switch to indicate the type of batteries you are using. Battery Selection Switch Figure 5: Location of Battery Type Selector Switch Reinstall the battery holder and replace the battery compartment cover.
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Page 14: Connecting The Pitot Tube To The Micromanometer
Remove the old batteries and replace with fresh batteries (alkaline or rechargeable NiMH). Make certain batteries are correctly oriented. Verify the battery selection switch is correctly set (see Figure 5). Reinstall the battery holder and replace the compartment cover. Note: Make sure the battery holder is oriented so that it’s terminals make contact with the spring contacts in the battery compartment. -
Page 15: Attaching The Micromanometer To The Capture Hood Base
Magnet Static Pressure Port Figure 7: Static Pressure Probe Attaching the Micromanometer to the Capture Hood Base 1. Tilt the meter forward and align the tabs in the base of the meter with the two matching slots in the bottom of the recessed area at the front of the base (Figure 8). 2. -
Page 16: Connecting The Air Flow Probe To The Micromanometer
The handle assembly is attached to the downstream or negative (-) side in the center of the velocity matrix (see Figure 9). Standoffs Positive Port (+) Negative Port (–) Handle Figure 9: Velocity Matrix Connecting the Air Flow Probe to the Micromanometer The static pressure port (-) on the Air Flow Probe will be connected to the negative pressure (-) port on the micromanometer, and the total pressure port (+) on the Air Flow Probe will be connected to the positive (+) port on the micromanometer (see Figure 10). - Page 17 Match key on plug to detent on receptacle Figure 11: Connector for the Temperature Probe or Temperature/Humidity Probe Chapter 2: Unpacking and Setting Up...
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Page 19: Chapter 3. Getting Started
Chapter 3. Getting Started This section provides information to help you quickly become familiar with the Models EBT720 and EBT721 Micromanometer functions. It also includes step-by-step instructions for taking Sample readings. Keypad Operation The keypad lets you enter information, initiate functions, and change values stored in the micromanometer. -
Page 20: Common Terms
The ON/OFF key is used to turn the micromanometer on or off. The BACKLIGHT key turns the display’s backlighting on and off. Use backlighting only when working in areas where you cannot read the display with existing light. Backlighting has a significant impact on battery life. -
Page 21: Step-By-Step Example Operation
Step-By-Step Example Operation The quickest way to become acquainted with the operation of the Electronic Balancing Tool is to take a few Samples while in the pressure mode. To take Samples proceed as follows: 1. Connect the AC adapter to the micromanometer or install batteries in the micromanometer (see Chapter 2). -
Page 23: Chapter 4. How To
Chapter 4. How To This chapter explains how to perform a variety of operations: Select a Tool/Probe Set the Date and Time Change the current Test ID Recall Sample Data Delete Sample Data Delete All Sample Data Select/Set a K-factor View/Set Standard Pressure and Temperature Set Units of Measure for Temperature, Pressure, Flow and Humidity Select the RS232C Output Device (Computer or Printer) - Page 24 Table 3: Tool Selection Display Display Shows Tool Units Available Pressure units only Pressure in H O, mm H O, cm H O, Pa, hPa, kPa, mm Hg, cm Hg, in Hg, Capture Hood l/s, m /hr, m /min, CFM with flow units Pressure units with K- Diffuser Flow...
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Page 25: Set The Time And Date
Set the Time and Date 1. Press to display CHANGE Test ID. 2. Press until SETUP appears. 3. Press until TIME is displayed. 4. Press 5. Press . The display shows the current time and date. The hours value is flashing. 6. -
Page 26: Delete Sample Data
Delete Sample Data You can delete data in three ways: 1) delete all Sample data in all Test IDs, 2) delete all Sample data for a single Test ID, and 3) delete only the last Sample currently stored in a Test ID. Delete all Sample Data 1. -
Page 27: Select/Set A K-Factor For A Tool
Select/Set a K-factor for a Tool It is possible to enter K-Factors to adjust the calculations of the velocity and flow measurements. For Hood Flow, Pitot Velocity, Pitot Flow, Air Flow Probe Flow, Air Flow Probe Velocity and Velocity Matrix, the K-Factor is simply multiplied by the calculated velocity or flow in order to get the displayed value. - Page 28 To display the Barometric Pressure: to display CHANGE Test ID. 1. Press until STP.SET appears. 2. Press 3. Press . ACT.STD is displayed. 4. Press until B.PRESS appears. The measured barometric pressure is displayed. Barometric pressure is not changeable by the user. 5.
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Page 29: Set Units Of Measure For Temperature, Pressure, Velocity/Flow And Humidity
Set Units of Measure for Temperature, Pressure, Velocity/Flow and Humidity to display CHANGE Test ID. 1. Press until SETUP appears. 2. Press 3. Press 4. Press until UNITS appears. . The display shows TEMP. 5. Press 6. Press . The display shows the current temperature units. Options are °F or °C. 7. -
Page 30: Set The Baud Rate
6. Press to change device. . COM.DEV is displayed. 7. Press 8. Press ESC to return to SETUP. Set the Baud Rate Before transferring data to a computer or printer, you must set the baud rate to the speed at which your printer or computer will accept information. -
Page 31: Set Display Mode For Running Average Or Single
Set Display Mode for Running Average or Single If Single is selected, the instrument will show READY on its display, and will not start taking readings until READ is pressed. If Running Average is selected, the instrument will constantly measure and display a running average. The READ button can then be used to stop and start the running average. -
Page 32: Turn Back Pressure Compensation On And Off
Turn Back Pressure Compensation On and Off Back pressure caused by flow through the capture hood can lower the flow being measured, causing measurement error. If it is desired to minimize this error, turn the back pressure compensation on. 1. Press to display CHANGE Test ID. -
Page 33: Select User Calibration Or Factory Calibration
until CALIB appears. 2. Press . The display shows CALIB plus which measurement is selected for calibration. 3. Press 4. Press until the desired measurement to calibrate is shown. 5. Press . The display shows SPAN and the requested calibration condition is shown on the bottom left. -
Page 34: Connect And Download Data To A Computer
prints question marks (??????), asterisks (******), or random characters, reset it by turning it off and then on again. Figure 12 illustrates the printout information for a single sample. --------------------------- MODEL: EBT721 SERIAL: 0404004 --------------------------- TEST ID: Sample: 02/16/04 15:14:31 1.00 CFM Shape=Round Dia =... -
Page 35: Data Acquisition (Polling)
software, run the SETUP.EXE file on the CompuDat distribution disc. Once you open the program, it is self-directing and provides all the necessary instructions for downloading data. Data Acquisition (Polling) The micromanometer is designed to allow the user to perform polling through the use of a computer. The computer must send an upper case ‘V’... -
Page 37: Chapter 5. Changing Flow Hoods
Chapter 5. Changing Flow Hoods This chapter identifies the flow hood parts and gives instructions for assembling the flow hood. Flow Hood Parts Identification Figure 13 identifies the major parts of the capture hood, which are described in the following paragraphs. Before using the hood, please familiarize yourself with the various parts. -
Page 38: Alternate Hood Installation
Figure 14: Installing a Support Pole 4. Insert the second support pole into the pole mount on the opposite side of the base. 5. Repeat step 3 for the second support pole. 6. Repeat steps 4 and 5 for the remaining two support poles. Four other hood sizes are available from TSI and can be purchased separately. - Page 39 Figure 15: 1 ft × 4 ft (305 mm x 1220 mm) Frame Figure 16: 2 ft × 4 ft (610 mm x 1220 mm) Frame The number 1 and 5 channels also have a wing nut at the straight end which will mate with an angle and studs on the ends of numbers 2, 5 and 6 to form the longer frame sides (see Figure 20).
- Page 40 Figure 19: Frame Corner Assembly Figure 20: Frame Side Coupler Assembly Each hood is constructed in a trapezoidal shape, sewn together so that one open end forms a round attachment to the base, and the other forms a square or rectangle large enough to fit its matching frame assembly.
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Page 41: Chapter 6. Flow Measurements Using The Capture Hood
Chapter 6. Flow Measurements Using the Capture Hood There are two methods of making flow measurements using the capture hood: Non-Backpressure Compensated and Backpressure Compensated methods (see “Appendix A. Back Pressure,” for an explanation of the implications of capture hood-induced back pressure on the measured flow). Flows in both “Supply”... -
Page 42: Backpressure Compensated Measurements
Backpressure Compensated Measurements In most cases, backpressure compensated measurements will provide the most satisfactory flow measurement results. In order to prepare for backpressure compensated measurements, be sure the Back Pressure Compensation function is turned “ON” (see “Turn Back Pressure Compensation On and Off” in Chapter 4). -
Page 43: Chapter 7. Maintenance And Troubleshooting
Chapter 7. Maintenance and Troubleshooting The Electronic Balancing Tool (EBT) Models EBT720 and EBT721 are designed for long-term field use. If used with reasonable care, it should be able to make precise measurements over a long time period. Some of the components can be cleaned periodically. When cleaning the components, please follow the instructions given below. -
Page 44: Calibration
Calibration TSI recommends an annual calibration for the instrument. For a nominal fee, we will calibrate the unit and return it to you with a certificate of calibration and NIST traceability. This “annual checkup” assures you of consistently accurate readings. To calibrate the instrument, please ship the complete package that includes the meter, the base, the manifold and any fabrics used. -
Page 45: Error Code
Table 6: Error Codes Error Code Possible Causes Corrective Action The AC adapter voltage is too low. Use correct AC adapter. The NiMH batteries will not recharge fully with low AC adapter voltage. The AC adapter voltage is too high. Use correct AC adapter. - Page 46 Error Code Possible Causes Corrective Action Flap closed pressure was < flap open Take data again. pressure, or flap open versus flap closed pressure ratio exceeds allowed limits. There was an error reading the AD7708 A Return to factory if error re-occurs. to D converter.
- Page 47 Error Code Possible Causes Corrective Action Pressure sensor gain factor C out of range. Perform user calibration or return to factory. Pressure sensor divider calibration out of Return to factory. range. A to D reference voltage out of range. Return to factory. 5V reference voltage out of range.
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Page 49: Appendix A. Back Pressure
Appendix A. Back Pressure The quantity of air flowing through a supply diffuser or a return grille is reduced to some extent whenever a capture hood is placed over the flow opening. The amount of flow reduction will vary depending on the combined effects of the diffuser/grille resistance, the capture hood resistance, and the flow rate. -
Page 51: Appendix B. Actual Vs. Standard Air Velocity And Flow Measurements
Appendix B. Actual vs. Standard Air Velocity and Flow Measurements Actual Air Velocity is also known as the “local” air velocity. It can be thought of as the speed of a microscopic dust particle being carried along in the air stream. Actual Air Velocity is measured with a Pitot tube using the basic formula: ×... - Page 52 Thus, to convert from Actual Velocity to Standard Velocity, use the following equation: ρ × Eq. (5) ρ Substituting known values into Eq. (5), we get: × × × × Eq (6) where: P is the local atmospheric pressure, as measured by the EBT, for example, in units of (in.
- Page 53 Models EBT720 AND EBT721 Specifications Range Units Differential pressure... Pressure ....±15 in. H O (3735 pa); 150 in. in. H O, pa, mm Hg, in. Hg, O maximum safe operating cm Hg, mm H O, cm H pressure Velocity ...... ft/min, m/s Absolute pressure..
- Page 54 TSI Incorporated 500 Cardigan Road Shoreview, MN 55126 USA Toll Free (800) 861-7897 Telephone (651) 490-2707 March 2004 Fax (651) 490-3824 Printed in USA www.alnor.com Part No. 1980497 Rev. A © Copyright 2004 TSI Incorporated customerservice@alnor.com...
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