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Related Manuals for Shortridge Instruments Airdata ADM-870
Summary of Contents for Shortridge Instruments Airdata ADM-870
- Page 1 AIRDATA MULTIMETER ADM-870 ™ ELECTRONIC MICROMANOMETER AIR FLOW • VELOCITY • PRESSURE • TEMPERATURE OPERATING INSTRUCTIONS Shortridge Instruments, Inc. 7855 East Redfield Road / Scottsdale, Arizona 85260-3430 Phone (480) 991-6744 • Fax (480) 443-1267 ® www.shortridge.com ADM-870 05/23/08...
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Page 2: Table Of Contents
CONTENTS 1.0 INTRODUCTION 2.0 SPECIFICATIONS 3.0 EXTERNAL FEATURES 3.1 KEYPAD 3.2 FEATURES ON SIDES AND BACK OF METER 4.0 DISPLAY MESSAGES AND PROMPTS 4.1 READ PROMPTS 4.2 MEASUREMENT READOUTS 4.3 FUNCTION READOUTS 5.0 USING THE AIRDATA MULTIMETER 5.1 AUTOMATIC READINGS 5.2 MEMORY/AVERAGE/TOTAL FUNCTION 5.2.1 MEMORY OPERATION 5.2.2 RECALL... - Page 3 APPENDIX C - BATTERY TEST PROCEDURE REPLACEMENT PARTS LIST ADM-870 INDEX Copyright © Shortridge Instruments, Inc., 2008. All rights reserved. This information may not be reproduced or duplicated in any manner, or for any purpose, without permission in writing from Shortridge Instruments, Inc.
- Page 4 ILLUSTRATIONS 3.1 ADM-870 METER FRONT AND BACK 6.1 PITOT TUBE 6.2 AIRFOIL PROBE 6.4 VELGRID ASSEMBLY 7.1 STATIC PRESSURE PROBE 8.1 ADT442 TEMPROBE 8.2 AIRDATA MULTITEMP 10.1 FRAME STORAGE 10.2 FLOWHOOD IN CASE 10.3 FLOWHOOD ASSEMBLY 10.4 2X2 FRAME ASSEMBLY 10.5 1X4 FRAME ASSEMBLY 10.6 2X4 FRAME ASSEMBLY 10.7 1X5 FRAME ASSEMBLY...
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Page 5: Introduction
1.0 INTRODUCTION You will find these instructions much easier to follow if you have the meter in front of you as you read through them. You can note the various connections and press the keys, observing the displayed results as you read through the various procedures. -
Page 6: Specifications
The measurement range is 25 to 29,000 fpm with a pitot tube, and 25 to 5,000 fpm with the Shortridge Instruments, Inc. AirFoil probe. The measurement range using the VelGrid is 25 to 2500 fpm. Accuracy is ± 3% of reading ± 7 fpm from 50 to 8000 fpm. Pitot tube velocity readings from 8,000 fpm to 29,000 fpm are based on compressible isentropic flow theory and are not certified NIST traceable. - Page 7 AIR BLEED: Each pressure measurement allows a small volume of air to pass through the meter. The pressure source must be capable of supplying this volume without significant depletion to assure accurate measurements. Bleedthrough (typ) 0.0004 cu in/in wc/measurement. Quiescent bleedthrough (max) 0.0005 cu in/in wc/minute.
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Page 8: External Features
3.0 EXTERNAL FEATURES 3.1 KEYPAD The meter keypad has eight keys. Each key may include multiple functions that may be activated, either alternately, or by pressing the shift key followed by the function key. The instructions will often refer to a key by only one of the functions shown on the key. - Page 9 TemProbe sensor must be connected to this receptacle whenever temperature density correction is desired for either flow or velocity measurements. A retractile cord connects the TemProbe or the MultiTemp to the temperature input jack for remote temperature sensing. OFF/RESET SWITCH The off/reset pushbutton switch is on the back of the meter in a recess near the upper left corner.
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Page 10: Adm-870 Meter Front And Back
External Read Jack for 8 Digit, 0.5" LCD Display Pushbutton Handle Plug SHIFT Activates Upper Half of Keys Battery Charger Jack DENS Local Density/Standard Density MODE Flow/Pres/Temp/VLG/AFP/Pitot/Abs UNITS English/Metric ASSOC Associated Pressure & Temperature CLEAR Clear for Memory and Speed-Read STORE Memory/Average/Total AUTO... -
Page 11: Display Messages And Prompts
4.0 DISPLAY MESSAGES AND PROMPTS 4.1 READ PROMPTS The following ten prompts all include the term READ, which is a signal for the operator to press the READ key to trigger the actual measurement. English Units CF: READ This display indicates that the meter has been placed in the air flow function (cfm) and will appear automatically upon power up if the flaps plug of the FlowHood is connected to the meter. -
Page 12: Function Readouts
IN: ± nnnnn Indicates that the result represents a differential pressure measurement (in wc). Metric Units BAR n.nnn Indicates that the result represents an absolute pressure measurement (bar). (One bar = 100 kPa). C: ± nnn.n Indicates that the displayed result represents a temperature measurement ( ±... - Page 13 CF: UNCORR This message indicates that the air flow measurement being performed will not be backpressure compensated. CLEAR This signal is flashed as the memory, auto, or SPEED-READ function is cleared. DIF PRES This signal will be flashed when the differential pressure mode is selected, and also upon each subsequent operation of the READ key.
- Page 14 a temperature measurement. This term is also displayed if the TemProbe or extension cord has been damaged so as to create an open circuit. OPEN FLAP This message advises that the operator has attempted to perform a nonbackpressure compensated air flow measurement at greater than 500 cfm with the flaps closed.
- Page 15 VELGRID This signal will be flashed when the VelGrid mode is selected, and also upon each subsequent operation of the READ key. ADM-870 05/23/08...
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Page 16: Using The Airdata Multimeter
5.0 USING THE AIRDATA MULTIMETER The meter is automatically set to read in English units and local density. The SHIFT key must be pressed, followed by the desired units or density key, to shift the meter into either the metric units function, the standard density function, or both. -
Page 17: Recall
If the meter's full capacity of 100 readings has been reached, STOR FULL will be displayed. Press the STORE key to alternately display the average and sum, or one of the RCL keys for recall of the individual readings. The memory must be cleared before a new reading sequence begins. -
Page 18: Speed-Read Operation
FlowHood, and very low readings of building or room air pressures. The first reading taken after moving a sensor is not valid when using SPEED-READ and must not be relied upon. At least two or three more readings would have to be taken to assure a stable readout. It is faster to take individually triggered readings whenever the process requires changing positions. -
Page 19: Velocity Measurement
6.0 VELOCITY MEASUREMENT Air velocity measurements obtained with the AirData Multimeter are automatically corrected for the density effect of barometric pressure. The TemProbe must be used to obtain readings corrected for the density effect of temperature. If the TemProbe has not been connected to the meter, STD 70 F will be flashed during the calculation time, and all data will be processed using the standard temperature of 70 An optional temperature value associated with the previous velocity measurement (associated temperature) may... -
Page 20: Pitot Tube Velocity Measurement
Calculate the effective average face velocity (fpm) by dividing the actual air flow measured in Step #2 (cfm) by the gross active face area (sq ft) calculated in Step #1. Measure the average face velocity at the AMD using the VelGrid, AirFoil probe or other velocity instrument being tested for a Kv. -
Page 21: Airfoil Probe
6.1 PITOT TUBE NEGPITOT will be displayed if the pitot tube readings are negative. This will occur if the positive (+) and negative (-) hoses have been incorrectly connected to the inlet ports of the meter; if the pitot tube has been improperly positioned in the air stream;... -
Page 22: Duct Velocity Using Airfoil Probe
and the TemProbe into 3/8" holes drilled into the side of the duct, being careful to align the AirFoil tip as discussed above. Press the READ key to obtain the air velocity measurement. As soon as the display reads CALC, the AirFoil probe may be moved to another position. 6.2 AIRFOIL PROBE NOTE: The AirFoil probe readings will be displayed with a negative sign if the hoses are connected backwards to the meter or to the probe. -
Page 23: Exhaust Hoods - Airfoil Probe
6.3.3 EXHAUST HOODS - AIRFOIL PROBE The AirFoil probe provides single point air velocity samples and may be used to collect data for graphing face velocity profiles at exhaust hoods. Air flow at the extremely low velocities (50 to 150 fpm) used in chemical exhaust hoods and safety cabinets will show significant percentage variability at any given point (slight fluctuations in velocity represent a very large percentage fluctuation at low velocities). -
Page 24: Chemical Exhaust Hoods - Velgrid
6.4.1 CHEMICAL EXHAUST HOODS - VELGRID The VelGrid provides the average of 16 measurement points at 3.5 inch centers, and represents a 14"x 14" area for each reading. When using the VelGrid for chemical exhaust hood readings, the sash opening must be set at a minimum opening of 14 inches in width for horizontal sliding sash, or 14 inches in height for vertically adjustable sash. -
Page 25: Velgrid Assembly
6.4 VELGRID ASSEMBLY ADM-870 05/23/08... -
Page 26: Velocity: Local Density Vs Standard Density (Mass Flow)
6.5 VELOCITY: LOCAL DENSITY VS STANDARD DENSITY (MASS FLOW) The AirData Multimeter measures true air velocity past the sensor at a given time, when used in the local density mode. This is in contrast to thermal anemometers or "hot wire" instruments which measure mass flow (mass flux/unit time). -
Page 27: Pressure Measurement
7.0 PRESSURE MEASUREMENT 7.1 DIFFERENTIAL PRESSURE Differential pressure measurements can be made with static pressure probes, pitot tubes, or by connecting the pneumatic tubing directly to any appropriate pressure source within the safe operating limits for the meter. The manner in which a pitot tube is connected to the meter is critical to the type of differential pressure measurement being made. -
Page 28: Pitot Tube "Total Pressures
discussed under VELOCITY PRESSURES above. The resulting pressure differential is recorded as static pressure. 7.1.4 PITOT TUBE "TOTAL PRESSURES" Total pressure measurements may be obtained using the pitot tube and the differential pressure mode by connecting the positive (+) port on the meter to the total pressure connection (in line with the main shaft) of the pitot tube and leaving the negative (-) port exposed to the ambient pressure. -
Page 29: Temperature Measurement
8.0 TEMPERATURE MEASUREMENT 8.1 TEMPROBE The TemProbe temperature probe is used for temperature measurements. The TemProbe may be plugged directly into the temperature input jack on the back of the meter. Since this receptacle is keyed, the plug of the TemProbe sensor must be correctly aligned for proper insertion. -
Page 30: Airdata Multitemp
each of the switch positions. Careful recording of which switch position readings are entered into memory under which sequence tag is essential to accurate recall of readings for performance calculations. FIGURE 8.2 AIRDATA MULTITEMP Additional points may be measured in the same measurement sequence by using more than one MultiTemp switch unit connected in series (piggybacking). -
Page 31: Air Flow Measurement
9.0 AIR FLOW MEASUREMENT 9.1 FLOWHOOD FUNCTION The AirData Multimeter uses the Series 8400 FlowHood Kit for backpressure compensated measurement of air flow. The FlowHood unit captures and directs the air flow from an outlet, or inlet, across the highly sensitive flow sensing manifold within the FlowHood base. -
Page 32: Flowhood Assembly
10.0 FLOWHOOD ASSEMBLY 10.1 UNPACKING The FlowHood case has been specifically designed for the most efficient storage and handling of the FlowHood unit and its accessories. Note the arrangement of the various items as you unpack the unit. Especially note the placement of the foam cushioning around the instrument, and the orientation of the meter face toward the side of the case. -
Page 33: Handle
The dowel end pins are inserted into the outer set of frame support cups when assembling a 1'x4' top and into the inner set when assembling a 2'x4' top as shown in Figures 10.5 and 10.6. The 1'x5' top requires an 8.5" dowel extender at the bottom of each support dowel. -
Page 34: Frame Storage
FIGURE 10.1 FRAME STORAGE FIGURE 10.2 FLOWHOOD IN CASE ADM-870 05/23/08... -
Page 35: Flowhood Assembly
FIGURE 10.3 FLOWHOOD ASSEMBLY ADM-870 05/23/08... -
Page 36: 2X2 Frame Assembly
FIGURE 10.4 2X2 FRAME ASSEMBLY FIGURE 10.5 1X4 FRAME ASSEMBLY FIGURE 10.6 2X4 FRAME ASSEMBLY ADM-870 05/23/08... -
Page 37: 1X5 Frame Assembly
FIGURE 10.7 1X5 FRAME ASSEMBLY FIGURE 10.8 3X3 FRAME ASSEMBLY ADM-870 05/23/08... -
Page 38: Flowhood Operating Procedure
11.0 FLOWHOOD OPERATING PROCEDURE The meter handle should be removed from the AirData Multimeter by unscrewing the captive fasteners on the sides. The meter is inserted into the recess in the FlowHood base, using the captive fastener inside the base to secure it. -
Page 39: Error
Backpressure compensation requires two readings in immediate sequence. The first reading is the flaps open reading discussed above. The second reading is done with the flaps closed. The meter automatically determines the required backpressure compensation calculated from the relationship between the two readings and displays the compensated result. -
Page 40: Special Balancing Procedures
12.0 SPECIAL BALANCING PROCEDURES 12.1 PROPORTIONAL BALANCING Backpressure compensated readings should be taken during the preliminary survey of the entire system with all dampers fully open, and also during the final readings after balancing is complete. Nonbackpressure compensated readings require less time and are usually adequate for the proportional balancing of outlets (see Section 5.4 SPEED-READ). -
Page 41: Linear Slot Diffusers
12.5 LINEAR SLOT DIFFUSERS Linear slot diffusers deliver supply air in a sheet or air curtain that tends to follow the side of the cloth transition as it flows to the FlowHood base. This can result in an extremely uneven velocity distribution across the flow sensing grid when the flaps are open. -
Page 42: Correction Factors And Conversion Formulas
13.0 CORRECTION FACTORS AND CONVERSION FORMULAS 13.1 BAROMETRIC PRESSURE DENSITY CORRECTION - LOCAL DENSITY The ADM-870 AirData Multimeter automatically corrects air flow and velocity readings to represent local or standard density cfm or fpm as affected by barometric pressure. 13.2 TEMPERATURE DENSITY CORRECTION Air flow and velocity readings are density corrected for the effect of temperature if the TemProbe temperature sensor is used during flow or velocity measurements. - Page 43 mass flow, "velocity" readings at density conditions other than standard must be corrected for local air density conditions if these results are to represent true air velocity. Local density velocity readings taken with the ADM-870 AirData Multimeter may be compared with hot wire anemometer readings if the hot wire readings are corrected for local air density conditions to obtain true air velocity results.
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Page 44: Meter Accuracy Field Testing
14.0 METER ACCURACY FIELD TESTING 14.1 METER ZERO FUNCTION Take several readings with the meter set for air flow or velocity, with no air passing through the FlowHood unit. The meter should display zero readings, but may occasionally show a low reading such as 25 cfm. An occasional positive or negative reading is random electronic "noise"... -
Page 45: Duct Traverse Using The Airdata Multimeter
Where: = local barometric pressure (in Hg) F = temperature of measured air stream If the TemProbe is not attached during the flow measurement, the FlowHood meter will assume standard 70 F conditions (as do the inclined manometer and the standard micromanometer). In this case, it is not necessary to correct the duct traverse velocity for the density effect due to temperature. -
Page 46: Meter & Flowhood Maintenance
15.0 METER & FLOWHOOD MAINTENANCE 15.1 METER MAINTENANCE The AirData Multimeter is a precision instrument designed for long term field use if given reasonable care and maintenance. The meter and accessories should be kept reasonably clean, and should be stored in the protective case when not in use. -
Page 47: Recalibration And Repair Information
Do not use spray foam. Spray foam can damage the meter, and it is possible to “lose” a meter in a chunk of spray foam. Ship directly to: Shortridge Instruments, Inc. 7855 E. Redfield Rd. Scottsdale, Arizona 85260 Attention: Recalibration and Repair Dept. -
Page 48: Warranty
Shortridge Instruments, Inc. reserves the right to make changes at any time, without notice, in prices, colors, materials, specifications and models, and also to discontinue models. -
Page 49: Appendix A - Nist Velocity Testing
APPENDIX A - NIST VELOCITY TESTING The AirData Multimeter is primarily an electronic micromanometer which measures pressures very accurately. The velocity pressure generated by the various probes is used to calculate and display air velocity and air flow. Confirmation of the meter pressure measurement accuracy is fairly simple using NIST traceable transfer standard gages. -
Page 50: Appendix B - Laboratory Differential Pressure Test
Calibration services and documentation is available at Shortridge Instruments, Inc. However, if interim calibration tests are required at your own metrology department or at an independent laboratory, the following information will be helpful. -
Page 51: Appendix C - Battery Test Procedure
APPENDIX C - BATTERY TEST PROCEDURE Insufficient battery charge (entire set or individual cells) can cause the meter to display garbled messages or "TOO HOT", "TOO COLD", "RECHARGE" or other messages. This garbled display usually is seen when the meter is just turned on and the supply voltage drops so fast that the meter gets lost. The following tests should be performed before you call or return the meter. - Page 52 Please call 1-800-822-8837 for information on Ni-Cd battery recycling and disposal bans/restrictions in your area. Shortridge Instruments, Inc. involvement in this program is part of our commitment to preserving our environment and conserving our natural resources.
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Page 53: Replacement Parts List
REPLACEMENT PARTS LIST Part no No reqd per set Description ADM-870M AirData Multimeter PS8201 Battery charger AA-NICAD Rechargeable Ni-Cd batteries ADT442 TemProbe temperature probe - 4" x 1/8" diameter TRC16 Temperature retractile cord - 1'x 6' TEW19 Temperature extension wand 19" A-303 Static pressure tip 160-18... - Page 54 REPLACEMENT PARTS LIST (continued) Part no No required per set Description 1' x 5' TOP (33 x 152.4 cm) Side channel (type 1) Side channel (type 2) End channel (type 3) Side extender (type 5) 1x5F Complete frame assembly (all of above) 1x5S Cloth skirt (13"...
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Page 55: Adm-870 Index
ADM-870 INDEX 8.8:8.8.8.8.8.8 default air density correction DENS AABC density correction 22, 38, 39 ABS PRES density effect absolute pressure 2, 24, 40 density effects active face area dewpoint Air Balance Manuals DIF PRES 9, 12, 23 air bleed differential pressure 2, 23 air density correction 2, 18, 22, 24... - Page 56 LOCHARGE reset switch lockout response time LS: CORR safety cabinets LS: READ LS: UNCORR safety notice LS:c ± nnnn sea level conditions LS:u ± nnnn Sheet Metal and Air Conditioning Contractors SHIFT 4, 10, 13 mass flow 22, 38 short top set sidewall registers memory 2, 13...
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