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Alnor 9870 Owner's Manual

Air velocity meter
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OWNER'S MANUAL
Model 9870
Air Velocity Meter

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Summary of Contents for Alnor 9870

  • Page 1 OWNER’S MANUAL Model 9870 Air Velocity Meter...
  • Page 2 LIMITATION OF WARRANTY AND LIABILITY 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 (24) months, or the length of time specified in the operator's manual, from the date of shipment to the customer.

  • Page 3: Table Of Contents

    Table of Contents CHAPTER 1 Setup ..........3 Unpacking ............3 Installing the batteries ........3 CHAPTER 2 Operation.......... 4 Extending the probe .......... 4 Measuring temperature........5 Measuring velocity..........6 Switching on the power........6 Selecting temperature/velocity display....7 Selecting the sensor response ......

  • Page 5: Chapter 1 Setup

    CHAPTER 1 Setup This chapter guides you through unpacking and installing batteries into your Model 9870. See Chapter 2 for a detailed description of the digital meter's operating functions. Unpacking Carefully unpack the instrument and accessories from the shipping container. Check the individual parts against the list of components in Table 1;...

  • Page 6: Chapter 2 Operation

    This chapter thoroughly explains how to operate the meter Extending the probe The Model 9870 contains a telescoping velocity and temperature measuring probe which is shipped in its collapsed position. To expose the probe to the flow for air velocity or temperature measurements, grasp the tip of the probe and pull firmly.

  • Page 7: Measuring Temperature

    Always store the probe in its retracted position when not in use, in order to protect the sensor. NOTE: As you handle the probe, take care not to bump it against duct walls or other objects. The probe has been made as rugged as possible, but it can be damaged by careless handling.

  • Page 8: Measuring Velocity

    Therefore, when you plan to measure both temperature and velocity, it is best to measure temperature first. Switching on the power Turn on the Model 9870 using the ON/OFF switch. It will display battery life for the first 5 seconds.

  • Page 9: Selecting Temperature/Velocity Display

    VEL position to read the current velocity. Selecting the sensor response The Model 9870 has a FAST/SLOW response switch for setting the sensor response speed. In the slow response mode, it displays the average velocity measured during the past 12 seconds.

  • Page 10: Batteries

    3 readings or all 12 readings will be averaged for display. Batteries The Model 9870 is powered by four AA-size batteries. TSI ships the instrument with alkaline batteries, but nickel-cadmium rechargeable batteries may be used. Keep in mind that battery life is a function of the velocity being measured: the higher the velocity, the shorter the life.
  • Page 11 The meter continually monitors its battery supply voltage. When the battery life falls below 15%, the battery indicator (BAT) in the upper left corner of the display will blink on and off. This indicates a low battery condition and means that the batteries will soon need to be replaced.

  • Page 12: Chapter 3 Maintenance

    CHAPTER 3 Maintenance The Model 9870 requires very little maintenance to keep it performing well. Probe tip Periodically inspect the probe tip to ensure that it is clean. Dust and oil deposits on the tip and sensor decrease the accuracy of the meter.

  • Page 13: Cases

    Cases If the instrument case or storage case needs cleaning, wipe it off with a soft cloth and isopropyl alcohol or a mild detergent. Never submerge the meter. Storage When storing the meter for more than a month, it is recommended that you remove the batteries to prevent damage due to leaking batteries.

  • Page 14: Chapter 4 Troubleshooting

    CHAPTER 4 Troubleshooting Table 3 lists the symptoms, possible causes, and recommended solutions for common problems encountered with the meter. If your symptom is not listed, or none of the solutions solve your problem, please contact TSI. Table 3: Troubleshooting the meter Possible Corrective Symptom...
  • Page 15 Possible Corrective Symptom Causes Actions Velocity The flow is Reposition the reading fluctuating probe in a less fluctuates turbulent section badly of the flow or set the RESPONSE switch to SLOW Velocity The velocity Use an alternate reading blinks exceeds 4000 method to 4000 fpm or fpm or 20.32...

  • Page 16: Appendix A Standard Velocity Vs. Actual Velocity

    Since thermal sensors are sensitive to changes in air density and air velocity, all thermal anemometers indicate velocities with reference to a set of standard conditions. For Alnor instruments, standard conditions are defined as 70°F (21.1°C) and 14.7 psia (101.4 kPa). Other manufacturers may use different values.
  • Page 17 velocity readings (as indicated by the meter) by the following density correction factor: 14 7 .   Act Vel Std Vel     460 70 Where T = Ambient temperature in °F P = Ambient pressure in psia If you use metric units, the equation becomes: 1014 ...
  • Page 18 Example No. 1 You want to measure the actual velocity in a duct. The air temperature in the duct is 55°F and the pressure is 14.24 psia. You take a measurement and the display reads 1200 fpm. 460 + 55 14 7 ...

  • Page 19: Appendix B Specifications

    APPENDIX B Specifications Specifications are subject to change without notice. Specifications in parentheses () indicate metric equivalents. VELOCITY: Range: 0 to 4,000 fpm (0 to 20.00 m/s) Accuracy ±5.0% of reading or ±5 fpm (±0.025 m/s) whichever is greater TEMPERATURE: Range: 0 to 200°F (-18 to 93°C) Resolution:...
  • Page 20 TIME CONSTANT: Fast mode: 3-second averaging Slow mode: 12-second averaging POWER REQUIREMENTS: four (4) AA-size batteries, nickel cadmium or alkaline (provided) BATTERY LIFE: Minimum 10 hours at 100 fpm (0.5 m/s) using alkaline batteries STANDARD EQUIPMENT: Free certificate of NIST* traceability, operation and service manual, four AA-size alkaline batteries and hard-shell carrying case.
  • Page 21 TSI Incorporated Alnor Products 500 Cardigan Road Shoreview, MN 55126 USA October 2002 Toll Free (800) 424-7427 Printed in USA Telephone (651) 490-2811 Part No. 116-159-870, rev. 4 Fax (651) 490-3824 (1980315d)  Copyright 1997–2002 www.alnor.com customerservice@alnor.com TSI Incorporated...

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