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Alnor 275 Owner's Manual

Thermo-anemometer
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OWNER'S MANUAL
Thermo-Anemometer
Probe Model 275

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Summary of Contents for Alnor 275

  • Page 1 OWNER’S MANUAL Thermo-Anemometer Probe Model 275...
  • Page 2 LIMITATION OF WARRANTY AND LIABILITY Seller warrants that this product, under normal use and service as described in the operator's manual, shall be free from defects in workmanship and material for a period of twenty-four (24) months, or the length of time specified in operator's manual, from the date of shipment to the customer.

  • Page 3: Table Of Contents

    7. CLEANING ..................8 Handle, Telescopic Tube and Electronics Housing ...... 8 Probe Tip ..................8 8. PERFORMANCE CHECK............... 9 9. SERVICE AND REPAIR..............10 Service and Repair..............10 Instructions for Return ..............11 Damaged in Transit ..............11 275 PROBE SPECIFICATIONS...

  • Page 4: General Description

    1. GENERAL DESCRIPTION The Model 275 is a thermo-anemometer probe that can be used with Alnor 8575 CompuFlow , APM 150, or APM 360 meters to measure ® air speed and temperature. The probe can measure air speed from 20 to 6000 feet per minute (0.1 to 30 meters per second).
  • Page 5 Temperature Sensor Note: Arrow points in direction of air flow Velocity Sensor Pivot Knurled Retaining Nut Circular Connector with a Knurled Screw Telescopic Tube Electronics Housing 7’ Cord...

  • Page 6: Safety

    The operational range of the probe is 32° to 122°F (0° to 50°C) and must not be exceeded. The Model 275 probe is not designed for gas mixtures other than air. Use with corrosive or other dangerous gas mixtures is not recommended.

  • Page 7: Theory/Correction Factors

    4. THEORY/CORRECTION FACTORS Thermo-anemometers operate on the principle of heat transfer. A sensor is heated above room temperature by passing current through a resistance. Electrical energy is converted to heat. Through convective heat transfer, the heat is passed on to the fluid passing over the heated element.
  • Page 8 For your convenience we have made a chart for determining the correction factor given temperature and pressure. Note: The atmospheric pressure as reported by the National Weather Service is corrected to sea level and cannot be used if measurements are not at sea level. For more information on calculating local air density, call the Customer Service Department at TSI.

  • Page 9: Troubleshooting Guide

    5. TROUBLESHOOTING GUIDE Symptom Possible Causes and Corrective Actions Measurement is Probe is not being held steady—secure probe on test erratic stand. Flow field is unstable. Measurement is being made at edge of jet or behind fan—try slower time constant as described in meter manual.

  • Page 10: Maintenance

    6. MAINTENANCE The 275 probe is manufactured with solid state components. However, periodic maintenance consisting of a performance check should be made every six months as described in the Performance Check section of this manual. The probe should also be cleaned and checked for signs of physical damage.

  • Page 11: Performance Check

    (10 m/s). 3. Ideally, velocity should be checked against a standard that is at least 4 times more accurate than the 275 probe. This is likely to be very difficult to accomplish. Therefore, a standard at least as good as the 275 probe must be used. This means that a pitot- static probe will generally not be a good standard at flows under 1000 fpm (5 m/s).

  • Page 12: Service And Repair

    Dirt can adversely affect the calibration of the probe. 6. The 275 probe reads standard fpm. Read the Theory section describing standard conditions and how the probe should be corrected. Be sure that the proper corrections for temperature and atmospheric pressure are applied to both the probe being tested and the measurement standard being used.

  • Page 13: Instructions For Return

    Please have the following information available when you call: Owner’s name, address, and phone number Billing address, if different and applicable Instrument name or model Serial number Date of purchase Where purchased TSI recommends that you keep a “calibration log” and keep all records of service on your instrument.

  • Page 15: 275 Probe Specifications

    275 PROBE SPECIFICATIONS Range 20 to 6000 feet per minute fpm Air Velocity 32 to 122°F Temperature 0.001 below 1 Resolution 0.01 from 1 to 10 0.1 from 10 to 100 1 above 100 Accuracy* ±5 fpm from 20 to 100 fpm Standard Conditions ±3% of reading ±2 fpm from 101 to 700 fpm...
  • Page 16 _____________________________________________________________ TSI Incorporated Alnor Products 500 Cardigan Road Shoreview, MN 55126 USA Toll Free (800) 424-7427 July 2002 Telephone (651) 490-2811 Printed in USA Fax (651) 490-3824 Patent # 5,162,725 www.alnor.com Part No. 116-159-075 Rev. 4  Copyright 1998-2002 TSI Incorporated...

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