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16 

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. 
 

Act Vel

ft

.

.

460 + 55

14.24

=

+







=

1200

460 70

14 7

12037

.

.

/ min

 

 

Example No. 2 

 
You need to measure the actual velocity in a 
plenum. The air pressure is 99.4 kPa and the 
temperature is 27°C. The display reading on the 
meter is 2.30 m/s. 
 

Act Vel

m s

.

.

273+27

99.4

=

+







=

2 30

273 211

1014

2 39

.

.

.

.

/

 

 
 

Содержание 9870

Страница 1: ...Model 9870 Air Velocity Meter OWNER S MANUAL ...

Страница 2: ...RRANTY OF FITNESS FOR PARTICULAR PURPOSE OR MERCHANTABILITY IS MADE TO THE EXTENT PERMITTED BY LAW THE EXCLUSIVE REMEDY OF THE USER OR BUYER AND THE LIMIT OF SELLER S LIABILITY FOR ANY AND ALL LOSSES INJURIES OR DAMAGES CONCERNING THE GOODS INCLUDING CLAIMS BASED ON CONTRACT NEGLIGENCE TORT STRICT LIABILITY OR OTHERWISE SHALL BE THE RETURN OF GOODS TO SELLER AND THE REFUND OF THE PURCHASE PRICE OR...

Страница 3: ...ring temperature 5 Measuring velocity 6 Switching on the power 6 Selecting temperature velocity display 7 Selecting the sensor response 7 Batteries 8 CHAPTER 3 Maintenance 10 Probe tip 10 Cases 11 Storage 11 Service 11 CHAPTER 4 Troubleshooting 12 APPENDIX A Standard Velocity vs Actual Velocity 14 APPENDIX B Specifications 17 ...

Страница 4: ......

Страница 5: ...ontainer Check the individual parts against the list of components in Table 1 if any are missing or damaged notify TSI immedi ately Table 1 List of components Qty Item 1 Model 9870 1 Carrying case 4 AA alkaline batteries 1 Operation and service manual Installing the batteries Install batteries by loosening the screw in the battery access cover located on the back of the instrument Insert four AA s...

Страница 6: ... 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 To retract or collapse the probe simply push the tip of the probe straight toward the handle When you collapse the probe be sure to allow room for the cable to move freely out of th...

Страница 7: ...sure temperature first HINT for measuring temperature Switch the meter to the temperature mode before turning the instrument on This will minimize the time required for the temperature sensor to stabilize The temperature measuring sensor is in the window near the end of the probe Extend the probe and expose the sensor in the window to the air where you want to measure temperature When you measure ...

Страница 8: ...then re stabilize when placed into higher flow For best response time at velocities of 100 200 fpm 0 5 1 meters sec it is recommended to first place the probe into the flow and then turn the meter on When the meter is in the velocity mode the temperature sensor will be warmed by heat from the velocity sensor If the meter is then switched to temperature mode it will read several degrees high until ...

Страница 9: ...t you purchased The units of measure cannot be changed in the field Selecting temperature velocity display The TEMP VEL switch on the instrument allows you to switch between the instrument s two measuring modes Slide the switch to the TEMP position to read the current temperature or to the VEL position to read the current velocity Selecting the sensor response The Model 9870 has a FAST SLOW respon...

Страница 10: ...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 Table 2 shows typical battery life for both alkaline and nickel cadmium batteries at three velocities Table 2 Typical batter...

Страница 11: ...w minutes to complete the meas urements you are making While the indicator is blinking the meter continues to measure accu rately If the battery voltage falls below 3 5 VDC the display will read LO and the BAT indicator will be on continuously Batteries must then be replaced before velocity readings can be taken If you do not install fresh batteries and the voltage falls below 2 volts the display ...

Страница 12: ... meter must be switched off for cleaning Do not use high pressure air strong solvents or brushes to clean the sensor tip damage to the sensor could result To remove dust blow it off with a gentle stream of air or rinse it off with a gentle stream of water To remove a combination of dust and oil rinse the probe tip in isopropyl alcohol and then blow it off with a gentle stream of air Never use heat...

Страница 13: ...revent damage due to leaking batteries Service To maintain a high degree of accuracy in your velocity measurements TSI recommends that you return your instrument to the factory for annual calibration For a nominal fee we will calibrate the unit and return it to you with a certificate and NIST traceability This annual checkup assures you of consistently accurate readings it is especially important ...

Страница 14: ... Possible Causes Corrective Actions No display Unit not switched on Switch on the unit Low or dead batteries Replace the batteries Dirty battery contacts Clean the battery contacts Batteries installed incorrectly Check the battery alignment against illustration inside battery cover BAT is blinking Batteries are getting low Replace the batteries Display reads LO and the BAT indicator is on Batterie...

Страница 15: ...ess turbulent section of the flow or set the RESPONSE switch to SLOW Velocity reading blinks 4000 fpm or 20 32 m s The velocity exceeds 4000 fpm or 20 32 m s Use an alternate method to measure the velocity Sensor may be damaged Contact TSI Display indicates over 10 fpm 0 05 m s with probe retracted Sensor may be damaged Contact TSI ...

Страница 16: ...he air would be moving if the temperature and pressure were at standard conditions It is usually the most useful measure of airflow because it defines the heat carrying capacity of the air Actual velocity is the velocity at which a micro scopic particle of dust would be traveling if it were in the air stream Because actual air density is rarely equal to air density at standard conditions actual ve...

Страница 17: ...ensity correction factor Act Vel Std Vel T P 460 460 70 14 7 Where T Ambient temperature in F P Ambient pressure in psia If you use metric units the equation becomes Act Vel Std Vel T P m m 273 273 211 1014 Where Tm Ambient temperature in C Pm Ambient pressure in kPa ...

Страница 18: ...14 24 psia You take a measurement and the display reads 1200 fpm Act Vel ft 460 55 14 24 1200 460 70 147 12037 min Example No 2 You need to measure the actual velocity in a plenum The air pressure is 99 4 kPa and the temperature is 27 C The display reading on the meter is 2 30 m s Act Vel m s 273 27 99 4 2 30 273 211 1014 2 39 ...

Страница 19: ...1 F 1 C Accuracy 1 F 1 C OPERATING TEMPERATURE RANGE Instrument 32 to 149 F 0 to 60 C Probe 0 to 200 F 18 to 93 C EXTERNAL METER DIMENSIONS Size Measurements 2 75 in x 1 3 in x 5 2 in 70 mm x 33 mm x 132 mm METER PROBE TYPE Description Detached telescoping Material Nickel plated brass and stainless steel METER PROBE DIMENSIONS Probe length 37 in 94 0 cm telescopic Probe tip diameter 0 236 in 6 0 m...

Страница 20: ...imum 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 1 The accuracy statement of 5 0 of reading or 5 fpm 0 025 m s begins at 25 fpm through 4000 fpm 0 13 through 20 00 m s U S National Institute of Standards and Technology ...

Страница 21: ...ardigan 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 www alnor com Copyright 1997 2002 customerservice alnor com TSI Incorporated ...

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