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FKS 1DP- PBM-E User Manual  -  Copyright © 2018 FlowKinetics

 LLC, All Rights Reserved

 

 

20 

Appendix A Performing a Pitot Probe Duct Traverse 

Overview 

In  this  Appendix,  use  of  a  Pitot  Static  probe,  in  conjunction  with  the  FKS  series 
instrument will be explained. The Pitot Static probe allows the direct measurement 
of  dynamic  pressure  allowing  calculation  of  the  air  speed  in  ducts,  pipes,  wind 
tunnels, etc. 

 
Measurement of Speed 

A Pitot Static probe is shown below 
 

 

 

The  Pitot  Static  probe  measures  the  total  pressure  (or  impact  pressure)  at  the 
nose of the Pitot probe and the static pressure of the air stream at side ports. The 
difference  of  these  pressures,  i.e.  the  differential  (also  called  dynamic  or  speed) 
pressure (P

differential

) varies with the square of the air speed. Thus the air speed may 

be expressed as: 

al

differenti

air

P

K

V

2

 

   

 

 

 

where 

 

is the air density and K is a correction factor (the K factor) dependent on 

the  design  of  the  Pitot  Static  probe. 

NOTE:

  This  equation  is  typically  valid  for 

incompressible (constant density) flow. 

 

For most Pitot probes, the K factor is 1. For S type (dirty air) probes, K is usually 
0.8 to 0.92; refer to the manufacturer’s data.  

Stem

Static pressure ports

Total pressure port

Static pressure barb (P-)

Total pressure barb (P+)

Содержание FKS 1DP-PBM-E

Страница 1: ...tion Email inform flowkinetics com Web www flowkinetics com Mail FlowKinetics LLC 4700 Shoal Creek Dr College Station TX 77845 USA Telephone 979 680 0659 888 670 1927 Fax 979 680 0659 IMPORTANT Read all instructions and precautions in this manual before use Keep this manual for future reference ...

Страница 2: ... 8 Q How Do I Switch the Unit On and Off 9 Q How Do I Adjust the Screen Contrast 9 Q How Do I Zero the Meter 9 Q How Do I Know if the Batteries Need Replacement 9 Q How Do I Know If the Meter is Overloaded 9 Q How Do I Change the Smoothing of My Data 9 Measuring Pressure 10 Q How Do I Change Units 10 Q How Do I Measure the Minimum L and Maximum H Reading 10 Q How Do I Reset Min Max 11 Q How Do I H...

Страница 3: ...ady for Accurate Measurement 11 Q What Probes can I use with the FKS 1DP PBM E 12 Q How Do I Connect the Pitot Probe 12 Q How Do I Change K 12 Q How Do I Measure Standard Speed 13 Q How Do I Measure Actual Speed 13 Q How Do I Check the Stored Values for K Patm and T 14 Q How Do I Set K Patm and T to Default Standard Conditions 14 Measuring Flow Rate 15 The Menu System 15 Maintenance 16 Operational...

Страница 4: ...rchase price at the Seller s option provided the product has been returned transportation prepaid within one year from date of purchase In no case is the Seller liable beyond replacement of product F O B factory or the full purchase price This warranty does not apply if the product or equipment is abused altered used at ratings above the maximum specified used with disregard of instructions and sp...

Страница 5: ...aged make a record and contact the shipper The instrument is supplied with some accessories are optional Item Description Quantity FKS 1DP PBM E Multi function meter 1 Tubing Flexible tubing for pressure connection 2 FKS Manual User reference 1 WPA Wall power adapter Optional Cable6 6 Serial cable Optional SwiftScan CD and manual Real time software for monitoring the FKS outputs and downloading th...

Страница 6: ...and intuitive functioning Features of the PBM E include Highly configurable operation Differential static and gauge pressure Electronic Zero function to remove drift Metric and Imperial units Minimum maximum reading Data hold screen freeze Turbulence indicator K factor Speed both standard and actual Density correction Intelligent automatic damping with user selectable averaging or smoothing PC com...

Страница 7: ...sure connection barb On Off button Range control or selector External power jack plug Negative or Reference pressure connection barb Hold Zero button Screen contrast control PC serial port connector P 1 67inH2O T H2 01 L 0 21 V 6702ft min H8291 L6231 Measured pressure Maximum recorded value H Calculated speed Maximum recorded value H Turbulence indicator appears if Pressure fluctuations 10 Minimum...

Страница 8: ...Do not attempt to use the supplied adapter as a battery charger CAUTION Use of any power adaptor other than that supplied optional with the instrument will remove any rights of claim against FlowKineticsTM LLC relating to product liability or consequential damage against a third party and will void the warranty If an alternative adaptor is used its output voltage range must be regulated and within...

Страница 9: ...ton for greater than 2 seconds The meter will indicate that the Electronic Zero is in progress Zeroing should be performed periodically while taking measurements to ensure accuracy Q How Do I Know if the Batteries Need Replacement If the battery voltage is too low the message Low Battery will be displayed at startup Also a B will appear at the top RHS of the display wile the meter is operating If ...

Страница 10: ...rate may change as the meter changes adapts the number of averages to give the best and most stable estimate of the pressure or speed To select the method you want set the Range selector to Menu The menu will cycle through various functions When Smooth Average appears rotate any direction the Range control to select it The menu will cycle Exp Smoothing followed by Averaging Rotate the Range select...

Страница 11: ...ure probes Pitot or S type to take speed measurements Q How Do I Change Units Units are changed by rotating the Range selector knob The knob has no stop and can rotate more than 360 degrees Q How Do I Measure the Minimum L and Maximum H Reading The Minimum and Maximum readings are continuously shown by the FKS meter on the second line of the display The maximum reading is preceded by H and the min...

Страница 12: ...essure port should be connected to the P barb the static or reference pressure should be connected to the P barb Q How Do I Change K To set K or a probe s calibration constant default value 1 set the Range selector to Menu The menu will cycle through various functions When Set K factor appears rotate any direction the Range control to select it The menu will prompt Set K Rotate followed by K facto...

Страница 13: ...any direction or unit to set in either metric or imperial units Depending on your selection the screen will display 000 00 metric or 00 00 imperial The first digit will begin to blink To increment this digit press the Hold Zero button You can also keep the button pressed to advance rapidly If the displayed digit increments beyond 9 it will wrap around and continue from 0 When the desired value for...

Страница 14: ...the third digit etc After setting the atmospheric pressure the unit will prompt for the Temperature to be set After setting the instrument will then return to measurement mode Any calculated speeds will then use the values you set for Patm and T Patm and T are stored in memory and will be retained after switching the unit off Q How Do I Check the Stored Values for K Patm and T The values of these ...

Страница 15: ... in any direction and to any unit This provides positive tactile and audible feedback that your selection has been made All numbers are set by pressing the Hold Zero button to increment the digit and by rotating the Range selector to accept the displayed number and advance to the next digit Options available through using the menu system are Set Patm T o Used to set actual speed Set K factor o Use...

Страница 16: ... warning appears on the display B the batteries should be replaced The FKS series should be returned to FlowKinetics LLC for calibration annually Battery Maintenance The batteries of the FKS series are changed as follows Check to ensure that the instrument is turned off Remove the battery compartment cover plate this located on the back of the instrument The plate slides off Carefully remove the o...

Страница 17: ...ensor Zero offset and zero temperature shift eliminated through auto zero without disconnect Accuracy at 25 C Typically within 0 1 of full scale pressure 0 22 max Maximum simultaneous pressure on both ports above ambient 10 psi for sensors with a range of 5 inH2O or below 15 psi for sensors with a range of 12 inH2O or above Speed For available speed ranges Table 2 Corrected by user defined flow pr...

Страница 18: ...capacity Automatic logging 255 group IDs 6 000 reading capacity Display 2 line variable contrast alphanumeric LCD Pressure units Pa kPa inH2O mmHg inHg psi mbar and lb ft2 Speed units m sec ft sec and ft min Compatible Mediums Clean dry non corrosive non flammable gases Output RS232 serial port interface 9 pin connector USB adapter USBA or USBA2 available as an accessory Warranty One year parts an...

Страница 19: ...01 0 1 m sec 0 01 0 01 0 01 0 01 0 1 0 1 ft sec 0 01 0 01 0 1 0 1 0 1 0 1 ft min 1 1 1 1 1 1 m3 sec 0 0001 0 0001 0 0001 0 0001 0 0001 0 0001 ft3 sec 0 0001 0 0001 0 0001 0 0001 0 0001 0 0001 ft3 min 0 001 0 001 0 001 0 001 0 001 0 001 Table 2 Maximum and Minimum Transducer Speed Ranges assuming standard conditions Patm 29 92inHg and T 70ºF Using Pitot Static Probe Pressure Transducer Range Speed ...

Страница 20: ...ure at the nose of the Pitot probe and the static pressure of the air stream at side ports The difference of these pressures i e the differential also called dynamic or speed pressure Pdifferential varies with the square of the air speed Thus the air speed may be expressed as al differenti air P K V 2 where is the air density and K is a correction factor the K factor dependent on the design of the...

Страница 21: ...se is conducted it is necessary to select a suitable location to perform the survey If possible avoid traverses close to fans dampers pipe bends expansions etc Try to survey at least 8 duct diameters downstream of the aforementioned elements and 2 duct diameters upstream of these elements The survey is performed with the aid of Fig A1 Either the Centroids of Equal Areas or Log Tchebycheff point di...

Страница 22: ...s surveyed Vi is the indicated speed at each measurement point Using a Centroids of Equal Areas or Log Tchebycheff point distribution allows the speed measurements to simply be summed and averaged NOTE Assuming fully developed turbulent flow with low air swirl rotation i e after a long section of duct the average duct speed may be estimated using a single Pitot reading at the center of the duct Th...

Страница 23: ...s LLC All Rights Reserved 23 Fig A1 Traverse points for rectangular and circular ducts Either Centroids of Equal Areas OR Log Tchebycheff point distributions can be used x y H W 2 3 4 1 2 3 4 4 Point Example 6 Point Example D x y 5 1 2 3 4 6 1 2 3 4 5 6 ...

Страница 24: ... 0 853 0 957 8 0 032 0 105 0 194 0 323 0 677 0 806 0 895 0 968 10 0 026 0 082 0 146 0 226 0 342 0 658 0 774 0 854 0 918 0 974 12 0 021 0 067 0 118 0 177 0 250 0 356 0 644 0 750 0 823 0 882 0 933 0 979 Rectangular Ducts Log Tchebycheff Points Distance from wall x W or y H 5 0 074 0 288 0 500 0 712 0 926 6 0 061 0 235 0 437 0 563 0 765 0 939 7 0 053 0 203 0 366 0 500 0 634 0 797 0 947 Circular ducts...

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