FlowKinetics FKS 1DP-PBM-E User manual

FKS 1DP-PBM-E Multi-Function Meter
Pressure & Speed
User’s Manual
April 19, 2018
Contact Information
Email:
[email protected]
Web:
www.flowkinetics.com
Mail:
FlowKinetics LLC
4700 Shoal Creek Dr.
College Station, TX 77845
USA
Telephone:
[phone]
[phone]
Fax:
[phone]
IMPORTANT
Read all instructions and
precautions in this manual
before use. Keep this manual
for future reference.

FKS 1DP- PBM-E User Manual - Copyright © 2018 FlowKineticsLLC, All Rights Reserved
2
Table of Contents Page
LIMITATIONS OF USAGE AND CAUTIONS 4
WARRANTY 4
Unpacking / Parts List 5
Overview / Features 6
Description of Controls & Display 7
How Do I: 8
Q: How Do I Insert Batteries / Use Wall Power? 8
Q: How Do I Connect the Tubing? 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 Hold or Freeze the Display? 11
Q: How Can I Estimate if the Pressure May Be Too Unsteady for Accurate Measurement?
11

FKS 1DP- PBM-E User Manual - Copyright © 2018 FlowKineticsLLC, All Rights Reserved
3
Measuring Speed 11
Q: How Do I Change Units? 11
Q: How Do I Measure the Minimum (L) and Maximum (H) Reading 11
Q: How Do I Reset Min/Max? 11
Q: How Do I Hold or Freeze the Display? 11
Q: How Can I Estimate if the Air Speed May Be Too Unsteady 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 Maintenance 16
Battery Maintenance 16
Specifications 17
Appendix A Performing a Pitot Probe Duct Traverse 20

FKS 1DP- PBM-E User Manual - Copyright © 2018 FlowKineticsLLC, All Rights Reserved
4
LIMITATIONS OF USAGE AND CAUTIONS
The FKS series of instruments are not intrinsically safe, and must not be used in dangerous or
hazardous areas. Servicing of these instruments incorporating battery changing must only occur
in a safe area. Use of the FKS series may require working in a hazardous environment.
Necessary safety precautions must be followed.
FlowKineticsTM LLC’s products (including the FKS series) are not authorized for use as any
component in a life support system or device or as component of an aircraft’s on board flight
system. Life support systems or devices are defined as any system that can sustain, monitor or
support life.
The pressure transducers used by the FKS system are compatible with most non-corrosive
gases, however toxic gases are not suitable, nor are liquid pressure measurements.
Any attempts to service or modify or alter the product in any way, will void the warranty and will
negate any right of claim against FlowKineticsTM LLC, relating to any liability in respect of the
product.
WARRANTY
All of FlowKineticsTM LLC's instruments have been assembled using strictly defined and
controlled procedures and tests, and are warranted against any faults in workmanship and
materials for one year from the date of purchase. Liability under this warranty is limited to repair
or replacement F.O.B. factory of any parts which prove to be defective within that time or
repayment of the purchase 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 specified operating procedures, or otherwise
misused in any way. All technical advice, recommendations and services are based on technical
data and information which the Seller believes to be reliable and are intended for use by persons
having skill and knowledge of the application, on their own judgment. There are no implied
warranties of merchantability or of fitness for a particular purpose for goods covered hereunder.
In no event will the manufacturer be responsible for consequential, incidental or special damages
resulting from the use of this product.
Buyer's Remedies: The buyer’s exclusive and sole remedy on account of or in respect to the
furnishing of non-conforming or defective material shall be to secure replacement thereof as said
above. The seller shall not in any event be liable for the cost of any labor expended on any such
material or for any special, direct, indirect, consequential or incidental damages to anyone or any
property by reason of the fact that it shall have been non-conforming or defective.
Repairs: Authorization must be obtained before shipping items to FlowKinetics™ LLC for
repairs. When requesting a repair please include a detailed description of the problem with the
item, date of purchase, your P.O. or reference number and our invoice number if available.

FKS 1DP- PBM-E User Manual - Copyright © 2018 FlowKineticsLLC, All Rights Reserved
5
Unpacking / Parts List
Carefully unpack your FKS 1DP-PBM-E meter. Ensure that there is no damage to
the instrument. If any components are damaged, 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 them to
a PC
Optional

FKS 1DP- PBM-E User Manual - Copyright © 2018 FlowKineticsLLC, All Rights Reserved
6
Overview / Features
The FKS 1DP-PBM-E is a multi-function meter designed for accurate pressure and
speed measurement. The meter is exceptionally easy to use due to its prompt
driven user interface 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 compatibility (optional software)
Variable screen contrast
Wall or battery power

FKS 1DP- PBM-E User Manual - Copyright © 2018 FlowKineticsLLC, All Rights Reserved
7
Description of Controls & Display
Controls of the FKS 1DP-PBM-E are shown below:
Example Display Presentations for Pressure and Speed are Shown Below:
Positive (+) pressure
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 recorded
value (L)
Minimum recorded
value (L)

FKS 1DP- PBM-E User Manual - Copyright © 2018 FlowKineticsLLC, All Rights Reserved
8
How Do I:
The majority of this manual is written in the form of a How Do I… Some topics are
repeated to maintain description continuity.
Q: How Do I Insert Batteries / Use Wall Power?
Batteries: The unit uses two 9V batteries. The batteries are inserted by removing
the cover located on the back of the instrument. The cover slides off. The ribbon
under the batteries can be used to ease battery removal. Only use new batteries
(dry Alkaline leak proof) and discard the old batteries in compliance with
regulations.
Wall Power: An AC adaptor power supply can be supplied with the instrument as
an option. The adaptor can operate from 100VAC to 240VAC 50-60Hz supplies and
provides 1100mA at 9VDC. The adaptor has the facility for easy interchange
between US, European, English and Australian plugs. To use, simply insert the
jack from the adapter into the jack plug on the face of the instrument (see
Description of controls). It is not necessary to remove the batteries, as they are
automatically disconnected. 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:
DCADAPTORDC VVV 129
If the meter is stored, or not used for over a week, the batteries must be removed.
Q: How Do I Connect the Tubing?
Pressure: The supplied flexible tubes attach over the barbs labeled P+ and P-. A
higher pressure at port P+ than port P- will result in an indicated positive pressure.
To measure static or gauge pressure, tubing can be connected to the P+ barb. An
indicated positive pressure shows that the static or gauge pressure is higher than
atmospheric (or the pressure at P-).
Speed: To measure speeds, the P+ port should be connected to the Total
pressure port on the Pitot and the P- port connected to the Static port (see How
Do I Connect the Pitot Probe?) of the Pitot probe.
CAUTION: The FKS series are not suitable for use with toxic or corrosive
gases or for liquid pressure measurement. The series are not approved for
use in any life support application.

FKS 1DP- PBM-E User Manual - Copyright © 2018 FlowKineticsLLC, All Rights Reserved
9
Q: How Do I Switch the Unit On (and Off)?
To switch the meter on, press in the On/Off button. You will hear and feel a click
indicating unit power up. To switch the unit off, press the On/Off button again. If
the Range selector is set to a pressure unit, the instrument will show the meter
model description and then indicate that that the instrument is performing an
electronic Zero. If the Range selector is set to a speed unit, the meter will
additionally show the stored speed and flow settings (K, Patm and T) in both
metric (kPa and C) and imperial units (inHg and F). Cycling the meter On/Off
can be used to rapidly check the speed/flow settings.
Q: How Do I Adjust the Screen Contrast?
Screen contrast is adjusted by rotating the screen contrast knob. Only use your
fingers to operate this control.
Q: How Do I Zero the Meter?
Zeroing is easily accomplished using the inbuilt electronic Zero. Disconnect any
pressure source from the meter. Depress the Hold/Zero button 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 Bwill appear at the top RHS of the display wile the
meter is operating. If the battery is too drained for the meter to work properly, the
message Battery Depleted will be displayed at startup and the meter
will not continue until the batteries are replaced or a wall power supply is used.
Q: How Do I Know If the Meter is Overloaded?
If the pressure rating for the transducer is exceeded, the meter will indicate on the
display an overload condition (Overload). Pressure should be relieved
immediately to avoid damage.
CAUTION: The maximum differential pressure that may be imposed on the
transducer is 5psi, with a maximum line pressure of 10psi.
Q: How Do I Change the Smoothing of My Data?
The FKS 1DP-PBM-E meter contains sophisticated routines to process your
measurements (very useful when they are unsteady or fluctuating). Two methods
can be used to smooth your readings. An exponential moving average (sometimes

FKS 1DP- PBM-E User Manual - Copyright © 2018 FlowKineticsLLC, All Rights Reserved
10
called exponential smoothing) can be used (somewhat similar to a normal moving
average) and of the form:
2)1(12*PffPP 
(Exp. Smoothing)
where P2* is the new pressure estimate (shown on the display), P2 is the latest
pressure value measured from the transducer and P1 is the last pressure
estimate. In the PBM-E meter, fis adjusted continuously (adaptive) depending on
the level of fluctuation of the measured pressure. If there is little fluctuation f will be
close to zero. If fluctuation is large, fhas a maximum value of 0.9. Thus fis
continuously adjusted by the meter (between 0 and 0.9) to provide the most stable
reading.
The second method that can be used is a simple averaging of readings
(Average). The meter will read the output from the pressure transducer
multiple times, and then average these values. The meter will continuously adjust
the number of averages (from 5 to 75 averages). This operation may be
noticeable, as the screen update 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 selector (any
direction or unit) when the desired method is displayed. The instrument will then
return to measurement mode. The method you selected is stored in memory and
will be retained after switching the unit off. For very unstable readings, the
exponential smoothing may offer a more stable estimate, where the averaging will
offer a quicker estimate.
Measuring Pressure
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
minimum reading is preceded by L. No units are shown but correspond to the units
displayed on the first line.

FKS 1DP- PBM-E User Manual - Copyright © 2018 FlowKineticsLLC, All Rights Reserved
11
Q: How Do I Reset Min/Max?
To reset the Min/Max (or L-H) readings, simply change the units (to any other unit
setting) by rotating the Range knob and then set back to your desired units.
Q: How Do I Hold or Freeze the Display?
Press the Hold/Zero button for less than 2 seconds. The display will freeze,
indicated by the appearance of a Hat the top RHS of the display. To resume
operation, press the Hold/Zero button again.
Q: How Can I Estimate if the Pressure May Be Too Unsteady for Accurate
Measurement?
If the measured pressures fluctuate more than 10%, an indicator Twill appear at
the top RHS of the display. This may suggest that another measurement location
may be necessary.
Measuring Speed
The PBM-E uses differential pressure 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
minimum reading is preceded by L. No units are shown but correspond to the units
displayed on the first line.
Q: How Do I Reset Min/Max?
To reset the Min/Max (or L-H) readings, simply change the units (to any other unit
setting) by rotating the Range knob and then set back to your desired units.
Q: How Do I Hold or Freeze the Display?
Press the Hold/Zero button for less than 2seconds. The display will freeze,
indicated by the appearance of an Hat the top RHS of the display. To resume
operation, press the Hold/Zero button again.
Q: How Can I Estimate if the Air Speed May Be Too Unsteady for Accurate
Measurement?

FKS 1DP- PBM-E User Manual - Copyright © 2018 FlowKineticsLLC, All Rights Reserved
12
If the measured pressures fluctuate more than 10%, an indicator Twill appear at
the top RHS of the display. This may suggest that another measurement location
may be necessary.
Q: What Probes can I use with the FKS 1DP-PBM-E?
Any Pitot static probe or S type probe can be used. Most Pitot probes have unity
calibration coefficients (K factor). S type probes (used for dirty air streams) have
coefficients around 0.80 to 0.92. To set K, see below.
Q: How Do I Connect the Pitot Probe?
See the sketch below. P+ is the top left barb; P- is the top right barb. For
connection of other types of probes, the stagnation (total) pressure 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 factor. Rotate the
Range selector (any direction or unit). Press & Rotate will be briefly
displayed. The screen will display 0.00. 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 this digit is set, rotate the
Range selector (any direction or unit). The second digit will begin to blink. Use the

FKS 1DP- PBM-E User Manual - Copyright © 2018 FlowKineticsLLC, All Rights Reserved
13
Hold/Zero button to set the desired value; similarly for the third digit. The
instrument will then return to measurement mode. Any calculated speeds will then
use the K factor you set. The K factor is stored in memory and will be retained
after switching the unit off. The measured speed multiplies K, see Appendix A.
See the Pitot probes instructions for the value of K (usually = 1 for most Pitot
probes).
Q: How Do I Measure Standard Speed?
Standard speed corresponds to a density based on a pressure, Patm, of
101.325kPa (29.92 inHg @ 32ºF) and a temperature, T, of 21.1ºC (70ºF). The
FKS 1DP-PBM-E allows you to manually set Patm and T. These values can be set
in two ways:
1. Set the Range selector to Menu. The menu will cycle through
various functions. When Set Patm & Temp appears,
rotate (any direction) the Range control to select it. The menu will
prompt, Set Units Rotate followed by kPa
alternating with inHg @ 32F. When the desired unit appears,
rotate the Range selector (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 this digit is set, rotate
the Range selector (any direction or unit). The second digit will begin
to blink. Use the Hold/Zero button to set the desired value; similarly
for the third digit, etc. After setting the atmospheric or absolute
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.
2. Set the Range selector to Menu. The menu will cycle through
various functions. When Reset K, Patm, T appears,
rotate (any direction) the Range control to select it. The menu will
indicate that K, Patm and T have been reset to default (i.e. standard
conditions). Note that K is also reset to 1 (default).
Q: How Do I Measure Actual Speed?

FKS 1DP- PBM-E User Manual - Copyright © 2018 FlowKineticsLLC, All Rights Reserved
14
The atmospheric pressure (Patm, this is the absolute pressure in the flow to be
measured) and temperature (T) of your airflow measurements should be set
manually. To measure actual speed, the temperature and absolute (barometric)
pressure of the air to be measured must be known.
Set the Range selector to Menu. The menu will cycle through various functions.
When Set Patm & Temp appears, rotate (any direction) the Range
control to select it. The menu will prompt, Set Units Rotate followed
by kPa alternating with inHg @ 32F. When the display shows the units
you want, rotate the Range selector (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 this digit is set, rotate the Range selector (any
direction or unit). The second digit will begin to blink. Use the Hold/Zero button to
set the desired value; similarly for 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 parameters can be checked in two ways:
1. Before switching the unit on, set the Range selector to a speed unit.
On power up, the meter will show the stored speed and flow settings
(K, Patm and T) in both metric (kPa and C) and imperial units (inHg
and F). The unit can be cycled On/Off as needed.
2. Set the Range selector to Menu. The menu will cycle through
various functions. When View K, Patm & T appears,
rotate (any direction) the Range control to select it. The unit will then
display the stored K factor, followed by Patm and T in metric units
(kPa and C) followed by imperial units (inHg @ 32F and F). After
displaying each unit set for approx. 2 seconds, the instrument will
return to measurement mode.
Q: How Do I Set K, Patm and T to Default (Standard Conditions)?
Set the Range selector to Menu. The menu will cycle through various functions.
When Reset K, Patm, T appears, rotate (any direction) the Range
control to select it. The menu will indicate that K, Patm and T have been reset to
default (i.e. standard conditions). Note that K is also reset to 1 (default).

FKS 1DP- PBM-E User Manual - Copyright © 2018 FlowKineticsLLC, All Rights Reserved
15
Measuring Flow Rate
Flow rate is measured by calculating an average speed for the conduit of interest,
and then, multiplying this speed by the cross sectional area of the duct at the
measurement location. The speed value may be estimated using a single reading
or a survey across the duct at a station (see Appendix A).
The Menu System
The menu system uses prompt driven operation for ease of use. All option
selections are performed by rotating the Range selector (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
oUsed to set actual speed
Set K factor
oUsed to set the calibration constant (K) for non-unity
probes (e.g. S type probes)
View K, Patm & T
oUsed to view the currently stored values for these
parameters
Reset K, Patm, T
oUsed to reset to default and standard conditions (K=1,
Patm=29.92inHg and T=70ºF)
Smooth/Average
oUsed to select between exponential smoothing or
averaging for measurements

FKS 1DP- PBM-E User Manual - Copyright © 2018 FlowKineticsLLC, All Rights Reserved
16
Maintenance
Operational Maintenance
Ensure that the FKS meter is kept clean dry and does not come into
contact with any corrosive elements.
Do not use any solvents for cleaning purposes. To clean surfaces,
wipe with a clean dry cloth.
When not in use, the pressure barbs should be covered with the
supplied Silicone tubing links to avoid dust and moisture
contamination.
When the low battery 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 old batteries. The ribbon under the batteries
may be used to aid removal.
Replace all the batteries with fresh batteries (2 x 9V dry alkaline leak
proof). Be careful to ensure the correct battery polarity. Do not mix
new and old batteries.
Replace the compartment cover plate.
LO

FKS 1DP- PBM-E User Manual - Copyright © 2018 FlowKineticsLLC, All Rights Reserved
17
Specifications
Dimensions
5.7 in × 3.6 in × 1.8 in (14.5 cm × 9.1 cm × 4.5 cm)
Weight
0.67 lb (0.305 kg) excluding batteries
Working
Temperatures
Operating: 32F to 122F (0C to 50C)
Storage: 14F to 140F (-10C to 60C)
Power supply
2 × 9V Alkaline batteries (life: approx. 40hours) or optional
wall adapter (WPA)
Pressure
For available pressure ranges see Table 2
Measures True Differential, Static and Gauge Pressure
using a fully temperature compensated sensor.
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 pressure and temperature.
Using Speed probe with user selectable flow coefficient
Accuracy at 25°C: Typically within ±0.24% of full scale
speed
K factor
Probe coefficient set by user. Range: 0.00 to 9.99
Density correction
Set by user (temperature and pressure)
Duct dimensions
(for on-board Pitot survey routine) up to 99.999ft

FKS 1DP- PBM-E User Manual - Copyright © 2018 FlowKineticsLLC, All Rights Reserved
18
Damping
Automatic and adaptive. User selectable exponential
smoothing or averaging
Manual logging
255 group IDs. 4,000 reading 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 and labor.

FKS 1DP- PBM-E User Manual - Copyright © 2018 FlowKineticsLLC, All Rights Reserved
19
Table 1 Display Resolutions
Sensor pressure range (inches H2O)
Unit
±0.25
±0.5
±1.0
±5
±12
±20
Pa
0.01
0.1
0.1
1
1
1
kPa
0.00001
0.0001
0.0001
0.001
0.001
0.001
inH2O
0.0001
0.0001
0.001
0.001
0.01
0.01
mmHg
0.0001
0.0001
0.001
0.001
0.01
0.01
inHg
0.00001
0.00001
0.00001
0.0001
0.0001
0.001
psi
0.000001
0.00001
0.00001
0.0001
0.0001
0.0001
mbar
0.0001
0.001
0.001
0.01
0.01
0.01
lb/ft2
0.001
0.001
0.001
0.01
0.01
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 Range
±0.25 inH2O (±60 Pa)
100 - 2000 ft/min (0.5- 10.2 m/sec)
±0.5 inH2O (±124 Pa)
141 - 2829 ft/min (0.7- 14.4 m/sec)
±1 inH2O (±249 Pa)
200 - 4001 ft/min (1 - 20.3 m/sec)
±5 inH2O (±1.2 kPa)
447 - 8946 ft/min (2.3 - 45.4 m/sec)
±12 inH2O (±3 kPa)
693 - 13859 ft/min (3.5 - 70.4 m/sec)
±20 inH2O (±4.98 kPa)
895 - 17892 ft/min (4.5 –90.9 m/sec)

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 (Pdifferential) varies with the square of the air speed. Thus the air speed may
be expressed as:

aldifferenti
air
P
KV 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+)