deltaCal
EPA-FRM Compatible Field Audit Calibrator
NI ST Traceable – I SO 9001:2008
Instructions
Including the
P Series
BGI Incorporated
58 Guinan Street
Waltham, MA 02451
Tel: 781.891.9380
Fax: 781.891.8151
www.bgiusa.com
info@bgiusa.com
Version 2.0.0
July 2011
NOTICE
When switching on your deltaCal the start up screen briefly displays the version of Firmware. If the
number begins with 2.3 or lower this manual applies to your instrument. If the version begins with 2.4
it covers a slight range change and is detailed in Appendix C. If the version begins with 2.5 or higher it
it contains improved Firmware which permits the display significantly more information. These
improvements are covered in Appendix D.
Table of Contents.
Section
Topic
Page
1.0
Quick Start
3
2.0
Introduction
3
3.0
Specifications
5
4.0
Principle of Operation
9
5.0
Instrument Set Up
9
6.0
Using the deltaCal
12
7.0
Software
14
8.0
Maintenance
14
9.0
Safety
14
10.0
Warranty
15
Appendix A
NIST Traceability
15
Appendix B
Use of deltaCal with Non Volumetric Samplers
18
Appendix C
Range change for wider applications.
19
Appendix D
Expanded Firmware and applications
19
Appendix E
P Series Set Up
21
2
1.0 Quick Start
In order to put the deltaCal to immediate use as an FRM Audit device, follow these steps.
Step 1: Remove the deltaCal from its carrying case and turn it on.
Step 2: Remove the “10 micron” inlet from your FRM sampler, but leave the 12 inch down tube
in place.
Step 3: Install the deltaCal measuring head on the 12 inch down tube in place of the 10 micron
inlet. If the instrument to be audited is not already running, start it now.
Step 4: You may now read the deltaCal screen to determine volumetric flow rate, ambient
temperature and barometric pressure.
Step 5: Shut off the audited unit, open the filter cassette holder and remove the cassette. The
filter temperature-monitoring probe will now be visible. Plug the hand held temperature probe
provided with the deltaCal into the control module. Hold the tip of the probe within 1 cm. of the
filter temperature probe, without touching it. Ensure that direct sunlight does not fall on either
sensor. You may now audit filter temperature.
For a diagram of the immediate application refer to Figure 1.
2.0 Introduction
The BGI deltaCal is an EPA FRM compatible flow audit device, based on the air flow measurement
principle of the venturi1. It was developed by BGI and is manufactured in BGI’s ISO 9001-2008
facility. It provides a LCD indication of volumetric and standard flow rate, barometric pressure,
ambient temperature and a filter temperature probe. It operates on either four AA alkaline energy
cells (batteries) or a (provided) line (mains) power module. The electronics are all housed in the
control module.
In 2011 BGI introduced the P Series of flow calibrators. These instruments may
be identified by a letter P in the boot up screen where the version number is
displayed. The Version Number will be 3.0.0 or higher. They represent a complete
revision of the Firmware to provide the user with advanced application utility.
Throughout this manual additional sections have been labeled "P Series" and will
apply to the newer instruments. All instruments retuned for recalibration/repaired
will upgraded to the P Series specification.
3
MEASURING HEAD
DOWN TUBE
CONTROL
MODULE
PQ 200
Figure 1- Instalation of deltacal on an FRM
2171
4
3.0 Specifications
Flow rate range:
Temp. Operational range
Temp. Reading range
Barometric pressure range
2 – 20 Lpm (± 1%)
-30° C to 55° C
-30° C to 55° C (± .5° C)
400 to 800 mm of Hg (± 5mm)
Dimensions:
Measuring Head
5 in. Max OD (12.7 cm) X 10 in. high (25.4 cm)
Control Module
8 in. high (20.3 cm) X 4 in. wide (10.15 cm) X 1.7 in.
thick ( 4.32 cm)
Combined weight
2.2 lbs (1 kg)
Hand held temp probe
Length of cable:
Length of probe:
33 in (83.8 cm)
5 in (12.7 cm)
Carrying case:
Dimensions:
18 in wide (45.7 cm) X 13 in high (33 cm) X 7 in. thick
(17.8 cm)
Weight complete with contents:
5.5 lbs (2.5 kg)
One complete instrument comprises:
Quantity
Description
Catalog/Part No.
1
1
1
4
deltaCal
Temperature Probe
Plug in Power Supply
Extra AA batteries
1
Instruction Manual
1
1
Fitted Hard Carrying Case
Software Disk
DC-1
DC-2
DC-3 (120/240V)
replacements
obtained locally by user
Download PDF file from
BGI website
DC-4
DC-5
The deltaCal, in its carrying case is shown in figure 2
Replacement supplies (not included with initial purchase).
1
1
1
Set of 4 pressure tap “O” rings
Replacement Thumb Screw (ea.)
Replacement socket “O” rings (2)
Adapters for non FRM applications
DC-8
DC-9
deltaCal to ¼ in. hose barb
deltaCal to 5/16 in. hose barb
5
DC-6
DC-7
X010
MEASURING
HEAD
HAND HELD
TEMPERATURE
PROBE
CONTROL
MODULE
AC
ADAPTER
MISCELLANEOUS
SPARE
BATTERIES
Figure 2- deltaCal In Travel case
2174
6
AMBIENT
THERMISTOR
PROBE
GILL SCREEN
TO CONTROL MODULE
THROAT TAP
UPSTREAM
PRESSURE
TAP
WIND GUST
SHROUD
DISASSEMBLY
KNOB
AIR FLOW
PATH
AIR FLOW
PATH
VENTURI
STANDARD
FRM SAMPLER
SOCKET
Figure 3- Sectional View of
Flow Measuring Head
2167
7
AIR FLOW
DIFF. PRESSURE
SENSOR
VENTURI
MICRO PROCESSOR
TO FRM
SAMPLER
BAROMETRIC
PRESSURE
SENSOR
B P : 7 6 0 . 0 mm Hg
Ta: 24.8°C
Q a : 1 6 . 6 7 LPM
Batt
Q s : 1 6 . 7 2 LPM
100%
LCD DISPLAY SCREEN
Figure 4- Schematic Diagram of deltaCal
2168
8
4.0 Principle of Operation
The deltaCal measures volumetric flow rate by utilizing a pressure transducer to assess the pressure
drop caused by air being drawn through a venturi. As the flow rate through the venturi increases
the pressure drop increases as the square root1. A four times increase in pressure drop yields twice
the flow rate. A desirable feature of the venturi is that most of the pressure drop created by the
instrument is recovered in the expansion section of the venturi. Therefore, measurements are made
at nearly the true operating conditions of the sampler.
The signal from the pressure transducer is sent to the microprocessor where, it is combined, via an
algorithm with information from the barometric pressure sensor and the ambient temperature
sensor. To eliminate “fluttering” of the on screen display of volumetric flow rate, the first 20
readings are averaged and then carried on as a rolling average. Barometric pressure and
temperature are monitored and displayed on a continuous basis, when the instrument is switched
on. An additional temperature probe may be used for the purpose of auditing an FRM sampler’s
filter temperature. The temperature of the probe is displayed on the screen when it is plugged into
the module. A cutaway diagram of the measuring head is shown in figure 3 and a schematic
diagram of the system is shown in Figure 4.
5.0 Instrument Set-up
Remove the instrument from its carrying case and plug in the filter temperature probe to the labeled
port provided in the end panel. (See Figure 5).
Important points to be noted concerning the utilization of the deltaCal
A. The measuring head must have no air flowing through it.
Every time the instrument is switched on, it re-zeros itself. If air is flowing, that flow rate
will be set as zero.
B. The control module must be in the position in which it is going to be used, when switching
on. (Horizontal or vertical). The case houses the pressure transducers, which are subject to
the force of gravity. Positional changes can give rise to minor errors. This effect applies to
all devices containing pressure transducers.
C. In order to perform the most precise measurement audit, it is necessary for the deltaCal to
be in thermal equilibrium with the ambient environment in which the sampler to be audited
is located. The best procedure is to deploy the deltaCal, out of its carrying case, for one
hour prior to the audit, in the vicinity of the sampler to be audited. With the introduction of
anodized Aluminum components during 2004 this time constraint is reduced to 10 minutes.
Additionally, if the deltaCal is subject to a temperature change of more than five degrees
during use, it should be rebooted.
When the deltaCal is switched on and no external power is being utilized XX % battery
capacity remaining is displayed on the screen. So long as more than 10% is indicated, it is
safe to proceed in that at least one hour of power is available. If the provided AC adaptor is
utilized, the screen will indicate “DC In” and there is no limit to the run time.
Note Use of an AC power supply, other than the one provided, can cause severe damage to
circuit components. If the unit provided becomes lost or dysfunctional, use only AA batteries
for operation. The audit is now ready to be performed.
9
AC POWER
SOCKET
ON/OFF SWITCH
CONNECTION TO
SENSING HEAD
DATA PORT
FILTER TEMP.
PROBE SOCKET
Figure 5- deltaCal Control Panel
2169
10
Table 1 Audit Data Format
Audited Instrument:
Make:___________________________ Model:_____________________ S/N:________________
Date:__________________ Time:________________ deltaCal S/N:________________________
Flow Rate – Lpm
Sampler:___________
% diff. = [(deltaCal-sampler)/deltaCal]x100
DeltaCal:___________
Allowed diff. = 4%; Pass________ Fail_________
Ambient Temp. – C
Sampler:___________
DeltaCal:___________
Allowed diff. = ± 2 C; Pass________ Fail_________
Barometric Pressure – mm of Hg
Sampler:___________
DeltaCal:___________
Allowed diff. = ± 10 mm; Pass________ Fail_________
Stop sampler, open filter holder, remove cassette and hold tip of Temp. Probe adjacent to samplers
Filter Temp. Probe without touching it.
Filter Temp. C
Sampler:___________
DeltaCal:___________
Allowed diff. = ± 2 C; Pass________ Fail_________
11
6.0 Using the deltaCal
6.1 To perform an audit
One of two procedures should now be performed.
Procedure A. Turn off the sampler to be audited. Remove the “10 micron” louvered inlet.
Leave the 12 inch down tube in place. Plunge the deltaCal measuring head onto the 12inch down tube. Turn on the deltaCal, wait for the screen to finish the start up boot, and
then turn on the air sampler.
Procedure B. With the sampler to be audited running, remove the “10 micron” louvered
inlet. When the screen has finished its start up boot, plunge the measuring head onto the
12 inch down tube
.
The flow resistance of the deltaCal head may cause momentary instability in the air samplers flow
control circuit. Once the air samplers main screen flow rate indicator stabilizes, the reading may
be taken. A simple audit data format is shown in Table 1.
Once the dynamic reading of flow rate is completed, the air sampler pump may be shut down per
manufacturer’s instructions and the filter temperature sensor may be audited. Open the filter
cassette clamping mechanism and remove the cassette. You can now view the filter temperature
sensor. Hold the probe of the deltaCal filter temperature sensor within 1 cm. of the samplers
sensor without actually touching it. Shield both sensors from direct sunlight. Read both the
samplers indicated filter temperature and the deltaCal’s probe temperature and record them.
It should be noted that some brands of sequential samplers may require minor disassembly to
gain access to the filter temperature sensor.
6.2
To perform a calibration.
The procedures and calculations for using the deltaCal to calibrate a sampler are the same as an
audit, except the flow rate tolerance of is +2% rather than +4% as allowed for an audit. While
full EPA procedures are carefully spelled out in the FRM2, it is important to note that the flow rate
should be calibrated at the operational point and 10% above and below that point, as indicated in
Table 2.
Table 2 EPA FRM Calibration Points
Standard Flow Rate – Lpm
16.67
± 2%
16.34 – 17.00
10% Below Standard – Lpm
15.00
14.7 – 15.30
10% Above Standard – Lpm
18.30
17.97 – 18.71
12
PRESSURE TAP "O" RINGS (8)
PRESSURE TAPS (2)
MOUNTING/SPACING LUGS (3)
VENTURI BODY
SOCKET "O" RINGS (2)
2173
Figure 7 – Salient Details of Venturi Body
13
7.0 Software
In January 2008, the software for all BGI electronic calibrators was been replaced by a completely
new suite known as BGI Open. This suite has been revised and renamed to BGI OpenCal and can
be downloaded at: http://www.bgiusa.com/cal/BGIOpenCal-Setup.exe
NOTE: Only the “Capture Data Stream” can be used on earlier operating systems of BGI calibrators
with this utility. All functions work with the “P series” operating systems.
Free upgrades to the “P series” system will be installed the next time you have your instrument
calibrated at BGI. This will only be done at the time an instrument is sent to BGI for calibration.
8.0 Maintenance
Beyond battery replacement, the only part of the instrument requiring attention is the flow passage
through the venturi. After long periods of use, some atmospheric dust can coat the interior flow
surfaces. The presence of such a deposit may be ascertained by viewing the interior of the venturi
under bright light; direct overhead sunlight being preferable. Holding the instrument in the inverted
position, glance into the interior, seeking any discoloration of the white or Silver surface. If it is
determined that cleaning is required, refer to Figure 3.
Remove the three knurled thumbscrews from the side of the measuring head and set aside. Grasp
the body of the instrument, under the shoulder, in one hand and the venturi in the other. Gently
pull the two sections apart. Avoid any pulling force to the Gill Screen. Set aside the upper section
of the measuring head with the Gill screen attached and you are left with the venturi body shown in
Figure 7. Rinse the entire venturi body in warm soapy water. Any deposits, which are not floated
away, may be removed externally with a soft cloth. If internal deposits are not removed by soaking,
the best procedure is to immerse the unit in an ultrasonic bath containing soapy water. If an
ultrasonic bath is not available, judicious use of a pipe cleaner is recommended.
Following cleaning, the venturi may be dried utilizing compressed air, or if not available, allowed to
air dry. Be especially certain to blow all liquid out of the pressure taps and their attendant
passages.
Inspect the silicone rubber “O” rings on each pressure tap. If any damage is observed, replace all
four. Prior to reassembly, lubricate the “O” rings with a wipe of light grease. Prior to reinstalling
the venturi into the body of the instrument, note that there is only one rotational position in which
both the pressure taps and the three screw holes on the body can be aligned. Hence, incorrect
assembly is impossible. Having ascertained the correct rotational position for reassembly, gently
insert the venturi section into the recess, until the tips for the pressure taps bottom. Rotate the
venturi section gently back and forth (clockwise/counterclockwise) until the tips of the pressure taps
go into the recesses provided. Slide the venturi longitudinally, back and forth until the three screw
holes line up and reinstall the three thumb screws, hand tight.
The two “O” rings in the socket of the instrument, which fits over the 12 inch down tube, during
calibration procedures, should be frequently inspected for wear and tearing. They should be
replaced at the first sign of wear and always kept lightly greased for ease of use.
9.0 Safety
There are no owner serviceable components in the measuring head of the instrument other than the
venturi and “O” rings described in the previous section. The only user serviceable items in the
14
electronic control module are the four AA batteries. These should only be replaced with good quality
alkaline energy cells and should be promptly removed when expired, to prevent leakage and
chemical damage to the electronic components. When the instrument is placed in long term storage
(more than two months) always remove the batteries.
Do not substitute other power supplies. Use only the unit provided, or severe electrical problems will
occur.
Even though there is no reason to disassemble the electronics box, should the need arise, always
unplug the line current power supply (if it is in use) and remove the batteries.
Adjustable potentiometers are contained within the electronic housing, which are factory set during
calibration. If these are turned, the calibration will be lost and factory recalibration will be required.
The filter temperature probe has a range of –50° to +50° C, its accuracy is as indicated on the
traceability certificate and it is not recommended that it be utilized outside of the normal EPA range
(-30° to 40° C) for which it is intended. The tip of the probe should not be applied to surfaces
above 50° C, as it will be irreparably damaged. Under no circumstances should it be inserted into
any area, which might cause damage to the probe or that the probe might cause damage to.
10.0 Warranty Information
BGI Incorporated warrants equipment of its manufacture and bearing its nameplate to be free from
defects in workmanship and material. We make no warranty, express or implied, except as set
forth herein. BGI's liability under this warranty extends for a period of one (1) year from the date
of BGI's shipment. It is expressly limited to repairing or replacing at the factory during this period
and at BGI's option, any device or part which shall within one year of delivery to the original
purchaser, be returned to the factory, transportation prepaid and which on examination shall in fact
be proved defective.
BGI assumes no liability for consequential damages of any kind. The purchaser, by acceptance of
this equipment, shall assume all liability for consequences of its misuse by the purchaser, his
employees or others. This warranty will be void if the equipment is not handled, installed, or
operated in accordance with our instructions. If damage occurs during transportation to the
purchaser, BGI must be notified immediately upon arrival of the equipment. The Equipment will be
returned via collect shipment.
A defective part in the meaning of this warranty shall not, when such part is capable of being
repaired or replaced, constitute a reason for considering the complete equipment defective.
Acknowledgment and approval must be received from BGI prior to returning parts or equipment for
credit. BGI Incorporated makes engineering changes and improvements from time to time on
instruments of its manufacture. We are under no obligation to retrofit these improvements and/or
changes into instruments which have already been purchased.
No representative of ours has the authority to change or modify this warranty in any respect.
15
Appendix A. NIST Traceability
A1.0 Introduction
NIST traceability for the deltaCal is established with the use of devices which are of themselves
traceable and for which, BGI holds current traceability certificates. Calibrations are performed
under a set of ISO 9000-2000 procedures, subject to annual audit. During a flow rate
calibration, the room temperature is established with an ASTM certified/traceable thermometer.
Barometric pressure and absolute pressure are established with electronic manometers. These
are backed by three Primary Standard Mercury Instruments/
A2.0 Flow Rate Calibration
A schematic diagram of an instrument undergoing flow rate calibration is shown in Figure 1A. Two
traceable critical Ventura are utilized for this purpose. Their details are listed on the calibration
certificate. Readings of flow rate are taken as shown in Figure A2, which is a typical calibration. While
the deltaCal utilizes barometric pressure and ambient temperature to constantly display readings of
volumetric flow rate, the initial venturi calibration is performed and normalized to a base value. While
any values are sufficient, “engineering standard values” of 20° C and 760mm of Hg have been selected.
Utilizing an Excel spreadsheet, the flow rate vs. pressure drop equation for the individual venturi under
test is determined. This equation is then installed in the individual unit’s microprocessor.
A3.0 Barometric Pressure Calibration
The barometric pressure sensor is set to match the actual current barometric pressure as
determined by a Mercury barometer. A negative pressure of 150 mm of Hg is applied to the
barometric pressure transducer and the output reading is adjusted to comply with BP – 150mm.
A4.0 Temperature Calibration
The Thermistors provided for measurement of ambient and filter temperature are of a very high
standard and are batch tested at the temperature extremes of –20° C and +50° C, utilizing an
ASTM certified/traceable thermometer as a reference.
16
DIGITAL TEMPERATURE
VACUUM
PUMP
20° C
MERCURY
BAROMETER
TRACABLE
CRITICAL VENTURI
MERCURY
MANOMETER
VENTURI PRESSURE DROP
MANOMETER
deltaCal
VENTURI
CONTROL
VALVE
Figure A1- Schematic Diagram of Calibration Setup
2172
17
A5.0 Recalibration
Recalibration is immediately necessary if physical damage has occurred to such an extent that
the instrument is rendered inoperable. In such cases, an instrument will be recalibrated as part
of the repair procedure. There are no moving or wear parts in the instrument, therefore, baring
physical damage, there is no reason for recalibration, except as required by ISO, company or
regulatory requirements. These requirements are almost universally on a one-year basis, after
being placed in service. Units received for recalibration will be thoroughly inspected and any
requisite repairs will be performed prior to recalibration.
Appendix B. Use of the deltaCal with non-volumetric samplers.
[NOTE: If your instrument is Version 2.5.X or higher, ignore this section and go to Appendix
D]
The flow measurement function of the deltaCal is designed to check the flow rate of “true” volumetrically
flow-controlled instruments. A truly volumetric flow controlled instrument is one, which is constantly
taking account of ambient pressure and temperature. Air sampling instruments of this type are largely
limited to those devices originally designed for EPA 2.5 Designated sampling. Mass flow controlled
instruments are frequently utilized for air sampling, because of their extreme stability. There are two
types of mass flow controllers. The older type contains a heater and thermistor. This type is referred to
as “Anemometric”, as this is what is used in a hot wire anemometer. An example of this type is the
mass flow controlled high-vol sampler. This systems flowrate, is altered by the density of the air,
(barometric pressure and ambient temperature). This system has been supplanted by true mass flow
sensor (thermistor-heater-thermistor)3. This system is not affected by variations in air density. Once
the flow rate is set, the mass of air flowing through the instrument is constant. An example of a modern
type of mass flow controlled air sampler is the BGI PQ100. In some areas of the United States and in
most of the world it is recognized that what is referred to as mass flow is more properly called Standard
Flow, i.e. flow or volume corrected to a specified set of standard conditions.
Since a true mass flow controlled sampler must be set, upon calibration to a user selected barometric
pressure and temperature, the deltaCal may be utilized on instruments of this type. A simple calculation
will be necessary to determine if a mass flow controlled instrument is operating correctly. This
calculation is shown in the following illustrative example.
Set conditions of instrument
Set flow rate:
Reference Temp:
Reference BP:
16.7 Lpm
20° C
760 mm of Hg
True flow rate through sampler= Qind (Tcal/Tind) x (BPind/BPcal)
When the deltaCal indicated readings are: Temp. (Tind) = 3C; BP (BPind) = 730 mm of Hg and Q = 16.4
Then the mass flow rate at the set conditions is = 16.4 (20 + 273.18)/(3 + 273.18) x (730)/(760) =
16.7 lpm
Thus, it has been shown that the audited flow rate through the air sampler is within 0% of the set mass
flow rate. This same relationship can be used to audit at any set of condition within the range of the
deltaCal.
Alternatively, a precalculation may be made and the deltaCal may be used to calibrate a mass flow
controlled air sampler. Desired set conditions of the air sampler.
Set flow rate:
Reference temp:
Reference BP:
16.7 Lpm
0° C
760 C
Conditions in area where calibration is being performed,
Ind. Temp:
Ind. BP:
18° C
770 mm of Hg
The air sampler must be adjusted so that the flow rate indicated on the deltaCal is equal to:
= 16.7(Tind/Tcal) x (BPcal/BPind)
= 16.7 (18 + 273.18)/( 0 + 273.18) x (760)/(770) = 17.57 Lpm
Other, semi-volumetric air sampling devices may also be calibrated by this technique utilizing the
deltaCal. Examples of semi-volumetric flow controlled instruments are those which utilize a critical
orifice for flow control or keep the flow constant by measuring some function of flow rate and adjust
pump speed to keep flow rate approximately constant. These devices do not adjust for the density of
the air and are generally accepted to maintain a set flow rate at +5%, when used indoors.
Appendix C. Venturi Changes
Instruments with version numbers beginning with 2.4.X have a new Venturi with a slight dimensional
change. These units are further identified by a grove running around the Venturi body, which is always
fabricated from Aluminum. The flow rate range has been shifted from the original 2-20 lpm to 1.5 to
19.5 lpm. The purpose of this change is to accommodate a revived interest in Dichotomous particulate
samplers. These samplers require a measurement capability at 1.67, 15 and 16.7 lpm. This is a
permanent change applied to all deltaCals produced from approximately the beginning of 2007,
onwards.
Appendix D. Expanded Firmware
Instruments with version numbers beginning with 2.5.X onwards have had their utility expanded with a
major change to their firmware. In order to understand and utilize these changes it is necessary to
present a more comprehensive explanation of the differences between Standard and Actual flow rate
than was previously presented.
There are two ways that practitioners of air sampling measure and talk about flow rate.
Those doing compliance sampling for Industrial Hygiene/Occupational Health speak of Volumetric or
Actual Air Flow rates. It is the volume of air at the existing pressure and temperature at the sampling
site. The US EPA also specifies this type of measurement for PM2.5. Electronic meters of the bubble,
piston, venturi and orifice type “read out” in volumetric flow rate or QA. There are exceptions which do
both.
EPA, for Politico Legal, reasons uses QS known as Standard Air flow rate for reporting PM10. This means
that the flow rate is reported to Standard conditions. For the US EPA, these conditions are 25° C and 1
atmosphere pressure. (1 Atmosphere = 760 mm of Hg = 29.92 in of Hg = 1013.25 millibars = 1013.25
hecto Pascals).
Because the mass of air flowing could be calculated from QS it has come to be called Mass flow.
Throughout most of the world QS is not usually referred to as mass flow and it is to a different standard.
The conditions outside of the U.S. are 0° C and 1013.25 mb.
19
Volumetric devices are in the majority and any of them may be used to measure QS if there is also
knowledge of the T and BP, in the immediate locale, either from the instrument itself or supplemental
instruments.
QS = Qa * (BPa/760)*(298.15/Ta+273.15) For U.S. applications when Ts=25° C and BPs=760 mm of Hg
QS = Qa * (BPa/1013.25)*(273.15/Ta) For world applications when Ts=0° C and BPs=1013.25 mb
Inasmuch as the deltaCal generates Qa, Ta and BP information on a continuous basis it was decided in
mid 2006 to implement new code which would provide both Qa and Qs information. At the same time,
the two most popular Barometric pressure units (mm of Hg and millibars or hecto Pascals) are also
provided. This results in two new screens;
BP in hecto Pascals
(millibars)
BP in mm of Hg
BP : 7 6 0 mm 1 0 1 3 mb
Ta :22. 8
Tf:22.4
Qa : 10. 02LPM
Ext
Qs : 10. 10LPM
pwr
Actual Flow Rate at Local BP and T Ambient
Power Supply
is Plugged In
Filter Temp. Probe
Ambient Temp.
BP : 7 6 0 mm 1 0 1 3 mb
Ta :22. 8
Tf:22.4
Qa : 10. 02LPM Bat t
Qs : 10. 10LPM 100%
Standard Flow Rate
(Actual Corrected to Standard Conditions)
Running on
Battery Power
3041
Remember, Qs is always set to sea level conditions, but the Standard temperature is always factory set
to either 25° C (US EPA, Canada and other countries using US EPA conditions) or 0° C. If the Firmware
version contains the letter W (for world) the temperature base is 0° C.
20
Appendix E. P Series Setup.
All calibrators with the letter P in the Version number of the start up screen are equipped with user
selectable display parameters.
All units are shipped from the factory with the following default parameters installed:
B
T
Q
P
a
a
:
:
:
7
2
1
6
4
6
0
.
.
.
8
6
0
°
7
Q
s
:
1
6
.
7
2
m
m
H
g
C
L
P
M
B
a
t
t
L
P
M
1
0
0
%
A utility disc is shipped with every new/recalibrated/repaired unit which will permit the selection of a
wide range of measurement units. The Utility is known as BGIOpenCal It may be downloaded directly to
your computer from the electronic version of this manual, or from the BGI web site on the page
describing the calibrator. An icon will be created and displayed on your desktop:
Clicking on this icon will open a BGIOpenCal Set up screen. In order for the screen to be active your
calibrator must be connected to your computer via a serial cable or in most cases today via a USB serial
cable of good quality.
21
If the connection is successful, a green box and the number of the com port will be displayed. You will
also see the details of your calibrator:
In the event that a com port is not automatically selected, select :
Click on it to go to:
22
If there is no com port displayed, set the cursor on the down arrow
and a number will be displayed. Click on
and you are connected.
In the future when the same calibrator is connected to the same computer a port connection will be
instantly established. You may now select:
Clicking on this icon will open the parameter selection area and permit a wide variety of measurement
units to be displayed. The initial display will be the factory default values.
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Five choices of units of pressure are available. In the order presented they are:
mmHg - millimeters of Mercury
inHg - inches of Mercury
kPa - kilo Pascals
Atm - Atmospheres
mb - Millibars
At this point it is important to note that these parameters may all be changed while air is
flowing through the instrument. This is a useful feature as it may aid the investigator to achieve a
better "feel" for the most favorable units to utilize.
Three choices of units of Temperature are available:
ºC - Celsius
ºF - Fahrenheit
ºK - Kelvin
Five choices of flow rate units are available:
LPM - Liters per minute
CMM - Cubic meters per minute
CCM - Cubic centimeters per minute
CFM - Cubic Feet per minute
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MPM - Moles per minute
The reference temperature is the "base" to which the Standard flow rate is presented. In the USA and
other counties which directly utilize EPA guidelines (principally all of the Western hemisphere bar
Canada) the Standard temperature is 25º C for PM 10. Foe the rest of the World the "base" is 0º C.
Engineers and NIST use a base of 20º C when expressing Standard flow rate. At one time it was popular
to refer to standard flow as mass flow. This was common but, incorrect and is rapidly fading.
button and unplug the cable.
Once your selections have been made, press the
References
1.
2.
3.
Fan Engineering, R. Jorgensen, ed. Buffalo Forge Co, Buffalo, NY. 6th Ed. 1961.
US EPA FRM 40 CFR Part 53, Federal Register, July 18, 1997.
Measurement Systems, E.O. Doeblin, McGraw-Hill Inc., New York, NY. 4th Ed. 1990.
Revision History
Version 1.1.2
First public release
August 2000
Version 1.1.3
Minor revisions
April 2001
Version 1.2
Revised calibration procedure
January 2002
Version 1.3
Added tolerances to specification page
July 2003
Version 1.4
Changed software to Version 1.4
October 2002
Version 1.4.1
Changed software to Version 1.6.1
July 2004
Version 1.4.2
Added 7.4.3 Troubleshooting
November 2004
Version 1.5.0
Detail improvements, added appendix C & D
March 2007
Version 1.5.1
Minor corrections
April 2007
Version 1.6.1
Introduced BGI Open Software
January 2008
Version 1.6.2
Updated ISO Registration
March 2009
Version 1.6.3
Updated Figure 7
June 2009
Version 2.0.0
Firmware revision
July 2011
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