Met One Instruments Swift 25.0 User manual

OPERATION MANUAL
Met One Instruments, Inc.
1600 NW Washington Blvd.
Grants Pass, OR 97526
Telephone: [phone]
Facsimile: [phone]
metone.com
Swift 25.0
Flow Meter
Swift 25.0-9800
Rev A

Met One Instruments, Inc. is now part of the Acoem international group
of companies.
Met One Instruments has been designing and manufacturing
class-leading meteorological, ambient air sensing, and air quality
monitoring instrumentation since its inception in 1989. Its line of robust
industrial-grade meteorological equipment, air particulate monitoring
equipment, and indoor air quality monitoring systems have set the
standard for the industry. Headquartered in Grants Pass, OR, Met One
Instruments, Inc. is fueled by a dedicated expert team who is diligently
working to advance the technology required to ensure continued
improvements in human and environmental health now and for
generations to come.
Acoem is committed to helping organizations and public authorities
nd the right balance between progress and preservation —
safeguarding businesses and assets and maximizing opportunities
while conserving the planet’s resources. Headquartered in Limonest,
France, Acoem delivers unrivaled inter-operable AI-powered sensors
and ecosystems that empower our customers to make enlightened
decisions based on accurate and timely information.
In 2021, Acoem acquired Met One Instruments, marking a pivotal
moment when two industry leaders in the air quality monitoring sectors
converged — creating a single, stronger and more future-focused
provider of holistic environmental monitoring solutions. Now, Met One
Instruments Powered by Acoem has opened new possibilities through
an extensive oering of class leading, multi-parameter environmental
monitoring and industrial reliability solutions. These integrated
measurement systems, technologies, and services deliver
comprehensive solutions for a range of applications, including
environmental research, regulatory compliance, and industrial safety
and hygiene.
For more information about Met One Instruments Powered by Acoem,
please visit: metone.com
For more information about Acoem, please visit: acoem.com
Swift 25.0 Operation Manual - © Copyright 2023 Met One Instruments, Inc. All Rights Reserved worldwide. No
part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated
into any other language in any form without the express written permission of Met One Instruments, Inc.
Page 2 Swift 25.0-9800 Rev A

Swift 25.0-9800 Rev A Page 3
Table of Contents
1. INTRODUCTION ..................................................................................7
1.1 About This Manual ........................................................................................... 7
1.2 Technical Service ............................................................................................ 7
1.3 Swift 25.0 Flow Meter ......................................................................................8
1.4 Swift 25.0 Specifications .................................................................................9
2. UNPACKING....................................................................................... 11
2.1 Shipment Contents.......................................................................................... 11
2.2 Charging the Swift 25.0 ................................................................................. 12
3. FUNCTIONS AND CONFIGURATIONS.................................................. 13
3.1 Multifunction Button....................................................................................... 13
3.1.1 Power........................................................................................................................... 13
3.1.2 Data Capture .............................................................................................................. 13
3.1.3 Bluetooth ..................................................................................................................... 14
3.2 Function Test................................................................................................. 14
3.3 User Interface Display .................................................................................... 14
3.3.1 Status Bar - Battery Life Icon .................................................................................... 16
3.3.2 Status Bar - Bluetooth Icon........................................................................................ 16
3.3.3 Flow Rate Measurement............................................................................................. 16
3.3.4 Barometric Pressure Measurement ........................................................................... 16
3.3.5 Temperature Measurement........................................................................................ 16
3.3.6 Relative Humidity Measurement .................................................................................17
3.4 Inlet Cap.........................................................................................................17
3.5 Outlet Fitting ................................................................................................. 18
3.6 Electrical Connections ................................................................................... 18
3.7 USB Driver Configuration................................................................................ 19
3.8 Configuration Software.................................................................................. 19
3.8.1 Date and time.............................................................................................................. 19
4. OPERATION ......................................................................................20
4.1 Installation ....................................................................................................20
4.1.1 Bluetooth Antenna ......................................................................................................22
4.1.2 Temperature Probe.....................................................................................................22
4.2 Data Collection..............................................................................................23

Page 4 Swift 25.0-9800 Rev A
4.3 Connecting to a SASS or other instrument with tubing......................................23
4.4 Audit Sheet....................................................................................................23
4.5 Storing the Swift 25.0 ....................................................................................23
5. MAINTENANCE AND TROUBLESHOOTING ......................................... 24
5.1 Recommended Periodic Maintenance Table ....................................................24
5.2 Inlet Screen Cleaning .....................................................................................24
5.2.1 Disassembly ................................................................................................................25
5.2.2 Inspection and cleaning..............................................................................................25
5.3 Basic Problem and Cause/Solution Table ........................................................26
5.4 Coin Cell Battery Replacement ....................................................................... 27
5.4.1 Back Panel Removal ...................................................................................................27
5.4.2 Remove Main Battery .................................................................................................28
5.4.3 Remove Battery Tray..................................................................................................28
5.4.4 Replace the Coin Cell Battery................................................................................... 29
6. SPARE PARTS AND ACCESSORIES.................................................... 30
6.1 Consumables, Replacement Parts, and Accessories ........................................30
7. SWIFT UTILITY SOFTARE .................................................................. 31
7.1 Menu Bar ....................................................................................................... 31
7.1.1 File Tab ........................................................................................................................ 31
7.1.2 About ........................................................................................................................... 31
7.2 Establishing a Connection ..............................................................................32
8. USER INTERFACE ..............................................................................33
8.1 Device Info and Settings.................................................................................34
8.1.1 Get Button .................................................................................................................. 34
8.1.2 Set Button................................................................................................................... 34
8.2 User settings .................................................................................................34
8.2.1 Temperature Units ..................................................................................................... 34
8.2.2 Pressure Units............................................................................................................. 35
8.2.3 Flow Units ................................................................................................................... 35
8.2.4 Advanced ................................................................................................................... 35
8.3 Download Data..............................................................................................36
8.3.1 All Button .................................................................................................................... 36
8.3.2 From Button................................................................................................................ 36
8.4 Clear Memory ................................................................................................ 37

Swift 25.0-9800 Rev A Page 5
8.5 Date and Time ............................................................................................... 37
8.5.1 Set Clock .....................................................................................................................37
8.5.2 Set From ......................................................................................................................38
8.6 Zero Flow ......................................................................................................39
8.7 History ..........................................................................................................39
9. SWIFT BLUETOOTH APPLICATION ................................................... 40
10. FLOW AUDIT SHEET ......................................................................... 40
Table of Figures
Figure 1-1 Swift 25.0 Flow Meter ..........................................................................................................8
Figure 2-1 Standard Components for the Swift 25.0...........................................................................12
Figure 3-1 Swift 25.0 Front View.........................................................................................................13
Figure 3-2 Swift 25.0 User Interface ...................................................................................................15
Figure 3-3 Inlet Cap Screen................................................................................................................17
Figure 3-4 Swift 25.0 Bottom View......................................................................................................18
Figure 4-1 Flow measurements on UUTs with standard 1.25” O.D. inlet ............................................21
Figure 4-2 Bluetooth Antenna .............................................................................................................22
Figure 4-3 Temperature Probe............................................................................................................22
Figure 4-4 Connection to a SASS with Tubing Adaptors ....................................................................23
Figure 5-1 Inlet Assembly ...................................................................................................................24
Figure 5-2 Inlet Assembly ...................................................................................................................25
Figure 5-3 Back Panel Removal .........................................................................................................27
Figure 5-4 Battery Removal ................................................................................................................28
Figure 5-5 Battery Tray Removal ........................................................................................................28
Figure 5-6 Coin Cell Battery................................................................................................................29
Figure 5-7 Reassembly.......................................................................................................................29
Figure 7-1 File Tab..............................................................................................................................31
Figure 7-2 About Screen.....................................................................................................................31
Figure 7-3 Start Screen.......................................................................................................................32
Figure 8-1 Main Screen ......................................................................................................................33
Figure 8-2 Device and Settings...........................................................................................................34
Figure 8-3 Get Button .........................................................................................................................34
Figure 8-4 Get and Set Buttons ..........................................................................................................34
Figure 8-5 Temperature Units.............................................................................................................34
Figure 8-6 Pressure Units ...................................................................................................................35
Figure 8-7 Flow Units..........................................................................................................................35
Figure 8-8 Advanced...........................................................................................................................35

Page 6 Swift 25.0-9800 Rev A
Figure 8-9 Download Data Options.....................................................................................................36
Figure 8-10 Clear Memory ..................................................................................................................37
Figure 8-11 Clear Memory Prompt......................................................................................................37
Figure 8-12 PC Time Prompt ..............................................................................................................37
Figure 8-13 Date and Time Settings ...................................................................................................37
Figure 8-14 Date Dropdown Menu......................................................................................................38
Figure 8-15 Select Time Prompt .........................................................................................................38
Figure 8-16 Zero Flow.........................................................................................................................39
Figure 8-17 Zero Tare Prompt ............................................................................................................39
Figure 8-18 History Panel ...................................................................................................................39
Table of Tables
Table 1-1 Swift 25.0 Specifications.....................................................................................................10
5-1 Preferred Maintenance Period......................................................................................................24
Table 5-2 Trouble Shooting Cause and Solutions...............................................................................26
Table 6-1 Parts and Accessories ........................................................................................................30

Swift 25.0-9800 Rev A Page 7
1. INTRODUCTION
1.1 About This Manual
This document is organized with the most important information toward the front of the
manual. All users should read and understand the sections on setup, operation, and field
audits. Toward the back are sections that provide in-depth information on subjects such as
diagnostics and accessories. These sections should be consulted as needed.
1.2 Technical Service
Should support still be required after consulting the documentation, contact one of the
expert Met One Instruments, Inc. Technical Service representatives during normal business
hours of 7:00 a.m. to 4:00 p.m. Pacific Time, Monday through Friday. In addition, technical
information and service bulletins are often posted on our website. Please contact us and
obtain a Return Authorization (RA) number before sending any equipment back to the
factory. This allows us to track and schedule service work and to expedite customer
service.
Contact
Information:
Tel: + 541 471 7111
Fax: + 541 471 7115
Web:http://www.metone.com
Email:serv[email protected]
Address:
Met One Instruments, Inc.
1600 Washington Blvd
Grants Pass, Oregon
97526 U.S.A.
Please have the instrument serial number available when contacting the manufacturer. On
most models manufactured by Met One Instruments, it will be located on a silver product
label on the unit and printed on the calibration certificate. The serial number will begin with
a letter and be followed by a unique five-digit number such as U15915.

Page 8 Swift 25.0-9800 Rev A
1.3 Swift 25.0 Flow Meter
The Met One Instruments, Inc. Model Swift 25.0 is a multi-function Flow Meter specifically
designed for accurate flow measurements from 2.0 to 25.0 liters per minute (LPM). The
device’s easy-to-read display shows Flow Rate, Flow Temperature and Ambient Pressure.
Flow measurements are traceable to NIST standards, and a certificate of calibration is
provided with each unit. The Swift 25.0 comes complete with a portable carrying case, flow
adapters and a USB-C charging cable.
Figure 1-1 Swift 25.0 Flow Meter

Swift 25.0-9800 Rev A Page 9
1.4 Swift 25.0 Specifications
PARAMETER
SPECIFICATION
Flow Range
2 to 25 LPM
Flow Accuracy
±1% of reading to -10°C
Display Resolution (Flow)
0.01 LPM
Flow Units
LPM (Liters Per Minuet) or SLPM (Standard Liters Per Minuet)
Barometric Pressure Range
400 - 900 mmHg (533 – 1200 mbar)
Barometric Pressure
Accuracy
± 1.125 mmHg (± 1.5 mbar) @ 25°C 750 mmHg
± 1.875 mmHg (± 2.5 mbar) error band between -20°C to 85°C
Standard Conditions
25°C and 101.3 kPa
Display Resolution (Pressure)
0.1 mmHg (0.133 mbar)
Pressure Units
mbar, mmHg, kPa, inHg or Pa
Pressure Drop
7 mmHg @ 25 LPM
Temperature Accuracy
± 0.2°C
Temperature Probe Accuracy
± 0.2°C
Temperature Resolution
0.01°C/°F
Temperature Units
°C or °F
Relative Humidity Range
0 to 100% RH non-condensing
Relative Humidity Accuracy
±3.5% RH
Data Storage Capacity
200 records, snapshot method utilizing power button
Electrical
DC Power
5 VDC, 500 mA max
Charging
USB-C
Serial
USB-C
Battery
Internal 3.7V, 2000mAh (7.4Wh) Lithium-ion battery
Battery Life
35 hours
Software
Driver
CP210X (MS Windows only)
Software
Swift Utility software (MS Windows only)
Bluetooth App
In development, instrument is Bluetooth ready
Interface
Display
Black on White, Backlit, Sunlight Readable, 320 x 154 Resolution
Display Parameters
Flow Rate: LPM or SLPM
Barometric Pressure (ambient): mbar, mmHg, kPa, inHg or Pa
Temperature: °C or °F, in flow or external if probe is plugged in
Relative Humidity (ambient): %
Average Flow Rate: units will follow Flow units.
Battery Level and Charge Status
Bluetooth connection

Page 10 Swift 25.0-9800 Rev A
Physical
Weight 19.8 oz. (561g)
Size 4 in. wide x 6.1 in. height x 1.35 in. depth (10.6 cm x 15.5 cm x 3.4 cm)
Outlet Fitting Size 1.25” I.D (31.75 mm) slip on with O-ring seal
Case Size 13" x 11.4" x 5.5" (33 cm x 29 cm x 14 cm)
Environmental
Operating Temperature Range -20°C to +50°C
Operating Humidity 0 to 100% Non-condensing
Water Resistance Enclosure is water resistant. Connections are IP67 rated.
Specifications may be subject to change without notice.
Table 1-1 Swift 25.0 Specifications

Swift 25.0-9800 Rev A Page 11
2. UNPACKING
Before operating the Swift 25.0 for the first time, it is recommended to fully
charge the flow meter using the included USB cable.
Use the following information to correctly assemble, configure, and deploy the Swift 25.0
Flow Calibrator. There are no special precautions or handling concerns except for the
normal level of care required for handling scientific equipment. Refer to the instructions and
diagrams on the following pages.
When unpacking the Swift 25.0 flow meter and accessories, compare them to the check off
list below to make sure all items are present.
Any damage incurred to the equipment during shipping is the responsibility of the carrier. If
any damage to the shipment is noticed before unpacking, a claim must be filed with the
commercial carrier immediately. Follow any special unpacking instructions provided by
the carrier as all items are carefully removed from the containers and each component
inspected. It is recommended to document and photograph all damaged packages and
items before, during, and after unpacking them. Contact Met One Instruments (see section
1.2 of this manual) to arrange for any replacement items needed.
2.1 Shipment Contents
The normal instrument configuration is supplied with the following standard components
and accessories:
Swift 25.0 Flow Meter Check Off List
Operator's Manual
Calibration Certificate (NIST)
Ambient Temperature Probe
Temperature Probe Cable Clip
Bluetooth Antenna (for future use with mobile app)
Flow Adapter: for 3/8" I.D. tubing (SASS Application)
Black EDPM Tubing- 4’ (1.22 m) of 1/4” I.D x 3/8” O.D. (6.35 mm I.D x 9.53 mm O.D.)
USB Cable
Carrying Case
Software & Driver Available at metone.com
The standard components for the Swift 25.0 are shown in Figure 2-1.

Page 12 Swift 25.0-9800 Rev A
Figure 2-1 Standard Components for the Swift 25.0
Please keep all the special shipping items (box, foam packing material, etc.) used to ship
the Swift 25.0. They should be reused if the Swift 25.0 is to be transported (changing site
locations, returning to the factory, etc.). Contact Met One Instruments (see section 1.2 of
this manual) for replacement packing materials if necessary.
2.2 Charging the Swift 25.0
The battery is charged using the included USB cable.
1. Insert the USB-C end (small oval plug) into the Swift 25.0 on the bottom left side of
the unit.
2. The USB-A end (rectangle plug) can connect to standard USB port or to a standard
110V wall outlet by using a USB wall adapter such as a cell phone charging box (not
supplied).
See Section 3.3.1 Status Bar - Battery Life Icon for more information.

Swift 25.0-9800 Rev A Page 13
3. FUNCTIONS AND CONFIGURATIONS
Figure 3-1 Swift 25.0 Front View shows the Multifunction Button, User Interface Display,
Inlet Cap and Outlet Fitting.
Figure 3-1 Swift 25.0 Front View
3.1 Multifunction Button
The Multifunction Button shown in Figure 3-1 performs the functions in the sections below.
3.1.1 Power
•Press the power button once to turn the power on.
•Press and hold down the power button for five seconds to turn the power off.
IMPORTANT:Be sure to allow at least ten seconds for the Swift 25.0 to complete the
power-on cycle and initialization before mating it to a flow inlet.
3.1.2 Data Capture
•Press the power button once to save all displayed data along with the date and time
while the instrument is powered on. A Page Icon will appear at the top of the display
indicating a screenshot is being saved. When saved, the page icon will disappear.
See section 3.8 Configuration Software for data retrieval.
NOTE: Data is stored in a rotational buffer of 200 records with first in first out,
meaning when the 200 records are full, the first record is deleted when the next
record is stored. Data is retained when the unit is powered off.
Inlet Cap
Outlet Fitting
Multifunction/po
wer Button
User
Interface
Display

Page 14 Swift 25.0-9800 Rev A
3.1.3 Bluetooth
•When the Swift 25.0 is first powered on, and the Bluetooth antenna installed, a
Bluetooth signal will begin broadcasting. The signal broadcast is indicated by the
blinking Bluetooth icon found in the status bar (see section 3.3.2 Status Bar -
Bluetooth Icon).
•When the Bluetooth icon is solid (no longer blinking), a Bluetooth connection has been
established with a mobile device.
•The Bluetooth signal will only broadcast for six minutes if a connection is not made.
After six minutes the signal will end, and the icon will disappear from the status bar.
•To start the Bluetooth signal broadcast again, press the power button twice in quick
succession. The Icon will begin to blink for another six minutes or until a connection is
made with a mobile device.
3.2 Function Test
Before operating the Swift 25.0 for the first time, it is recommended to fully charge the
flow meter using the included USB cable.
Complete the following steps to verify proper operation.
1. Press the Power button to turn on the power.
2. Observe the Met One Instruments, “Powered by Acoem” startup screen for three
seconds, then the Product Model and Firmware screen for three seconds, the Operate
screen will then appear.
3. Hold the Power button for five seconds to power down the flow meter.
4. Unit is ready for use.
3.3 User Interface Display
The user interface display is shown in Figure 3-2. The display’s back light is always on with
one fixed level of intensity. The display is direct sunlight readable. The user interface
contains the following readings in order from top to bottom:
•The status bar contains the battery life indicator, Bluetooth connection status and
screenshot Icon.
•Flow rate in liters per minute (LPM) or standard liters per minute (SLPM)
•Barometric pressure in mbar, mmHg, kPa, inHg, or Pa
•Temperature in °F or °C.
•Relative humidity (RH) in %.
•Average Flow. Averaged over 10 seconds.
NOTE:The Engineering units of measurement can be changed for user preference
using the Swift Utility software. (Reference Swift Utility software manual.) Example:
Fahrenheit to Celsius

Swift 25.0-9800 Rev A Page 15
Figure 3-2 Swift 25.0 User Interface
Status Bar
Battery
Status
Bluetooth
Flow Value
Barometric
Pressure
Value
Temperature
value
Relative
Humidity
value
Average
Flow value

Page 16 Swift 25.0-9800 Rev A
3.3.1 Status Bar - Battery Life Icon
The battery life icon is located in the status bar at the top of the
display. Charging is indicated by three strobing bars within the battery
icon. A completely discharged battery will fully charge in
approximately eight hours. Battery life is roughly measured in 33%
increments with each bar. As battery life depletes, the bars will
disappear, one at a time.
NOTE: It is recommended that the battery be fully charged before operating the Swift 25.0
for the first time.
3.3.2 Status Bar - Bluetooth Icon
The Bluetooth icon is located in the status bar, next to the battery life icon,
at the top of the display. It is an antenna symbol that will flash when
advertising a signal. The broadcast name is “Swift 25”. Connect the Swift
25.0 to a mobile device using the Swift Bluetooth mobile application. The
application will be available for both Apple and Android devices.
Refer to the Swift Bluetooth application manual for more information.
3.3.3 Flow Rate Measurement
Flow rate is reported on the first line of the display, below the status bar (See Figure 3-2).
Ambient temperature, barometric pressure, and relative humidity are used are used to
calculate the flow rate.
Default flow rate units are liters per minute (LPM). Displayed flow rate measurement units
can be changed from volumetric liters per minute (LPM) to standard liters per minute
(SLPM) using the Swift Utility software or Swift Bluetooth app described in their respective
manuals.
The manuals and Swift Utility software can be downloaded at metone.com under the
support tab. If assistance is needed, please contact the service department.
3.3.4 Barometric Pressure Measurement
Barometric pressure readings reported on the second line of the display. The reading comes
from an independent pressure sensor, not in the flow path.
Default pressure units are mmHg. Displayed pressure units can be changed to mbar, inHg,
mmHg, Pa, or kPa using the Swift Utility software or Swift mobile application.
3.3.5 Temperature Measurement
Temperature readings are reported on the third line of the display. Temperature readings
are measured either from the flow chamber or from the external probe when attached.
Airflow must pass through the unit to obtain an accurate temperature reading when no
probe is attached. The measurement source will automatically switch to the external probe
when plugged in.

Swift 25.0-9800 Rev A Page 17
Flow chamber temperature readings may be affected by external factors.
Default temperature units are Celsius (°C). Displayed temperature units can be changed to
Fahrenheit (°F) using the Swift Utility software or Swift mobile application.
3.3.6 Relative Humidity Measurement
Relative Humidity is displayed on the fourth line of the display. The reading comes from an
independent sensor, not in the flow path. The units are displayed as a percentage (%).
3.4 Inlet Cap
Figure 3-3 shows the Swift 25.0 Inlet Cap assembly. It is designed to allow airflow through
the inlet but prevent rain and debris from damaging the internal sensors. The inlet cap is a
two-piece assembly which houses a mesh screen to prevent debris and bugs from entering
the device. See section 5.2 Inlet Screen Cleaning for disassembly and maintenance.
Figure 3-3 Inlet Cap Screen
Caution: Do not carry the instrument by the Inlet Cap or the Outlet Fitting. They are held
in place by the friction of O-rings and could come loose.

Page 18 Swift 25.0-9800 Rev A
3.5 Outlet Fitting
Figure 3-1 shows the location of the Swift 25.0 outlet fitting which is designed to fit on the
down tube of the ambient air monitor equipment with 1.25” (31.75 mm) outer diameter
(O.D.) inlets, the standard size of Met One Instruments, Inc. BAM monitors. The flow
calibrator can be used on FRM and FEM ambient air samplers including these Met One
Instruments, Inc products:
• BAM 1020
• BAM 1022
• E-SEQ-FRM
• E-FRM-DC
• E-BAM Plus
• E-BAM
• SASS and SuperSASS
• For a complete list, contact
[e-mail]
3.6 Electrical Connections
Figure 3-4 shows the bottom view which includes connection points and features.
•Bluetooth antenna connector.
•RH sensor vent. This vent has a special membrane to allow moisture to enter and not
allow water or dust to enter the instrument.
Important: Do not poke the membrane, it can easily be damaged allowing water or
dust to enter the instrument.
•USB-C Port. For charging the internal battery, editing Engineering Units, and
downloading data.
•Temperature Probe Connector.
Figure 3-4 Swift 25.0 Bottom View
Temperature
Probe
Connector
USB C
Connector
Bluetooth
Antenna
Connector
RH Sensor
Vent

Swift 25.0-9800 Rev A Page 19
3.7 USB Driver Configuration
A Silicon Labs CP210x Driver for the USB connection must be installed before connecting to
the USB Type C port on the Swift 25.0. This is compatible with a Windows operating system
only. The USB driver can be downloaded from our website at
https://metone.com/software/. This only needs to be done once for each computer that is
used with the flow meter.
It is recommended that the unit be fully charged before operating the Swift 25.0 for the first
time. The battery is charged using the included USB cable. Insert the smaller USB C into the
Swift 25.0 on the left side of the unit. The USB “A” end of the cable can connect to any USB
port or connect to a standard outlet by using a USB wall adapter.
3.8 Configuration Software
The Swift 25.0 features Utility software to change the temperature and pressure units,
Download Snapshot data, and Tare or zero the flow sensor. The Swift Utility software can
be downloaded from our website at https://metone.com/software/.
Use the setup wizard to install the software on a computer. Connect the flow meter to the
computer with the USB cable. Open the Swift Utility software and select “GET” to load the
device information.
Once the flow meter information is displayed, the temperature and pressure Engineering
units can be changed using the drop-down menus. Temperature can be displayed in C
(Celsius) or F (Fahrenheit). Pressure can be displayed in mbar, mmHg, inHg, Pa, or kPa.
Press “Set” to change the displayed parameter.
3.8.1 Date and time
Important: Set the instrument to local Date, Time, and Engineering units prior to taking flow
measurements.
See Figure 8-12 Date and Time Settings For more information.

Page 20 Swift 25.0-9800 Rev A
4. OPERATION
The Swift 25.0 should be powered on before mating to a unit for measuring flow rate. The
Swift 25.0 performs a zero-flow measurement when first powered on. No air should be
passing through the flow meter before energizing the unit. The Swift 25.0 is ready to begin
sampling after a short boot up, approximately ten seconds. When the home screen is
displayed, the instrument is ready for use.
The Swift 25.0 will provide readings for the following:
•Battery status.
•Bluetooth connection status.
•Flow rate in liters per minute (LPM) or standard liters per minute (SLPM).
•Barometric Pressure in mbar, mmHg, kPa, inHg, or Pa.
•Temperature in °F or °C., Relative Humidity (RH) in %.
•Average Flow. (Averaged over 10 second intervals).
Readings are updated on the display once per second. Refer to section 3.3 User Interface
Display for more details about the displayed readings.
4.1 Installation
Install the Swift 25.0 by placing the outlet adaptor onto the flow inlet of the unit being
tested. As was mentioned in section 3.5 Outlet Fitting, the adaptor will fit an inlet with an
outer diameter of 1.25”. There are two O-rings inside the outlet adaptor to seal the flow
path. When pressing the flow meter on the inlet, two points of resistance will be felt from the
O-rings. When the second point of resistance is passed and can go no further, the meter is
fully seated.