Fluke VT650, VT900 User Manual

VT650/VT900

Gas Flow Analyzer

Users Manual



FBC - 0099
October 2017, Rev. 1

©2017 Fluke Corporation. All rights reserved. All product names are trademarks of their respective companies.

Warranty and Product Support

Fluke Biomedical warrants this instrument against defects in materials and workmanship for one year from the date of original purchase OR two
years if at the end of your first year you send the instrument to a Fluke Biomedical service center for calibration. You will be charged our
customary fee for such calibration. During the warranty period, we will repair or at our option replace, at no charge, a product that proves to be
defective, provided you return the product, shipping prepaid, to Fluke Biomedical. This warranty covers the original purchaser only and is not
transferable. The warranty does not apply if the product has been damaged by accident or misuse or has been serviced or modified by anyone
other than an authorized Fluke Biomedical service facility. NO OTHER WARRANTIES, SUCH AS FITNESS FOR A PARTICULAR PURPOSE,
ARE EXPRESSED OR IMPLIED. FLUKE SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL
DAMAGES OR LOSSES, INCLUDING LOSS OF DATA, ARISING FROM ANY CAUSE OR THEORY.

This warranty covers only serialized products and their accessory items that bear a distinct serial number tag. Recalibration of instruments is
not covered under the warranty.

This warranty gives you specific legal rights and you may also have other rights that vary in different jurisdictions. Since some jurisdictions do
not allow the exclusion or limitation of an implied warranty or of incidental or consequential damages, this limitation of liability may not apply to
you. If any provision of this warranty is held invalid or unenforceable by a court or other decision-maker of competent jurisdiction, such holding
will not affect the validity or enforceability of any other provision.

7/07

Notices

All Rights Reserved

 Copyright 2017, Fluke Biomedical. No part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval
system, or translated into any language without the written permission of Fluke Biomedical.

Copyright Release

Fluke Biomedical agrees to a limited copyright release that allows you to reproduce manuals and other printed materials for use in
service training programs and other technical publications. If you would like other reproductions or distributions, submit a written
request to Fluke Biomedical.

Unpacking and Inspection

Follow standard receiving practices upon receipt of the instrument. Check the shipping carton for damage. If damage is found, stop
unpacking the instrument. Notify the carrier and ask for an agent to be present while the instrument is unpacked. There are no special
unpacking instructions, but be careful not to damage the instrument when unpacking it. Inspect the instrument for physical damage
such as bent or broken parts, dents, or scratches.

Technical Support

For application support or answers to technical questions, either email [e-mail] or call 1-800- 850-4608 or
1-440-248-9300 (Europe [phone]).

Claims

Our routine method of shipment is via common carrier, FOB origin. Upon delivery, if physical damage is found, retain all packing
materials in their original condition and contact the carrier immediately to file a claim. If the instrument is delivered in good physical
condition but does not operate within specifications, or if there are any other problems not caused by shipping damage, please contact
Fluke Biomedical or your local sales representative.

Returns and Repairs

Return Procedure

All items being returned (including all warranty-claim shipments) must be sent freight-prepaid to our factory location. When you return
an instrument to Fluke Biomedical, we recommend using United Parcel Service, Federal Express, or Air Parcel Post. We also
recommend that you insure your shipment for its actual replacement cost. Fluke Biomedical will not be responsible for lost shipments or
instruments that are received in damaged condition due to improper packaging or handling.

Use the original carton and packaging material for shipment. If they are not available, we recommend the following guide for
repackaging:

• Use a double–walled carton of sufficient strength for the weight being shipped.

• Use heavy paper or cardboard to protect all instrument surfaces. Use nonabrasive material around all projecting parts.

• Use at least four inches of tightly packed, industry-approved, shock-absorbent material around the instrument.

Returns for partial refund/credit:
Every product returned for refund/credit must be accompanied by a Return Material Authorization (RMA) number, obtained from our

Order Entry Group at 1-440-498-2560.

Repair and calibration:

To find the nearest service center, go to www.flukebiomedical.com/service

or

To ensure the accuracy of the Product is maintained at a high level, Fluke Biomedical recommends the product be calibrated at least
once every 12 months. Calibration must be done by qualified personnel. Contact your local Fluke Biomedical representative for
calibration.

Certification

This instrument was thoroughly tested and inspected. It was found to meet Fluke Biomedical’s manufacturing specifications when it
was shipped from the factory. Calibration measurements are traceable to the National Institute of Standards and Technology (NIST).
Devices for which there are no NIST calibration standards are measured against in-house performance standards using accepted test
procedures.

WARNING

Unauthorized user modifications or application beyond the published specifications may result in electrical shock hazards or improper
operation. Fluke Biomedical will not be responsible for any injuries sustained due to unauthorized equipment modifications.

Restrictions and Liabilities

Information in this document is subject to change and does not represent a commitment by Fluke Biomedical. Changes made to the
information in this document will be incorporated in new editions of the publication. No responsibility is assumed by Fluke Biomedical
for the use or reliability of software or equipment that is not supplied by Fluke Biomedical, or by its affiliated dealers.

Manufacturing Location

The VT650/VT900 Gas Flow Analyzer is manufactured at Fluke Biomedical, 6920 Seaway Blvd., Everett, WA, U.S.A.

In the U.S.A. and Asia:
Cleveland Calibration Lab
Tel: [phone] x2564
Email: [e-mail]

In Europe, Middle East, and Africa:
Eindhoven Calibration Lab
Tel: [phone]
Email: [e-mail]

i

Table of Contents

Title Page

Introduction .................................................................................................... 1

Key Features .................................................................................................. 1

Safety Information .......................................................................................... 2

Unpacking and Inspection .............................................................................. 5

Accessories .................................................................................................... 6

The Analyzer .................................................................................................. 8

Power On the Analyzer ......................................................................... 10

Analyzer Connections ........................................................................... 12

Airway Flow (Inlet and Exhaust) .................................................... 12

Ultra-Low Flow + and - (VT900) .................................................... 13

High Pressure ............................................................................... 13

Low Pressure (+ and -) .................................................................. 14

Ultra-Low Pressure (VT900 only) .................................................. 14

Test Setup .................................................................................................... 15

Bi-directional Flow Mode ....................................................................... 15

VT650/VT900

Users Manual

ii

Unidirectional Flow Mode ......................................................................16

Inspiratory Flow Connections ........................................................ 16

Expiratory Test Connections ......................................................... 17

Operations .................................................................................................... 18

Measured Signals ................................................................................. 18

Airway Flow ................................................................................... 19

Airway Pressure ............................................................................ 19

Airway Temperature and Humidity ................................................19

High Pressure ................................................................................ 19

Low Pressure ................................................................................ 20

Ultra-Low Pressure (VT900) .......................................................... 20

Ultra-Low Flow (VT900) ................................................................ 20

Barometric Pressure ...................................................................... 20

Oxygen Concentration ................................................................... 21

Calculated Breath Parameters ...................................................... 21

Excel Add-in .......................................................................................... 21

Measurements ...................................................................................... 22

Make a Measurement .................................................................... 22

Save a Measurement .................................................................... 22

Main Menu Functions ............................................................................ 24

Profiles Menu ................................................................................ 24

Setup Menu ................................................................................... 25

Units .............................................................................................. 31

Special Tests Menu ....................................................................... 32

Calibrate Oxygen ........................................................................... 33

Customize Breath Views ............................................................... 34

Contents (continued)

iii

Memory Menu ............................................................................... 34

Test ID ........................................................................................... 34

Maintenance, Service and Calibration ......................................................... 35

Cleaning ................................................................................................ 35

Oxygen Sensor Replacement ............................................................... 36

Battery Status ....................................................................................... 36

Battery Replacement ............................................................................ 37

Replaceable Parts ................................................................................. 38

Service and Calibration ......................................................................... 38

Specifications ............................................................................................... 39

Pressure ................................................................................................ 40

Flow ...................................................................................................... 41

VT650/VT900

Users Manual

iv

1

Introduction

The VT650/VT900 Gas Flow Analyzer (the
Analyzer or Product), is a general purpose gas
flow analyzer with special features for testing
mechanical patient ventilators. The Analyzer
measures bi-directional air flow, high and
differential low pressure, barometric pressure,
Oxygen concentration and airway pressure,
airway temperature and airway humidity. The
VT900 also measures ultra-low flow (±750 ml/
min) and ultra-low pressure (0 mbar to 10 mbar).
The Analyzer can be controlled externally using
USB commands or automated with available
software. The Analyzer operates on a
rechargeable Li-Ion battery or external power
supply for stationary or portable use. All figures
show the VT900 unless otherwise noted.

Key Features

• Full range, bi-directional air flow and volume
channel

• Ultra-low flow and pressure ranges (VT900)

• High pressure, vacuum and differential low
pressure

• Airway pressure, Oxygen concentration,
temperature, and humidity

• Barometric pressure

• External trigger input (VT900)

• Rechargeable Li-ion battery with up to
8 hours battery life

•USB port

• Customizable profiles that can be saved

• Numerical and graphical screens with real
time data

• Automation software available

• On-board memory

VT650/VT900

Users Manual

2

Safety Information

A Warning identifies conditions and actions that
pose hazards to the user; a Caution identifies
conditions and actions that may damage the
Product or the equipment under test.

XW Warning

To prevent possible electrical shock, fire,
or personal injury:

• Read all safety information before
you use the Product.

• Use the Product only as specified, or
the protection supplied by the
Product can be compromised.

• Carefully read all instructions.

• Do not use the Product around
explosive gas, vapor, or in damp or
wet environments.

• Use this Product indoors only.

• Do not use the Product if it operates
incorrectly.

• Disable the Product if it is damaged.

• Do not use the Product if it is
damaged.

• The battery door must be closed and
locked before you operate the
Product.

• Recharge the battery when the low
battery indicator shows to prevent
incorrect measurements. Low
battery will also corrupt the memory
card.

• Remove all probes, test leads, and
accessories before the battery door
is opened.

• Remove all probes, test leads, and
accessories that are not necessary
for the measurement.

• Use only specified replacement
parts.

• Have an approved technician repair
the Product.

Gas Flow Analyzer

Safety Information

3

• Batteries contain hazardous
chemicals that can cause burns or
explode. If exposure to chemicals
occurs, clean with water and get
medical aid.

• Do not disassemble the battery.

• Repair the Product before use if the
battery leaks.

• Use only Fluke approved power
adapters to charge the battery.

• Do not short the battery terminals
together.

• Do not disassemble or crush battery
cells and battery packs.

• Do not keep cells or batteries in a
container where the terminals can
be shorted.

• Do not put battery cells and battery
packs near heat or fire. Do not put in
sunlight.

• Remove the battery if the Product is
not used for an extended period of
time, or if stored in temperatures
>50 °C. If the battery is not removed,
battery leakage can damage the
Product.

W Caution

To prevent possible damage, remove
the O2 sensor if the Product is stored
in temperatures >50 °C.

VT650/VT900

Users Manual

4

Symbols used on the Analyzer and in this manual are explained in Table 1.

Table 1. Symbols

Symbol Meaning Symbol Meaning

W

WARNING. RISK OF DANGER.

X

WARNING. HAZARDOUS VOLTAGE.
Risk of electric shock.



Consult user documentation.

P

Conforms to European Union directives.

+

Power button

)

Conforms to relevant North American
Safety Standards.



Li-ion Battery



Conforms to relevant Australian Safety
and EMC standards.

"

Power input 15 V dc 2.0 A



Conforms to relevant South Korean
EMC Standards.



Conforms to the Appliance Efficiency Regulation (California Code of Regulations, Title 20,
Sections 1601 through 1608), for small battery charging systems.

~

This product complies with the WEEE Directive marking requirements. The affixed label indicates
that you must not discard this electrical/electronic product in domestic household waste. Product
Category: With reference to the equipment types in the WEEE Directive Annex I, this product is
classed as category 9 "Monitoring and Control Instrumentation" product. Do not dispose of this
product as unsorted municipal waste.

Gas Flow Analyzer

Unpacking and Inspection

5

Unpacking and Inspection

Make sure you do not damage the Analyzer as
you unpack.

• Inspect the shipping carton for damage.

 If there is no damage, remove the

Analyzer from the shipping case. Save
the box and packing materials.

 If the shipping carton is damaged,

carefully continue to unpack the
Analyzer. Note any dents and scratches
on the Analyzer. Save the damaged
shipping carton and packing material for
the carrier’s inspection.

• Do a visual inspection. Make sure the
Analyzer is intact. If there is any physical
damage, such as bent or broken parts, dents,
or scratches, call a Fluke Biomedical Service
Center immediately. To return the Analyzer to
Fluke Biomedical for service see Returns and
Repairs.

• Check the standard accessories. If any
accessories are missing, contact a Fluke
Biomedical Service Center.

VT650/VT900

Users Manual

6

Accessories

Table 2 is a list of the standard accessories provided with the Analyzer.

Table 2. Standard Accessories

Item Part Number

USB Serial cable 4015274

AC power adapter 4760480

Accessory kit with: 4922115

Bacterial filter for external connection to the flow ports (1) 2133712

1.2 m (4 ft) silicon tubing (2) 2237172

22 mm ID x 22 mm ID tubing adapters (2) 2133305

22 mm OD x 22 mm OD tubing adapters (2) 2133291

Tapered 15 mm OD x 22 mm OD tubing adapters (2) 2133269

DISS Handtight Nut/Nipple to 6.4 mm (1/4 in) ID hose barb adapter (1) 2216329

Certificate of Calibration with test data --

Gas Flow Analyzer

Accessories

7

Table 3 is a list of optional accessories.

Table 3. Optional Accessories

Item Part Number

Soft-sided carrying case for ACCU-LUNG 2397628

ACCU LUNG II test lung 4281291

ACCU-LUNG Lung Simulator with Soft-sided carrying
case (2397628)

2387318

VESA system mount 4969657

VT650/VT900

Users Manual

8

The Analyzer

Figure 1 shows the top of the Analyzer.

Figure 1. Top of the Analyzer

 Touchsceen LCD
 Flow exhaust
 Flow inlet

D Low pressure + and -
E High pressure and vacuum
F Ultra-low pressure (VT900)
G Ultra-low flow + and - (VT900)
H Power button

FLOW
INLET

±

300 lpm

FLOW

EXHAUST

ULTRA

LOW FLOW

LOW

PRESSURE

ULTRA

LOW PRESSURE

0 TO 10 mbar

HIGH

PRESSURE

750 ml/min 160 mb ar0.8 TO 10 bar

GAS FLOW ANALYZER

VT900

4

5

7

6

8

3

2

1

Gas Flow Analyzer

The Analyzer

9

Figure 2 shows the back of the Analyzer.

Figure 2. Back of the Analyzer

 Handle clip
 USB port
 Oxygen sensor door

D External trigger input (VT900)
E Battery status indicator
F External DC power input

O2 SENSOR ACCESS DOOR

1

2

1

3456

VT650/VT900

Users Manual

10

Figure 3 shows the bottom of the Analyzer.

Figure 3. Bottom of the Analyzer

 VESA mount points (FDMI MIS-C, fits WxH

of 75 mm x 35 mm)

 Oxygen sensor door screw
 Bail

D Battery door screws
E Battery door

Power On the Analyzer

To power on the Analyzer, push +.

The Analyzer defaults to the Airway screen.
Figure 4 shows the main screen of the Analyzer.

2 3

4

5

1

Gas Flow Analyzer

The Analyzer

11

To make a selection, tap the screen.

Figure 4. Example of Airway Measurement

 Measurement and Other Menus
 Selected Profile
 Measurement settings

D Battery symbol
E Display area
F Screen options

2

3

4

5

6

1

VT650/VT900

Users Manual

12

Analyzer Connections

You can connect the Analyzer to a ventilator and
test lung in either a bi-directional or
unidirectional flow configuration.

Airway Flow (Inlet and Exhaust)

The outer diameter of the airway port is a
standard 22 mm fitting for use with patient
hoses. The inner diameter of the airway port
accepts a 15 mm male respiratory fitting for use
with endotracheal tubes, gas sampling adapters,
and similar equipment.

WCaution

To avoid damage to the Analyzer and
avoid adverse affects on the Analyzer
performance:

• Do not put metal objects into
connectors.

• Always use the external flow filter on
the main airflow channel inlet. This
helps reduce turbulence and keeps
out small particles that could
damage the flow sensor.

• To avoid damage to the sensor,
make sure the pressure inside the
airway port does not exceed 5 psi.

• Measure only dry gases with the
airway port. Do not use this port to
measure humidified gases.

Gas Flow Analyzer

The Analyzer

13

Ultra-Low Flow + and - (VT900)

The + and - ultra-low-flow ports have a barbed
hose fitting connection.

WCaution

To avoid damage to the Analyzer and
avoid adverse affects on the Analyzer
performance:

• To avoid damage to the sensor,
make sure the pressure inside the
ultra-low-flow port does not exceed
25 psi.

• Measure only dry gases with the
ultra-low-flow port. Do not use this
port to measure humidified gases.

High Pressure

The high-pressure port is primarily to test wall
and tank pressurized gas sources. The
connector works with standard oxygen DISS
fittings, as used on oxygen supply hoses.

WCaution

To avoid damage to the Analyzer and
avoid adverse affects on the Analyzer
performance:

• To avoid damage to the sensor,
make sure applied pressure does
not exceed 188 psi (13 bar).

• Measure only dry gases with the
high-pressure port. Do not use this
port to measure fluid pressure.

VT650/VT900

Users Manual

14

Low Pressure (+ and -)

Measure differential low pressure between the +
and - ports or gauge pressure on either port.
Connectors are barbed hose fittings.

WCaution

To avoid damage to the Analyzer and
avoid adverse affects on the Analyzer
performance:

• To avoid damage to the sensor,
make sure applied pressure does
not exceed 5 psi.

• Measure only dry gases with the
low-pressure port. Do not use this
port to measure fluid pressure.

Ultra-Low Pressure (VT900 only)

The ultra-low pressure port has a barbed hose
fitting connection.

WCaution

To avoid damage to the Analyzer and
avoid adverse affects on the Analyzer
performance:

• To avoid damage to the sensor,
make sure applied pressure does
not exceed 5 psi.

• Measure only dry gases with the
ultra-low-pressure port. Do not use
this port to measure fluid pressure.

Gas Flow Analyzer

Test Setup

15

Test Setup

Use the airway port for ventilator testing. Use a
test lung to set up a test that measures ventilator
parameters in bi-directional or uni-directional
modes. Fluke Biomedical recommends the bi­directional mode.

Bi-directional Flow Mode

For bi-directional flow connections, see Figure 5.

1. Use a Y-piece adapter to connect the
ventilator to the flow inlet on the Analyzer.

2. Use a standard breathing hose to connect to
the exhaust port on the Analyzer.

The Analyzer shows the flow of gas
delivered by the ventilator.

Figure 5. Bi-Direction Flow Mode Connections

FLOW

INLET

±

300 lpm

FLOW

EXHAUST

ULTRA

LOW FLOW

LOW

PRESSURE

ULTRA

LOW PRESSURE

0 TO 10 mbar

HIGH

PRESSURE

750 ml/min 160 mbar0.8 TO 10 bar

GAS FLOW ANALYZER

VT900

Inspiratory Hose

Expiratory Hose

Ventilator

Test Lung

Inlet

Exhaust

VT650/VT900

Users Manual

16

Unidirectional Flow Mode

Use the unidirectional flow to measure either
inspiratory or expiratory gas flow.

Inspiratory Flow Connections

For inspiratory connections, see Figure 6.

1. Connect the inspiratory hose to the flow inlet
on the Analyzer.

2. Use a standard breathing hose to connect
the test lung to the exhaust port on the
Analyzer.

Figure 6. Inspiratory Breathing Circuit Connections

FLOW

INLET

±

300 lpm

FLOW

EXHAUST

ULTRA

LOW FLOW

LOW

PRESSURE

ULTRA

LOW PRESSURE

0 TO 10 mbar

HIGH

PRESSURE

750 ml/min 160 mbar0.8 TO 10 bar

GAS FLOW ANALYZER

VT900

Inspiratory Hose

Ventilator

Inlet

Exhaust

Expiratory Hose

Test Lung

Gas Flow Analyzer

Test Setup

17

Expiratory Test Connections

For expiratory connections, see Figure 7.

1. Connect the expiratory hose from the test
lung to the flow inlet on the Analyzer.

2. Use a standard breathing hose to connect
the ventilator to the exhaust port on the
Analyzer.

The Analyzer shows the flow of gas
delivered by the ventilator.

Figure 7. Expiratory Breathing Circuit Connections

FLOW

INLET

±

300 lpm

FLOW

EXHAUST

ULTRA

LOW FLOW

LOW

PRESSURE

ULTRA

LOW PRESSURE

0 TO 10 mbar

HIGH

PRESSURE

750 ml/min 160 mbar0.8 TO 10 bar

GAS FLOW ANALYZER

VT900

Inspiratory Hose

Ventilator

Inlet

Exhaust

Expiratory Hose

Test Lung

VT650/VT900

Users Manual

18

Operations

Use the Analyzer to measure flow and pressure.
For each test: select the test and do the setup.

Displayed options depend on the selected test:

•Zero—Corrects sensor offsets for the
selected measurements.

• Graph—Select the parameters to graph.

• Back—Return to the previous screen.

• Clear—Clear the graph and statistics

(minimum, maximum, and average).

• Autoscale—Toggles between Autoscale and
manual scale.

• Profiles—Select a different profile.

• Save—Saves the final result.

Measured Signals

The Analyzer measures these signals:

• Airway flow

• Airway pressure

• Airway temperature and humidity

• High pressure

•Low pressure

• Ultra-low pressure (VT900)

• Ultra-low flow (VT900)

• Barometric pressure

• Oxygen concentration

• Calculated breath parameters

Gas Flow Analyzer

Operations

19

Airway Flow

The Analyzer has a full-range flow (±300 lpm),
with bi-directional flow measurement. Flow
measurements are either static flows—no
breath variations, or ventilator waveforms—both
an expiratory phase and an inspiratory phase.
The Analyzer uses a heat transfer sensor to
measure the flow.

Use this measurement for pediatric or adult
ventilators or to determine the performance of
many types of flow meters.

Airway Pressure

The Analyzer measures airway pressure from a
proximal tap of the channel (near the exhaust
port).

Airway Temperature and Humidity

There is a temperature / humidity sensor in the
airway channel on the exhaust side of the flow
sensor. The Analyzer uses the temperature
reading to automatically adjust for the gas
corrections (see Table 6).

Tap More Data on the Airway screen to see
temperature and humidity.

High Pressure

The high-pressure port measures gauge
pressure in the range of -0.8 bar to 10 bar. The
Analyzer can use this pressure measurement for
any gauge pressure in the given range.

VT650/VT900

Users Manual

20

Low Pressure

The low-pressure port is a dual-port connection
consisting of a (+) positive and a (-) negative
pressure port.

The differential pressure range is ±160 mbar.
Use this pressure measurement for any
pressure differential or gauge pressure in the
given range.

Ultra-Low Pressure (VT900)

The ultra-low pressure sensor measures gauge
pressure in the range of 0 mbar to 10 mbar. Use
this pressure range for accurate, very low
pressure measurements.

Ultra-Low Flow (VT900)

The Analyzer (VT900 only) has ultra-low flow
(±750 ml/min) bi-directional flow measurement
capability. The flow measurement is for
accurate, high resolution, static low flow
measurements, not for ventilator waveforms.
The flow sensor uses the heat transfer method
to measure air flow. Use the ultra-low flow to
measure many types of low flow meters.

Barometric Pressure

The Analyzer makes barometric pressure
measurements. The barometer reads absolute
pressures from 8 psia to 18 psia. The Analyzer
also uses the barometer in the automatic gas
corrections for airway flow measurements.

Gas Flow Analyzer

Operations

21

Oxygen Concentration

The Analyzer measures oxygen concentration
through the airflow channel. An integrated
sensor measures the oxygen percent of the gas
in the airflow channel of the Analyzer. The range
for this sensor is 0 % to 100 %. The oxygen cell
is mounted inside the enclosure on the rear
bulkhead for the high-flow circuit. The oxygen
cell must be replaced approximately once a year
(VT650) or every 2 years (VT900).

Calculated Breath Parameters

From the primary flow and pressure
measurements, the Analyzer calculates breath
parameters. A breath detection algorithm
determines the various phases of a ventilator
breath and calculates the parameters listed in
Table 10.

Excel Add-in

Install custom Excel add-in, available for
download at www.flukebiomedical.com.

Use the

Excel Add-in on a PC to view results data. The
Excel Add-in has these worksheets:

• Data – shows saved data

• Recording – shows recorded data

• Graph – shows graphs and data

VT650/VT900

Users Manual

22

Measurements

Figure 8 is an example of the measurement
screen.

Make a Measurement

To make a measurement:

1. Select the type of measurement.

2. To set the offset to zero, tap Zero. Make
sure to remove all the connections.

Note

You may need to block the airflow channel
if room air currents are present.

3. To switch between Auto and manual scaling,
tap Autoscale.

Save a Measurement

The Analyzer can save readings or start a
recording to save.

To save a measurement:

1. On the measurement screen, tap Save.

2. Select the type of reading you want to save.

 Data—The current data points.

 Graph—The current data points in a

graphical format.

 Record—Set up the parameters and

start a new recording to save.

Gas Flow Analyzer

Operations

23

Figure 8. Example of Measurement

 Measurements
 Change scaling
 Graph area

D Toggle manual or automatic scaling

1

2

2

3

4

VT650/VT900

Users Manual

24

Main Menu Functions

Use the Main menu to access the Analyzer
functions, including:

•Profiles

•Setup

•Units

• Special Tests

•Memory

• Customize Breath Views

• Calibrate Oxygen

• Test ID

Profiles Menu

You can configure the settings on the Analyzer
to create test profiles. The analyzer can save up
to 20 profiles.

The Analyzer stores the profiles using a numeric
code and a profile name. 00 is the default
numeric code. You cannot change the 00 default
profile. An asterisk (*) indicates the profile that
will be loaded at start up.

To select a profile, use the arrow keys.

To manage profiles, select Menus > Profile or
tap Profile on the Airway screen.

Options are:

•View Current —View the settings for the
current profile loaded on the Analyzer. Tap

More for another page of settings.

• View Selection—View the settings of the

highlighted profile in the profile list. Tap More
for another page of settings.

Gas Flow Analyzer

Operations

25

• *Use on Power-Up—Make the selected
profile the default profile.

• Back—Go to the main Profile menu.

•Edit Name—Change the name of the
selected profile.

• Load—Select a profile to load. If there are no
saved profiles, the option is Default.

• Save—Saves the current profile.

Setup Menu

Use the Setup menu to make and view the
Analyzer settings.

To setup the Analyzer, select Menus > Setup.

For Setup selections, see Table 4.

Table 4. Setup Menu

Setup Description

Gas Select the type of gas. See Table 5.

Correction Mode

Select the type of Gas correction (temperature and pressure) to different
gas standards. See Table 6.

VT650/VT900

Users Manual

26

Breath Detect

Sets the options for Breath Detection. Options are:

• Mode - Sets the breath detection mode:

 Bidirectional
 Uni-directional Inspiratory
 Uni-directional Expiratory
 Off - disables breath triggering

• Trigger Source - Sets how the breath detection is triggered:

 Flow - Set the Threshold
 Pressure - Requires back pressure, such as a test lung
 External - enables external TTL triggering input on the Analyzer

(VT900)

• Patient - Sets the type of patient:

 Adult
 Pediatric

• Threshold - Enter the numeric value for the detection limit.

 + (Inspiratory threshold)
 - (Expiratory threshold)

Table 4. Setup Menu (cont.)

Setup Description

Gas Flow Analyzer

Operations

27

Instrument
Information

Displays basic information about
the Analyzer including:

• Model number

• Serial number

• Firmware version

• Date of calibration

• Battery charge level

• Memory remaining

Auto Dim

Options are:

• On - The LCD dims after 5 minutes of no use. Tap to restore brightness.

• Off - The LCD does not auto dim.

Beeper

Options are:

•Off

•Soft

•Medium

• Loud

Table 4. Setup Menu (cont.)

Setup Description

VT650/VT900

Users Manual

28

Time and Date

Options are:

• Set Time Format - Select 12 hour with am/pm or 24 hour.

• Set Time - Tap the arrows to set the time. If in 12-hour format, select am
or pm.

• Set Date Format - Select MM/DD/YYYY, DD/MM/YYYY, or 
YYYY/MM/DD.

• Set Date - Tap the arrows to set the date.

Brightness

Options are:

•Low

• Medium

•High

Language Select the language.

Table 4. Setup Menu (cont.)

Setup Description

Gas Flow Analyzer

Operations

29

Table 5. Gas Types

Gas Type Description

Air Standard room air

N2 100 % Nitrogen

N2O 100 % Nitrous Oxide

CO2 100 % Carbon Dioxide

O2 100 % Oxygen

Ar 100 % Argon

Heliox 21 % Oxygen, and 79 % Helium

O2 bal N2O mix

[1]

Measured Oxygen, balance Nitrous Oxide

O2 bal He mix

[1]

Measured Oxygen, balance Helium

O2 bal N2 mix

[1]

Measured Oxygen, balance Nitrogen

[1]

For these gases, the oxygen concentration is measured using the oxygen sensor in the airflow channel. The balance is the other gas. These

gases can only be measured in the airflow channel, not available in the ultra-low-flow channel of the VT900.

VT650/VT900

Users Manual

30

Table 6. Gas Correction Mode

Gas Correction Description

ATP Ambient temperature and pressure (actual humidity)

ATPD Ambient temperature and pressure, dry (0 % humidity)

ATPS Ambient temperature and pressure, saturated (100 % humidity)

STP20 Standard temperature 20 °C, standard pressure 760 mmHg (actual humidity)

STP21 Standard temperature 21 °C, standard pressure 760 mmHg (actual humidity)

STPD0 Standard temperature 0 °C, standard pressure 760 mmHg, dry (0 % humidity)

STPD20 Standard temperature 20 °C, standard pressure 760 mmHg, dry (0 % humidity)

STPD21 Standard temperature 21 °C, standard pressure 760 mmHg, dry (0 % humidity)

BTPS Body temperature 37 °C, ambient pressure 760 mmHg, saturated (100 % humidity)

BTPD Body temperature 37 °C, ambient pressure 760 mmHg, dry (0 % humidity)

Note: Gas correction applies to the airflow channel. The ultra-low-flow channel of the VT900 is set to STPD21.

Gas Flow Analyzer

Operations

31

Units

You can change the units of measure for all
readings.

To set the units:

1. Select Menus > Units.

2. Select the type of reading.

3. Select the unit of measure. See Table 7.

4. Select OK.

Table 7. Available Units of Measure

Unit Description

Flow

lpm Liters per minute

lps Liters per second

mlpm Milliliters per minute

mlps Milliliters per second

cfm Cubic feet per minute

Volume

lLiters

ml Milliliters

cf Cubic feet

Temperature

°C Celsius

°F Fahrenheit

Table 7. Available Units of Measure (cont.)

Unit Description

VT650/VT900

Users Manual

32

Special Tests Menu

Use the Special Tests menu for more tests.

Leak Tests calculate the lost volume over the
specified time. To do a leak test:

1. Select Menus > Special Tests.

2. Select the type of leak test:

 Airway Pressure

 High Pressure

 Low Pressure

 Ultra-Low Pressure

3. Use the keypad to enter the length of the
test.

4. Tap Compliance and use the keypad to
enter the compliance limit.

Use compliance to calculate volume lost. For
example, enter the ml of volume lost per
cmH

2

O. If blank, volume lost is not

calculated.

5. Tap Start.

Pressure

mbar millibar = 0.001 bar

bar 14.7 psi

mmHg Millimeters of mercury

inHg Inches of mercury

cmH

2

0

Centimeters of water

inH

2

0

Inches of water

psi Pounds per square inch

atm Atmosphere

kPa Kilopascals

Table 7. Available Units of Measure (cont.)

Unit Description

Gas Flow Analyzer

Operations

33

Trend Tests show how a particular breath
parameter performs over time. To do a trend
test:

1. Select Menus > Special Tests > Trend
Test.

2. Use the arrows to select the parameter to
measure.

3. Use the keypad to enter the % limit for
maximum allowed deviation.

4. Tap Start.

The Stacked Volume Test measures the volume
of multiple breaths. Breath volume determines
the accuracy of the ventilator in accumulating
volume.

1. Select Menus > Special Tests > Stacked
Volume Test.

2. Use the key pad to enter the number of
breaths.

3. Select Start.

The test stops when the number of breaths
is reached or you select End.

The High Frequency Test measures high­frequency flow and airway pressure.

1. Select Menus > Special Tests > High

Frequency Test

2. Apply the high-frequency flow or pressure.

Calibrate Oxygen

Calibrate the oxygen sensor at the beginning of
each day that oxygen will be measured, and
after replacing the sensor.

To calibrate the sensor:

1. Select Menus > Calibrate Oxygen.

2. Follow the on-screen instructions. Make sure
to complete both steps.

If the calibration fails, replace the Oxygen
sensor. If the problem persists, contact Fluke
Biomedical for repair.

VT650/VT900

Users Manual

34

Customize Breath Views

Use Customize Breath Views to configure
custom breath screens with up to eight readings
each. Select the Airway or the Breath
parameters to show.

Memory Menu

Use Memory to manage stored readings.

1. Select Menus > Memory.

2. Select List.

Options are:

• Back—Go back to the previous screen.

• View—Views the selected reading.

• Delete—Deletes the selected reading.

• Delete All—Deletes all readings.

Test ID

Use the Test ID to identify saved test data. Use
the keyboard to enter a Test ID. When viewing
Memory, select a Test ID to see the saved data.

Gas Flow Analyzer

Maintenance, Service and Calibration

35

Maintenance, Service and
Calibration

The Analyzer requires little maintenance or
special care; however it is a calibrated
measuring instrument and should be treated
with care.

W Caution

To prevent damage to the Analyzer or
adverse affects on the Analyzer
performance, do not drop the Analyzer
and avoid mechanical abuse that could
cause a shift in the calibrated settings.

Fluke Biomedical recommends storing the
Analyzer in the carry case. Do not store the
Analyzer where there is vibration.

During use, always use the external flow filter on
the main airflow channel inlet. The filter helps
reduce turbulence and keeps out small particles
that could damage the flow sensor.

Cleaning

Clean the exterior of the Analyzer occasionally
with a cloth dampened with a mild detergent
solution. To remove stains and clean the
Analyzer, use a solution of 70 % isopropyl
alcohol. Fluke Biomedical does not recommend
any other solvents.

W Caution

To prevent damage to the Analyzer or
adverse affects on the Analyzer
performance, do not spray liquid directly
on the Analyzer. Do not immerse the
Analyzer.

VT650/VT900

Users Manual

36

Oxygen Sensor Replacement

The Analyzer uses a galvanic oxygen sensor
that is under warranty for 12 months. You must
replace the oxygen sensor cell when the oxygen
calibration cannot be successfully completed.
The oxygen sensor can operate for longer than
12 months depending on use. With normal use
the VT650 oxygen sensor will last 12 months
and the VT900 oxygen sensor will last
24 months.

To replace the oxygen sensor:

1. Remove the screws in the oxygen sensor
door on the back of the Analyzer.

The oxygen sensor is a round plastic
cylinder about one inch in diameter with
wires protruding from the back of the sensor.

2. Disconnect the electrical connector on the
sensor wire.

3. Unscrew the old sensor and remove it.

4. Screw in the new sensor. (See Replaceable
Parts).

5. Re-connect the sensor wire.

6. Replace the oxygen sensor door.

7. Re-calibrate the oxygen sensor. (See

Calibrate Oxygen.)

Battery Status

The Battery status indicator on the back of the
Analyzer has these normal states:

• Solid red—Battery is charging

• Solid green—Battery is 100 % charged

The battery has these error states:

• Blinking red—Battery charger error

• Blinking red/green—Battery charger error
(Battery is near full charge.)

For these errors, remove the ac adapter and
reinstall. If the problem reoccurs, replace the
battery pack. If the problem persists, contact
Technical Support.

Gas Flow Analyzer

Maintenance, Service and Calibration

37

Battery Replacement

To check the battery charge level, remove the
battery door and push the TEST button on the
battery. The battery displays the percentage of
charge.

Use only the replacement battery listed in
Table 8.

To replace the battery (See Figure 9):

1. Loosen the screws on the battery door. (The
screws do not come out.)

2. Remove the battery door.

3. Use the strap on the battery to lift out the
battery.

4. Insert the new battery and replace the
battery door.

Figure 9. Battery Replacement

1

2

3

VT650/VT900

Users Manual

38

Replaceable Parts

Table 8 is a list of the replaceable parts for the
Analyzer.

Service and Calibration

To maintain accuracy, calibrate the Analyzer
annually. If the Analyzer does not operate
successfully or if it needs calibration, return it to
the Fluke Biomedical Service Center, as
indicated under Warranty and Product Support.
As part of this service, hardware and software
updates are automatically installed.

W Caution

To prevent damage to the Analyzer or
adverse affects on the Analyzer
performance:

• Other than replacement of minor
components, such as the oxygen
sensor, all Analyzer service should be
done by qualified service personnel.

Table 8. Replaceable Parts

Item Fluke Part Number

Oxygen sensor (VT650) 2138514

Oxygen sensor (VT900) 4917220

O2 sensor door 4916215

Battery Door 4916194

Battery Pack 4948749

Protective cap (High­pressure)

2133735

Protective caps (Flow) 2133758

Protective caps (Pressure) 4918975

Gas Flow Analyzer

Specifications

39

• To keep foreign debris from entering
the Analyzer, use flow and pressure
protective caps when transporting
the Analyzer.

• To keep the Analyzer under
warranty, make sure the Analyzer is
calibrated by qualified service
personnel only.

Specifications

Specifications are based on a one year calibration cycle and apply
to ambient temperature 18 °C to 28 °C unless stated otherwise.

Display ....................................7 in, 800 x 480 touchscreen LCD

Communications .....................USB, Micro-B Device Port

Environmental Conditions

Operating Temperature ......10 °C to 40 °C

Storage Temperature..........-20 °C to +60 °C

Note

For storage temperatures below -15 °C or above
+50 °C, remove the oxygen sensor.

Operating Humidity .............10 % to 90 % non-condensing

Storage Humidity ................5 % to 95 % non-condensing

Altitude................................3000 m

Power

AC adapter

Input Voltage Range ....... 100 V ac to 240 V ac

Input Frequency

Range .............................50 Hz/60 Hz

DC Output.......................15 V, 2 A

Polarity............................Center positive (+)

VT650/VT900

Users Manual

40

Battery

Rechargeable Li-Ion

Battery ........................... 10.8 V, 2.5 Ah, 27 Wh, 3ICR19/66

Discharge temperature... 0 °C to 50 °C

Charge temperature ....... 0 °C to 40 °C

Battery life ...................... 8 hours

Battery charge time ........ 5 hours, typical

Note

Battery life is dependent on backlight brightness, auto­dim, and other battery intensive settings.

Pressure

Ultra Low Pressure (VT900)

Maximum applied 

pressure ............................. 400 mbar

Operating Pressure ............ 0 mbar to 10 mbar

Span Accuracy .................. ±1 % of rdg or ±0.01 mbar

(whichever is greater)

Resolution .......................... 0.001 mbar

Low Pressure

Maximum applied 

pressure ............................. 400 mbar

Operating Pressure............ (Differential) ±160 mbar

Span Accuracy................... ±0.5 % of rdg or ±0.1 mbar

(whichever is greater)

Resolution .......................... 0.01 mbar

High Pressure

Maximum applied 

pressure ............................. 13 bar

Operating Pressure............ -0.8 bar to 10 bar

Span Accuracy................... ±1 % of rdg or ±7 mbar (whichever

is greater)

Resolution .......................... 1 mbar

Airway Pressure

Maximum applied 

pressure ............................. 400 mbar

Operating Pressure............ ±160 mbar

Span Accuracy................... ±0.5 % of rdg or ±0.1 mbar

(whichever is greater)

Frequency Response......... 10 % to 90 % rise time <10 ms

Resolution .......................... 0.01 mbar

Sample rate

 200 Hz

Pressure Temperature

Coefficient .............................. Add 0.01 % of range per °C

between 10 °C and 18 °C
Add 0.01 % of range per °C
between 28 °C and 40 °C

Gas Flow Analyzer

Specifications

41

Flow

Airway Flow

Resolution...........................0.01<100 slpm and 

0.1 >100 slpm

Accuracy .............................see Table 9

Frequency Response..........10 % to 90 % rise time <10 ms

Sample Rate

 200 Hz

Dynamic Resistance ..........<2.00 cmH2O @ 60 slpm

Ultra-Low-Flow (VT900)

Range .................................±750 ml/min

Accuracy .............................±1.7 % of rdg or 0.01 slpm

Resolution...........................0.001 lpm

Flow Temperature

Coefficient ...............................Add 0.2 % of reading per °C

between 10 °C and 18 °C
Add 0.2 % of reading per °C
between 28 °C and 40 °C

Table 9. Airway Flow Range and Accuracy

Gas Range Specification

Main Airway Flow

Air, Nitrogen (N2),
Oxygen (O2)

±300 slpm

1.7 % of rdg or

0.04 slpm

Argon, Heliox,
O2 bal He, O2 bal N2

±300 slpm

3.0 % of rdg or

0.08 slpm, typical

Carbon Dioxide (CO2),
Nitrous Oxide (N2O),
O2 bal N20,

±150 slpm

3.0 % of rdg or

0.08 slpm, typical

Ultra-low Flow (VT900)

Air, Nitrogen (N2),
Oxygen (O2)

±0.750 slpm

1.7 % of rdg or

0.01 slpm

Argon ±0.750 slpm

3.0 % of rdg or

0.02 slpm, typical

Nitrous Oxide (N2O) ±0.400 slpm

3.0 % of rdg or

0.02 slpm, typical

Note: Ultra-low flow that is over range can be detected
as unstable. If this occurs, reduce flow.

Table 9. Airway Flow Range and Accuracy (cont.)

Gas Range Specification

VT650/VT900

Users Manual

42

Volume (Airway Flow channel)

Range................................. 100 l

Accuracy ............................ ±1.75 % rdg or 0.02 l

(whichever is greater)

Resolution .......................... 0.001<1 and 0.01>1 l

Temperature and Humidity (Airway Flow channel)

Temperature range ............ 0 °C to 50 °C

Temperature accuracy*...... ±0.5 °C

Temperature resolution ...... 0.1 °C

Humidity range ................... 0 % to 100 % RH

Humidity accuracy* ............ 3 % RH from 20 % to 80 % RH

5 % RH < 20 %, and >80 % RH

Humidity resolution............. 0.1 % RH

* with steady state air flow

Oxygen concentration (Airway Flow channel)

Range................................. 0 % to 100 %

Accuracy ............................ ±1 % (VT900), ±2 % (VT650)

Resolution .......................... 0.1 %

Gas correction

See Table 6.

Gas types

Air, Nitrogen (N

2

), Nitrous Oxide (N2O), Carbon Dioxide (CO2),

Oxygen (O

2

), Argon, Heliox (21 % O2, 79 %He), Oxygen/

Nitrogen, Oxygen/Nitrous Oxide, Oxygen/Helium

Units of measure

Flow ................................... lpm (liter/minute), cfm (ft

3

/minute),

lps (liter/sec), ml/min, ml/sec

Pressure............................. psi, kPa, bar, mbar, atm, inH2O (at

4 °C, inHg (at 0 °C), cmH2O (at
4 °C), mmHg (at 0 °C)

Volume............................... l (liter), cf (ft

3

), ml

Temperature ...................... C, F

Humidity ............................. % RH

Safety

General .............................. IEC 61010-1: Pollution Degree 2

Lithium Battery ................... IEC 62133

Gas Flow Analyzer

Specifications

43

Electromagnetic Compatibility (EMC)

International ........................IEC 61326-1: Controlled

Electromagnetic Environment

CISPR 11: Group 1, Class A

Group 1: Equipment has intentionally generated and/or
uses conductively-coupled radio frequency energy that is
necessary for the internal function of the equipment itself.

Class A: Equipment is suitable for use in all establishments
other than domestic and those directly connected to a low­voltage power supply network that supplies buildings used
for domestic purposes. There may be potential difficulties
in ensuring electromagnetic compatibility in other

environments due to conducted and radiated disturbances.

Caution: This equipment is not intended for use in
residential environments and may not provide adequate
protection to radio reception in such environments.

Emissions that exceed the levels required by CISPR 11
can occur when the equipment is connected to a test
object.

Korea (KCC) ...................Class A Equipment (Industrial

Broadcasting & Communication
Equipment)

Class A: Equipment meets requirements for industrial
electromagnetic wave equipment and the seller or user
should take notice of it. This equipment is intended for use
in business environments and not to be used in homes.

USA (FCC)......................47 CFR 15 subpart B. This product

is considered an exempt device per
clause 15.103.

VT650/VT900

Users Manual

44

Table 10. Breath Parameter Accuracy

Parameter Abbreviation Resolution Range Accuracy

Inspiratory Tidal Volume Vti 0.1 ml 0 l to 60 l ±1.75 % of rdg or 0.02 l

Expiratory Tidal Volume Vte 0.1 ml 0 l to 60 l ±1.75 % of rdg or 0.02 l

Minute Volume
(The Expiratory Tidal Volume times the

respiratory rate in breaths per minute.
Reported as an eight-breath average.)

MV 0.001 lpm 0 l to 100 l ±1.75 % of rdg or 0.02 l

Breath Rate BPM 0.1 bpm 1 bpm to 1500 bpm 1 %

Inspiratory to Expiatory Time Ratio (I:E
Ratio)

(The ratio of the Inspiratory Time to the
Expiratory Time)

I:E 0.01 1:300 to 300:1 ±2 % or 0.1

Peak Inspiratory Pressure
(The maximum pressure during the

Inspiratory Time.)

PIP 0.1 mbar ±160 mbar ±0.75 % of rdg or 0.1 mbar

Inspiratory Pause Pressure IPP 0.1 mbar ±160 mbar ±0.75 % of rdg or 0.1 mbar

Mean Airway Pressure
(The mean pressure over the entire

breath.)

MAP 0.1 mbar ±160 mbar ±0.75 % of rdg or 0.1 mbar

Positive End-Expiratory Pressure
(The average pressure during the End
Expiratory State.)

PEEP 0.1 mbar ±160 mbar ±0.75 % of rdg or 0.1 mbar

Lung Compliance

[1]

CMPL 0.1 ml/mbar 0 ml/mbar to 1000 ml/mbar ±3 % or 0.1 ml/mbar

Gas Flow Analyzer

Specifications

45

Inspiratory Time
(The time of the inspiratory period
including the inspiratory hold time.)

Ti 0.01 sec 0 sec to 60 sec 0.02 sec

Inspiratory Hold Time
(The time of the End Inspiratory State.)

TiH 0.01 sec 0 sec to 60 sec 1 % or 0.1 sec

Expiratory Time
(The time of the expiratory period
including the expiratory hold time.)

Te 0.01 sec 0 sec to 90 sec 0.5 % or 0.01 sec

Expiratory Hold Time
(The time of the End Expiratory State.)

TeH 0.01 sec 0 sec to 90 sec 0.02 sec

Peak Inspiratory Flow
(The maximum of the absolute value of

the Flow Rate measured during the
Inspiratory Time.)

PIF 0.01 lpm ±300 lpm ±1.7 % or 0.04 lpm

Peak Expiratory Flow
(The maximum of the absolute value of
the Flow Rate
measured during the Expiratory Time.)

PEF 0.01 lpm ±300 lpm ±1.7 % or 0.04 lpm

[1] Inspiratory pause time >0.5 sec

Table 10. Breath Parameter Accuracy (cont.)

Parameter Abbreviation Resolution Range Accuracy

VT650/VT900

Users Manual

46