TSI Instruments Certifier 4090 User manual

www.tsi.com
CertifierPro Flow
Analyzer Test System
Model 4090
User Manual
P/N 6016808, Revision A
April 2023

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iii
Warranty
Copyright
TSI Incorporated / 2023 / All rights reserved.
Address
TSI Incorporated / 500 Cardigan Road / Shoreview, MN 55126 USA
WARNING
TSI®flow meters employ a heated platinum sensor. They SHOULD NOT be used with
flammable or explosive gases or mixtures.
TSI®Flow Analyzers are not designed for use with anesthesia gas other than
nitrous oxide. Only an anesthesia gas measurement accessory is designed for use with
these gases.
C A U T I O N
TSI®Certifier Flow Analyzers are not medical devices under FDA 510k and in no
situation should they be utilized for human respiration measurements.
A T T E N T I O N
As indicated by the WEEE Symbol on the case of the instrument, this product should
not be discarded as unsorted waste but must be sent to separate collection facilities for
recovery and recycling.
Limitation of Warranty and Liability (effective February 2015)
(For country-specific terms and conditions outside of the USA, please visit www.tsi.com.)
Seller warrants the goods, excluding software, sold hereunder, under normal use and service as described in the operator's
manual, to be free from defects in workmanship and material for 2 years (24 months), or if less, the length of time specified in
the operator's manual, from the date of shipment to the customer. This warranty period is inclusive of any statutory warranty.
This limited warranty is subject to the following exclusions and exceptions:
a. Hot-wire or hot-film sensors used with research anemometers, and certain other components when indicated in specifications,
are warranted for 90 days from the date of shipment;
b. 
c. Parts repaired or replaced as a result of repair services are warranted to be free from defects in workmanship and material,
under normal use, for 90 days from the date of shipment;
d. Seller does not provide any warranty on finished goods manufactured by others or on any fuses, batteries or other consumable
materials. Only the original manufacturer's warranty applies;
e. This warranty does not cover calibration requirements, and seller warrants only that the instrument or product is properly
calibrated at the time of its manufacture. Instruments returned for calibration are not covered by this warranty;
f. This warranty is VOID if the instrument is opened by anyone other than a factory authorized service center with the one
exception where requirements set forth in the manual allow an operator to replace consumables or perform recommended
cleaning;
g. This warranty is VOID if the product has been misused, neglected, subjected to accidental or intentional damage, or is not
properly installed, maintained, or cleaned according to the requirements of the manual. Unless specifically authorized in a
separate writing by Seller, Seller makes no warranty with respect to, and shall have no liability in connection with, goods which
are incorporated into other products or equipment, or which are modified by any person other than Seller.
The foregoing is IN LIEU OF all other warranties and is subject to the LIMITATIONS stated herein. NO OTHER EXPRESS OR
IMPLIED WARRANTY OF FITNESS FOR PARTICULAR PURPOSE OR MERCHANTABILITY IS MADE. WITH RESPECT TO
SELLER’S BREACH OF THE IMPLIED WARRANTY AGAINST INFRINGEMENT, SAID WARRANTY IS LIMITED TO CLAIMS
OF DIRECT INFRINGEMENT AND EXCLUDES CLAIMS OF CONTRIBUTORY OR INDUCED INFRINGEMENTS. BUYER’S
EXCLUSIVE REMEDY SHALL BE THE RETURN OF THE PURCHASE PRICE DISCOUNTED FOR REASONABLE WEAR AND
TEAR OR AT SELLER’S OPTION REPLACEMENT OF THE GOODS WITH NON-INFRINGING GOODS.

iv 
TO THE EXTENT PERMITTED BY LAW, THE EXCLUSIVE REMEDY OF THE USER OR BUYER, AND THE LIMIT OF
SELLER'S LIABILITY FOR ANY AND ALL LOSSES, INJURIES, OR DAMAGES CONCERNING THE GOODS (INCLUDING
CLAIMS BASED ON CONTRACT, NEGLIGENCE, TORT, STRICT LIABILITY OR OTHERWISE) SHALL BE THE RETURN OF
GOODS TO SELLER AND THE REFUND OF THE PURCHASE PRICE, OR, AT THE OPTION OF SELLER, THE REPAIR OR
REPLACEMENT OF THE GOODS. IN THE CASE OF SOFTWARE, SELLER WILL REPAIR OR REPLACE DEFECTIVE
SOFTWARE OR IF UNABLE TO DO SO, WILL REFUND THE PURCHASE PRICE OF THE SOFTWARE. IN NO EVENT
SHALL SELLER BE LIABLE FOR LOST PROFITS, BUSINESS INTERRUPTION, OR ANY SPECIAL, INDIRECT,
CONSEQUENTIAL OR INCIDENTAL DAMAGES. SELLER SHALL NOT BE RESPONSIBLE FOR INSTALLATION,
DISMANTLING OR REINSTALLATION COSTS OR CHARGES. No Action, regardless of form, may be brought against Seller
more than 12 months after a cause of action has accrued. The goods returned under warranty to Seller's factory shall be at
Buyer's risk of loss, and will be returned, if at all, at Seller's risk of loss.
Buyer and all users are deemed to have accepted this LIMITATION OF WARRANTY AND LIABILITY, which contains the complete
and exclusive limited warranty of Seller. This LIMITATION OF WARRANTY AND LIABILITY may not be amended, modified or its
terms waived, except by writing signed by an Officer of Seller.
Service Policy
Knowing that inoperative or defective instruments are as detrimental to TSI attention to any problems. If any malfunction is
discovered, please contact your nearest sales office or representative, or call TSI's Customer Service department at (800) 680-
1220 (USA) or (001 651) 490-2860 (International) or visit www.tsi.com.
Trademarks
TSI and TSI logo are registered trademarks of TSI Incorporated 
trademark registrations. Certifier is a trademark of TSI Incorporated. REDEL is a registered trademark of Interlemo Holding S.A.
Luer-Lok is a registered trademark of Becton Dickinson. Velcro is a registered trademark of Velcro IP Holdings LLC. Phillips is
a trademark of Phillips Screw Company.

v
Contents
Warranty............................................................................................................................................................iii
Contents.............................................................................................................................................................v
CHAPTER 1 Introduction and Parts Identification ................................................................................... 1-1
Introduction...........................................................................................................................................1-1
High Flow Channel ............................................................................................................................1-1
Low Flow Channel.............................................................................................................................1-1
Pressure Measurements....................................................................................................................1-1
Oxygen Concentration.......................................................................................................................1-1
List of Standard Components ...............................................................................................................1-2
CertifierPro Flow Analyzer Test System (Model 4090).................................................................1-2
List of Optional Accessories..................................................................................................................1-3
Flow Resistor Kit (PN 130395) ..........................................................................................................1-4
CertifierConnector Kit (PN 130391)*.............................................................................................1-4
Hanging Clip (PN 130395).................................................................................................................1-4
CHAPTER 2 Flow Analyzer Overview ........................................................................................................ 2-1
Instrument Overview.............................................................................................................................2-1
Model 4090 Instrument, Front............................................................................................................2-1
Model 4090 Instrument, Back............................................................................................................2-1
Model 4090 Instrument, Bottom.........................................................................................................2-2
Operation Overview..............................................................................................................................2-3
Flow Channels...................................................................................................................................2-3
End Caps...........................................................................................................................................2-3
Lithium Ion Batteries..........................................................................................................................2-3
Supplying Power................................................................................................................................2-3
Power Button LED States..................................................................................................................2-3
Touchscreen Display.........................................................................................................................2-4
User Configurations...........................................................................................................................2-4
Data Acquisition and Export ..............................................................................................................2-4
Portable/Rack Mode..........................................................................................................................2-5
Measurements and Units......................................................................................................................2-5
Available Measurement Parameters .................................................................................................2-5
Available Units of Measurement........................................................................................................2-6
Measurement Parameter Definitions.................................................................................................2-7
CHAPTER 3 Flow Analyzer Setup .............................................................................................................. 3-1
Getting Started......................................................................................................................................3-1
Power On/Off.....................................................................................................................................3-1
Initialization and Warm-Up.................................................................................................................3-1
Instrument Setup...................................................................................................................................3-1
Connect Inlet Filters...........................................................................................................................3-1
Connect the Low Pressure Measurement.........................................................................................3-1
Breath Triggers..................................................................................................................................3-2
Connect the CertifierPro to a Ventilator ...........................................................................................3-2
Pre-Test Checks...................................................................................................................................3-4
Flow Measurement............................................................................................................................3-4
Flow Direction Sensor........................................................................................................................3-4
Low-Pressure and High-Pressure Transducer Zeroing.....................................................................3-4
Oxygen Sensor Calibration................................................................................................................3-4
Flow Compare....................................................................................................................................3-4

vi 
CHAPTER 4 Touchscreen Operation .........................................................................................................4-1
Display Interface Overview ...................................................................................................................4-1
Parameter Screen..............................................................................................................................4-1
Warnings and Errors..........................................................................................................................4-3
Graph Screen.....................................................................................................................................4-4
Channel Cards...................................................................................................................................4-5
Menu Screen......................................................................................................................................4-6
Configuring the Analyzer.......................................................................................................................4-6
Measurements and Units...................................................................................................................4-6
Gas Type and Gas Condition.............................................................................................................4-8
Breath Triggers ..................................................................................................................................4-9
Averaging.........................................................................................................................................4-11
Using Configurations...........................................................................................................................4-11
Managing Configurations.................................................................................................................4-12
Loading Configurations....................................................................................................................4-13
Saving Configurations......................................................................................................................4-14
Exporting Configurations..................................................................................................................4-15
Importing Configurations..................................................................................................................4-16
Editing the Graph Screen....................................................................................................................4-16
Plotted Measurements.....................................................................................................................4-17
Y-Axis Scaling..................................................................................................................................4-18
X-Axis Scaling..................................................................................................................................4-18
Trigger Timing..................................................................................................................................4-19
Real-Time Measurements................................................................................................................4-19
Zeroing and Calibration.......................................................................................................................4-20
Zero Pressure Sensors....................................................................................................................4-20
Calibrate Oxygen Sensor.................................................................................................................4-21
Set Installation Date.........................................................................................................................4-22
Data Logging and Export ....................................................................................................................4-23
Data Acquisition...............................................................................................................................4-23
Managing Data.................................................................................................................................4-26
Exporting Data .................................................................................................................................4-28
Viewing Exported Data ....................................................................................................................4-29
Device Settings...................................................................................................................................4-30
General Settings ..............................................................................................................................4-30
Date/Time.........................................................................................................................................4-30
Display/Power Management............................................................................................................4-31
Triggers and Averaging....................................................................................................................4-31
Oxygen Sensor ................................................................................................................................4-31
Device Information..............................................................................................................................4-32
Update Firmware..............................................................................................................................4-32
CHAPTER 5 Troubleshooting......................................................................................................................5-1
CHAPTER 6 Maintenance.............................................................................................................................6-1
Recharging the Battery .........................................................................................................................6-1
Replacing the Battery............................................................................................................................6-1
Battery Calibration .............................................................................................................................6-2
Replacing the Oxygen Sensor..............................................................................................................6-3
Cleaning the Flow Analyzer..................................................................................................................6-3
Factory Calibration (recommended annually).......................................................................................6-4
Return Procedure..................................................................................................................................6-4

Contents vii
CHAPTER 7 Specifications.......................................................................................................................... 7-1
Physical.................................................................................................................................................7-1
Environmental.......................................................................................................................................7-1
Power....................................................................................................................................................7-1
Compliance...........................................................................................................................................7-1
Measurements......................................................................................................................................7-2
CertifierPro Flow Analyzer Pressure Drop.......................................................................................7-4
Low Flow Channel.............................................................................................................................7-4
High Flow Channel ............................................................................................................................7-4
APPENDIX A Data Export Formats ............................................................................................................A-1
Snapshot Data File from the Parameter Screen...................................................................................A-1
Snapshot Data File from the Graph Screen..........................................................................................A-1
Continuous Log file (Initiated from the Parameter Screen or Graph Screen).......................................A-2
Waveform Log file (Initiated from the Parameter Screen or Graph Screen) ........................................A-3

viii 
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1-1
CHAPTER 1
Introduction and
Parts Identification
I n t r o d u c t i o n
The Flow Analyzer is a multi-functional pneumatic test system designed for biomedical
professionals to test respiratory medical equipment such as mechanical ventilators, anesthesia
machines, PAP devices, oxygen concentrators, air-oxygen blenders, and insufflators. 
Pro Flow Analyzer is used in manufacturing, hospital, field service, research, laboratory, and home
care settings.
measures gas flows, volumes, pressures, oxygen
concentration, breath timing, and other breathing parameters. The instrument contains both a high
flow and low flow channel, an integrated oxygen sensor, and a rechargeable lithium-ion battery.
High Flow Channel
The high flow channel measures bi-directional flow rate for air, oxygen (O2), nitrogen (N2) and carbon
dioxide (CO2) over a range of 0 to 300 standard liters per minute (0 to 40 standard L/min for CO2).
Low Flow Channel
The low flow channel measures uni-directional flow rate for air, O2, N2, CO2and nitrous oxide (N2O)
over a range of 0.01 to 20 standard L/min with greater accuracy at low flow rates.
Pressure Measurements
An integrated gauge transducer (150 psi/10 Bar), barometric pressure transducer (375 to
1200 mmHg), and low differential pressure transducer (150 cm H2O) provide multiple pressure
measurements from the front panel.
Oxygen Concentration
An integrated oxygen sensor enables the measurement of oxygenconcentration and air-oxygen gas
flows from the high flow channel. The oxygen sensor is field replaceable by the user.
C A U T I O N
•To avoid inaccurate test readings, DO NOT obstruct the tubing or inlet or outlet
ports, and always use clean, dry gas.
•To avoid damage to the test system components, always use an
inlet filter upstream of the instrument, and always cap ports when not in use.
•If liquid has penetrated any of its components, DO NOT use, and return to the
factory for calibration.
•The test system is not a medical device under the Medical
Device Directive or FDA 510(k) and in no situation should be used for
human measurements.

1-2 
L i s t o f S t a n d a r d C o m p o n e n t s
Carefully unpack the test system components from the shipping container. Check the individual parts
against the packing list and notify TSI®immediately if any parts are missing or damaged.
CertifierPro Flow Analyzer Test System (Model 4090)
Item
Number
Description
Replacement
Part Number
Qty.
1
CertifierPro Flow Analyzer
4090
1
2
High Flow Inlet Filter, 22 mm x 22 mm M/F, HEPA
1602341
1
3
Low Flow Inlet Filter, 1/4 inch, HEPA, plus tubing
1602317
1
4
Adapter, high pressure port
1611221
1
5
Adapter, 22 mm x 6 mm (to connect to Low Flow Filter to
high flow channel using 130373 F/F adapter)
1102091
2
6
Adapter, 15 mm ID x 22 mm OD
1102093
1
7
Adapter, 22 mm F to 22 mm F, Straight
130373
1
8
Adapter, 15 mm M to 22 mm F, Pediatric cuff
130374
1
9
Airway pressure fitting with screen
1611330
1
10
Pressure tubing, silicone, 1/8-inch ID x 1/4-inch OD x 48 in.
3002053
1
11
Power supply 100/240 VAC to +12 VDC 2.1 mm plug,
includes plug set with NA, UK, EU, CN, SAA connectors
130400
1
12
Oxygen sensor cell (installed)
130377
1
13
Battery, 4 cell Lithium-Ion 7.2 V 6.4 AHr (installed)
130385
1
14
Hanging Clip (to hang the instrument from a ventilator rail)
130375
1

Introduction and Parts Identification 1-3
L i s t o f O p t i o n a l A c c e s s o r i e s
Description
Part Number
Image
Carrying Case, Fitted for the
CertifierPro Flow Analyzer
19 x 14.75 x 6.5 inches
(48 x 37.5 x 16.5 cm)
130378
Test Lung, Adult, 1.0L, includes
elbow connector
15 mm ID x 22 mm OD
130396
Test Lung, Pediatric, 0.5L, includes one
elbow connector and two straight
connectors with Luer-Lok®ports and locks,
connectors include a variable leak
adjustment to demonstrate patient-trigger
function or to simulate an airway leak.
130397
Locking Computer Cable, USBC to USBA,
screw lock (2 m), screwdriver
130382
Stylus, Capacitive touch
130370
Oxygen Sensor Cell Replacement (for the
CertifierPro Flow Analyzer)
130377

1-4 
Flow Resistor Kit (PN 130395)
Flow resistors are calibrated airway adapters used to simulate
nominal levels of resistance. Resistors can be used to demonstrate
or test changes in airway resistance. The Flow Resistor Kit
adapters can be cleaned and sterilized.
The kit includes three resistors:
Rp5, Rp20 and Rp50.
CertifierConnector Kit (PN 130391)*
Item
Description
Part Number
Quantity
5
Adapter, 22 mm x 6 mm (to connect Low Flow Filter to High
Flow Channel)
1102091
2
6
Adapter, 15 mm ID x 22 mm OD
1102093
1
7
Adapter, 22 mm F to 22 mm F, Straight
130373
1
8
Adapter, 15 mm M to 22 mm F, Pediatric cuff
130374
1
9
Airway pressure fitting with screen
1611330
1
*All of these conn
Hanging Clip (PN 130395)
Used to hang the Certifier Pro instrument by its handle from a ventilator rail (the Hanging Clip is
included as part of the CertifierPro 4090 Kit).

2-1
CHAPTER 2
Flow Analyzer Overview
I n s t r u m e n t O v e r v i e w
Model 4090 Instrument, Front
1.
Low Flow Channel Inlet
4.
Low Differential Pressure, Positive Port (+)
2.
High Flow Channel Inlet
5.
Low Differential Pressure, Negative Port (-)
3.
High Pressure Port (Max: 150 psi / 10 bar)
6.
Touchscreen Display
Model 4090 Instrument, Back
1.
Low Flow Channel Outlet
7.
USB-C Communications Output
2.
High Flow Channel Outlet
8.
Screw hole for USB-C cable lock
3.
Power Button (On/Off)
9.
USB-A Connectors (2)
4.
RS-232 Output
10.
Portable / Rack Switch
5.
TTL Trigger Input
11.
Cable Retainer
6.
DC Power Input (2.1mm barrel jack)
12.
Model / Serial Number Sticker

2-2 
Model 4090 Instrument, Bottom
1.
Battery/Oxygen Sensor Cover
4.
Rubber Feet
2.
Cover Knob
5.
Fan
3.
Instrument Handle
6.
Cable Retainer

Flow Analyzer Overview 2-3
O p e r a t i o n O v e r v i e w
Flow Channels
Measurements from both flow channels are available for simultaneous use. You can connect or
disconnect your test circuit to or from the  Pro Flow Analyzer at any time during normal
operation without having to reboot the instrument or change settings. You can turn off the individual
flow channels to reduce power consumption and extend battery operation. See Chapter 4, "Flow
Channel Power Toggles" for more information on disabling power for flow channels.
The high flow channel measures flows up to 300 L/min using bi-directional flow sensing. The low flow
channel can measure flows under 2.5 L/min with greater accuracy than the high flow channel. The low
flow channel uses uni-directional flow sensing and reports all measured flows as positive values. The
low flow channel contains the N2O gas type which is often used for testing anesthesia work stations.
End Caps
TSI®flow analyzers measure flow utilizing an exposed thermal flow sensor that is highly sensitive to
foreign matter and particles within the gas flow. TSI®supplies end caps for both the high flow and low
flow channels and recommends that the flow inlets and outlets be capped when not in use.
C A U T I O N
To avoid damage to the Test System components, always cap the ends
of the flow inlets/outlets when not in use.
Lithium Ion Batteries
The CertifierPro Flow Analyzer utilizes a 4-cell lithium ion battery pack which can provide up to six
(6) hours of continuous operation from a full charge. The battery pack is calibrated and installed into
the instrument at the factory. The battery pack is rechargeable and can be charged internally by
providing power via the AC power adapter. The battery pack can be replaced by users in the field.
Supplying Power
The Certifier Pro Flow Analyzer can be powered by internal Lithium-Ion batteries or an AC power
adapter can be used. Refer to Chapter 7 of this manual for the power supply specifications.
If the AC adapter is delivering power to the flow analyzer with the battery installed, the battery symbol
on the display will contain a lightning bolt to indicate that the battery is being charged. If the AC
adapter is powering the instrument but no battery is installed, a question mark symbol will appear
within the battery symbol.
NOTICE
When running the Certifier Pro Flow Analyzer on battery power without an AC connection, the
device will shut down automatically if the battery charge reaches 5% in order to prevent battery
damage from occurring.
Power Button LED States
The power button contains an LED that changes state and color depending on the condition of the
Certifier Pro instrument. If the Certifier Pro Flow Analyzer is running with the battery installed while
connected to power via the power cable, then the power button will display the following LED states:
•Blinking red: 010% battery charge
•Solid red: 1020% battery charge
•Solid green: >20% battery charge

2-4 
If the Flow Analyzer is turned off with the battery installed while connected to power via
the power cable, the power button will display the following LED states:
•Solid yellow: Battery is charging
•Blinking yellow: Battery is full, no charging needed
If no battery is installed and the Flow Analyzer is connected to power via the power
cable, the power button will display a solid green LED when the instrument is powered on. The
power button will not display any LED status if the Certifier Flow Analyzer is turned off and no power
is connected.
Touchscreen Display
The Flow Analyzer utilizes a 5-inch color, capacitive touchscreen display. The Certifier
graphical user interface (GUI) is designed to be operated using your fingers; however, a capacitive-
touch stylus can also be used as an alternative. Press with your fingers lightly on the display for
optimal touchscreen operation.
To operate the Certifier Pro test system, touch any on-screen element that you would like to
change. Between 1 and 18 measurement parameters can be displayed on screen at one time,
and the display will automatically adjust the font and positioning of the text based on the number
of measurements selected. The display brightness can be adjusted in the Settings option of the
Certifier Pro user interface.
User Configurations
A user configuration is a collection of setting values for the measurements, units, gas type and
conditions, triggering, and graph settings that can be saved and recalled at a later time. This allows
you to save and load different test setups for specific models of equipment or to ensure test setups
conform with organizational standards or personal preference.
Up to 20 different user configurations can be stored in the internal memory of the Certifier Pro
Model 4090 Flow Analyzer and can be exported from either USB-A port on the back of the instrument
to a USB mass storage device. Exported user configurations can then be imported onto other
Certifier Pro Model 4090 or Certifier Plus Model 4089 instruments. Exported configurations can also
be sent as email attachments.
Data Acquisition and Export
The Flow Analyzer is capable of logging measurement data and capturing screenshots.
Files are saved to the internal memory of the  Flow Analyzer and can be exported through
either of its two USB-A ports. Saved measurement data is exported as .csv files and screenshots are
exported as .png files.
The Flow Analyzer offers the following data acquisition options:
•Snapshot saves a screenshot image and the data currently displayed, either from the Parameter
screen or Graph screen. Upon executing a snapshot, the Certifier Flow Analyzer will create two
files, an image file (.PNG) for the screen capture and a data file (.CSV) with a single data point.
•Continuous Log captures data for the measurements currently selected on screen. The
sampling rate at which data is collected can be set from 1 second to 10 minutes. The collection
time can be set from 15 seconds to up to 5 days (120 hours) of continuous logging.
•Waveform Log records raw sensor data at high resolution for flow rate, low pressure, high
pressure, absolute pressure, temperature, and oxygen concentration (if connected). The sampling
rate for waveform logging is fixed at 1 ms (1000 Hz), and you can specify the collection time from
15 to 60 seconds.

Flow Analyzer Overview 2-5
Portable/Rack Mode
In Portable mode, the instrument will run on battery power if no power is supplied. In Rack mode, the
instrument will turn on when power is supplied and turn off when power is removed.
NOTICE
will not allow you to cancel the auto shutdown
process if no power is supplied.
M e a s u r e m e n t s a n d U n i t s
Available Measurement Parameters
Some of the parameters listed are only available from the high flow channel.
Symbol
Description
Symbol
Description



Flow rate
PPLAT
Plateau pressure pressure at
the end of the inspiratory phase
during no flow (4081 only)


PEAK
Peak flow rate Peak inhaled
flow rate
PHIGH
High pressure measurement
(4081 only)


MIN
Minimum flow rate the negative
of the peak exhaled flow rate in a
bi-directional test circuit.
PABS
Absolute pressure in flow tube.
Equals barometric pressure if
flow tube is open to atmosphere.



Flow rate delta the numerical
difference in flow rates.
O2
Oxygen concentration
measurement (4081 with
4073 only)


%
Flow rate delta percent the
difference in flow rates by %.
T
Flow tube temperature
measurement.
VTI
Inhaled tidal volume
f
Breath frequency
VTE
Exhaled tidal volume
tI
Inspiratory time
V
Real-time volume
tIP
Inspiratory pause time
MV
Inhaled minute tidal volume
tI+P
Inspiratory time including
pause time
P
Low pressure measurement
(4081 only)
tR
Inspiratory rise time amount of
time from the start of breath to
the max flow rate.
PIP
Peak inspiratory pressure
(4081 only)
tE
Expiratory time
PEEP
Peak end expiratory pressure
(4081 only)
I:E
Inspiratory to Expiratory ratio
PMAP
Mean airway pressure
(4081 only)
I:EIP
Inspiratory to Expiratory ratio
including pause time.
PMIN
Minimum low pressure
(4081 only)
CSTAT
Static compliance calculated
as Tidal volume / (plateau
pressure PEEP).
P
Delta low pressure Delta
airway pressure (4081 only)

Time of day

2-6 
Available Units of Measurement
Measurement
Factory Default Units
Optional User-Selectable Units


, 

PEAK, 

MIN
L/min
mL/min, mL/s
VTI,VTE,V, MV
L
mL, L
P, PIP, PEEP,PMAP, PMIN,
P,PPLAT
cmH2O
Pa, kPa, mbar, PSI, inH2O,
mmHg
PHIGH
PSI
kPa, bar
PABS
kPa
Pa, hPa, mbar, bar, PSI, cmH2O,
inH2O, mmHg
O2
% oxygen
-
T
oC
oF
f
1/min
Hz
tI,tIP,tI+P,tE,tR
s
-

Flow Analyzer Overview 2-7
Measurement Parameter Definitions
Pressure (P)
Flow rate (

)

2-8 
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