Care Fusion Bird Sentry User manual

Bird Sentry™ Blender
User’s Guide

Bird Sentry™ Blender
ii L1383 Rev. D
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USA
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Yorba Linda, California 92887-4668
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Literature number: L1383 Revision D

Bird Sentry™ Blender
L1383 Rev. D iii
Revision History
Date Revision Description
February 1997 A Initial release.
March 1997 B
January 1998 C
September 2010 D Rebranded the document to the CareFusion style.

Bird Sentry™ Blender
iv L1383 Rev. D
Warranty
THE BIRD SENTRY™ BLENDER IS WARRANTED TO BE FREE FROM DEFECTS IN MATERIAL AND
WORKMANSHIP AND TO MEET THE PUBLISHED SPECIFICATIONS FOR ONE (1) YEAR.
The liability of CareFusion under this warranty is limited to replacing, repairing or issuing credit, at the
discretion of CareFusion, for parts that become defective or fail to meet published specifications during the
warranty period; CareFusion will not be liable under this warranty unless (A) CareFusion is promptly
notified in writing by Buyer upon discovery of defects or failure to meet published specifications; (B) the
defective unit or part is returned to CareFusion, transportation charges prepaid by Buyer; (C) the defective
unit or part is received by CareFusion for adjustment no later than four (4) weeks following the last day of
the warranty period; and (D) examination by CareFusion of such unit or part shall disclose, to its
satisfaction, that such defects or failures have not been caused by misuse, neglect, improper installation,
unauthorized repair, alteration or accident.
Any authorization of CareFusion for repair or alteration by the Buyer must be in writing to prevent voiding
the warranty. In no event shall CareFusion be liable to the Buyer for loss of profits, loss of use,
consequential damage or damages of any kind based upon a claim for breach of warranty, other than the
purchase price of any defective product covered hereunder.
CareFusion warranties as herein and above set forth shall not be enlarged, diminished or affected by, and
no obligation or liability shall arise or grow out of the rendering of technical advice or service by CareFusion
or its agents in connection with the Buyer's order of the products furnished hereunder.
Limitations of Liabilities
This warranty does not cover normal maintenance such as cleaning, adjustment or lubrication and
updating of equipment parts. This warranty shall be void and shall not apply if the equipment is used with
accessories or parts not manufactured by CareFusion or authorized for use in writing by CareFusion, or if
the equipment is not maintained in accordance with a prescribed schedule of maintenance.
The warranty stated above shall extend for a period of one (1) year from date of shipment with the
following exceptions:
1. Components for monitoring of physical variables such as temperature, pressure, or flow are warranted
for ninety (90) days from date of receipt.
2. Elastomeric components and other parts or components subject to deterioration, over which CareFusion
has no control, are warranted for sixty (60) days from date of receipt.
THE FOREGOING IS IN LIEU OF ANY WARRANTY, EXPRESSED OR IMPLIED, INCLUDING, WITHOUT
LIMITATION, ANY WARRANTY OF MERCHANTABILITY, EXCEPT AS TO TITLE, AND CAN BE AMENDED
ONLY IN WRITING.BY A DULY AUTHORIZED REPRESENTATIVE OF CareFusion.

Bird Sentry™ Blender
L1383 Rev. D v
EMC Notice
This equipment generates, uses, and can radiate radio frequency energy If not installed and used in
accordance with the instructions in this manual, electromagnetic interference may result. The
equipment has been tested and found to comply with the limits set forth in IEC 601-1-2 for
Medical Products. These limits provide reasonable protection against electromagnetic interference
when operated in the intended use environments described in this manual.
MRI Notice
This equipment contains electromagnetic components whose operation can be affected by intense
electromagnetic fields.
Do not operate the Bird Sentry blender unattended in an MRI environment or in the vicinity of high-
frequency surgical diathermy equipment, defibrillators, or shortwave therapy equipment.
Electromagnetic interference could disrupt the operation of the Bird Sentry blender.
Regulatory Notice
Federal law restricts the sale of this device except by and on order of a physician.
Declaration of Conformity Notice
This medical equipment complies with the Medical Device Directive, 93/42/EEC, and the following
Technical Standards, to which Conformity is declared:
IEC 601-1-2
IEC 601-1-2: 1993
ISO 9001: 1994
EN 46001, MDD-Annex-II
Type of Equipment: Medical Equipment, O2
Blender/Monitor
Trade name: Bird Sentry
Model No.: 15625 Series
If you have any questions regarding the Declaration of Conformity for this product, please contact
CareFusion Corporation.

Bird Sentry™ Blender
vi L1383 Rev. D
Read this entire manual before attempting to operate or service the Bird Sentry™
blender:
Attempting to operate the Bird Sentry blender without fully understanding its features and
functions may result in unsafe operating conditions.
Read the Safety Information section. It lists warnings, cautions, and notes pertinent to the safe
servicing of the Bird Sentry blender.
If you have a question regarding the installation, setup, operation, or maintenance of the Bird
Sentry blender, contact customer service at the following numbers:
Technical Support
Hours: 7:00 a.m. to 4:30 p.m. (PST), Monday through Friday
Tel.: [phone] or 800.231.2466
(Follow the prompts to technical support.)
Fax: [phone]
[e-mail]
CareFusion Helpline
Hours: 24 hours, 7 days a week
Tel.: [phone] or 800.328.4139

Bird Sentry™ Blender
L1383 Rev. D vii
Safety Information
Review the following safety information before operating the Bird Sentry blender:
Definitions
Warning! Identifies a condition or practice that could result in serious adverse reactions or
potential safety hazards.
Caution! Identifies a condition or practice that could result in damage to the Bird Sentry blender
or other equipment.
Note: Identifies supplemental information to help you better understand how the Bird Sentry
blender works.
Warnings
The following warnings apply any time you operate or service the Bird Sentry blender:
●To avoid explosion, do not operate the Bird Sentry blender in the presence of flammable
anesthetics or in an atmosphere of explosive gases. Operating the Bird Sentry blender in
flammable or explosive atmospheres may result in fire or explosion.
●Do not operate the Bird Sentry blender unless qualified personnel are in attendance to promptly
respond to alarms, inoperative conditions, or sudden malfunctions. Patients on life-support
equipment should be visually monitored at all times.
●Do not ignore audible alarms occurring by the Bird Sentry blender. Alarms indicate conditions
that require your immediate attention.
●Do not use parts, accessories, or options that have not been authorized for use with the Bird
Sentry blender. Using unauthorized parts, accessories, or options may be harmful to the patient
or damage the Bird Sentry blender.
●Check all audible and visual alarms daily to make sure they are operating properly. If an alarm
fails to activate, contact your CareFusion Certified Service Technician.
●Consult a physician to determine concentration of inspired oxygen to be delivered.
●Do not operate the Bird Sentry blender without setting the adjustable alarms. All adjustable
alarms must be set to ensure safe operation.
●Explosion hazard. DO NOT gas sterilize the Bird Sentry blender.
●DO NOT steam autoclave or otherwise subject the Bird Sentry blender to temperatures above
122°F (50°C).
●If the air or oxygen gas source fails, the pressure differential alarm will sound alerting the
clinician that a condition has occurred that may significantly alter the FIO, and flow output from
the Bird Sentry blender.
●If either the air or oxygen source pressure is reduced or increased sufficiently to create a
pressure differential of 20 PSI or more, an audible alarm will sound. This condition may
significantly alter the FIO and flow output from the Bird Sentry blender.
●DO NOT use humidified oxygen to calibrate this system. If calibrated with humidified oxygen,
subsequent oxygen readings will be higher than the true oxygen level.

Bird Sentry™ Blender
viii L1383 Rev. D
●DO NOT tape, obstruct or remove the reed alarm during clinical use.
●DO NOT occlude the sensor port on the side of the Bird Sentry blender.
●Do not routinely disconnect or remove O2sensors from the Bird Sentry blender. If the sensor
must be disconnected, the full "warm-up" period, as stated in the sensor specifications, may be
required after the sensor is reconnected.
●The mixed gas bleed continuously bleeds to atmosphere at the oxygen concentration setting of
the control knob. Bleeding oxygen into any closed area could increase the risk of fire or
explosion. Do not operate this device in the presence of any flame or source of ignition; or
when using devices such as electrosurgical equipment or defibrillators.
Cautions
●Do not attempt to clean the Bird Sentry blender with cleaning agents that contain phenols,
ammonia chloride, or chloride compounds, or that contain more than 2% glutaraldehyde.
These agents may damage the plastic components and control panel overlays.
●Dropping or severely jarring the sensor after calibration may shift the calibration point enough
to require recalibration.
●Using the Bird Sentry blender to analyze and monitor oxygen concentrations other than at the
sensor port of the unit will require recalibration of the sensor.
●Always operate the Bird Sentry blender with clean, dry medical grade gases. Contaminates or
moisture can cause defective operation. Oxygen should have a minimum dew point of -80°F (-
62°C) or moisture content less than 7.9 PPM (0.0059mg/L). Oxygen "purity" should be at least
99.6% and air used should be medical grade. Water vapor content must not exceed a dew
point of 5°F (3°C) below the lowest ambient temperature to which the delivery system is
exposed. Particulate content must not exceed that which would be found immediately
downstream of a 15 micron absolute filter. Refer to CGA commodity specifications G-4.3 and
G7.1 for more information. Water vapor content of medical air or 0, supply to the blender must
not exceed 5.63 x 103 milligrams H2O per cubic meter of non-condensable gas.
●When disassembling, care must be exercised to prevent damaging the printed circuit board. All
work must be accomplished in a static safe environment.
●This device has not been tested in the presence of gases other than air or oxygen.
Notes
●The Bird Sentry blender is tested for compliance with ISO 11195:1995, clause 6, and meets
requirements regarding reverse gas flow as delivered.
●Applicable parts used in the Bird Sentry blender have been cleaned and degreased for oxygen
service. Any lubricants used are designed specifically for the application. Do not use anything
other than CareFusion specified lubricants when servicing the Bird Sentry blender.
●As long as the total pressure of the gas mixture being monitored is constant, the Bird Sentry
blender will accurately read oxygen concentrations. However, if the total pressure varies the
reading will fluctuate proportionately as the sensor actually measures the partial pressure of
oxygen in the mixture. The sensor readings will also change proportionately with barometric
pressure changes. Because of this, daily calibration of the sensor is recommended.

Bird Sentry™ Blender
L1383 Rev. D ix
●Users are advised to use pressure regulators, set to 50 ±5 PSIG(3.4± .4 BAR), which display
system pressure.
●All specifications assume the following standard environ mental conditions, unless specified
otherwise. Ambient and sample gas temperatures of 77°F (25°C); barometric pressure of 30:Hg
(760mmHg); sea level altitude; ambient relative humidity of 50%; sample gas relative humidity
of 0%
●It is important to note that the oxygen concentration selection scale is provided only as a
guideline for selecting 0, concentrations. The clinician should use the display panel of the Bird
Sentry blender to adjust the O2concentration to the desired setting.
Equipment Symbols
The following symbols appear on the Bird Sentry blender.
Symbol Compliance Meaning
IEC 578
Symbol #03- O2
Attention, consult the accompanying
documents.
IEC 417
Symbol #5016
Fuse
IEC 417
Symbol #5034
Input
IEC 878
Symbol #01-08
Standby (circuitry off) position of the
On/Off switch. It does NOT switch the
blenders mixing ability to turn power
off.
IEC 878
Symbol #01-07
On condition for the display circuitry
of the equipment.
CareFusion products symbol Lock (used to prevent accidental
changes to set values.)
The front panel Lock icon is
illuminated when the control panel is
locked.
CareFusion product symbol Silence condition of the audible alarm
for a period of up to two minutes
(120 sec.)

Bird Sentry™ Blender
xL1383 Rev. D
Bird Sentry™ Blender

Bird Sentry™ Blender
L1383 Rev. D xi
Contents
Revision History.............................................................................................................. iii
Warranty ....................................................................................................................... iv
Limitations of Liabilities .................................................................................................. iv
EMC Notice .................................................................................................................... v
MRI Notice...................................................................................................................... v
Regulatory Notice............................................................................................................ v
Declaration of Conformity Notice .................................................................................... v
Technical support........................................................................................................... vi
CareFusion helpline........................................................................................................ vi
Safety Information .........................................................................................................vii
Chapter 1: Introduction.......................................................................................................1
Intended Use ..................................................................................................................1
Front Panel Functional Description ...................................................................................2
Bottom View...................................................................................................................4
Disposable Galvanic O2Sensor.........................................................................................5
What You Will Need to Operate the Blender ....................................................................6
What to Do If the Blender Fails ........................................................................................6
How to Get Help.............................................................................................................6
Chapter 2: Operating Procedures.........................................................................................7
Monitoring .....................................................................................................................7
Alarm Setting Procedure..................................................................................................7
Basic Operation...............................................................................................................8
Alarms and Conditions....................................................................................................8
Calibration Procedures ....................................................................................................9
Automatic Calibration to Known Concentration.............................................................10
Chapter 3: Pressure Differential Alarm/Bypass Check..........................................................11
Chapter 4: Troubleshooting...............................................................................................13
Chapter 5: Cleaning the Bird Sentry Blender ......................................................................15
Chapter 6: Servicing and Maintaining the Bird Sentry Blender.............................................17
Maintenance.................................................................................................................17
Disposable Galvanic O2Sensor Cable .............................................................................17
Servicing.......................................................................................................................18

Bird Sentry™ Blender
xii L1383 Rev. D
Chapter 7:Appendices...................................................................................................... 19
Glossary .......................................................................................................................19
Specifications................................................................................................................19
Setup and Installation ...................................................................................................21
Theory of Operations ....................................................................................................22
Flow Characteristics ......................................................................................................25

Bird Sentry™ Blender
L1383 Rev. D 1
Chapter 1: Introduction
The Bird Sentry blender is a compact air/oxygen gas mixing device which incorporates the use of a
battery powered oxygen analyzer/monitor. The gas mixing device (blender) provides for precise mixing
of medical grade air and oxygen, while the analyzer measures the selected oxygen concentrations from
the blender's gas flow and samples and displays these measured concentrations on a digital display.
The monitor provides high and low alarm limits which, when exceeded, cause an audible/ visual alarm
to activate.
The Bird Sentry blender design allows for a wide scope of applications including:
●Free-flow oxygen administration
●Mechanical ventilation of adults, pediatrics, and neonates.
●Continuous Positive Airway Pressure (CPAP)
Intended Use
The Bird Sentry blender is designed to provide a continuous air/oxygen gas mixture to infant, pediatric,
and adult patients. It is a restricted medical device intended for use by qualified, trained personnel,
under the direction of a physician, in institutional environments where the delivery and monitoring of
air/oxygen mixtures is required.

Chapter 1: Introduction Bird Sentry™ Blender
2L1383 Rev. D
Front Panel Functional Description
A Display
A digital liquid crystal display provides direct readout of oxygen concentrations in the range of 0 to
100%. It also displays CAL when the calibration mode is entered.
B Battery Low Indicator
The low battery indicator appears on the LCD display when the power supply voltage drops below
acceptable limits. When the LOW BAT icon is visible, the batteries should be replaced.
Figure 1 Front panel
C % Sign
In the calibration mode, the% sign flashes every second.
D Power ON/OFF Key
This key is used to turn on or off. The blender will continue to function and deliver mixed gas with
display turned to OFF. When the ON/OFF key is pressed once, the Bird Sentry blender will start to
display the oxygen concentration and the keypad is activated. If the ON/OFF key is pressed again,
the Bird Sentry blender reverts to the display power off mode.
E Lock Key
Pressing the LOCK key will unlock the keypad and cause the LOCKED icon to disappear from the
LCD readout. The Bird Sentry blender can then be calibrated and alarm settings can be changed if
desired. If no other keys are pressed within 10 seconds, the LOCKED icon will reappear and the
unit will revert to the LOCKED mode. When the unit is in the unlocked state, pressing the LOCK
key will also cause the LOCKED icon to reappear.

Bird Sentry™ Blender Chapter 1: Introduction
L1383 Rev. D 3
F Calibrate Key
When the keypad is unlocked, the CAL key is used in conjunction with the UP and DOWN arrow
keys to calibrate the Bird Sentry blender. When the CAL key is pressed, CAL appears on the LCD
readout for one second, and then the measured calibration. The % sign will flash at a one per
second rate. When the calibration value is set, pressing the CAL or LOCK key will cause the unit to
exit the calibrate mode and return to normal operation. The unit will also revert to normal
operation if 10 seconds elapse and no keys are pressed.
G Up and Down Arrow Keys
The UP and DOWN arrow keys are used to adjust settings or to calibrate the Bird Sentry blender.
When used after pressing the CAL key, pressing these keys raise or lower the displayed oxygen
value in 0.1% increments. When either of these keys is held down for more than one second, the
display scrolls at a rate of 0.4% per second. When used after pressing either the LOW SET or HIGH
SET keys, pressing the UP or DOWN arrow key raises or lowers the displayed alarm setting in 1%
increments. In the alarm set mode, holding these keys down for more than one second causes the
display to scroll at a rate of 4% per second.
H LOW SET Key
When the keypad is unlocked, pressing the LOW SET key will cause the LOW icon to flash. The low
alarm setting can then be changed using the UP and DOWN arrow keys. When the low alarm
value is set and the LOW SET or LOCK key is pressed again, the Bird Sentry blender exits the alarm
set mode and returns to normal operation. The Bird Sentry blender will also revert to normal
operation (storing the most recent alarm value) if 10 seconds elapse and no keys are pressed.
I HIGH SET Key
When the keypad is unlocked, pressing the HIGH SET key will cause the HIGH icon to flash. The
high alarm setting can then be changed using the UP and DOWN arrow keys. When the high
alarm value is set and the HIGH SET or LOCK key is pressed again, the unit exits the alarm set
mode and returns to normal operation. The unit will revert to normal operation (storing the most
recent alarm value) if 10 seconds elapse and no keys are pressed.
J Silence Key
In an alarm condition, pressing the SILENCE key will deactivate the alarm beep, but the alarm LED
and display will continue to flash. In 120 seconds, the alarm beeper will sound again. This process
will be repeated until the alarm condition is cancelled. The concentration must be raised 0.1%
higher than the alarm setting (in the presence of a low alarm condition) or 0.1% lower than the
alarm setting (in the presence of a high alarm condition).
K High Alarm Visual Display
A red indicator light which illuminates when the high alarm limit has been exceeded.
L Low Alarm Visual Display
A red indicator light which illuminates when the low alarm limit has been exceeded.
M High Alarm Display
The high alarm setting is displayed at all times just below the HIGH icon on the LCD readout. The
indicated value represents the oxygen percentage at which the high alarm will be activated in the
High Alarm Set mode. The high icon will flash at a one-second rate. The high alarm value will flash
in conjunction with the high alarm LED.

Chapter 1: Introduction Bird Sentry™ Blender
4L1383 Rev. D
N Low Alarm Display Control
The low alarm setting is displayed at all times just below the LOW icon on the LCD readout. The
indicated value represents the oxygen percentage at which the low alarm will be activated. In the
Low Alarm Set mode, the LOW icon will flash at a one-second rate. In a low alarm condition, the
low alarm value will flash in conjunction with the low alarm LED.
O Outlet Port
A diameter indexed (DISS) oxygen fitting that, when connected with a pneumatic metering device
(such as a flow meter or ventilator), delivers flows from the Bird Sentry blender from 2–100 LPM.
P Medical Air Inlet Connector
A diameter indexed (DISS) air fitting for connection to an air-inlet hose from the air-gas source.
Q Oxygen Inlet Connector
A diameter indexed (DISS) oxygen fitting for the connection of an oxygen-inlet hose from the
oxygen-gas source.
R Oxygen Concentration Selector Control
A knob that allows selections of mixed oxygen concentrations from 21 to 100%.
Note:
The oxygen-concentration selection scale is provided only as a guide for selecting O2
concentrations. You should use the Bird Sentry blender display panel to adjust the O2
concentration as needed.
Bottom View
A Dovetail Mount Adapter
An adapter that allows the Bird Sentry blender to be mounted onto a mating bracket for
mounting to a rail or ventilator system.
Figure 2 Bottom view

Bird Sentry™ Blender Chapter 1: Introduction
L1383 Rev. D 5
B Outlet Port
See Figure 1, letter O.
C O2Sensor Port
A sampling port for the oxygen sensor. It allows 3 LPM of mixed gas from the blender to flow over
the sensor membrane. The port is located on the back side of the plate.
D Medical Air Inlet Adapter
See Figure 1, letter P.
E Oxygen Inlet Adapter
See Figure 1, letter Q.
F Pressure Differential Reed Alarm Cap
An audible alarm that, when activated, indicates that a pressure differential of 20 PSI or more
exists between the two gas-source pressures.
Disposable Galvanic O2Sensor
The sensor is a galvanic, partial pressure sensor that is specific to oxygen. It consists of two electrodes
(a cathode and an anode), a Teflon membrane and an electrolyte. Oxygen diffuses through the Teflon
membrane and immediately reacts at a gold cathode. Oxygen ions are transported in the unique
electrolyte solution to a lead anode where oxidation occurs, generating an electrical current. Since the
sensor is specific to oxygen, the current generated is proportional to the amount of oxygen present in
the sample gas. When no oxygen is present, there is no chemical reaction and therefore, no current is
produced. In this sense, the sensor is self-zeroing.
Figure 3 Disposable galvanic O2cell
A Disposable Galvanic O2Cell (Refer to Figure 3)
A replaceable cartridge which contains the active elements of the galvanic oxygen sensor. When
exhausted, the cell is discarded and replaced with a new cell.

Chapter 1: Introduction Bird Sentry™ Blender
6L1383 Rev. D
What You Will Need to Operate the Blender
● Pressurized Oxygen . The compressed oxygen source must provide clean and dry, medical grade
oxygen at a line pressure of 40 to 60 PSIG (2.8 to 4.2 bar).
●
Pressurized Air . The air source must provide clean and dry, medical grade air at a line pressure of 40
to 60 PSIG (2.8 to 4.2 bar).
What to Do If the Blender Fails
If a condition is detected that could possibly prevent the blender from continuing to operate safely, it
sounds an alarm. If at any time, ERX (Er1, Er4, etc.) appears on the LCD, contact a service technician,
certified by CareFusion.
Warning!
Do not operate the blender unless qualified personnel are in attendance to promptly respond to
alarms, inoperative conditions, or sudden malfunctions.
How to Get Help
If you have a question regarding the installation, setup, operation, or maintenance of the Bird Sentry blender,
contact customer service at the following numbers:
Technical support:
Hours: 7:00 a.m. to 4:30 p.m. (PST), Monday through Friday
Tel. [phone]
(Follow the prompts to technical support.)
Fax [phone]
[e-mail]
CareFusion helpline:
Hours: 24 hours, 7 days a week
Tel. [phone] or 800.328.4139

Bird Sentry™ Blender
L1383 Rev. D 7
Chapter 2: Operating Procedures
Before placing the Bird Sentry blender into clinical use, the performance check described in Chapter 3
should be performed. Refer to Appendix C for Setup and Installation.
Monitoring
To begin monitoring, press the ON/OFF button located on the front panel (if necessary). Monitoring will
begin immediately.
Should oxygen level exceed either the HIGH or LOW alarm set points, the red alarm indicator on the
front panel will illuminate indicating either a high or low concentration reading, and an oxygen level
returns to within limits or the limits are adjusted.
To conclude monitoring, press the ON/OFF button located on the front panel.
This will place the blender in a standby mode in which the display and alarm circuits are not functional,
but the gas-blender supply hoses will continue to supply mixed gas if the inlet hoses have not been
disconnected.
Alarm Setting Procedure
Low Alarm Setting
To adjust the low alarm setting:
1. Press the LOCK key to unlock the keypad.
2. Press the LOW SET key. The LOW icon will start to flash.
3. Use the UP and DOWN arrow keys to set the low alarm to the desired value. Pressing the arrow
keys changes the value in 1% increments. If the keys are held down for more than 1 second, the
display will scroll at a rate of 4% per second.
Note:
If 10 seconds elapse between key actuations, the system will store the latest low alarm
value and will revert to normal operation. If this occurs inadvertently, simply repeat the
alarm-setting procedure.
The low alarm value cannot be set lower than 18%, nor can it be set closer than 1% from the
high alarm value. For example, if the high alarm is set at 25%, the system will not accept a low
alarm setting greater than 24%.
4. When the low alarm value is set, press the LOW SET or LOCK key again to accept the low alarm
setting and return to normal operation.
Note:
To automatically set the low alarm to 18% without scrolling the display, hold the LOW SET
key down and press the arrow key when the LOW icon is flashing.

Chapter 2: Operating Procedures Bird Sentry™ Blender
8L1383 Rev. D
High Alarm Setting
To adjust the high alarm setting:
1. Press the LOCK key to unlock the keypad.
2. Press the HIGH SET key. The HIGH icon will start to flash.
3. Use the UP and DOWN arrow keys to set the high alarm to the desired value.
The high alarm value cannot be set closer than 1% from the low alarm value. For example, if the
low alarm is set at 50%, the system will not accept a high alarm setting less than 51%. Setting the
high alarm to 100% turns off or deactivates the high alarm.
4. When the high alarm value is set, press the HIGH SET key again to accept the high alarm setting
and return to normal operation.
Note:
To automatically set the high alarm to 50% without scrolling the display, hold the HIGH
SET key down, and then press the DOWN ARROW key when the HIGH icon is flashing. To
automatically turn off the high alarm or set it to 100%, hold the HIGH SET key down and
then press the UP ARROW key when the HIGH icon is flashing.
Basic Operation
To check the oxygen concentration of a sample gas:
1. Place the sensor probe in the sensor port on the Bird Sentry blender. If using a standard T adapter
in an alternate location, make sure the sensor is mounted in the adapter with the flow diverter
pointing downward. This will prevent moisture from draining into the sensor membrane.
Note:
It is important that a tight fit exists between the probe and the T adapter
2. Initiate flow of the sample gas to the sensor.
3. Using the ON/OFF key, make sure the Bird Sentry blender is in the Power On mode.
4. Allow the oxygen reading to stabilize. This will normally take about 30 seconds or more.
Alarms and Conditions
In the event of either a low-alarm or high-alarm condition, the corresponding LED will begin to flash,
accompanied by the alarm buzzer. Pressing the SILENCE key will deactivate the buzzer, but the LED and
the alarm value digits on the display will continue to flash until the alarm condition has been rectified.
If the alarm condition still exists 120 seconds after silencing the alarm buzzer, the buzzer will start to
sound again.
Note:
A low alarm condition will remain until the actual concentration is 0.1% higher than the low
alarm setting. A high alarm condition will remain until the actual concentration is 0.1% lower
than the high alarm setting.