Bird Sentry Blender Users Guide Rev D Sept 2010

Bird Sentry™ Blender

This document is protected by United States and International Copyright laws. This document may not be copied, reproduced, translated, stored in a retrieval system, transmitted in any form, or reduced to any electronic medium or machine-readable form, in whole or in part, without the written permission of CareFusion. Information in this document is subject to change without notice. This document is for informational purposes only and should not be considered as replacing or supplementing the terms and conditions of the License Agreement. © 1997–2010 CareFusion Corporation or one of its subsidiaries. All rights reserved. The CareFusion logo and Bird Sentry are trademarks or registered trademarks of CareFusion Corporation or one of its subsidiaries. All other trademarks are the property of their respective owners. USA CareFusion 22745 Savi Ranch Parkway Yorba Linda, California 92887-4668

Authorized European Representative CareFusion Germany 234 GmbH Leibnizstrasse 7 97204 Hoechberg, Germany District Court Wuerzburg HRB7004

800.231.2466 tel +1.714.283.2228 tel +1.714.283.8493 fax

+49.931.4972.0 tel +49.931.4972.423 fax

carefusion.com

Literature number: L1383 Revision D

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Rev ision History Date

Revision

Description

February 1997

A

Initial release.

March 1997

B

January 1998

C

September 2010

D

L1383 Rev. D

Rebranded the document to the CareFusion style.

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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.

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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 highfrequency 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.

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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.: 714.283.2228 or 800.231.2466 (Follow the prompts to technical support.) Fax: 714.283.8471 [email protected]

CareFusion Helpline Hours: 24 hours, 7 days a week Tel.: 800.231.2466 or 800.328.4139

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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.

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●

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 O2 sensors 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

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●

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.

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●

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 O2 concentration to the desired setting.

Equipment Symbols The following symbols appear on the Bird Sentry blender. Symbol

L1383 Rev. D

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.)

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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 O2 Sensor ... 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 O2 Sensor Cable ... 17 Servicing ... 18

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Chapter 7:

Appendices... 19

Glossary ... 19 Specifications... 19 Setup and Installation ... 21 Theory of Operations ... 22 Flow Characteristics ... 25

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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.

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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

2

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.

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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.

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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

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Chapter 1: Introduction

B

Outlet Port See Figure 1, letter O.

C

O2 Sensor 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 Galv anic O 2 Sensor 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 O2 cell A

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Disposable Galvanic O2 Cell (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.

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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. 714.283.2228 (Follow the prompts to technical support.) Fax 714.283.8471 [email protected] CareFusion helpline: Hours: 24 hours, 7 days a week Tel. 800.231.2466 or 800.328.4139

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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.

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Chapter 2: Operating Procedures

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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.

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