Respironics 950 Troubleshooting guide

English
Instruction and Service Manual
Model 950
Finger Pulse Oximeter
0459

iii
English
About the Manual
Shaded boxes draw attention to contraindications, warnings, cautions
and notes.
The boxed messages are important. Be sure to read them.
The information in this manual has been carefully checked and is
believed to be accurate. In the interest of continued product
development, RESPIRONICS, INC. reserves the right to make
changes and improvements in this manual and the products it
describes at any time, without notice or obligation.
Caution: Federal Law (USA) restricts this device to sale by or on the
order of a physician.
Respironics Georgia
175 Chastain Meadows Court
Kennesaw, Georgia 30144-3724
USA
Telephone: [phone]
Fax: [phone]
Customer Service Telephone: [phone] (USA and Canada)
Customer Service Fax: [phone] (USA and Canada)
www.respironics.com
Respironics Deutschland
Gewerbestrasse 17
82211 Herrsching
Germany
Telephone: [phone]
Fax: [phone]
Respironics Asia Pacific
3/F, Microtron Building
38 Hung To Road
Kwun Tong, Kowloon, Hong Kong
Telephone: [phone]
Fax: [phone]
is a registered trademark of Respironics, Inc.
Copyright © 2002 Respironics, Inc. All rights reserved.

v
English
Table of Contents
Contraindications, Warnings, and Cautions ........................ 1
Introduction ............................................................................. 3
Description................................................................................... 3
The 950 at a Glance ..................................................................... 4
Intended Use ................................................................................ 6
Operating Instructions............................................................ 7
Getting Started ............................................................................. 7
Lanyard and Lanyard Lock.......................................................... 8
Battery Requirements .................................................................. 9
Inserting New Batteries.............................................................. 10
Activating the 950...................................................................... 11
Verifying Operation................................................................... 12
Conditions That May Affect Use ............................................... 13
Maintenance........................................................................... 14
Storage Requirements ................................................................ 14
Theory of Operation ............................................................. 16
Oximetry .................................................................................... 16
950 Averaging............................................................................ 18
Specifications ......................................................................... 19
Parts and Accessories............................................................ 20
Parts ........................................................................................... 20
Accessories ................................................................................ 20
Technical Support ...................................................................... 20
Warranty................................................................................ 21
Troubleshooting Guide ......................................................... 22

vi
Figures
Figure 1. Top digital display illustration and bottom label. .... 4
Figure 2. Lanyard and lock. .................................................... 8
Figure 3. Inserting new batteries........................................... 10
Figure 4. Applying the 950................................................... 11
Figure 5. Maintenance choices.............................................. 15
Glossary of Symbols
SYMBOL DEFINITION OF SYMBOL
Attention, Consult ACCOMPANYING
DOCUMENTS
Type BF Applied Part:
(Patient isolation from electrical shock).
Canadian Standards Association
NRTL/C Meets both Canadian and United States
Standards.
0459
CE Marking indicating conformance to EC
directive No. 93/42/EEC concerning medical
devices.
Not for Continuous Monitoring
(No Alarm for SpO2)

1
English
Contraindications, Warnings, and Cautions
CONTRAINDICATIONS:
Do not use the 950 in an MRI environment.
Do not operate the 950 in an explosive atmosphere.
Do not use the 950 on infant or neonatal patients.
WARNINGS:
Batteries may leak or explode if used or disposed of improperly.
CAUTIONS:
Federal Law (USA) restricts this device to sale by or on the order
of a physician.
Read this entire manual carefully before using the Respironics 950
Pulse Oximeter.
The 950 determines the percentage of arterial oxygen saturation of
functional hemoglobin. Significant levels of dysfunctional
hemoglobin such as carboxyhemoglobin or methemoglobin may
affect the accuracy of the measurement.
Cardiogreen and other intravascular dyes, depending on the
concentration, may affect SpO2accuracy.
The 950 must be able to measure the pulse properly to obtain
accurate SpO2measurement. Verify that nothing is hindering the
pulse measurement before relying on the SpO2measurement.
Some situations that may contribute to erroneous pulse
measurement are:
•inadequate perfusion,
•excessive patient movement,
•pulse oximeter and blood pressure measurement on the
same limb, etc.
The 950 may interpret motion artifact of sufficient amplitude and
regularity as good perfusion (green).
Do not use the 950 in situations where alarms are required. The
950 has no audible alarms.
The 950 is intended for spot-checking or continuous monitoring by
an attending health care professional. Because the 950 has no
audible alarms, international labeling requirements (ISO 9919)
dictate it be labeled, “Not for continuous monitoring”.

2
CAUTIONS:(Continued)
Check application site periodically (at least every thirty minutes) to
determine circulation, positioning and skin sensitivity.
The 950 may not work for all patients. If you are unable to achieve
stable readings, discontinue use.
Finger nail polish may reduce light transmission and thereby affect
SpO2accuracy.
A flexible circuit connects the two halves of the 950. Do not twist or
pull on the connection.
Do not use different types of batteries at the same time. Do not mix
fully charged and partially charged cells at the same time. These
actions may cause the batteries to leak.
Batteries must be removed if the 950 is going to be stored for more
than one month or batteries may leak.
Do not immerse the 950 in liquid to clean.

3
English
Introduction
Description
Respironics, Inc. has integrated the finger clip sensor and the
electronics of the Respironics Model 920 hand held Pulse Oximeter
into one unit, the Model 950. The 950 is very small (1.3 inch W x 1.3
inch H x 2.2 inch L) and lightweight (2 ounces).
The 950 displays numerical values for functional arterial hemoglobin
oxygen saturation (%SpO2) in percentage and pulse rate ( ) in
beats per minute on light emitting diode (LED) digital displays.
With each detected pulse, the Perfusion Display blinks. Patient
perfusion signals are graded as good, marginal or inadequate and are
indicated as such by the perfusion indicator changing color from green
to yellow or red respectively. This sophisticated, yet simple technique
provides a pulse-by-pulse visual indication of waveform signal
quality, without requiring the user to perform complex signal analysis
during critical patient care situations.
Two AAA battery cells power the 950 and operate it for
approximately 1,600 spot checksaor 18 hours of continuous operation
between battery replacement. When the batteries are low, the digital
displays will blink once per second. (Refer to page 9 for battery
specifications and page 10 for battery replacement instructions.)
aCalculated at 40 seconds per spot check using two AAA alkaline battery
cells.

4
The 950 at a Glance
Figure 1. Top digital display illustration and bottom label.
%SpO2Display
Heart Rate Display
Perfusion Display
Finger Grip
Battery
Polarity
Markings
Serial
N
umbe
r

5
English
•%SpO2Display
Numeric LEDs display the value of percent oxygen saturation,
calculated using a four beat exponential averaging technique.
(Refer to page 16, Theory of Operation, for information on
averaging.)
•Heart Rate Display
Numeric LEDs display the pulse rate in beats per minute,
calculated by an eight beat sliding averaging technique. (Refer
to page 18 for information on averaging.)
•Perfusion Display
Provides a visual indication of the signal quality, while
blinking at the corresponding pulse rate. It is a method of
alerting the user to changes in the pulse waveform signal that
may affect the SpO2data.
Green = good signal amplitude
Yellow = artifact or marginal signal amplitude
Red = inadequate signal amplitude
CAUTION:
The 950 may interpret motion artifact of sufficient amplitude and
regularity as good perfusion (green).
•Battery Low
Numeric LEDs flash once per second when batteries are low.
Replace the batteries as soon as possible. Refer to page 10,
Inserting New Batteries.
•Finger Removal
A minus (-) sign appears in the left most digit of the %SpO2
display when the 950 senses that the finger has been removed.
The last measured SpO2and pulse rate values freeze for ten
seconds, then the displays go blank.
•The label on the bottom of the 950 lists the model number,
serial number, CAUTION statement, and battery polarity
indicators.

6
Intended Use
The 950 is a portable device for spot-checking or attended-care
monitoring of adult or pediatric patients. Use the 950 with finger
thickness between 0.3 to 1.0 inches. The 950 is not recommended
where motion is expected or for relatively long-term monitoring, e.g.,
greater than 30 minutes.
CONTRAINDICATION:
Do not use the 950 on infant or neonatal patients.
CAUTION:
Do not use the 950 in situations where alarms are required. The
950 has no audible alarms.
CAUTION:
It is intended for spot-checking or continuous monitoring by an
attending health care professional. Because the 950 has no audible
alarms, international labeling requirements (ISO 9919) dictate it be
labeled, “Not for continuous monitoring”.
CAUTION:
Check application site periodically (at least every thirty minutes) to
determine circulation, positioning and skin sensitivity.
CAUTION:
The 950 may not work for all patients. If unable to achieve stable
readings, discontinue use.