Welch Allyn 9020 User manual

Thermometry

Service Manual

The CE mark on this product indicates it has been tested to and conforms with the
provisions noted within the 93/42/EEC Medical Device Directive.

European Regulatory Manager, Medical Division
Welch Allyn Ltd., Navan, Co. Meath
Republic of Ireland

©1996 by Welch Allyn, Inc. All rights reserved.
Printed in the U.S.A.
WELCH ALLYN is a registered trademark of Welch Allyn, Inc.

FOR TECHNICAL SUPPORT AND CUSTOMER SERVICE

Welch Allyn, Inc.
7420 Carroll Road
San Diego, CA 92121-2334
[phone]
[phone]

U.S. Patents 265,525; 4,863,211; 4,911,559; 4,993,424, 4,993,438; and 5,018,872; Australia 108527 and 108528;
Belgium 19809 and 19694; Canada 2,001,196-3; 66391 and 66392; Denmark MR 0272 1991 and MR 0273 1991;
Norwegian 68692 and 68.370; Sweden 48,348; 48, 347; Switzerland 117,864 and 117,865; Taiwan R.O.C. New
Invention Pat. No. ND-25315; ND 25316; and 42337; United Kingdom 2001897 and 2001898; West Germany
M 89 07 483.1 and M 89 07 556.0; Additional U.S. and Foreign Patents Issued and Pending.

CONTENTS

INTRODUCTION.................................................................................... 1

Infrared Thermometry..................................................................... 1

Key Benefits ................................................................................... 1

FEATURES ............................................................................................ 2

WALL MOUNT (OPTION)...................................................................... 3

Removing the 9020 from the Wall Mount ....................................... 3

CONTROLS ........................................................................................... 4

DISPLAY INDICATORS......................................................................... 6

OPERATION MODES ............................................................................ 8

PROBE COVERS ................................................................................ 10

OPERATING PROCEDURES .............................................................. 11

Taking Temperatures in Oral, Core, Rectal Modes ...................... 11

Proper Technique ......................................................................... 14

Taking Temperatures in Surface Mode ........................................ 14

Changing Operation Modes.......................................................... 15

Self Test ....................................................................................... 15

MAINTENANCE ................................................................................... 16

Changing the Probe Cover Dispenser .......................................... 16

Cleaning the Probe Sensor Lens .................................................. 17

Method 1: Removing Light Dust........................................... 17

Method 2: Removing Smudges or Excessive Debris ........... 18

Cleaning the Thermometer ........................................................... 19

Changing the Probe Tip................................................................ 20

Replacing the Batteries................................................................. 21

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Welch Allyn 9020 Infrared Tympanic Thermometer

THEFT PROTECTION ......................................................................... 22

OPTIONS & ACCESSORIES .............................................................. 22

TROUBLESHOOTING......................................................................... 23

ERROR CODES .................................................................................. 27

SECURITY CABLE INSTALLATION (OPTION) .................................. 28

WALL MOUNT INSTALLATION (OPTION) ......................................... 29

SPECIFICATIONS ............................................................................... 30

LIMITED WARRANTY ......................................................................... 31

ii

9020 Users’ Manual

INTRODUCTION

The Welch Allyn™ Model 9020 tympanic thermometer incorporates
infrared optics with advanced microelectronics to quickly and efficiently
register tympanic membrane-derived temperatures.

INFRARED THERMOMETRY

All matter emits thermally-generated electromagnetic waves. As the
temperature of an object increases, it increased radiates infrared energy
(heat rays) at amplitudes and wavelengths corresponding to its tempera­ture.

The infrared sensing system of the 9020, co-developed with NASA’s Jet
Propulsion Laboratory, employs state-of-the art technology to measure
infrared radiation within the ear canal. The thermometer calculates the
patient’s temperature from the highest level of infrared energy detected.

Clinical studies indicate that the temperature of the tympanic membrane
correlates well with core body temperature.

KEY BENEFITS

The ergonomically-designed 9020 offers the most noninvasive approach
to determine body temperature.

Tympanic site measurements enhance patient comfort and avoid
contact with mucous membranes, substantially minimizing the risk of
cross-contamination.

In addition, tympanic temperatures are not affected by patient-specific
variables such as respiration, eating, drinking, and smoking.

The 9020 is ideal for intubated patients and others who cannot have their
temperatures taken orally.

NOTE: This manual provides important instructions. Be sure to
read the “Operating Procedures” section carefully. We recommend
that you practice taking a temperature to familiarize yourself with
the 9020 and develop the proper technique to ensure safe, quick,
and accurate temperatures.

1

Welch Allyn 9020 Infrared Tympanic Thermometer

FEATURES

• Approximately 1-second scan

time to register body
temperature

• Patented, fully-enclosed

probe cover dispenser holds
100 disposable probe covers

• Automated placement of probe

covers to maintain cleanliness

• Retractable probe tip protects

sensor when thermometer not
in use

• Probe cannot be extended

when probe cover dispenser
is empty or missing

• Choice of operating modes

includes oral, core, and rectal
equivalency

• Surface operating mode scans

skin surface temperatures

• One-touch Fahrenheit – Celsius

selector switch

• Simple, 1–2–3 step operation

• Convenient and lightweight

one-piece design

• Large, LCD display shows

temperature, mode,
and other status indicators.

• Visual and audible pulse/

respiration timer

• Memory recall displays last

temperature taken

• Thermometer continuously and

automatically self-calibrates
before every use

• Optional wall mount allows the

thermometer to be locked into
place.

• Field calibration can be

performed in minutes with the
Welch Allyn 9600 Calibration
Tester

2

WALL MOUNT (OPTION)

9020 Users’ Manual

REMOVING THE 9020 FROM THE WALL MOUNT

Lift the 9020 out of the wall mount
while holding the release key to
the right (as shown here). This
release key temporarily disen­gages the wall mount’s spring
latch mechanism and allows the
thermometer to be removed.

RELEASE KEY

3

Welch Allyn 9020 Infrared Tympanic Thermometer

CONTROLS

SLIDE

Moves forward to extend the probe, automatically
applying a probe cover. Moves backward to retract
the probe, automatically removing the probe cover.
Once the probe is partially advanced or partially
retracted, you cannot reverse the direction of the
slide.

The slide will not move unless a probe
cover dispenser containing probe covers is in
place.

PROBE
COVER
DISPENSER
WINDOW

Vertical window in
the handle of the
9020 allows you to
check the supply
of probe covers
remaining in the
dispenser.

BATTERY
COMPARTMENT

Approximately 1 year of
operation (depending on
usage) from each set of
4 AAA batteries. Visual
and audible signals
indicate when batteries
are low.

RECALL

BUTTON

When pressed, the

last temperature taken

will appear on the

display for 5 seconds.

Moving the slide forward

erases the previous

temperature from the

thermometer's memory.

MODE SWITCH

Cycles through Oral,

Rectal, Core, and

Surface to select the

operation mode.

Temperatures must

be taken in the mode

desired; they will

not be converted

between modes.

4

9020 Users’ Manual

LCD DISPLAY

Display provides
readout of
temperature,
status, operation
mode, and error
conditions.
Ergonomically
designed for visual
access as you hold
the thermometer.

PULSE TIMER
BUTTON

Pressing this
button activates a
30-second visual
and audible timer to
measure respiration
and/or pulse.

°F/°C SWITCH

Toggles the thermometric
scale between Fahrenheit
and Celsius, at any time.
When this button is pressed,
the currently displayed
temperature will be con­verted, and redisplayed.

PROBE

When inserted into the ear,

the infrared sensor in the

probe scans thermal energy

radiated within the ear canal.

SCAN

BUTTON

After inserting

the probe into the

ear canal, press this

button to take a

temperature. The

infrared sensor then

measures tympanic

temperatures, and

after 1 second with

no increase in

temperature, the

highest of these

temperatures is

displayed.

5

Welch Allyn 9020 Infrared Tympanic Thermometer

DISPLAY INDICATORS

30-SECOND PULSE TIMER

Press the PULSE TIMER button to check pulse
or respiration. The first of six 5-second segments
blinks once per second for five seconds, and
then remains steady. The other segments
continue the countdown pattern until 30 seconds
has elapsed. The 9020 beeps when the timer is
first activated, after 15 seconds, and again after
30 seconds.

FAHRENHEIT/CELSIUS

This indicator shows the current thermometric
scale, Fahrenheit (F) or Celsius (C). Press the
°F/°C switch to toggle between these scales,
and the currently displayed temperature is
automatically converted.

LOW BATTERY

This symbol appears when the thermometer’s
microprocessor detects a low battery condition.
Once the Battery symbol is displayed, the 9020
will not function until the batteries have been
replaced.

THERMOMETER READY

The Ready symbol (a thermometer in a circle)
indicates that the 9020 has completed self­calibration procedures. The thermometer is
ready for use in 2 – 15 seconds between
temperature measurements.

6

RETRACT SLIDE

This symbol appears, along with an audible
double-beep, as a reminder when the probe
has not been fully retracted. After taking a
temperature, always move the slide back to
its original position to protect the probe from
damage and debris.

MALFUNCTION

If the 9020 requires service due to an internal
malfunction, this symbol appears, along with a
numeric error code indicating the nature of the
problem. When this indicator is displayed, no
temperatures can be taken.

UNDER/OVER TEMPERATURE
RANGE INDICATORS

This Up Arrow/Down Arrow symbol blinks for
five seconds, then remains steady if the 9020
detects a temperature that is beyond the normal
operating range (75.0°F – 108.0°F). The Down
Arrow indicates a temperature below 75°F. The
Up Arrow indicates a temperature above 108°F.

9020 Users’ Manual

7

Welch Allyn 9020 Infrared Tympanic Thermometer

OPERATION MODES

The 9020 measures, converts, and displays temperatures in the
following modes:

• Oral

• Core

• Rectal

• Surface

The oral, core, and rectal modes display tympanic temperatures that
have been converted to reflect the corresponding temperature of the
traditional oral, core, or rectal sites.

Conversion factors used by the 9020 are derived from statistical mean
values obtained through comparisons of tympanic membrane-derived
temperatures with corresponding oral, core, and rectal temperatures.

The surface mode shows the actual, unadjusted radiated temperatures
measured during a scan (up to 30 seconds of continuous scan time).

To change operation modes, see the “Operating Procedures” section of
this manual.

The current operation mode of the 9020 appears in the top, right corner
of the thermometer’s display:

ORAL MODE

This mode converts the tympanic temperature to
display its “oral equivalent.” Use this mode
where glass or electronic oral thermometers are
now used. The normal range of oral temperature
is 97.6°F to 99.6°F (36.5°C to 37.5°C).

8

CORE MODE

This mode converts the tympanic temperature to
display its “core equivalent.” Use this mode in
areas where esophageal or pulmonary artery
temperatures are now used. The normal range
of core temperature is 98.2°F to 100.2°F
(36.8°C to 37.9°C).

RECTAL MODE

This mode converts the tympanic temperature to
display its “rectal equivalent.” Use this mode
where glass or electronic rectal thermometers
are now used. The normal range of rectal
temperature is 98.6°F to 100.6°F
(37.0°C to 38.1°C).

SURFACE MODE

This mode measures the temperatures of
different surface areas. Pressing the SCAN
button activates the infrared sensor and displays
the continuous radiated temperatures. The
thermometer shows the last temperature read
when the SCAN button is released, or when 30
seconds has elapsed (a double beep sounds).

9020 Users’ Manual

TEST MODE (NOT AN OPERATION MODE)

This mode displays an unadjusted temperature.
The test mode is used exclusively to test or
calibrate the 9020 thermometer using the
WELCH ALLYN‚ 9600 Calibration Tester.
Please note that this function is accessed by a
special procedure described in the 9600
Operation Manual.

9

Welch Allyn 9020 Infrared Tympanic Thermometer

PROBE COVERS

A dispenser of 100 disposable probe covers fits conveniently into the
thermometer’s handle. This one-piece design minimizes handling to
protect both the patient and the probe covers from environmental con­taminants. The 9020 will not operate unless a probe cover is in place.

NOTE: Use

9020. The design and thermal properties of these probe covers
ensure the most efficient measurement of tympanic temperature.

As you advance the slide to extend the probe, a cover is automatically
positioned over the tip of the probe. The slide
probe cover dispenser containing probe covers is in place.

When you retract the probe, the probe cover is ejected automatically. To
avoid cross-contamination, probe covers cannot be reused.

Note that once the probe is partially advanced or partially retracted, you
cannot reverse the direction of the slide.

only

WELCH ALLYN Model 050 probe covers with the

will not move

Ultra-thin, heat-energy transparent film
stretches evenly over the entire probe tip.

Probe covers are attached to one another
within the probe cover dispenser; as one
cover is used, the next one advances into
place, ready for the next temperature.

unless a

WARNING: A damaged probe cover could affect the accuracy of
a temperature reading. If a probe cover is torn, retract the probe,
wait for the Ready symbol, then advance the slide again to apply
a new probe cover.

10

9020 Users’ Manual

OPERATING PROCEDURES

TAKING TEMPERATURES IN ORAL, CORE, RECTAL
MODES

1

Slowly move slide forward to extend probe,
automatically applying probe cover.

Look for the Ready symbol
on the display before you
advance the slide. This can
take from 2–15 seconds,
depending on when the last
temperature was taken.

Make sure that the tem­perature scale (°F, °C)
and the operation mode
(Oral, Core, Rectal) are
those that you want to use
to take the temperature.

READY
SYMBOL

Check the condition of the patient’s ear. The 9020 should not
be used if any discharge is present in or around the ear.

After extending the probe, inspect the probe cover. If it is
damaged or misaligned, return the slide to its original position
to discard the probe cover. Wait for the Ready symbol, then
extend the probe again.

Take the temperature within 30 seconds after extending the
probe. If the probe remains extended for more than 30 sec­onds, you will hear a double-beep every 5 seconds for 5
minutes or until you retract the probe. The 9020 will then
recalibrate automatically and be ready for use in a few
seconds.

11

Welch Allyn 9020 Infrared Tympanic Thermometer

Insert probe snugly into ear, completely closing

2

off ear canal. Position probe towards patient’s
opposite temple, press SCAN button, and wait
for beep.

For optimum control,
obtain a temperature in the
patient’s right ear if you are
right-handed. Use the
patient’s left ear if you
are left-handed.

After approximately
1 second, a single beep
will sound to indicate that
the temperature has been
taken.

12

NOTE: Please be sure to read the next section, “Proper
Technique,” for important information about the tech­nique required to obtain accurate temperatures.

3

9020 Users’ Manual

Remove probe from ear. Retract slide, automati­cally removing probe cover. Read and record
temperature.

After the beep, indicating
that the temperature has
been taken, withdraw the
probe from the patient’s
ear.

Removing the probe prior
to the beep may result in a
temperature measurement
that is lower than the
actual temperature.

Hold the 9020 over a
waste container, then
return the slide back to its original position to retract the probe.
As you do, the probe cover is automatically removed. Read
and record the temperature.

The temperature will remain displayed for five minutes, unless
you take another temperature.

Before repeating a temperature measurement using the same
ear of the patient, wait 2 minutes to allow tympanic tempera­tures to stabilize, or use the opposite ear. Note that slight, but
insignificant, differences in temperature often exist between the
right ear and the left ear.

13

Welch Allyn 9020 Infrared Tympanic Thermometer

PROPER TECHNIQUE

Obtaining correct temperature measurements with the 9020, as with any
thermometer, requires the proper technique.

There is a temperature
gradient within the ear canal
that causes variations in
temperature of up to 5°F,
as shown in this diagram.

Temperatures are lowest at
the external opening of the
ear canal due to ambient air
temperature.

The highest temperatures
occur at the deepest portion
of the ear canal, at or around
the tympanic membrane.

Measuring the tympanic membrane provides the most accurate tempera­ture. However, the 9020’s infrared sensor will register only the tympanic
temperatures that it can “see” during a temperature measurement.

In some patients, anatomical characteristics of the ear canal may obstruct
the sensor’s view of the tympanic membrane.

You should optimize the sensor’s field of view by consistently:

• Positioning the probe snugly to close off the ear canal

• Directing the probe toward the opposite temple.

TAKING TEMPERATURES IN SURFACE MODE

Follow these steps to measure skin surface temperatures with the 9020:

• Make sure that the Ready symbol is displayed, and that the

thermometer is in the surface (S) operation mode. For informa­tion, see the “Operation Modes” and “Changing Operation Modes”
sections of this manual.

14

9020 Users’ Manual

• Advance the slide to extend the probe tip, automatically applying

a probe cover.

• Hold the probe approximately 1/4" above the skin surface, and

position the sensor lens to “see” the area to be scanned.

• Press and

readings appear on the display approximately four times a
second for up to 30 seconds. After 30 seconds, a double beep
sounds, and the

• Release the SCAN button. Slowly retract the slide to its original

position, automatically removing the probe cover. Return the
9020 to the wall mount.

hold

the SCAN button. Updated temperature

last

surface temperature read is displayed.

CHANGING OPERATION MODES

You can change the operating mode of the 9020 at any time to measure
and display oral (O), core (C), rectal (R), or surface (S) temperatures.
For more information, see the “Operation Modes” section of this manual.

• Insert a pointed object, such as a paper clip, through the small

hole in the Mode button.

• Press in and hold the mode switch to cycle through the operation

modes. When the desired mode appears in the upper, right
corner of the display, release the Mode switch.

NOTE: Temperatures cannot be converted between modes. If you take
a temperature, then change the operation mode, pressing the RECALL
button will display that temperature in the previous mode.

SELF TEST

All segments of the display (LCD) are turned on for 1/2 second while the
probe is being moved out of the thermometer case; this is to permit the
verification of proper display operation.

The thermometer performs an internal self test continually while the unit
is self calibrating. The results are displayed as a “Test Temperature”

98.6°F (37°C) nominal, for 1/2 second following the display test. The
“Test Temperature” is also compared against internal limits, If the limit
test fails, a malfunction is displayed.

15

Welch Allyn 9020 Infrared Tympanic Thermometer

MAINTENANCE

CHANGING THE PROBE COVER DISPENSER

A vertical window in the handle of
the 9020 allows you to see when
the probe cover dispenser is
empty. To replace the dispenser:

1. Ensure that the probe is
retracted, then remove the
probe cover dispenser from
the thermometer’s handle by
pulling on the tab at the end
of the dispenser (Figure A).
Discard the empty dispenser.

2. Check to see that the first
probe cover in the new
dispenser is positioned
properly (Figure A).

Figure B

16

Figure A

3. Insert the new probe cover
dispenser (flat end first) into the
handle of the thermometer. Align
the edges of the dispenser with
the slots inside of the handle, then
slide the dispenser upward until
it snaps into place (Figure B).
The 9020 is now ready for use.

You should routinely take a
moment to inspect the sensor lens
for clarity, and clean as needed.
Refer to “Cleaning the Probe
Sensor Lens” on the next page.

9020 Users’ Manual

CLEANING THE PROBE SENSOR LENS

Dust and other minute particles of environmental debris can build up on
the probe sensor lens during normal use of the 9020.

The probe sensor lens should always be shiny and clear. Inspect the
lens frequently and clean as necessary. The lens should also be cleaned
as routine maintenance according to the two cleaning methods below.

NOTE: A dirty lens will affect the accuracy of temperature readings.

METHOD 1: REMOVING LIGHT DUST

(RECOMMENDED DAILY)

1. Advance the slide to extend the probe tip.

2. Leave the probe cover in place. Using a dry cotton swab, gently press
the probe cover against the sensor lens (Figure C). Loose debris on
the lens will adhere to the probe cover.

Figure C

3. Move the slide back to its original position to remove the probe cover
and retract the probe tip. The 9020 is now ready for use.

17

Welch Allyn 9020 Infrared Tympanic Thermometer

METHOD 2: REMOVING SMUDGES OR EXCESSIVE DEBRIS

(RECOMMENDED AS NEEDED OR IF LOW TEMPERATURE
READINGS PERSIST AFTER METHOD #1)

MATERIALS NEEDED • Isopropyl Alcohol

• Cotton Swab

1. Advance the slide to extend the probe tip.

2. Manually remove the probe cover to expose the probe sensor lens.

3. Using a cotton swab slightly moistened with isopropyl alcohol, gently
wipe the surface of the lens to remove debris (Figure D).

4. Wipe the lens with a dry cotton swab to absorb moisture and pick up
any remaining debris (Figure D).

5. Move the slide back to its original position to retract the probe tip.

6. Allow 30 minutes before using the thermometer.

18

Figure D

9020 Users’ Manual

CLEANING THE THERMOMETER

Clean the exterior of both the 9020 and the optional wall mount as
needed. Wipe all surfaces with a clean cloth, dampened with warm water
and a mild detergent or germicidal cleaner (see the table below for
acceptable cleaning agents).

• As some solutions may stain, try a small test area first.

• Make sure that the cloth is damp, but

not

wet.

• Do not allow cleaning solution to run inside of the thermometer.

• Never immerse the thermometer in the cleaning solution.

CLEANING AGENT LENS THERMOMETER WALL MOUNT

Ammonium ✔✔
Bleach (50%) ✔✔
Sproricidin® ✔✔
MetriSpray™ ✔✔
Cidex ✔✔
Detergent (mild) ✔✔
Isopropyl Alcohol ✔✔ ✔
Lysol ✔✔

Refer to the

Technical Manual

Sporicidin is a registered trademark of Sporicidin International [phone]. MetriSpray is a trademark
of Metrex Research Corporation [phone].

WELCH ALLYN 9020 Infrared Tympanic Thermometer

for the procedure to sterilize the thermometer.

19

Welch Allyn 9020 Infrared Tympanic Thermometer

CHANGING THE PROBE TIP

A damaged probe tip can tear the ultra-thin film in the probe covers. A
temperature taken with a torn probe cover may result in a measurement
that is higher than the actual temperature.

Periodically inspect the plastic probe tip for nicks or other damage, and
replace if necessary.

MATERIALS NEEDED • Probe Tip Replacement Kit

(Part #20688-000)

1. Advance the slide to extend the probe tip.

2. Manually remove the probe cover to expose the probe tip.

3. Remove the probe tip by turning it counterclockwise (Figure E).
Discard the damaged probe tip.

4. Install the new probe tip by turning it clockwise, then hand-tightening
(5 inch-lbs.) until it is positioned snugly against the base of the probe.
Do not over-tighten the tip.

5. As a precaution, clean the sensor lens to remove any dust or debris
that may have adhered to the exposed lens during replacement of the
probe tip.

Follow the steps for “Cleaning the Probe Sensor Lens – Method 2”
described earlier in this section of the manual.

Figure E

20

9020 Users’ Manual

REPLACING THE BATTERIES

Under normal use, a set of batteries will provide power to the 9020 for
about 1 year, depending on usage. When battery power becomes low, a
Battery symbol appears on the display and the thermometer cannot be
used until they are replaced.

1. Remove the screw that secures the battery compartment door, then
press the release notch to remove the door (see Figure F).

2. Remove the four depleted batteries and dispose of properly.

3. Press SCAN button to reset the thermometer.

4. Install four new AAA size Alkaline batteries in the
position as shown in the diagram inside of the battery compartment.

The 9020 will automatically perform a diagnostic self-test of the
electronics (indicated by a segment cycling through the display).
If not, reinstall the batteries to ensure correct positioning.

exact

order and

Figure F

5. Replace the battery compartment door, then reinstall the screw to
secure the door (Figure F).

21

Welch Allyn 9020 Infrared Tympanic Thermometer

THEFT PROTECTION

The optional wall mount serves as a base for the thermometer when it is
not in use. You can lock the 9020 into the wall mount by rotating the
release key 90° to the right. Once in this position, the key can be re­moved by pulling downward.

An optional security cable (20796-000) may be added to your thermom­eter and wall mount for single area use.

OPTIONS & ACCESSORIES

WELCH ALLYN 050 Probe Covers

WELCH ALLYN Part #05051
Box of 2 dispensers (100 probe covers/dispenser)
Packaged in quantities of 5,000 probe covers/carton

Probe Tip Replacement Kit

WELCH ALLYN Part #20688-000
12 replacement probe tips

Security Cable

WELCH ALLYN Part #20796-000
Lanyard cable attaches 9020 to wall mount for added security

WELCH ALLYN 9020 Wall Mount

WELCH ALLYN Part #20757-400
Additional or replacement wall mount for the 9020

Portable Stand

WELCH ALLYN Part #08071-000
Rolling stand provides additional security without sacrificing mobility

WELCH ALLYN 9600 Calibration Tester

WELCH ALLYN Part #01800-210
Temperature reference for calibration of WELCH ALLYN
thermometers (both infrared and thermistor types)

22

TROUBLESHOOTING

9020 Users’ Manual

PROBLEM

Slide Will Not
Move

High
Temperatures

SOLUTION

Probe cover dispenser missing or empty. Check
position of dispenser in thermometer’s handle. If
empty, install new dispenser.

Probe covers positioned improperly within probe
cover dispenser. Remove dispenser from ther­mometer handle. Pull on first probe cover to remove
any misaligned or bent covers. Re-position first
probe cover to extend 1/8" beyond top of dispenser,
then reinstall dispenser to thermometer handle. If
problem persists, replace probe cover dispenser.

Probe tip not installed securely and may be lodged
against reference arm (shields lens when probe
retracted). Looking into front of 9020, press down on
reference arm while moving slide forward. Hand
tighten tip (clockwise) until snug against base of
probe, then retract probe.

Check current operation mode of the 9020. Core
and rectal modes obtain higher temperatures than
oral mode (test mode is used for calibration only).

Detected warmer temperature prior to inserting probe
into ear, or heat source (such as a heat lamp) nearby
when taking temperature. Insert probe into ear, wait
1 second, then press SCAN button.

Check integrity of probe cover prior to taking tem­perature. Damaged (or missing) probe cover can
result in temperature reading up to 1.5°F higher than
actual temperature.

23

Welch Allyn 9020 Infrared Tympanic Thermometer

PROBLEM

Low
Temperatures

Inconsistent
Results of
Repeated
Temperatures

SOLUTION

Improper technique. Insert probe snugly into ear,
completely closing off ear canal.

If ear canal is curved significantly, sensor’s view of
the tympanic membrane may be obstructed. Gently
pull up and back on external ear to straighten ear
canal before inserting probe.

Debris on probe sensor lens. Clean lens. See “Main­tenance” section of this manual for procedure.

Probe tip not installed securely; hand tighten tip
(clockwise) until snug against base of probe. See
“Maintenance” section of this manual for procedure.

Check current operation mode of the 9020. Oral
mode obtains lower temperatures than core and
rectal modes (test mode is used for calibration only).

Not enough time elapsed since last temperature
taken (same ear). Insertion of probe results in slight
“draw down” of ear canal temperature. Wait 2 min­utes to allow temperature to stabilize between re­peated temperature measurements in the same ear,
or use patient’s opposite ear.

24

Improper scanning technique. Insert probe snugly
into ear, completely closing off ear canal.

If ear canal is curved significantly, sensor’s view of
the tympanic membrane may be obstructed. Gently
pull up and back on external ear to straighten ear
canal before inserting probe.

9020 Users’ Manual

PROBLEM

Improper
Delivery of
Probe Cover

or
Probe Cover

Positioned
Incorrectly
on Probe

SOLUTION

Probe covers positioned improperly within probe
cover dispenser. Remove dispenser from ther­mometer handle. Pull on first probe cover to remove
any misaligned or bent covers. Re-position first
probe cover to extend 1/8" beyond top of dispenser,
then reinstall dispenser to thermometer handle. If
problem persists, replace probe cover dispenser.

Obstruction between probe and probe cover dis­penser. Remove dispenser, inspect thermometer
handle and remove debris, if any. Ensure probe
covers are properly positioned in probe cover dis­penser, then reinsert dispenser into handle.

Probe tip is damaged. Replace with new probe tip.
See “Maintenance” section of this manual for proce­dure.

Damaged probe covers. Replace probe cover dis­penser.

Probe Cover
Breakage

Probe tip is damaged. Replace with new probe tip.
See “Maintenance” section of this manual for proce­dure.

Probe covers positioned improperly within probe
cover dispenser. Remove dispenser from ther­mometer handle. Pull on first probe cover to remove
any misaligned or bent covers. Re-position first
probe cover to extend 1/8" beyond top of dispenser,
then reinstall dispenser to thermometer handle. If
problem persists, replace probe cover dispenser.

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Welch Allyn 9020 Infrared Tympanic Thermometer

PROBLEM

Continuous,
Intermittent
Audible Tone

Blank LCD
Display, No
Temperature
on Display

Unable to
Remove
9020 from
Wall Mount

SOLUTION

Probe is partially extended. Ensure slide is fully
retracted.

Improper operating condition. Check display for
error status. See “Error Codes” section of this manual
for explanation.

Probe extended for over 5 minutes. Retract probe.

Battery power depleted. Replace batteries. See
“Maintenance” section of this manual for procedure.

Wall mount’s spring latch mechanism is engaged.
Hold release key (underside of wall mount) to the
right while removing thermometer.

Release key for spring latch mechanism (underside
of wall mount) is missing or locked. Insert key into
mechanism, then rotate key clockwise until tab is
perpendicular to front panel of wall mount. Hold
release key to the right while removing thermometer.

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9020 Users’ Manual

ERROR CODES

When the 9020 detects an improper operating condition, the malfunction
symbol (X) will appear with one of the numeric error codes (Er) below.

Set the thermometer aside for one hour to allow
the electronics to stabilize to room temperature.

• If the 9020 is faulty, the error status will

remain to indicate that the thermometer
needs service.

• If the condition is transient in nature, the

error status will disappear. The 9020 will
then self-calibrate, and be ready for use.

ERROR EXPLANATION

Er2 The ambient temperature is beyond the operating

range of 60°F – 104°F. Allow the thermometer to
stabilize at normal room temperature before use.

Er4 The infrared sensing system may be detecting a

nearby temperature source that is greater than
110°F. If not, the thermometer requires service.

Er5 The ambient temperature is above 110°F.
Er6 If not, the thermometer requires service.

Er0 Internal error. The thermometer requires service.
Er1
Er3
Er7
Er8
Er9

27

Welch Allyn 9020 Infrared Tympanic Thermometer

SECURITY CABLE INSTALLATION (OPTION)

For added security, an optional Security Cable may be installed that will
connect the thermometer to the wall mount.

MATERIALS NEEDED • Security Cable (Part #20796-000)

• Flat-Blade and Phillips Screwdrivers

1. Insert screwdriver into the wall mount to release the clip.

2. Insert one end of the security cable through the slot of the clip, then
reinsert the clip into the wall mount.

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9020 Users’ Manual

3. Remove the screw from the battery door. Spread the case of the
thermometer just wide enough to insert the other end of the security
cable. Close the battery door and reinstall the screw.

WALL MOUNT INSTALLATION

The following guidelines are provided to ensure proper placement and
installation of your thermometer wall mount.

The top of the wall mount should be located about 60 inches from the floor.
You will need at least a 4 inch clearance from the bottom and sides of the
wall mount and 12 inches from the top.

Wall Mount Requires Three

Pan or Round Head Screws (Your Choice of #6, #8, or #10)

Wall Surface Fastener
Dry wall E-Z Twist in anchor (Molly or toggle)*

Concrete/masonry Expanding anchors
Wood Wood screws

*Available from Welch Allyn in quantities of 100, part number 20938-000

29

Welch Allyn 9020 Infrared Tympanic Thermometer

SPECIFICATIONS

Thermometer Type:........................................................................... Infrared

Measurement Range:................................ 23.9°C to 42.2°C (75°F to 108°F)

Measurement Calibration Accuracy: ......................... + 0.1°C at 37°C - 39°C

+0.2°F at 98°F - 102°F

Other ranges meet ASTM Specification #E 1112 Table 1

Operating Environment: ............................ 15.6°C to 40.0°C (60°F to 104°F)

70% relative humidity

Storage Environment: ...................................-55°C to 65°C (-67°F to 149°F)

70% relative humidity

Case Dimensions: ........................................... 15.38cm x 15.38cm x 5.12cm

(6in x 6in x 2in)

Weight (including batteries and probe covers):...................... 258 gr (9.1 oz)

Case Material: .............................................................................ABS Plastic

Power Source: ................................................................... AAA batteries (4)

Battery Life: ................................................................. Approximately 1 Year

Display Type: .............................................................. Liquid Crystal Display

30

9020 Users’ Manual

LIMITED WARRANTY

WELCH ALLYN LIMITED WARRANTY:NEW UNITS–1 YEAR

REFURBISHED UNITS–1 YEAR

Welch Allyn, Inc. (“Welch Allyn”) warrants that each new Welch Allyn Model 9020
Thermometer (the “Product”) is free from defects in material and workmanship under
normal use and service for a period of one year for new units or 1 year for refurbished from
the date of shipment from Welch Allyn. This Warranty shall be fulfilled by the repair or
replacement by Welch Allyn or its authorized representative, at Welch Allyn’s discretion of
any such defect, free of charge for parts and labor.

EXCLUSIONS FROM WARRANTY

This Welch Allyn Warranty shall be void, and Welch Allyn will not be responsible for any
loss associated with, any of the following: (i) probe tips damaged or defective after
delivery to Customer, (ii) not providing routine maintenance and calibration, (iii) missing,
damaged, or discharged batteries after the first year, (iv) any product that (a) has had the
serial number defaced, (b) has been repaired by anyone other than Welch Allyn or an
authorized Welch Allyn service representative (c) has been altered or (d) has been used
in any manner other than in accordance with instructions or shows evidence of abusive
handling.

WARRANTY CLAIMS

If a Product requires service during the applicable warranty period, the Customer should
immediately return the Product at Customer’s own expense to Welch Allyn, 7420 Carroll
Road, San Diego, CA 92121. Any risk of loss or damage in shipment of the Product to
Welch Allyn shall be borne exclusively by Customer. Repair or replacement will be made
at Welch Allyn’s expense subject to the terms of this Warranty. Product repaired under
warranty provisions will be returned to Customer at Welch Allyn's expense. Any damage
in shipment from Welch Allyn is the responsibility of the delivery carrier.

LIMITATIONS

In no event shall Welch Allyn be liable for any incidental, indirect, or consequential
damages in connection with the purchase or use of any Product.

This Warranty is in lieu of other obligations or liabilities on Welch Allyn’s part, and Welch
Allyn neither assumes, nor authorizes, any representative or other person to assume for
it any other liability in connection with the sale of the Product.

THIS WARRANTY IS EXCLUSIVE AND IN LIEU OF ANY IMPLIED WARRANTY
OF MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSE, OR OTHER WAR­RANTY OF QUALITY, WHETHER EXPRESS OR IMPLIED, WELCH ALLYN WILL NOT
BE LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES.

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