Instruction Manual
Single-Input Thermistor
Thermometer
(Model 91428-05)
68X001349 Rev0 0717 1065DGMAN_91428-05
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com
TABLE OF CONTENTS
1. QUICK-START GUIDE ........................... 1
2. INTRODUCTION .................................... 2
3. SAFETY PRECAUTIONS ....................... 3
4. SPECIFICATIONS ................................. 4
5. BATTERY INSTALLATION AND
REPLACEMENT .................................... 5
6. INSERTING AND REMOVING
OPTIONAL RUBBER ARMOR ............... 6
7. ASSEMBLING OPTIONAL HANDS-
FREE ACCESORIES ............................. 7
8. CONNECTING A THERMISTOR............ 8
9. KEY FUNCTIONS .................................. 9
10. DISPLAY OVERVIEW ...........................10
11. MEASUREMENT MODE .......................11
12. SELECTING TEMPERATURE SCALE ..12
13. MIN AND MAX FUNCTION ...................12
14. AUTO OFF FUNCTION .........................13
15. CALIBRATION ......................................13
16. CLEAR FIELD CALIBRATION ...............14
17. FIELD CALIBRATION UNLOCK ............15
18. FIELD CALIBRATION LOCKOUT .........16
19. MAINTENANCE ....................................17
20. CLEANING ............................................17
21. BATTERIES ..........................................17
22. TROUBLESHOOTING ..........................18
23. ACCESSORIES ....................................19
24. WARRANTY .........................................20
25. PRODUCT RETURN .............................20
26. INNOCAL® CALIBRATION AND REPAIR
SERVICES (NORTH AMERICA) ..........21
1. QUICK-START GUIDE
To ensure best results please read the
complete manual.
1. Connect probe.
2. Press the on/off key.
Press again to turn on backlight.
3. Select °C or °F display using °C/°F key.
4. Insert probe in sample.
Allow adequate time for reading to
stabilize.
Response time will vary depending on
probe.
5. Take reading.
Press hold key to freeze display.
Press min/max to display minimum or
maximum temperature.
6. Press and hold the on/off key for three
seconds to turn meter off.
- 1 -
2. INTRODUCTION
Thank you for choosing the
Single-Input Thermistor
Thermometer. This sturdy
handheld thermometer
provides highly accurate
temperature measurements
using thermistor probes. The
instrument is easy to use and
includes the following
features:
• Operator selection of Celsius or Fahrenheit
scale
• Resolution of 0.1° C/F
• Large backlit LCD with two lines of
four-digit display
• Hold feature for temporarily retaining
a reading
• Min and max readings display
•
Field calibration capability
•
Auto power off with Enable/Disable function
• Low-battery warning
• Standard ¼ inch (6.3mm) phone jack
connector input
• Operates with a wide selection of probes
- 2 -
3. SAFETY PRECAUTIONS
WWARNING
Voltages present at the thermistors may
also be present at the battery terminals.
Always disconnect the thermistor when
changing batteries.
This instrument is designed to accept low
level signals supplied by standard 400
series thermistors. Under no
circumstances should the input voltage
exceed the specified 10 v rms.
1. Do not use or store this instrument in
microwave ovens or any abnormally hot or
cold areas.
2. Weak batteries should not be left in the
instrument. Dead batteries can leak and
cause damage to unit.
- 3 -
4. SPECIFICATIONS
Range
–40 to 150°C
(–40.0 to 302.0°F)
Resolution
0.1°C (0.1°F)
Accuracy
±0.2°C (±0.4°F) from
–40 to 125°C (-40 to 257°F)
±0.5°C (±0.9°F) from
125 to 150°C (257 to 302°F)
LCD display
4+4 digit, 58 x 40mm dual-line
display with backlight
Out-of-range
display
“Ur” or “OPEN”
Display update rate
0.5 sec per update
Input
One probe with ¼ inch (6.3mm)
phone jack connector
Input protection
10 v rms
Battery
Three AA, 1.5V alkaline
Battery life
700 hours continuous, typical
Auto shutoff
17 minutes after last key press
Stability criteria
“STABLE” will display upon
5 seconds of stability
Stated accuracy
18 to 28°C (64 to 82°F)
Useful range
0 to 40°C (32 to 104°F)
Storage
–40 to 65°C (–40 to 149°F)
Humidity
10% to 90% RH (noncondensing)
Dimensions
(L x W x H)
Without armor:
175mm x 97mm x 42mm
With armor:
180mm x 102mm x 52mm
Weight with
batteries
Without armor: 267g
With armor: 362g
Ingress protection
Meets IEC-529 IP-54 for dust and
water-resistant enclosures
Compliance
(for CE mark)
EN61326-1/A1: 1998
(EU EMC Directive)
- 4 -
5. BATTERY INSTALLATION AND
REPLACEMENT
Voltages present at the thermistors may
also be present at the battery terminals.
Always disconnect the thermistor when
changing batteries.
Weak batteries should not be left in the
instrument. Dead batteries can leak and
cause damage to unit.
The typical battery life is about 700 hours.
Selected settings
will remain in memory
turned
off, or
replac
ed.
are
stored in
even after
while
batteries
memory and
power is
are being
1. Before
2.
3.
changing
off
and disconnect probe
Loosen screw and
the
back
of case.
Remove
the t
4. Insert three
pol
arity.
5.
Install
cover and
battery, tur
lift battery
hree
AA batteries.
new
batteries
tighten
- 5 -
n instrume
.
cover
observing
screw
.
nt
off
6. INSERTING AND REMOVING
OPTIONAL RUBBER ARMOR
1. To insert thermometer into the optional
rubber armor, slide in from the top of
meter before pushing the bottom edges
of meter down to set it into position. Lift
up the stand at the back of meter for
benchtop applications if necessary.
2. To remove thermometer from armor,
push out from the bottom edges of
meter until it is completely out of boot.
- 6 -
7. ASSEMBLING OPTIONAL
HANDS-FREE ACCESORIES
You can use the optional magnets and strap in
the Hands-Free Kit accessories for hands-free
operations.
Figure 1: Hands-Free Kit
- 7 -
8. CONNECTING A THERMISTOR
Thermistor Input
Use the correct thermistor (series 400) for your
instrument. Using an incorrect probe will result
in erroneous readings. (Series 500 thermistor
probes may be used along with the supplied
correction chart to convert meter readings to
actual readings to actual temperature).
Insert the ¼ inch plug into the mating connector
on top of the instrument:
Figure 2: Thermistor Input
- 8 -
9. KEY FUNCTIONS
Toggle between Celsius or Fahrenheit.
Activates Calibration mode for
0°C offset calibration (after field
calibration enabled). Press and hold this
key for 3 seconds to enter Calibration
mode if field calibration
is unprotected.
Activates/deactivates freezing of
the measured reading while in
measurement mode.
Activates/deactivates display of the
minimum and maximum readings (Min
and Max readings are calculated from
the min/max keypress).
Press and hold key for 3 seconds to
clear the MIN/MAX reading stored.
Powers on and shuts off the
thermometer by holding it for 3 sec.
Press this key to activate/deactivate the
backlight display. Backlight will
automatically turn off within 30 seconds
of activation.
°C/°F
cal
hold
min
max
on/off
light
Figure 3: Keypad
- 9 -
10. DISPLAY OVERVIEW
°C/°F
Celsius or Fahrenheit indicator.
MIN
Minimum reading annunciator.
MAX
Maximum reading annunciator.
3 Bars: 700 – 550 hours
2 Bars: 350 – 550 hours
1 Bar: 150 – 350 hours
Blinking: <150 hours
CAL
Blinks during calibration mode.
Remains in display indicating field
calibration is active.
HOLD
Remain in display during hold mode.
STABLE
Displayed upon recognizing final
value.
Err CAL
Error indicator on main digit display
Indicates calibration error due to
out of tolerance value.
Figure 4: Meter Display
- 10 -
11. MEASUREMENT MODE
°c
24.6
°c
HOLD STABLE
Press the on/off key. The meter performs a
self-test and all display digits and indicators
should remain on for approximately 2 seconds
before the meter enters measurement mode.
If a probe is not connected or if the probe
is defective, the display will indicate “OPEN”.
Figure 5: Display when no probe is detected
For optimum instrument accuracy, allow one
minute for ambient temperature stabilization.
If the unit has been stored at an extreme
ambient condition, more time will be needed.
A STABLE indicator appears at the top right
corner of the display when reading is
continuously stable for 5 seconds.
To freeze reading, press hold. Press hold key
again to release the reading and resume
normal operation.
Figure 6: HOLD and STABLE function
The display will show “Ur” (under range) or
“Or” (over range) if the temperature reading is
out of range of the instrument.
- 11 -
12. SELECTING TEMPERATURE SCALE
24.6
°c
75.4
°F
°C/°F
Figure 7: Press °C/°F key to toggle
between °C and °F
Select °C or °F by pressing the °C/°F key. Each
time the key is pressed, the temperature scale
will switch. Switching between °C and °F can
be done at any time during operation.
Each time you turn the instrument on, it will
power up with the same settings that were set
when the unit was last turned off.
13. MIN AND MAX FUNCTION
Press the min/max key to toggle between the
minimum and maximum readings. The
minimum and maximum reading function is
ideal for monitoring unattended operations
while continually displaying every temperature
change that occurs. The minimum and
maximum values are sensed and automatically
stored. To exit and clear the MIN/MAX reading
stored, press and hold the min/max key for
3 seconds.
- 12 -
14. AUTO OFF FUNCTION
A.off
The thermometer has a default auto off function
of 17.5 minutes.
To deactivate this function, press both the
min/max key and the on/off key at the same
time when turning on the thermometer. “A.OFF
no” flashes to show indicate that the auto off
function has been disabled for that session.
Figure 8: Disabling the auto off function
15. CALIBRATION
The CAL function allows single-point calibration
of meter at 0°C (32°F) to compensate for probe
offset error. Use the field calibration feature to
improve thermometer/probe accuracy.
The thermometer comes with a calibration lock
function to prevent accidental changes to
calibration settings. A field calibration can only
be performed when the function has been
unlocked. To unlock field calibration, follow
steps 1 through 4 in FIELD CALIBRATION
UNLOCK section.
To calibrate:
1. Pack sensing end of probe in a container
tightly packed with crushed ice and filled
with distilled water. Allow temperature to
stabilize.
- 13 -
2. Press and release the cal key for
3 seconds to enter the calibration mode.
The CAL indicator starts blinking. Release
the cal key.
3. If the measured temperature is from –5°C
to 5°C (23 to 41°F) when the temperature
reading is stable, press the cal key.
NOTE: Press any key (except the cal key)
while in calibration mode to abort calibration.
The CAL indicator will stop blinking, and the
reading will be set to 0°C (32°F). The CAL
indicator will remain in display, indicating that
field calibration is now active.
If “Err” is displayed, the displayed reading is
outside the above limits.
16. CLEAR FIELD CALIBRATION
To clear user calibration:
1. Turn the thermometer off.
2. Hold the cal key down while pressing the
on/off key.
3. The measurement mode window appears
without the CAL indicator to indicate that
the user calibration has been successfully
cleared.
- 14 -
17. FIELD CALIBRATION UNLOCK
CAL
°c
STABLE
The calibration unlock feature enables field
calibration operation. To unlock field calibration:
1. Turn the thermometer off.
2. Hold the cal key and hold key down
simultaneously, then press the on/off key.
3. The “CAL” indicator appears momentarily
with the version-model window to indicate
that the user-calibration function has been
unlocked successfully (Figure 9).
Figure 9: Successful field calibration unlock
4. When the keys are released, the unit will
go to measurement mode (Figure 10).
Figure 10: Unit goes to measurement mode
- 15 -
18.
°c
STABLE
FIELD CALIBRATION LOCKOUT
The calibration lockout feature prevents any
field calibration changes. The lockout remains
in effect until an unlock has been performed.
To lock the field calibration operation:
1. Turn the thermometer off.
2. Hold the cal key and °C/°F key
simultaneously, then press the on/off key.
3. If field calibration lockout is successful, the
version-model window appears without the
CAL indicator (Figure 11).
Figure 11: Successful field calibration lockout
4. When the cal key is released, the unit will
go to measurement mode (Figure 12).
Figure 12: Unit goes to measurement mode
- 16 -
19. MAINTENANCE
Properly used, the meter should maintain
calibration indefinitely and not require service
other than occasional cleaning of the housing
and changing of the batteries. Do not clean with
abrasives or solvents. Use mild detergents;
never immerse nor use excessive fluid.
20. CLEANING
WARNING:
TO PREVENT IGNITION OF A HAZARDOUS
ATMOSPHERE BY ELECTROSTATIC
DISCHARGE, CLEAN WITH DAMP CLOTH.
Do
not
clean wi
th
mild
detergents,
excessive
abrasives or solven
never immerse nor use
fluid.
ts.
Use
21. BATTERIES
If there is no display when the thermometer is
turned on, check condition of the three AA
batteries. Also check that the battery terminals
are clean and batteries are properly installed.
If replacement is necessary, refer to the
BATTERY INSTALLATION AND
REPLACEMENT section for replacement
procedure.
- 17 -
- 18 -
22. TROUBLESHOOTING
The following chart lists the most probable
faults. There are no internal adjustments or
user-replaceable parts.
Problem
Solution
No display
Check condition of batteries.
Check that batteries are inserted
properly.
Display
shows
“Ur“
Measurement under range
(–40°C / –40°F)
Display
shows
“Or“
Measurement over range
(150°C / 302°F)
Display
shows
“OPEN”
No thermistor probe connected in
the connector.
Display
shows
“Err”
If display shows this message other
than during the field calibration mode,
please return the instrument for
servicing.
- 19 -
23. ACCESSORIES
Replacement Meter and Meter Accessories
Item
Catalog number
Single-input thermistor
thermometer
91428-05
Rubber armor with stand
35427-80
Hands-free kit (two magnets
and a strap)
35427-85
General-purpose 400 Series
probe, SS 316, 5 ft cable,
10" (L) x 0.188" (dia),
4-second time constant.
93824-00
PTFE-coated generalpurpose probe,
10" (L) x 0.2" (dia),
7-second time constant.
93824-12
Penetration probe, 4" (L) x
0.188" (dia), sharp tip,
6-second time constant.
93824-30
Surface probe, 1.0" x
0.81" x 0.25" aluminium
substrate with 0.25" (dia)
hole for screw mount,
8-second time constant.
93823-01
Air/gas probe, 3.75" (L) x
0.25" (dia), 316 SS radiant
heat shield, 2-second time
constant.
93823-05
- 20 -
24. WARRANTY
The Manufacturer warrants this product to
be free from significant deviations from
published specifications for a period of three
years. If repair or adjustment is necessary
within the warranty period, the problem will
be corrected at no charge if it is not due to
misuse or abuse on your part as determined
by the Manufacturer. Repair costs outside
the warranty period, or those resulting from
product misuse or abuse, may be invoiced
to you.
25. PRODUCT RETURN
To limit charges and delays, contact the
seller or Manufacturer for authorization and
shipping instructions before returning the
product, either within or outside of the
warranty period. When returning the product,
please state the reason for the return. For
your protection, pack the carefully and insure
it against possible damage or loss. The
Manufacturer will not be responsible for
damage resulting from careless or
insufficient packing.
- 21 -
26. INNOCAL® CALIBRATION AND
REPAIR SERVICES
(NORTH AMERICA)
Optimum performance of your temperaturemeasuring instrument is not a timeless
condition. To ensure quality measurements,
have your instrument calibrated regularly.
Trust InnoCal to satisfy your calibration and
equipment repair needs. With over a decade
of service, we’ve helped thousands of
customers meet ISO, FDA, EPA,
GLPs/cGMPs and other quality standards.
Conformity*
ISO/IEC 17025:2005 accredited
NIST Handbook 150, 2000 Edition
ANSI/NCSL Z540-2-1997
NIST Technical Note 1297
ISO 9000:2000
Fast Service
Our substantial inventory of replacement
parts ensures a fast turnaround and prevents
costly downtime. Most instruments serviced
in five business days!
Excellent Value
Get quality at a fair price. Our InnoCal
NIST-traceable certificates offer extensive
test data on a broad range of measurement
parameters without breaking the bank!
Reliable Support
Trust in our free diagnostic support and
troubleshooting advice. Our factory-trained
metrologists and technicians are armed
with years of experience and extensive
technical data.
- 22 -
Convenient Reminders
It’s so easy to keep your instruments
functioning properly. Based on your
requirements, InnoCal will send you a
reminder when it’s time to recertify or
service your instrument.
We provide you with the documentation you
need to meet your most stringent quality
requirements for the control of inspection,
measuring, and test equipment.
Certification includes certificate of
calibration with test data, including:
•
Description and identification of the
item certified
•
Condition of the item
•
Issue date
•
Identification of calibration procedure
•
Calibration date
•
As found/as left test data (where
applicable)
•
Signature of technician
•
Statement of estimated uncertainty
•
List of equipment used to perform
calibration (including their calibration
dates)
With today's high quality standards such
as ISO 9000, certification is becoming
increasingly important. Traceability is not a
timeless condition. It must be verified and
maintained over the life of the calibration to
ensure the highest accuracy possible. When
you have your calibration done by InnoCal,
we will send you an automatic reminder
when it is time to recalibrate your instrument.
- 23 -
Are your calibration certificates
good enough?
InnoCal surpasses the competition by
providing the most complete certificates as
required by NIST. All of our certificates
include measured data and point-by-point
measurement uncertainty, and by request,
we’ll provide test accuracy and test
uncertainty ratios at no extra cost. Call us
today and see why InnoCal is The Choice
of Quality.
*See our Scope of Accreditation for any limitations.
Calibration
test points
against
NIST-
traceable
standards
Meter
only
Probe
only
System
(meter +
probe)*
Four test
points across
range of
instrument.
17000-06
17001-06
17002-06
InnoCal—The Choice of Quality
866-INNOCAL (866-466-6225)
InnoCalSolutions.com
For calibration services outside of North
America, please contact your Local
Distributors or Local Certification Body.
TECHNICAL ASSISTANCE
If you have any questions about the use
of this product, please contact the
Manufacturer or authorized seller.
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com
1065DGMAN_91428-05
- 24 -
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