Fluke 80PK-26 User manual

®
80PK-26
SureGripTM Tapered
Temperature Probe
Instruction Sheet
XWWarning
To avoid electrical shock, do not use this
probe when voltages exceeding 24 V ac rms
or 60 V dc are present. The probe tip is
electronically connected to the output
terminals.
Introduction
The 80PK-26 SureGripTM Tapered Temperature Probe is
essentially a bead probe with a handle that can be used
as a surface probe. The stainless steel sheath allows the
bead to measure temperatures higher than bead probes
with flexible leads. The handle also allows you to apply
more focused surface pressure without having your hand
in close proximity to the source. The 40-inch (1-meter)
cable is terminated with a Type K miniature thermocouple
connector with 0.792-mm (.312-in) pin spacing. The
80PK-26 can be used with any temperature-measuring
instrument that is designed to accept Type K
thermocouples and has miniature connector input.
Specifications
Type
K Standard Grade Ni-Cr vs Ni-Al (Chromel vs Alumel)
Measurement Range
-40 °C to 816 °C (-40 °F to 1500 °F)
Accuracy
(With respect to ANSI MC96.1-1982-Standard Limits of
Error):
Note
All error calculations should be done in
° C, then
scaled to
° F.
Range Accuracy
(% of reading)
-40 °C to 0 °C
(-40 °F to 32 °F)
±2.2 °C
0 °C to 275 °C
(32 °F to 527 °F)
±1.1 °C
275 °C to 816 °C
(527 °F to 1500 °F)
±0.4 %
November 2004
© 2004 Fluke Corporation. All rights reserved.
All product names are trademarks of their respective companies

Output
@ 25 °C (77 °F) = 1.00 mV (reference junction @ 0 °C)
Seebeck Coefficient
25 °C (77 °F) = 40.50 µV / °C
Measurement Time
(Time Constant): 3.0 seconds for air moving at 3.33
meters / second (10.9 feet / second) at sea level pressure
(5 time constants = 1 complete step change, i.e., 15
seconds)
Maximum Voltage
24 V ac rms or 60 V dc
Maximum Temperature of Tip
816 °C (1500 °F)
Sheath
Material: 304 Stainless Steel
Dimensions
Diameter: 4.8 mm (.19 in)
Length: 20.32 cm (8 in)
Bead (sensor) Sheath
Material: Inconel 600
Dimensions
Diameter: 1.5748 mm (.062 in)
Length: 11.049 mm (.435 in)
Grounding
Junction Welded to Sheath.
Cable
Length: 1 meter (40 in)
Insulation
Material: PVC
Maximum Temperature: 105 °C (220 °F)
Jacket Color: Gray
Conductors
Type: K
Size: AWG #24 stranded (7 strands of #32)
Handle
Material: Hytrel
Maximum Temperature: 125 °C (257 °F)
Connector
Type: Mini-thermocouple connector with .792 mm
(.0312 in) pin spacing
Material: Yellow Hytrel
Maximum Temperature: 1.25 °C (257 °F)
Overall Probe Length
31.9 cm (12.55 in) from tip to end of cable strain relief.
Protection
Class 3. Relates solely to insulation and grounding
properties defined in IEC 348.

Measurement Considerations
Instrument Compatibility
The 80PK-26 is compatible with any temperature-
measuring instrument that’s accepts Type K
thermocouples, has a miniature thermocouple connector,
and has cold reference junction compensation. Accuracy
of the temperature-measuring instrument must be
considered along with the 80PK-26 accuracy specification
to determine the overall accuracy of the combination.
Temperature Limitations
The tip area (thermocouple-sheath) of the 80PK-26 has a
continuous temperature rating of 816 °C (1500 °F).
However, the opposite end of the sheath nearest the
handle should not be subjected to temperatures greater
than 125 °C (257 °F). This is the maximum temperature
limitation of the handle.
Media Limitations
The stainless steel sheath should not be exposed to
halides or sulfides. Even though the sheath to junction
transition is sealed, it is not recommended to immerse the
probe in liquid or saturated vapor. The 80PK-26 should not
be used in reducing atmospheres or in a vacuum. Excess
mounting force can deform or crush the bead. With the
probe perpendicular to the measurement surface, do not
apply more than 12.25 new tons (2.75 pounds-force). Use
proportionally less force as the angle to the measurement
surface becomes more acute.
Operation
Use the 80PK-26 as follows:
1. Using the miniature (0.312 inch spacing)
thermocouple, connect the 80PK-26 to a compatible
Type K temperature-measuring instrument.
2. Turn on the measuring instrument, and select the
appropriate range and scale.
3. Check the read out on the measuring instrument. With
no heat or cold source applied to the bead, the
measuring instrument should display the ambient
(room) temperature. If the instrument does not read
out properly, refer to “Troubleshooting”.
Minimizing Thermal Shunting
The 80PK-26 Tapered Temperature Probe should be
inserted at least 6.35 cm (2.5 in) into the environment to
be measured to minimize the shunting effect of the sheath.
Measuring Technique
Here are some suggestions for improving the accuracy of
your temperature measurements:
1. Make sure there is a good connection between
the probe and the surface you are measuring by
doing any of the following:
a. Increase the mounting pressure
b. Use an interface agent (such as silicone grease)
between the thermocouple probe and the surface
you are measuring.
c. Use a thermal epoxy to attach the thermocouple.

2. When measuring higher than ambient temperatures,
adjust the connection between the probe and the
surface until you get the highest temperature reading.
To ensure a good connection, see the suggestions
above.
3. When measuring lower than ambient temperatures,
adjust the connection between the probe and the
surface until you obtain the lowest temperature
reading. To ensure a good connection, see the
suggestions above.
4. When measuring near ambient temperatures, make
the reading when the multimeter when the multimeter
read-out is most stable.
Troubleshooting
With no heat or cold applied to the probe, the measuring
instrument should display the ambient temperature. If the
measuring instrument does not read out properly, try the
following:
1. Verify that the temperature-measuring instrument is
designed to be used with Type K thermocouples. The
temperature-measuring instrument should have a
yellow input connector and / or be marked with a “K”.
2. Check for an open circuit indicator on the measuring
instrument. Some temperature measuring instruments
have a built-in circuit to indicate if the connected
probe is open. (All Fluke Temperature-measuring
instruments have this feature.) Refer to the owner’s
manual accompanying the measuring instrument to
see if this feature is available.
3. Short the two input pins of the measuring instrument
with a piece of wire. If the instrument is functioning, it
should indicate the ambient temperature.
4. If you suspect a broken connection, use an ordinary
ohmmeter to read the continuity of the measuring
instrument from pin to pin. The ohmmeter should read
20 ohms or less if there is continuity.
Scale Conversions
Use the following equation to convert °C to °F:
(°C x 1.8) + 32 = °F
Use the following equation to convert °F to °C:
(°F –32) x 0.5556 = °C

8" (203.2 mm)
Diameter: .125" (3.175 mm)
Tip Diameter: .062" (1.5748 mm)
.435" (11.049 mm)
baj01f.eps
Figure 1. Fluke 80PK-26
Contacting Fluke
For application or operation assistance, or information on
Fluke products, call:
USA: 1-888-44-FLUKE (1-888-443-5853)
Canada: 1-800-36-FLUKE (1-800-363-5853)
Europe: [phone]
Japan: [phone]
Singapore: [phone]
Anywhere in the world: [phone]
For USA Service: 1-888-99-FLUKE
(1-888-993-5853)
Or, visit Fluke's Web site at www.fluke.com.
To register your product, visit register.fluke.com

ONE YEAR LIMITED WARRANTY
This Fluke product will be free from defects in material and
workmanship for one year from the date of purchase. This
warranty does not cover fuses, disposable batteries, or
damage from accident, neglect, misuse, alteration,
contamination, or abnormal conditions of operation or
handling. Resellers are not authorized to extend any other
warranty on Fluke’s behalf. To obtain service during the
warranty period, contact your nearest Fluke authorized
service center to obtain return authorization information,
then send the product to that Service Center with a
description of the problem.
THIS WARRANTY IS YOUR ONLY REMEDY. NO
OTHER WARRANTIES, SUCH AS FITNESS FOR A
PARTICULAR PURPOSE, ARE EXPRESSED OR
IMPLIED. FLUKE IS NOT LIABLE FOR ANY SPECIAL,
INDIRECT, INCIDENTAL OR CONSEQUENTIAL
DAMAGES OR LOSSES, ARISING FROM ANY CAUSE
OR THEORY. Since some states or countries do not allow
the exclusion or limitation of an implied warranty or of
incidental or consequential damages, this limitation of
liability may not apply to you.
Fluke Corporation
P.O. Box 9090
Everett, WA 98206-9090
U.S.A.
Fluke Europe B.V.
P.O. Box 1186
5602 BD Eindhoven
The Netherlands
11/99