Fluke 80PK-3A Handleiding

Fluke Niet gecategoriseerd 80PK-3A

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®
80PK-3A
Type K Thermocouple Surface Probe
Instruction Sheet
WARNING
TO AVOID ELECTRICAL SHOCK, DO NOT USE THIS PROBE
WHEN VOLTAGES EXCEEDING 24V AC RMS OR 60 V DC ARE
PRESENT.THE PROBE TIP IS ELECTRONICALLY CONNECTED
TO THE OUTPUT TERMINALS.
CAUTION
The thermocouple strip in the tip of the probe is designed to
deflect only .030” in normal operation. Any action which bends
or pulls the strip out further from the tip will CONSIDERABLY
reduce the life of the probe
INTRODUCTION
The 80PK-3A Type K Thermocouple Surface Probe is designed for
measuring the temperature of flat or slightly convex surfaces, with
an exposed junction to allow direct contact with the surface being
measured. The 40-inch (1-meter) cable is terminated with a Type K
miniature thermocouple connector with 0.792-mm (0.312 in) pin
spacing. The probe can be used with any temperature-measuring
instrument that is designed to accept type K thermocouples and has
a miniature connector input.
SPECIFICATIONS
Type: K (Chromel vs Alumel)
Measurement Range: 0 °C to 260°C (32°F to 500°F)
Junction Accuracy: (With respect to ANSI MC96.1): ±2.2 °C
(3.96°F) over the range of 0 °C to 260°C (32°F to 500°F)
Restrictions: The 260 °C continuous temperature rating is primarily
determined by the Teflon support piece. The Teflon insulation
should not be exposed to temperatures exceeding 260 °C (500°F)
nor to open flame, since this can cause release of toxic material.
Output: 25°C (77°F) =1.00 mV (reference junction at 0°C)
Seebeck Coefficient: 25 °
C (77°F) = 40.50 µV / °C
Measurement Time: (Time Constant): 3 sec typical on metal
surface; 15 sec max. for a 260°C change. See Applications
Information below.
Maximum Voltage: 24V ac rms or 60V dc
Probe Tip:
Maximum Temperature: 260°C (500°F)
Material: White PTFE
September 1989 Rev. 4, 4/02
©1993-2002 Fluke Corporation. All rights reserved. Printed in U.S.A.
All product names are trademarks of their respective companies
Cable:
Length: 40 inches (1 meter)
Insulation:
Material: PVC
Maximum Temperature: 105°C (220°F)
Conductors:
Type: K
Size: AWG #24 stranded (7 strands of #32)
Handle:
Material: nylon
Maximum Temperature: 105°C (220°F)
Connector:
Type: Yellow mini-thermocouple connector with .792 mm
(.0312 in) pin spacing
Material: Hytrel 5556
Maximum Temperature: 125°C (257°F)
Dimensions: 12.5 mm (1/2 inch) in diameter, 9.4 cm (3.75 inches)
in length.
Protection: Class 3. Relates solely to insulation and grounding
properties defined in IEC 348.
MEASUREMENT CONSIDERATIONS
Instrument Compatibility
The 80PK-3A is designed to be compatible with any temperature-
measuring instrument that accepts type K thermocouples, has a
miniature thermocouple connector, and has cold reference junction
compensation. Accuracy of the temperature measuring instrument
could be considered along with the 80PK-3A accuracy specification
in order to determine the overall accuracy of the combination.
Temperature Limitations
The probe tip has a continuous temperature rating of 260 °C.
However the rest of the assembly is rated for a lower temperature.
See the specifications for further information.
Media Limitations
The Type K thermocouple junction is compatible with clean
oxidizing atmospheres.
Applications information
At high temperatures, a surface temperature probe removes a small
amount of heat from the measured surface. At 260 °C on a polished
metal surface, the temperature at a contact point will be lowered,
typically not more than 2°C. Low temperatures at the contact point
are less likely, and contact response time is quicker, on polished
metal surfaces than on materials with low thermal conductivity, such
as plastic and rough or contaminated surfaces. To obtain the best
thermal contact and performance, the white supporting ring must
make full and firm contact with the measurement surface.
OPERATION
Use the 80PK-3A as follows:
1. Connect the 80PK-3A to a compatible type K temperature
measuring instrument using the miniature thermocouple connector.
2. Turn on the measuring instrument, and select the appropriate
range and scale.
3. Check the readout 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 the TROUBLESHOOTING section below.
MEASURING TECHNIQUE
Here are some suggestions for improving the accuracy of your
temperature measurements:
• When measuring higher than ambient temperatures, adjust
the connection between the probe and the surface until you
get the highest temperature reading.
• When measuring lower than ambient temperatures, adjust the
connection between the probe and the surface until you get
the lowest temperature reading.
• When measuring near ambient temperatures, make the
reading when the thermometer readout 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. It should have a yellow input
connector and / or be marked “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
instruments have this feature.) Refer to the measuring instrument’s
owners manual to see if this feature is available.
If you suspect a broken connection, use an ordinary ohmmeter to
check its continuity from pin to pin. The ohmmeter should read 10
ohms or less if there is continuity.
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.
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

Product specificaties

Merk: Fluke
Categorie: Niet gecategoriseerd
Model: 80PK-3A

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