Fluke 80PK-3A Operating Manual

80PK-3A

Type K Thermocouple Surface Probe

Instruction Sheet

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 TE RMINALS.

The thermocoupl e str ip in the tip of the probe is desig ne d 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

WARNING

CAUTION

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 Temperatur e: 260°C (500°F) Material: White PTFE

September 1989 Rev. 4, 4/02

Cable:

Length: 40 inches (1 meter) Insulation:

Material: PVC Maximum Temperatur e: 105°C (220°F)

Conductors:

Type: K Size: AWG #24 stranded (7 strands of #32)

Handle:

Material: nylon Maximum Temperatur e: 105°C (220°F)

Connector:

Type: Yellow mini-ther mocouple connector with .79 2 mm (.0312 in) pin spacing Material: Hytrel 5556 Maximum Temperatur e: 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 temperaturemeasuring 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 informa tion

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 poi nt 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 c o ntact and p e rformance, 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.

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