Fluke 80TK Manual

Fluke Ikke kategoriseret 80TK

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Side 1/4

PN 735985 February 1985 Rev.8, 7/07

80TK

HERM

OUP

LE MO

DU L

OFF

Introduction

The Fluke 80TK is a thermocouple converter for use with any

K-type thermocouple and a digital multimeter. The 80TK

accepts the output of any K-type thermocouple and converts it

to 1 mV per degree (Celsius or Fahrenheit).

A three-position switch acts as a power switch as well as

selecting Fahrenheit or Celsius scaling for the output. In

addition, the OFF position of the power switch allows you to

read the battery condition via the external multimeter. The

thermocouple input accepts wire leads or standard mini-

thermocouple connectors.

Temperature is measured by exposing or attaching the

thermocouple to the surface to be measured. The multimeter

displays the temperature directly in degrees Fahrenheit or

Celsius.

Specifications

Electrical

Measurement Range: -50 to 1000 degrees Celsius

-58 to 1832 degrees Fahrenheit

Resolution:

2000 count display: 0.1 °C/F in 200 mV range

1.0 °C/F in 2 V range

3200 count display: 0.1 °C/F in 300 mV range

1.0 °C/F in 3V range

4000 count display: 0.1 °C/F in 400 mV range

1.0 °C/F in 4 V range

Note: Ignore decimal point on 2 V, 3 V, or 4 V range.

Maximum Voltage at Thermocouple Input: 60 V dc, 24V ac

RF Field: Exposure to an rf field interferes significantly with this

module’s capacity to accurately measure temperature with

thermocouples. The interference is temporary and the module

suffers no harm when exposed to an rf field of 3 V/m. Accurate

temperature measurement capability is completely restored

when the module is removed from the rf field.

Common sources of rf fields are handheld 2-way radios and

cellular telephones. If such a source is suspected of interfering

with this module, either turn off the transmitter or increase the

separation between the transmitter and the module.

Environmental

Ambient Operating Range: 0 to 50 °C

Storage Temperature: -40 to 60 °C

-40 to 140 °F

Humidity: 0 % to 90 % (0 to 35 °C)

0 % to 70 % (35 to 50 °C)

Basic Accuracy: (@ 23 ±5 °C Calibration)*

(Applies for one year after purchase or recalibration)

RANGE ACCURACY ± (% of reading +

degrees), 1 year

-20 to 350 °C 0.5 % ± 2 °C

-4 to 662 °F 0.5 % ± 3.6 °F

351 to 500 °C† 1.75 % ± 2 °C

664 to 932 °F†* 1.75 % ± 3.6 °F

501 to 1000 °C 2.0 % ± 2 °C

933 to 1832 °F 2.0 % ± 3.6 °F

-50 to -21 °C 2.5 % ± 2 °C typical

-58 to -5.8 °F 2.5 % ± 3.6 °F typical

Temperature Coefficient:

* 0 °C to 18 °C and 28 °C to 50 °C ambient, multiply the basic

accuracy specification by 0.1 for each degree above 28 or

below 18.

† For accuracy enhancement between 351 °C to 500 °C,

subtract 3 degrees from the reading. The accuracy is now

0.75 % ± 2 °C.

†* For accuracy enhancement between 663 °F and 932 °F,

subtract 5.4 degrees from the reading. The accuracy is now

0.75 % ± 3.6 °F.

Note

The basic accuracy specification does not include the

error of the probe or the DMM. Please refer to the

probe accuracy specification for additional details.

General

Weight: 4.5 oz, 126 g

Overall length: 4 5/8 in, 11.75 mm

Battery: Standard 9 V Battery (NEDA #1604, 6F22, 006P)

Battery Life: 1600+ hours, 6.5 V minimum

Output: 3/4 in spaced banana plugs, 10 MΩ minimum load

resistance

Accessories

80PK-1 (included): Bead Probe 4 ft K-type thermocouple bead

probe, with Teflon tape insulation. Maximum insulation

temperature: 260 °C. Accuracy: ± 2.2 °C or ± 0.75 %

(whichever is greater) from 0 to 800 °C.

80PK-22: Immersion Probe (8.4 in or 21.3 cm from tip to probe

handle)

80PK-3A: Surface Probe (for flat or curved surfaces)

80PK-24: Air Probe (protected by stainless steel baffle)

80PK-25: Piercing Probe (suitable for food use, liquids and

gels)

80PK-26: Exposed Junction Probe (exposed bead attached to

8.5 in probe)

80TK Thermocouple

Module

Instruction Sheet

80PK-27: Industrial Surface Probe

80PK-8: Pipe Clamp Probe (For pipe diameter 1/4 in to 1 7/8

in)

80PK-9: HVAC Probe for piercing pipe insulation for pipe

temperature measurement

80PK-11: K-type Velcro Temperature Probe

80CK-M: Male Mini-Connector (for attachment of K-type

thermocouple wire)

Use and Operation

Thermocouples rely upon the difference in temperature

between the measuring junction and a reference junction.

Traditionally the reference junction is another thermocouple

placed in an ice bath, however, the 80TK uses an electronic

reference junction. The converter (80TK) must be operated in a

thermal environment consistent with its specifications.

Measuring Technique

Making accurate temperature readings using a thermocouple is

a matter of identifying and minimizing the causes of error. The

largest contributor to errors is the thermal interface between

the measurement surface and the thermocouple. The next

largest contributor is the temperature difference between the

thermocouple probe and its environment.

Here are some suggestions for improving the accuracy of your

temperature measurements. Ensure that there is a good

connection between the probe and the surface you are

measuring. You can do this in many ways:

1. Increase the mounting pressure.

2. Use an interface agent (such as silicone grease) between

the thermocouple probe and the surface you are

measuring.

3. Use a thermal epoxy to attach the thermocouple.

When measuring temperatures higher than ambient, adjust the

connection of the probe to the surface until you get the highest

temperature reading. Use any of the suggestions given above

to do so.

When measuring temperatures lower than ambient, adjust the

connection of the probe to the surface until you get the lowest

temperature reading. Use any of the suggestions given above

to do so.

When measuring temperatures near ambient, make the

reading when the multimeter display is most stable.

XWWarning

To avoid electrical shock, do not use this instrument

when voltages exceeding 30 V rms, 42.4 peak, or 60 V dc

are present. The probe tip is electrically connected to

the output terminals.

Temperature Measurement

Follow this procedure to correctly use the 80TK.

1. Plug the 80TK into the multimeter. Ensure that the red

banana plug is plugged into the voltage input and the black

banana plug is plugged into the COM input.

2. Set the multimeter to the 200, 300, or 400 millivolt range.

This setting will read temperatures equal to the number of

millivolts the range has (i.e., 320 °C or F if the millivolt

range reads 320 mV).

3. Use the dc volt setting and ignore the decimal for higher

temperatures than can be accommodated by the millivolt

range. Less resolution is available when using the volt

range.

XWWarning

To avoid electrical shock, if connecting wires to the

input screws, make sure the thermocouple is removed

from the measurement surface. Completely reassemble

the instrument before use.

4. Plug the thermocouple into the 80TK thermocouple input

connector. If the thermocouple does not have a plug

attached, connect the thermocouple wires to the

thermocouple input screws inside the 80TK. The yellow

coded wire (chromel) connects to the screw marked ”+”.

5. Turn on the 80TK and the multimeter.

6. Adjust the thermal connection between the measurement

surface and the thermocouple as described previously.

7. Read the temperature on the multimeter.

Open Thermocouple Reading

If the thermocouple probe has open circuited (i.e. is broken),

the multimeter will read a steady, constant voltage. The voltage

readings are:

Range Reading

C ≥ 1.0V

F ≥ 2.2V

Battery Condition Test

1. Set the power switch to the OFF position.

2. Connect the 80TK to the multimeter.

3. Set the multimeter to the 200, 300, or 400 millivolt dc

range.

4. Read the battery test voltage on the multimeter. A

minimum reading of 75 mV is acceptable and indicates

that approximately 100 hours of battery life remain.

Battery Replacement

XWWarning

To avoid electrical shock, remove the

thermocouple from the measurement surface, or

disconnect the thermocouple from the

instrument before opening the case. Totally

reassemble the instrument before attempting to

use it.

1. Set the power switch to the OFF position.

2. Disconnect the 80TK from the multimeter.

3. Unplug or disconnect the thermocouple.

4. Turn the 80TK so the power switch is facing down.

Remove the single screw located between the banana

plugs.

5. Grasp one case half in each hand. Pull the two halves

apart, beginning at the end with the banana plugs.

6. Remove and replace the battery.

7. Reassemble the 80TK.

8. To reassemble, mate the two case halves at the end with

the thermocouple connector, then "hinge" the two halves

together.

80TK Self Test

The following test is an easy way to verify proper operation of

the 80TK:

1. Follow the Battery Replacement Procedure to open the

case.

2. Using a short piece of bare wire, short the input

thermocouple terminals together.

3. Plug the 80TK into the multimeter.

4. Turn the multimeter and the 80TK on. Set the multimeter

to 200, 300, or 400 mV range.

5. The multimeter should read the ambient room

temperature.

Produkt Specifikationer

Mærke:	Fluke
Kategori:	Ikke kategoriseret
Model:	80TK

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