• Fluke 51 Ii Calibration Manual
• Fluke 51 Ii Thermometer Manual
• Fluke 51 Ii Thermometer User Manual Online
• Fluke 51 Ii Thermometer Manual
• Fluke 51 Ii Thermometer User Manual 2016

The Fluke 51 II single input digital thermometer delivers fast response with laboratory accuracy (0.05% + 0.3°C). You can use the 51 II to measure contact temperature on motors, insulation, breakers, pipes, corroded connections, liquids, and wires with industrial standard J, K, T, or E-type thermocouple temperature sensors.

®

PN

1276114

September 1999 Rev. 2, 3/11

© 1999-2011 Fluke Corporation. All rights reserved. Printed in USA. Specifi-
cations are subject to change without notice.
All product names

are trademarks of their respective companies.

51-54 Series II

Thermometer

Características de los productos

Informações gerais sobre o produto

Productoverzicht

Produktoversikt

Oversigt over termometerserien

Yleiskatsaus

Produktöversikt

Produktübersicht

Descrizione generale del prodotto

Présentation du produit

Product Overview

• 51-54 Series II Product Overview
• Changing Setup Options
• Specifications

®

51 & 52 Series II

Thermometer

Users Manual

English

September 1999 Rev.1, 6/01

© 1999-2001 Fluke Corporation, All rights reserved. Printed in USA All product names are trademarks of their respective companies.

Limited Warranty & Limitation of Liability

This Fluke product will be free from defects in material and workmanship for 3 years from the date of purchase. This warranty does not cover fuses, disposable batteries or damage from accident, neglect, misuse 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, send your defective tester to the nearest Fluke Authorized 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.

To register your product, visit www.fluke-warranty.com

10/96

Table of Contents

51 & 52 Series II

Users Manual

Introduction

The Fluke Model 51 and Model 52 Thermometers (“the thermometer”) are microprocessor-based, digital thermometers designed to use external J-, K-, T-, and E- type thermocouples (temperature probes) as temperature sensors.

Use the thermometer only as specified in this manual. Otherwise, the protection provided by the meter may be impaired.

Refer to safety information in Table 1 and meter symbols in Table 2.

51 & 52 Series II

Contacting Fluke

To order accessories, receive assistance, or locate the nearest Fluke distributor or Service Center, call:

1-888-99-FLUKE (1-888-993-5853) in USA

1-800-36-FLUKE (1-800-363-5853) in Canada

+31-402-678-200 in Europe

+81-3-3434-0181 in Japan

+65-738-5655 in Singapore

+1-425-446-5500 from other countries

Visit us on the World Wide Web at: www.fluke.com

To register your product, visit www.fluke-warranty.com

51 & 52 Series II

Users Manual

Table 1. Safety Information

WWarning

A Warning identifies conditions and actions that pose hazards to the user. To avoid electrical shock or personal injury, follow these guidelines:

∙Before using the thermometer inspect the case. Do not use the thermometer if it appears damaged. Look for cracks or missing plastic. Pay particular attention to the insulation around the connectors.

∙Disconnect the thermocouple(s) from the thermometer before opening the case.

∙Replace the batteries as soon as the battery indicator (B) appears. The possibility of false readings can lead to personal injury.

∙Do not use the thermometer if it operates abnormally. Protection may be impaired. When in doubt, have the thermometer serviced.

∙Do not operate the thermometer around explosive gas, vapor, or dust.

∙Do not apply more than the rated voltage, as marked on the thermometer, between the thermocouple(s), or between any thermocouple and earth ground.

51 & 52 Series II

Introduction

Table 1. Safety Information (cont.)

WWarning (cont.)

∙Model 52: Measurement errors may occur if voltages on the measurement surfaces result in potentials greater than 1 V between the two thermocouples. When potential differences are anticipated between the thermocouples, use electrically insulated thermocouples.

∙When servicing the thermometer, use only specified replacement parts.

∙Do not use the thermometer with any part of the case or cover removed.

Caution

A Caution identifies conditions and actions that may damage the meter or the equipment under test.

∙Use the proper thermocouples, function, and range for your thermometer.

∙Do not attempt to recharge the batteries.

∙To prevent explosion, do not throw batteries into a fire.

∙Follow local laws or regulations when disposing of batteries.

∙Match the + and − polarities of the battery with the battery case.

51 & 52 Series II

Users Manual

Table 2. International Symbols

WRefer to the manual for information about this feature.

MBattery.

Getting Started

Everything in this Users Manual applies both to Models 51 and 52 unless otherwise indicated.

To become familiar with the thermometer, study the following:

PComplies with European Union directives.

Complies with relevant Canadian Standards Association directives.

∙Figure 1 and Table 3 describe the components.

∙Figure 2 and Table 4 describe the display.

∙Table 5 describes the functions of the buttons. Then read the following sections.

51 & 52 Series II

Getting Started

Table 3. Components

AThermocouple T1 input

BModel 52: Thermocouple T2 input

CHolster

DDisplay

EButtons

FBattery door

GBatteries

51 & 52 Series II

Users Manual

Display Elements

2 3 4

5

1

aas02f.eps

Figure 2. Display Elements

Table 4. Display Elements

AThe thermocouple measurement includes an offset. See 'Changing Setup Options.'

BThe displayed readings do not change.

CA shift function is in progress.

DSetup is in progress.

ELow battery. Replace the batteries.

FPrimary Display.

Model 51: T1 reading.

Model 52: T1, T2, or T1-T2 reading.

GThe temperature unit.

HSecondary Display: MAX, MIN, AVG, or offset. Model 52: T1or T2 reading.

IThe thermocouple type.

JTime Display: The elapsed time.

51 & 52 Series II

Getting Started

Buttons

Table 5. Buttons

APress Ato turn the thermometer on or off.

GPress G, M(CANCEL) to stop displaying the minimum, maximum, and average readings in the

secondary display.

(Shift

function)

QPress Qto turn the backlight on and off. The backlight turns off after 2 minutes without any button presses. If the battery is low, the backlight is disabled.

MPress Mto step through the maximum, minimum, and average readings. When viewing logged readings, shows the maximum, minimum, and average of the logged readings.

Press G, M(CANCEL) to turn off this display.

CPress Cto switch between Celsius (oC), Fahrenheit (oF), and Kelvin (K).

hPress hto freeze or unfreeze the displayed readings.

Press hwhen turning on the thermometer to test the display. All display elements appear.

TModel 52: Press Tto toggle showing the T1, T2, and T1-T2 (differential temperature measurement) in the primary or secondary display.

51 & 52 Series II

Users Manual

Table 5. Buttons (cont.)

DPress Dto start or exit Setup. (See 'Changing Setup Options.')

KPress Kto scroll to the Setup option you want to change. Press Kto increase the displayed setting.

NPress Nto scroll to the Setup option you want to change. Press Nto decrease the displayed setting.

EPress Eto enter a Setup option.

Press Eagain to store the displayed setting in memory.

51 & 52 Series II

Using the Thermometer

1.Plug the thermocouple(s) into the input connector(s).

2.Press Ato turn on the thermometer.

After 1 second the thermometer displays the first reading. If no thermocouple is plugged into the selected input or the thermocouple is 'open,' the display shows '- - - -'

When the thermometer is in Setup mode, the display shows s.

∙Press Dto start or exit Setup.

Setup Options

Changing Setup Options

Use Setup to change the thermocouple type, offset, sleep mode, and line frequency settings.

The thermometer stores the settings in its memory. Setup settings reset only when the batteries are removed for more than 2 minutes.

51 & 52 Series II

Users Manual

Changing a Setup Option

1.Press Kor Nto scroll to the setup option you want to change.

2.Press Eto indicate that you want to change this setting.

3.Press Kor Nuntil the setting you want to use appears on the display.

4.Press Eto store the new setting in memory.

Notes

Setup is disabled in MIN MAX mode.

Offset:

The primary display shows the temperature plus the offset and the secondary display shows the offset. Remember to reset the offset to 0.0 when it is no longer needed. The offset automatically resets to 0.0 when you change the thermocouple type. Model 52: You can store individual offsets for T1 and T2.

Sleep mode:

The thermometer enters sleep mode if no button press occurs for 20 minutes. Pressing any button wakes the thermometer and returns it to its previous state. Sleep mode becomes enabled each time you turn on the thermometer and is automatically disabled in MIN MAX mode.

Line frequency:

For optimum rejection of line noise, the thermometer must be set for the local line frequency.

51 & 52 Series II

Measuring Temperatures

Measuring Temperatures

Connecting a Thermocouple

To change the thermocouple type, see “Changing Setup Options.” The North American ANSI Color Code is:

1.Plug a thermocouple into the input connector(s). (Make sure that the polarity is correct.)

2.Set the thermometer for the correct thermocouple type.

Displaying Temperatures

1.Press Cto select the correct temperature scale.

2.Hold or attach the thermocouple(s) to the measurement location.

The temperature reading appears in the primary display.

3.Model 52: Press Tto toggle between showing the T1, T2, and T1-T2 readings in the primary or secondary display.

Notes

The display shows '- - - -' when a thermocouple is not connected.

The display shows 0L (overload) when the temperature being measured is outside the thermocouple’s valid range.

Model 52: If only thermocouple T2 is connected, the T2 reading appears in the primary display.

51 & 52 Series II

Users Manual

Holding the Displayed Readings

1.Press hto freeze the readings on the display. The display shows H.

2.Model 52: Press Tto toggle showing the T1, T2, or T1-T2 readings in the primary or secondary display.

3.Press hagain to turn off the HOLD function.

Viewing the MIN, MAX, and AVG Readings

1.Press Mto step through the maximum (MAX), minimum (MIN), or the average (AVG) readings.

The elapsed time since entering MIN MAX mode, or the time at which the minimum or maximum occurred, appears on the display.

2.Press G, M(CANCEL) to exit MIN MAX mode.

Fluke 51 Ii Calibration Manual

Using the Offset to Adjust for Probe Errors

Use the offset option in Setup to adjust the thermometer’s readings to compensate for the errors of a specific thermocouple.

The allowable adjustment range is ± 5.0 oC or K, and

± 9.0 oF.

1.Plug the thermocouple into the input connector.

2.Place the thermocouple in a known, stable temperature environment (such as an ice bath or a dry well calibrator).

3.Allow the readings to stabilize.

4.In Setup change the offset until the primary display reading matches the calibration temperature. (See 'Changing Setup Options.')

51 & 52 Series II

Maintenance

Maintenance

Replacing the Batteries

Refer to the safety information in Table 1 before replacing the batteries.

1.Turn off the thermometer if necessary.

2.Loosen the screw and remove the battery door.

3.Replace the three AA batteries.

4.Replace the battery door and tighten the screw.

Cleaning the Case and Holster

Use soap and water or a mild commercial cleaner. Wipe with a damp sponge or soft rag.

Calibration

To ensure that the thermometer performs to its accuracy specifications, Fluke recommends that you calibrate the thermometer annually, starting one year after purchase.

To calibrate the thermometer, contact Fluke for the Service Center nearest you or follow the calibration procedure in the service manual listed in 'Replacement Parts and Accessories.'

Specifications

Environmental

−10 oC to 50 oC (14 oF to 122 oF)

−40 oC to +60 oC (−40 oF to +140 oF)

Non condensing <10 oC (<50 oF)

95% RH: 10 oC to 30 oC (50 oF to 86 oF) 75% RH: 30 oC to 40 oC (86 oF to 104 oF) 45% RH: 40 oC to 50 oC (104 oF to 122 oF)

51 & 52 Series II

Users Manual

Weight

Dimensions (without holster)

Fluke 51 Ii Thermometer Manual

Battery

Certification

Safety

CAT I

280 g (10 oz)

2.8 cm ´ 7.8 cm ´ 16.2 cm

(1.1 in ´ 3 in ´ 6.4 in)

3 AA batteries

P, )s

CSA C22.2 No. 1010.1 1992

EN 61010 Amendments 1, 2

OVERVOLTAGE (Installation) CATEGORY I, Pollution Degree 2 per IEC1010-1*

* Refers to the level of Impulse Withstand Voltage protection provided. Equipment of OVERVOLTAGE CATEGORY I is equipment for connection to circuits in which measures are taken to limit the transient over voltages to an appropriate low level. Example include protect electronic circuits.

Type

Temperature

Range

Accuracy

Electrical

Measurement

Range

Display

Resolution

Type K, Chromel Alumel, bead style

-40 oC to +260 oC (-40 oF to +500 oF)

± 1.1 oC (± 2.0 oF)

J-type: -210 oC to +1200 oC (-346 oF to + 2192 oF)

K-type: -200 oC to +1372 oC (-328 oF to +2501 oF)

T-type: -250 oC to +400 oC (-418 oF to +752 oF)

E-type: -150 oC to +1000 oC (-238 oF to +1832 oF)

0.1 oC / oF / K < 1000o 1.0 oC / oF / K ³ 1000o

51 & 52 Series II

Replacement Parts and Accessories

Electrical (cont.)

Measurement Accuracy, T1, T2, or T1-T2

(Model 52)

Temperature

Coefficient

Electromagnetic

Compatibility

Maximum

Differential

Common Mode

Voltage

J-, K-, T-, and E-type: ±[0.05 % of reading + 0.3 oC (0.5 oF)]

[below −100 oC (−148 oF): add 0.15 % of reading for J-, K-, E-, and N-type; and 0.45 % of reading for T-type]

0.01 % of reading + 0.03 oC per oC (0.05 oF per oF) outside the specified +18 oC to 28 oC (+64 oF to +82 oF) range

[below -100 oC (-148 oF): add 0.04 % of reading for J-, K-, E-, and N-type; and 0.08 % of reading for T-type]

Susceptibility: ±2 oC (±3.6 oF) for 80 MHz to 200 MHz in 1.5 V/m field, for 200 MHz to 1000 MHz in 3 V/m field.

Emmisions: Commercial Limits per EN50081-1

1 V (Maximum voltage difference between T1 and T2)

Accessory

Holster and Flex Standä Assembly

AA NEDA 15A IEC LR6 batteries

80PK-1 K-Type Bead Thermocouple

CD-ROM

Service Manual

Temperature ITS-90

Fluke 51 Ii Thermometer User Manual Online

Scale

Applicable NIST-175

Standards

Accuracy is specified for ambient temperatures between 18 oC (64 oF) and 28 oC (82 oF) for a period of 1 year. The above specifications do not include thermocouple error.

51 & 52 Series II

Users Manual

Fluke 51 Ii Thermometer Manual

Fluke 51 Ii Thermometer User Manual 2016