Fluke 52-II-NIST User manual

51 & 52 Series II

English
September 1999 Rev.2, 11/10

© 1999-2010 Fluke Corporation, All rights reserved.
All product names are trademarks of their respective companies. Specifications subject to change without notice

Thermometer

Users Manual

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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.

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Table of Contents

Title Page

Introduction .................................................................................................................... 1

Contacting Fluke........................................................................................................ 1

Getting Started ............................................................................................................... 4

Components .............................................................................................................. 5

Display Elements....................................................................................................... 6

Buttons ...................................................................................................................... 7

Using the Thermometer.................................................................................................. 9

Changing Setup Options ................................................................................................ 9

Entering or Exiting Setup........................................................................................... 9

Setup Options............................................................................................................ 9

Changing a Setup Option .......................................................................................... 10

Measuring Temperatures ............................................................................................... 11

Connecting a Thermocouple...................................................................................... 11

Displaying Temperatures........................................................................................... 11

Holding the Displayed Readings................................................................................ 12

Viewing the MIN, MAX, and AVG Readings .............................................................. 12

Using the Offset to Adjust for Probe Errors .................................................................... 12

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51 & 52 Series II

Users Manual

Maintenance .................................................................................................................. 1 3

Replacing the Batteries ............................................................................................. 13

Cleaning the Case and Holster ................................................................................. 13

Calibration................................................................................................................. 13

Specifications................................................................................................................. 13

Environmental ........................................................................................................... 13

General ..................................................................................................................... 14

80 PK-1 Thermocouple (supplied with thermometer) ................................................ 14

Electrical ................................................................................................................... 1 4

Replacement Parts and Accessories ............................................................................. 15

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Introduction

The Fluke Model 51 and Model 52 Thermometers (“the
thermometer”) are microprocessor-based, digital
thermometers designed to use external J-, K-, T-, and E­type 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

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51 & 52 Series II

Users Manual

Table 1. Safety Information

W Warning

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 (

lead to personal injury.

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

thermometer serviced.

• Reflective objects result in lower than actual temperature measurements. These objects pose a burn

hazard.

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

• Do not connect to voltages > 30 V ac rms, 42 V pk, 60 V dc from earth ground.

) appears. The possibility of false readings can

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51 & 52 Series II
Introduction

Table 1. Safety Information (cont.)

W Warning (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.

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51 & 52 Series II

Users Manual

Table 2. International Symbols

W

M

Refer to the manual for information about this
feature.

Battery.

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:

Complies with European Union directives.

P

)

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.

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51 & 52 Series II
Getting Started

Components

5

4

Table 3. Components

xx

 Thermocouple T1 input

 Model 52: Thermocouple T2 input

3

2

1

 Holster

 Display

 Buttons

 Battery door

 Batteries

6

7

aas01f.eps

Figure 1. Components

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51 & 52 Series II

Users Manual

Display Elements

1

10

9

Figure 2. Display Elements

xx

 The thermocouple measurement includes an

Table 4. Display Elements

2

3

4

5

offset. See "Changing Setup Options."

 The displayed readings do not change.

 A shift function is in progress.

6

7

 Setup is in progress.

 Low battery. Replace the batteries.

 Primary Display.

8

aas02f.eps

 The temperature unit.

Model 51: T1 reading.
Model 52: T1, T2, or T1-T2 reading.

 Secondary Display: MAX, MIN, AVG, or offset.

Model 52: T1 or T2 reading.

 The thermocouple type.

 Time Display: The elapsed time.

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51 & 52 Series II
Getting Started

Buttons

Table 5. Buttons




(Shift

function)







 Press  to freeze or unfreeze the displayed readings.



7

Press  to turn the thermometer on or off.

Press ,  (CANCEL) to stop displaying the minimum, maximum, and average readings in the
secondary display.

Press  to 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.

Press  to step through the maximum, minimum, and average readings. When viewing logged
readings, shows the maximum, minimum, and average of the logged readings.

Press

,  (CANCEL) to turn off this display.

Press  to switch between Celsius (oC), Fahrenheit (oF), and Kelvin (K).

Press  when turning on the thermometer to test the display. All display elements appear.
Model 52: Press  to toggle showing the T1, T2, and T1-T2 (differential temperature measurement) in the

primary or secondary display.

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51 & 52 Series II

Users Manual

Table 5. Buttons (cont.)

 Press  to start or exit Setup. (See "Changing Setup Options.")

 Press  to scroll to the Setup option you want to change.

Press  to increase the displayed setting.

 Press  to scroll to the Setup option you want to change.

Press  to decrease the displayed setting.

 Press  to enter a Setup option.

Press  again to store the displayed setting in memory.

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51 & 52 Series II
Using the Thermometer

Using the Thermometer

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

2. Press

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 "- - - -"

 to turn on the thermometer.

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.

Entering or Exiting Setup

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

• Press

 to start or exit Setup.

Setup Options

Option

Thermocouple
Type

Offset  T1 or T2 (Model 52)

Sleep Mode   (sleep mode on) or

Line Frequency   50 H (50 Hz) or

Menu

Item

TYPE J, K, T, or E

Settings

 (sleep mode off)

60 H (60 Hz)

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51 & 52 Series II

Users Manual

Changing a Setup Option

1. Press  or  to scroll to the setup option you

want to change.

2. Press

3. Press

4. Press

 to indicate that you want to change this

setting.

 or  until the setting you want to use

appears on the display.

 to 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.

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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:

Type J K E T N

Color Black Yellow Purple Blue Orange

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  to 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
T1, T2, and T1-T2 readings in the primary or
secondary display.

 to toggle between showing the

Notes

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

The display shows  (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.

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51 & 52 Series II

Users Manual

Holding the Displayed Readings

1. Press  to freeze the readings on the display.

The display shows .

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

3. Press

 again to turn off the HOLD function.

 to toggle showing the T1, T2, or

Viewing the MIN, MAX, and AVG Readings

1. Press  to 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 ,  (CANCEL) to exit MIN MAX mode.

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.")

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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

Operating

Temperature

Storage

Temperature

Humidity

-10 oC to 50 oC (14 oF to 122 oF)

-40 oC to +60 oC (-40 oF to +140 oF)

Non condensing <10

95 % RH: 10

75 % RH: 30

45 % RH: 40

o

o

o

o

C (<50 oF)

C to 30 oC (50 oF to 86 oF)

C to 40 oC (86 oF to 104 oF)

C to 50 oC (104 oF to 122 oF)

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51 & 52 Series II

Users Manual

General

Weight 280 g (10 oz)

Dimensions
(without
holster)

Battery 3 AA batteries

Certification P, )

Safety

EMC EN/IEC 61326-1:2006

CAT I OVERVOLTAGE (Installation)

* Refers to the level of Impulse Withstand Voltage protection

provided. Category 1 products should not be attached to mains
circuits.

2.8 cm × 7.8 cm × 16.2 cm
(1.1 in × 3 in × 6.4 in)

CAN/CSA C22.2 No. 61010-1-04,
ANSI/UL 61010-1:2004, EN/IEC 61010­1:2001

CATEGORY I, Pollution Degree 2
per IEC1010-1*

80 PK-1 Thermocouple (supplied with thermometer)

Type Type K, Chromel Alumel, bead style

Temperature
Range

−40 oC to +260 oC

(−40 oF to +500 oF)

Accuracy ± 1.1 oC (± 2.0 oF)

Electrical

Measurement
Range

Display
Resolution

J-type: -210
(-346

K-type: −200
(-328 oF to +2501 oF)

T-type: −250
(-418 oF to +752 oF)

E-type: −150
(-238

o

C / oF / K <1000o

0.1

o

C / oF / K ≥1000o

1.0

o

C to +1200 oC

o

F to + 2192 oF)

o

C to +1372 oC

o

C to +400 oC

o

o

C to +1000 oC

F to +1832 oF)

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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

Temperature
Scale

J-, K-, T-, and E-type: ±[0.05 % of
reading + 0.3

[below -100
reading for J-, K-, E-, and N-type; and

0.45 % of reading for T-type]

0.01 % of reading + 0.03
(0.05

o

C to 28 oC (+64 oF to +82 oF) range

+18

[below -100
reading for J-, K-, E-, and N-type; and

0.08 % of reading for T-type]

Susceptibility: ±2
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)

ITS-90

o

C (0.5 oF)]

o

C (-148 oF): add 0.15 % of

o

o

F per oF) outside the specified

o

C (-148 oF): add 0.04 % of

C per oC

o

C (±3.6 oF) for 80 MHz

Applicable
Standards

Accuracy is specified for ambient temperatures between 18 oC

o

F) and 28 oC (82 oF) for a period of 1 year. The above

(64
specifications do not include thermocouple error.

NIST-175

Replacement Parts and Accessories

Accessory Part Number

Holster and Flex Stand™ Assembly 1272438

AA NEDA 15A IEC LR6 batteries 376756

80PK-1 K-Type Bead Thermocouple 773135

CD-ROM 1276106

Service Manual 1276123

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