Fluke 50S User Manual

®

50S & 50D

Thermometer

Users Manual
Mode d'emploi
Bedienungs-Handbuch
Manuale d'Uso
Manual de Uso

PN 1278540
September 1999

© 1999 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
1 year 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 cou nt ries 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.

Fluke Corporation
P.O. Box 9090
Everett WA
98206-9090

10/96

Fluke Europe B.V.
P.O. Box 1186
5602 B.D. Eindhoven
The Netherlands

50S & 50D

Introduction

The Fluke Models 50S and 50D Thermometers (“the
thermometer”) are microprocessor-based, digital
thermometers designed to use external J-and K-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.

Replacement Parts and Accessories

Accessory Part Number

Battery, 9V (NEDA 1604, 6F22, or 006P) 696534
80PK-1 K-Type Bead Thermocouple 773135
Service Manual 802413
Holster 890298

1

50S & 50D

Users Manual

Contacting Fluke

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

1-888-993-5853 in USA & Canada
[phone] in Europe
[phone] in Japan
[phone] in Singapore
[phone] from other countries

Address correspondence to:

Fluke Corporation Fluke Europe B.V.
P.O. Box 9090 P.O. Box 1186
Everett, WA 98206-9090 5602 BD Eindhoven
USA The Netherlands

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

2

50S & 50D

Safety Information

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

(N) 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.

3

50S & 50D

Users Manual

WWarning (cont.)

•

Model 50D

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.

• Do not operate if any voltage is present at the

measurement surface.

• When servicing the thermometer, use only specified

replacement parts.

• Do not use the thermometer with any part of the case or

cover removed.

To avoid damaging the thermometer 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

batteries.

• Match the + and − polarities of the battery with the

battery case.

: Measurement errors may occur if voltages on

Caution

4

Components

50S & 50D

Components

1

2

A

Display

B

Controls

C

OFFSET control(s)

4

3

5

6

D

Thermocouple input(s)

E

Battery

F

Case screws

50D

50S

aas10f.eps

5

50S & 50D

Users Manual

Display Elements

10

9

8

7

A

Temperature display.

B

Temperature units.

C

Stored readings are
displayed.*

D

Record mode is active.*

E

Displayed readings are
frozen.

* Model 50D only.

The display shows “- - - - -“ if a thermocouple is open.

6

5 4 3 2

F

T1; or T2 or T1-T2

readings are displayed.

50D)

G

Maximum readings are
displayed.*

H

Minimum readings are
displayed.*

I

Low battery.

J

Thermocouple type.

1

aas11f.eps

(Model

6

50S & 50D

Controls

Controls

ON / OFF

F / C

HOLD Freeze or unfreeze the displayed readings. When

RECORD* Toggle Record mode on and off. (Stores MIN/MAX

T1*

T2* Select the T2 thermocouple input. When pressed

T1-T2* Select the differential temperature measurem ent.
VIEW* Toggle the MIN/MAX readings stored in Record

OFFSET* Optimize measurement accuracy for a

* Model 50D only.

Turn the thermometer on or off.
Switch between Fahrenheit (

pressed during power-up, changes the
thermocouple type.

readings.)
Select the T1 thermocouple input. When pressed

during power-up, T1 changes the display
resolution.

during power-up, selects Scan mode. (The display
continuously cycles between T1, T2, and T1-T2.)

mode on and off.

thermocouple at a particular temperature.

o

F) and Celsius (oC).

7

50S & 50D

Users Manual

Changing to the J-Type Thermocouple

• Press HOLD during power-up.

Changing to Low Resolution

To select the low display resolution [1.0 oC (1.0 oF)]:

1. Turn the thermometer off.

2. Press T1 + ON/OFF for 2 to 3 seconds.
The alternate resolution remains set until the

thermometer is turned off.

Adjusting the Offset

To compensate for thermocouple errors:

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) and allow the readings to stabilize.

3. Simultaneously push and turn the OFFSET control until
the display shows the correct reading.

This adjustment affects calibration.

8

50S & 50D

Specifications

Specifications

General

Weight 280 g (10 oz)
Dimensions

(without holster)
Battery Standard 9V battery (NEDA 1604, 6F22, or 006P)

Protection

Environmental

Operating Temperature
Storage Temper at ur e −40 oC to +60 oC (−40 oF to +140 oF)
Humidity 0 % to 90 %: 0 oC to 35 oC (32 oF to 95 oF)

2.8 cm × 7.5 cm × 16.6 cm
(1.1 in × 3 in × 6.6 in)

Class III as defined in IEC 348, Safety
Requirements for Electronic Apparatus

o

0

C to 50 oC (32 oF to 122 oF)

o

0 % to 70 %: 0

C to 50 oC (32 oF to 122 oF)

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50S & 50D

Users Manual

Electrical

Measurement
Range

Display
Resolution

Measurement
Accuracy

Temperature
Coefficient

K-type: −200 oC to +1370 oC (−328 oF to +2498 oF)
J-type: −200

Low: 1.0 oC or 1.0 oF
High: 0.1

K-type: ±(0.1 % of reading + 0.7 oC)
[±(0.1 % of reading + 1.3

J-type: ±(0.1 % of reading + 0.8
[±(0.1 % of reading + 1.4

0.01 % of reading + 0.0 3 oC (0.03 oF) for [ambient
temperatures from +18

o

C to +760 oC (−328 oF to + 1400 oF)

o

C or 0.2 oF

o

F)]

o

C)

o

F)]

o

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

Maximum
Differential
Common Mode

1 V (Maximum voltage difference between T1 and
T2)

Voltage
Temperature

IPTS-68

Scale
Certification

Applicable

P

, $

NBS 125, IEC 584

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.

Accuracy is unspecified when the input lead length is resonant with the
interfering frequency.

10