®
51 & 52 Series II
Thermometer
Users Manual
English
September 1999
© 1999 Fluke Corporation, All rights reserved. Printed in USA
All product names are trademarks of their respective companies.
Table of Contents
Title
Introduction....................................................................................................................
Page
1
1
4
5
6
7
9
9
9
9
Contacting Fluke.......................................................................................................
Getting Started ..............................................................................................................
Components .............................................................................................................
Display Elements......................................................................................................
Buttons .....................................................................................................................
Using the Thermometer.................................................................................................
Changing Setup Options ...............................................................................................
Entering or Exiting Setup..........................................................................................
Setup Options...........................................................................................................
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 .................................................................................................................. 13
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.................................................................................................................... 14
Replacement Parts and Accessories ............................................................................. 15
ii
51 & 52 Series II
Contacting Fluke
Introduction
To order accessories, receive assistance, or locate the
nearest Fluke distributor or Service Center, call:
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.
1-888-993-5853 in USA & 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
Use the thermometer only as specified in this manual.
Otherwise, the protection provided by the meter may be
impaired.
Address correspondence to:
Fluke Corporation
P.O. Box 9090
Everett, WA 98206-9090
USA
Fluke Europe B.V.
P.O. Box 1186
5602 BD Eindhoven
The Netherlands
Refer to safety information in Table 1 and meter symbols
in Table 2.
Visit us on the World Wide Web at: www.fluke.com
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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.
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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.
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51 & 52 Series II
Users Manual
Table 2. International Symbols
Refer to the manual for information about this
feature.
Complies with European Union directives.
W
P
Battery.
Complies with relevant Canadian Standards
Association directives.
M
•
•
•
Figure 1 and Table 3 describe the components.
Figure 2 and Table 4 describe the display.
Table 5 describes the functions of the buttons.
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:
Then read the following sections.
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51 & 52 Series II
Users Manual
Table 4. Display Elements
Display Elements
A
The thermocouple measurement includes an
offset. See "Changing Setup Options."
2
3
4
5
1
B
C
D
E
F
The displayed readings do not change.
A shift function is in progress.
Setup is in progress.
6
7
Low battery. Replace the batteries.
Primary Display.
10
9
8
Model 51: T1 reading.
Model 52: T1, T2, or T1-T2 reading.
aas02f.eps
Figure 2. Display Elements
G
H
The temperature unit.
Secondary Display: MAX, MIN, AVG, or offset.
Model 52: T1or T2 reading.
I
J
The thermocouple type.
Time Display: The elapsed time.
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51 & 52 Series II
Getting Started
Buttons
Table 5. Buttons
Press A to turn the thermometer on or off.
A
G
Press G, M (CANCEL) to stop displaying the minimum, maximum, and average readings in the
secondary display.
(Shift
function)
Q
Press Q 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.
M
Press M to 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.
C
Press C to switch between Celsius (oC), Fahrenheit (oF), and Kelvin (K).
h
Press h to freeze or unfreeze the displayed readings.
Press h when turning on the thermometer to test the display. All display elements appear.
T
Model 52: Press T 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.)
D
K
Press D to start or exit Setup. (See "Changing Setup Options.")
Press K to scroll to the Setup option you want to change.
Press K to increase the displayed setting.
N
Press N to scroll to the Setup option you want to change.
Press N to decrease the displayed setting.
E
Press E to enter a Setup option.
Press E again to store the displayed setting in memory.
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51 & 52 Series II
Using the Thermometer
Entering or Exiting Setup
Using the Thermometer
When the thermometer is in Setup mode, the display
shows s.
1. Plug the thermocouple(s) into the input connector(s).
2. Press A to turn on the thermometer.
•
Press D to start or exit Setup.
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 "- - - -"
Setup Options
Option
Menu
Item
Settings
Changing Setup Options
Thermocouple
Type
TYPE
J, K, T, or E
Use Setup to change the thermocouple type, offset, sleep
mode, and line frequency settings.
Offset
O
T1 or T2 (Model 52)
The thermometer stores the settings in its memory. Setup
settings reset only when the batteries are removed for
more than 2 minutes.
Sleep Mode
SLP
on (sleep mode on)
or 0FF (sleep mode
off)
Line Frequency
Li ne
50 H (50 Hz)
or 60 H (60 Hz)
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51 & 52 Series II
Users Manual
Sleep mode:
Changing a Setup Option
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.
1. Press K or N to scroll to the setup option you
want to change.
2. Press E to indicate that you want to change this
setting.
3. Press K or N until the setting you want to use
Line frequency:
appears on the display.
For optimum rejection of line noise, the
thermometer must be set for the local line
frequency.
4. Press E 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.
10
51 & 52 Series II
Measuring Temperatures
Notes
Measuring Temperatures
The display shows "- - - -" when a thermocouple
is not connected.
Connecting a Thermocouple
To change the thermocouple type, see “Changing Setup
Options.” The North American ANSI Color Code is:
The display shows 0L (overload) when the
temperature being measured is outside the
thermocouple’s valid range.
Type
J
K
E
T
N
Model 52: If only thermocouple T2 is connected,
the T2 reading appears in the primary display.
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 C 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
T
to toggle between showing the
T1, T2, and T1-T2 readings in the primary or
secondary display.
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51 & 52 Series II
Users Manual
Holding the Displayed Readings
Using the Offset to Adjust for Probe
Errors
1. Press h to freeze the readings on the display.
Use the offset option in Setup to adjust the thermometer’s
readings to compensate for the errors of a specific
thermocouple.
The display shows H.
2. Model 52: Press T to toggle showing the T1, T2, or
T1-T2 readings in the primary or secondary display.
The allowable adjustment range is ± 5.0 oC or K, and
± 9.0 oF.
3. Press h again to turn off the HOLD function.
Viewing the MIN, MAX, and AVG Readings
1. Plug the thermocouple into the input connector.
1. Press M to step through the maximum (MAX),
2. Place the thermocouple in a known, stable
temperature environment (such as an ice bath or a
dry well calibrator).
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.
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.")
2. Press G, M (CANCEL) to exit MIN MAX mode.
12
51 & 52 Series II
Maintenance
Calibration
Maintenance
To ensure that the thermometer performs to its accuracy
specifications, Fluke recommends that you calibrate the
thermometer annually, starting one year after purchase.
Replacing the Batteries
Refer to the safety information in Table 1 before replacing
the batteries.
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."
1. Turn off the thermometer if necessary.
2. Loosen the screw and remove the battery door.
3. Replace the three AA batteries.
Specifications
4. Replace the battery door and tighten the screw.
Environmental
Operating
Temperature
−10 oC to 50 C
Cleaning the Case and Holster
o
(14oF to 122oF)
Use soap and water or a mild commercial cleaner.
Storage Temperature −40oC to +60oC
Wipe with a damp sponge or soft rag.
o
(−40 F to +140oF)
Humidity
0 % to 90 %: −10oC to 35oC
(14oF to 95oF)
0 % to 70 %: −10oC to 50 oC
(14oF to 122oF)
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51 & 52 Series II
Users Manual
General
Weight
80 PK-1 Thermocouple (supplied with
thermometer)
280 g (10 oz)
Type
Type K, Chromel Alumel, bead style
Dimensions
(without
holster)
2.8 cm × 7.8 cm × 16.2 cm
(1.1 in × 3 in × 6.4 in)
Temperature
Range
−40 oC to +260 oC
(−40 oF to +500 oF)
Battery
3 AA batteries
Accuracy
± 1.1 oC (± 2.0 oF)
Certification
Safety
P, ) (TÜV pending)
Electrical
CSA C22.2 No. 1010.1 1992
EN 61010 Amendments 1, 2
Measurement
Range
J-type: −210 oC to +1200 oC
(−346 oF to + 2192 oF)
K-type: −200 oC to +1372 oC
(−328 oF to +2501 oF)
CAT I
OVERVOLTAGE (Installation)
CATEGORY I, Pollution Degree 2
per IEC1010-1*
T-type: −250 oC to +400 oC
(−418 oF to +752 oF)
* 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.
E-type: −150 oC to +1000 oC
(−238 oF to +1832 oF)
Display
Resolution
0.1 oC / oF / K < 1000o
1.0 oC / oF / K ≥ 1000o
14
51 & 52 Series II
Replacement Parts and Accessories
Electrical (cont.)
Replacement Parts and Accessories
Measurement
Accuracy, T1,
T2, or T1-T2
(Model 52)
J-, K-, T-, and E-type: ±[0.05 % of
reading + 0.3 oC (0.5 oF)]
Accessory
Holster and Flex Stand Assembly
AA NEDA 15A IEC LR6 batteries
80PK-1 K-Type Bead Thermocouple
CD-ROM
Part Number
1272438
376756
[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]
Temperature
Coefficient
0.01 % of reading + 0.03 oC per oC
773135
(0.05 oF per oF) outside the
o
specified +18 C to 28 oC (+64oF to
1276106
1276123
+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]
Service Manual
Maximum
1 V (Maximum voltage difference
between T1 and T2)
Differential
Common Mode
Voltage
Temperature
Scale
ITS-90
Applicable
Standards
NIST-175
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.
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51 & 52 Series II
Users Manual
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