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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.
Page 3
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 .................................................................................................................. 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
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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
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.
Table 1. Safety Information
• 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
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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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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 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 to freeze or unfreeze the displayed readings.
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
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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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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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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.
o
The allowable adjustment range is ± 5.0
o
± 9.0
F.
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.")
C or K, and
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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
T-type: −250
(-418
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
o
F to +2501 oF)
o
F to +752 oF)
o
F to +1832 oF)
C to +1372 oC
o
C to +400 oC
o
C to +1000 oC
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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
o
C (0.5 oF)]
o
C (-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
o
(0.05
F per oF) outside the specified
o
+18
C to 28 oC (+64 oF to +82 oF) range
[below -100
o
C (-148 oF): add 0.04 % of
o
C per oC
reading for J-, K-, E-, and N-type; and
0.08 % of reading for T-type]
o
Susceptibility: ±2
C (±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)
ITS-90
Applicable
NIST-175
Standards
Accuracy is specified for ambient temperatures between 18 oC
o
(64
F) and 28 oC (82 oF) for a period of 1 year. The above
specifications do not include thermocouple error.
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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