Fluke Thermostat 51 Series User Manual

®
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.  
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Table of Contents  
Title  
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  
i
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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  
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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.  
1-888-99-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  
Use the thermometer only as specified in this manual.  
Otherwise, the protection provided by the meter may be  
impaired.  
Address correspondence to:  
Refer to safety information in Table 1 and meter symbols  
in Table 2.  
Fluke Corporation  
P.O. Box 9090  
Everett, WA 98206-9090  
USA  
Fluke Europe B.V.  
P.O. Box 1186  
5602 BD Eindhoven  
The Netherlands  
Visit us on the World Wide Web at: www.fluke.com  
To register your product, visit www.fluke-warranty.com  
1
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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.  
2
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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.  
3
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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.  
4
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51 & 52 Series II  
Getting Started  
Components  
Table 3. Components  
Thermocouple T1 input  
xx  
A
B
C
D
E
F
G
Model 52: Thermocouple T2 input  
3
Holster  
2
Display  
1
4
5
Buttons  
Battery door  
Batteries  
6
7
aas01f.eps  
Figure 1. Components  
5
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51 & 52 Series II  
Users Manual  
Table 4. Display Elements  
Display Elements  
xx  
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
Low battery. Replace the batteries.  
Primary Display.  
7
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.  
6
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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.  
Model 52: Press T to toggle showing the T1, T2, and T1-T2 (differential temperature measurement) in the  
primary or secondary display.  
T
7
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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.  
8
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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)  
9
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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  
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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.  
11  
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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.  
1. Plug the thermocouple into the input connector.  
Viewing the MIN, MAX, and AVG Readings  
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  
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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  
Cleaning the Case and Holster  
o
Operating  
Temperature  
10 oC to 50 C  
(14 oF to 122 oF)  
Use soap and water or a mild commercial cleaner.  
Storage  
Temperature  
40 oC to +60 oC  
Wipe with a damp sponge or soft rag.  
o
(40 F to +140 oF)  
Humidity  
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)  
13  
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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)  
Accuracy  
± 1.1 oC (± 2.0 oF)  
Battery  
3 AA batteries  
Certification  
Safety  
P, ) s  
Electrical  
Measurement  
Range  
J-type: 210 oC to +1200 oC  
(346 oF to + 2192 oF)  
CSA C22.2 No. 1010.1 1992  
EN 61010 Amendments 1, 2  
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  
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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  
(0.05 oF per oF) outside the  
o
specified +18 C to 28 oC (+64 oF  
773135  
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]  
1276106  
1276123  
Service Manual  
Electromagnetic Susceptibility: ±2 oC (±3.6 oF) for 80  
Compatibility  
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  
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.  
15  
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51 & 52 Series II  
Users Manual  
16  
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