Calibracion de Temperatura

7/31/2019 Calibracion de Temperatura

1/8

ZERO SPAN

4 to 20 mA

4 Wire RTDTransmitter

RTD Sensor

2200 C

0

50

100

150

200

250300

-200 -100 0 100 200 300 400

Ohms Vs. Temp (PT100)

Technical Data

Temperature Calibration

Fluke 724 Temperature Calibrator

Function

Fluke Temperature Test Tools

Fluke

712

Fluke

714

Fluke

724

Fluke

725

Fluke

741

Fluke

743

Fluke

744

Fluke

55XX

Fluke

50

Series

Temperature plays a key role inmany industrial and commercialprocesses. Examples includemonitoring cooking temperature

in food processing, measuringthe temperature of molten steelin a mill, verifying the tempera-ture in a cold storage warehouseor refrigeration system, or regu-lating temperatures in the dryingrooms of a paper manufacturer.

A temperature transmitter willuse a measuring device to sensethe temperature, and then regu-late a 4-20 mA feed-back loop to a controlelement that affectsthe temperature (Fig.1). The control ele-

ment might consist ofa valve that opens orcloses to allow moresteam into a heatingprocess or more fuel

to a burner. The two most com-mon types of temperature sens-ing devices are the thermocouple(TC) and resistive temperature

detector (RTD).Fluke provides a broad rangeof temperature calibration toolsto help you quickly and reliablycalibrate your temperature in-strumentation. A summary of thetemperature calibration capabili-ties of Fluke Process Tools isshown below.

Figure 1.

Measure temperature from an RTD probe

Measure temperature from a T/C probe Simulate an RTD output Simulate an RTD into pulsed excitation current Simulate a T/C output Simultaneous output a T/C, measure mA Simultaneous output an RTD, measure mA Log a temperature measurement Ramp a temperature signal Loop power supply Multifunction Source and Measure Automatically calibrate temperature switches Electronic data capture Upload documented data to PC Integrated HART communication


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2 Fluke Corporation Temperature Calibration

Typical Temperature Calibration Applications

How to calibrate a Thermocouple input transmitter

The Fluke 724 TemperatureCalibrator can provide the threethings necessary to calibrate atemperature transmitter. You cansource a temperature, provideloop power, and measure theresulting output current. Thefollowing example shows how tocalibrate a Type K TC transmitterthat is ranged from 0-150degrees centigrade, generatingan output current range from4-20 mA.

Basic Calibrator Setup

1. Connect the 724 test leads tothe TC transmitter as shown.The output from the thermo-couple jacks on the 724 willsimulate a temperature inputto the transmitter. The redand black test leads willprovide loop power to thetransmitter and will measurethe current resulting fromtemperature changes into thetransmitter.

2. Power on the 724 calibrator.Select the mA button and theLOOP button to select mea-

sure milliamps with 24V looppower applied.

3. Press the Meas/Source buttonuntil the lower portion of the724 display indicates thesource mode.

4. Depress the TC button until aTC type of K is displayed.

5. Select the C button forcentigrade.

6. Set the Zero Point for thisapplication into the Calibra-tor. To do this set the displayinitially to 0.0C. You can usethe up and down arrow keysto change the output value.Use the left and right arrowsto control which decadevalue of the display is beingchanged. When the displayreads 0.0, hold down the 0%key on the 724 and observethat 0% is displayed in thelower right corner of thescreen. This establishes theZero point for calibration.

7. Set the Span Point in theCalibrator. Set the display tothe desired Span value forcalibration. In this examplethe display should read

150C. Depress the 100% keyand observe that 100% isdisplayed in the lower rightcorner of the screen. Thisestablishes the Span point forcalibration.

Performing an As Found Test8. Depress the 0% key; record

the applied temperature andthe corresponding mAmeasurement.

9. Depress the 25% key (2)times; record the appliedtemperature and the corre-sponding mA measurement.

10.Depress the 100% key; recordthe applied temperature andthe corresponding mAmeasurement.

11. Calculate the errors for eachof the (3) points using thefollowing formula: ERROR =([(I-4)/16]-[(T/TSPAN])*100where Error is in % of span, Iis your recorded mA mea-surement, T is the recordedtemperature and TSPAN is thetemperature input span(100% - 0% points). The errorcalculation table belowshows how to apply theformula to actual recordedmeasurements.

12.If your calculated errors areless than the specifiedinstrument tolerance, the

transmitter has passed theAs-Found test. If the test hasnot passed, perform adjust-ments as necessary.

Adjusting the Transmitter13.Depress the 0% key to source

the proper temperature for a4 mA output. Adjust the zeropotentiometer until thecurrent reading is 4.00 mA.

14.Depress the 100% key tosource the proper temperaturefor a 20 mA output. Adjust theSpan potentiometer until thecurrent reading is 20.00 mA.

15.Depress the 0% key againand adjust the zero potenti-ometer again if necessary, toget a 4.00 mA output.

Perform an As Left TestRepeat steps 8 through 12 tocomplete the full calibrationprocedure on your temperaturetransmitter.

mA Measurement TC Source T Span Formula Error %

4.02 0C 150C ([4.02-4)/16]-[0/150])*100 0.1250

11.95 75C 150C ([11.95-4)/16]-[75/150])*100 -0.3125

20.25 150C 150C ([20.25-4)/16]-[150/150])*100 1.5625

Temperature transmitter error calculation example

100%

25%

25%

RECALL

MEAS

SOURCE

STORESETUP

TC RTD

0%

TEMPERATURECALIBRATOR724

V

F

C

V LOOPmA

VmA

MEASURESOURCE/MEASURE

30VMAX ALLTERMINALS

4W

3W V

RTD

TC

COM COM

LOOP

TEST DC PWR++

Rosemount 444


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Fluke 725 Multifunction Process Calibrator All the temperature capabilities of Fluke 724

below, plus: Measure pressure with Fluke 700Pxx

Pressure Modules Source or measure frequency to 10 kHz Source mA signals

Fluke 741, 743 and 744 DocumentingProcess Calibrators

Measure or simulate JKTERSBLUNCthermocouples

Measure or simulate 7 RTD types, per 712below, plus Cu 10 (47)

Source or measure volts, ohms, mA, frequency Measure pressure with Fluke 700Pxx

Pressure Modules Electronically capture results of automated

procedures Serial communication to PC (743, 744) HART communication (744)

Fluke 724 TemperatureCalibrator

Measure or simulate JKTERSBLUN thermocouples

Measure or simulate 7 RTDtypes (see 712)

Measure or source VDC, Measure 24 mA, with or

without 24 volt loop supply Source TC or RTD while

measuring V or mA Handles pulsed RTD transmit-

ters with pulses >5 ms

Fluke 712 RTD Calibrator

Measure or simulatePt 100 200 500 1000 (385),Pt 100 (3926), Pt 100 (3916)and Ni 120 (672)

Measure or source 15 to3200

Handles pulsed RTDtransmitters

Selectable F or C Banana jacks for 2W, 3W or

4W measurements

Fluke 714 ThermocoupleCalibrator

Measure or simulate JKTERSBLU thermocouples

Measure or source -10 to 75 mV Selectable F or C Thermocouple mini-jack

termination


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Temperature Calibration Fluke Corporation 5

Fluke 51 Series II and 52 Series II

Large backlit dual display shows any combina-tion of T1, T2 (52 only), T1-T2 (52 only), plusMIN, MAX, or AVG

Relative time clock on MIN, MAX, and AVG pro-vides a time reference for major events.

Electronic Offset function allows compensationof thermocouple errors to maximizeoverall accuracy

Measures J, K, T, and E-types ofthermocouples

Readout in C, F, or Kelvin (K).

Fluke 51 Single InputDigital Thermometer

Fluke 52 Dual InputDigital Thermometer

Fluke 53 Single Input DigitalThermometer with data logging

Fluke 54 Dual Input DigitalThermometer with data logging

The Fluke 53 Series II and 54 Series II

Include all the features listed for the 51and 52 Series II plus: Data Logging up to 500 points of data with user

adjustable recording interval Additional thermocouple types R, S, and N (for a

total of 7 different types) Real time clock captures the exact time of day

when events occur Recall function allows logged data to be

easily reviewed on the meter display IR communication port allows data to be ex-

ported to optional FlukeView Temperature PCsoftware for further analysis and graphing

65 Infrared Thermometer

Range -40 to 500C (-40 to932F)

0.1 resolution up to 200 Measurements in less than

1 second Bright laser beam for easy

targeting 8:1 Optical Resolution MIN/MAX reading capture Large backlit dual display

2620T/2635T RecordingThermometers 20 channel precision

thermometer with SPRTReference Probe

Up to 18 channels TCCalibration System

Up to 9 channels RTDCalibration System

NIST/DKD certifiedcalibration to .05C

61 Infrared Thermometer

Easy to use Quick non-contact

temperature measurementsfrom -18 to 275 C(0 to 525 F)

0.2 C or 0.5 F resolution Backlight illuminates the

display in the dark Laser-sighted; 8:1 optical

resolution


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Temperature Test Tool Summary Performance: Selected examples

Function Range Resolution Accuracy Notes

RTD Measure -200 to 800C 0.1C 0.3C 8 RTD typesPT100-385 Simulate -200 to 800C

RTD Measure -200 to 800C 0.1C 0.33C 7 RTD typesPT100-385 Simulate -200 to 800C 0.1C 0.33C

Resistance Measure 0-11,000 .01 .05% + 50 m100 range Simulate 0-11,000 .01 .01% + 40 m

Resistance Measure 15-3200 .1 .1 to 1100 range Simulate 15-3200 .1 .1 to 1

Thermocouple Measure -202 to 1374C 0.1C 0.3C JKTERSBLUNCType K Simulate -202 to 1374C 0.1C 0.3C

Thermocouple Measure 0.1C 1000C + 0.3C

Thermocouple Measure 0.1C 1000C + 0.3C

Thermocouple Measure -200 to 1370C 0.1C 0.3C + 10 V JKTERSBLU plusType K Simulate -200 to 1370C 0.1C 0.3C + 10 V N on 724, 725

mV Measure 0-110 mV .001 mV .25% + .015% FSSource 0-110 mV .001 mV .01% + .005% FS

mV Measure -10 to 75 mV .01 mV .025% + 1 countSource -10 to 75 mV .01 mV .025% + 1 count

Measure mA 0-24 mA .001 mA .020% + 2 count Measure mA 0-24 mA .001 mA .010% + .015% FS Loop Power Supply 24V dc n/a 10%

Dry Well Calibrator: A tempera-ture calibrator that uses a

precision oven to source precisetemperature. This style ofcalibrator is often used for theverification of temperaturesensors.

Excitation current: A constantcurrent applied to an RTD probeto determine actual resistancefor temperature measurement.Typical values are 2 mA or lessto minimize self-heating of theprobe.

IPTS-68: International Practical

Temperature Scale of 1968. Atemperature standard adopted in1968 that uses intrinsic stan-dards to define the measurementof temperature.

ITS-90: International Tempera-ture Scale of 1990. A tempera-

ture standard adopted in 1990that uses intrinsic standards todefine the measurement oftemperature. This standardmodifies the intrinsic standardsof IPTS-68 with additionalintrinsic references.

Lead Resistance Compensation:A compensation method usedwith 3 and 4 wire RTDs andresistance measurement. Thismethod negates the error associ-ated with lead resistance whenmaking an RTD measurement.

Reference Temperature: Thetemperature at which a thermo-couple temperature measure-ment is referenced. For FlukeCalibration tools, this is thetemperature where the thermo-couple mini-plug is connected tothe calibrator.

R: The resistance value of anRTD probe at 0C. Example

PT100-385, R = 100.RTD: Resistance TemperatureDevice, a temperature measure-ment sensor that has predictablechanges in resistance with achange in temperature. The mostcommon RTD is the platinumPT100-385.

Seebeck Effect: Thermoelectriceffect in which the voltagepotential increases with tem-perature (thermocouples) in ajunction of dissimilar metals.

Triple point of water: Thistemperature reference point isthe intrinsic standard at whichwater is liquid, ice and gas. Thisreference point defines 0.01C.

Temperature Terminology

744

743/743B

741/741B

725

724

714

712

53/54

51/52


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Temperature Calibration Fluke Corporation 7

Alloys Fluke 700 Series DPCs

Plug + - Temperature EMF RangeColor Range

White Pt-30% Rh Pt-6% Rh 600 to 1820C, 1.792 to 13.820 mV

B Platinum- Platinum- 1112 to 3308F30% Rhodium 6% RhodiumRed W-5% Re W-26% Re 0 to 2316C, 0 to 37.079 mV

C Tungsten- Tungsten- 32 to 4201F5% Rhenium 26% RheniumPurple Ni-Cr Cu-Ni -250 to 1000C, -9.719 to 76.370 mV

E Nickel- Copper-Nickel -418 to 1832FChromium (Constantan)(Chromel)

Black Iron Fe Cu-Ni -210 to 1200C, -8.096 to 69.555 mV

J Copper-Nickel -346 to 2193F(Constantan)Yellow Ni-Cr Ni-Al -200 to 1372C, -5.891 to 54.886 mV

K Nickel- Nickel- -328 to 2502FChromium Aluminum(Chromel)Blue Fe Cu-Ni -200 to 900C, -8.166 to 53.147 mV

L Iron Copper-Nickel -328 to 1652F(Constantan)Orange Ni-Cr-Si Ni-Si-Mg -200 to 1300C, -3.990 to 47.514 mV

N Nickel-Chromium- Nickel-Silicon- -328 to 2372FSilicon Magnesium(Nicrosil) (Nisil)

Green Pt-13% Rh Pt -20 to 1767C, -0.101 to 21.089 mV

R Platinum- Platinum -4 to 3213F13% RhodiumGreen Pt-10% Rh Pt -20 to 1767C, -0.103 to 18.682 mV

S

Platinum- Platinum -4 to 3213F10% Rhodium

Blue Cu Cu-Ni -250 to 400C, -6.181 to 20.873 mV

T Copper Copper-Nickel -418 to 752F(Constantan)White Cu Cu-Ni -200 to 600C, -5.693 to 34.320 mV

U Copper Copper-Nickel -328 to 1112F

Thermocouples TemperatureConversion

F

4352

4172

3992

3812

3632

3452

3272

3092

2912

2732

2552

2372

2192

2012

1832

1652

1472

1292

1112

932

752

572

392

212

32

-148

-328

C

2400

2300

2200

2100

2000

1900

1800

1700

1600

1500

1400

1300

1200

1100

1000

900

800

700

600

500

400

300

200

100

0

-100

-200

-459 -273

Fixed Points of ITS-90

961.78C Silver freezing point

660.323C Al freezing point

419.527C Zinc freezing point

-38.8344C Mercury triple point

231.928C Tin freezing point

156.5985C Indium freezing point

0.01C H2O triple point

29.7646C Gallium melting point

-189.3442C Argon triple point-218.7916C Oxygen triple point-248.5939C Neon triple point-259.3467C Hydrogen triple point

Application AssistanceTo request copies of these application notes,contact your Fluke sales organizations.

Understanding Specifications (pub ID 10127) Transmitter Calibration (pub ID 10123) HART Transmitter Calibration (pub ID 10179) Limit Switches (pub ID 10121) Pressure Modules (pub ID 10188) Loop Calibration (pub ID 10437)


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Fluke 700TC1 ThermocoupleMini-Plug Kit (11 types)For use with: Fluke 700, 720 or

740 Series Process Calibrators, Fluke714 Thermocouple Thermometer.Description: A kit of 10 mini-plugconnectors:Type J (black), oneType K (yellow), oneType T (blue), oneType E (purple), oneType R/S (green), oneType B or Cu (white), oneType L (J-DIN) (blue), oneType U (T-DIN) (brown), oneType C (red), oneType N (orange), one

Fluke 700TC2 ThermocoupleMini-Plug Kit Type J, K, T, E, R/SFor use with: Fluke 700, 720 or 740Series Process Calibrators, Fluke 714Thermocouple Thermometer.Description: A kit of seven mini-plugconnectors:Type J (black), twoType K (yellow), twoType T (blue), oneType E (purple), oneType R/S (green), one

80T-IR Non-Contact InfraredTemperature ProbesFor quick, non-contact temperaturemeasurement in less than onesecond Instantly measures

temperatures from -18 C to260 C (0 to 500 F)

Highly repeatable readingsdisplayed in C or F

Optical resolution 4:1 Output 1mV/C or 1mV/F

(switch selectable)

80T-IR/E Extended Range,Non-Contact InfraredTemperature ProbeSpecial version of the 80T-IR:

Extended range: 0 to 1,000 F Measures F only (no C)80TK Thermocouple ModuleConverts multimeters with a mVrange into digital thermometers. Converts K-type thermocouple

signals into mV output. Connects to DMM via

standard bannana plugs Switch selectable C or F Range: -50 C to 1000 C

(-58 to 1832 F)

Infrared Temperature Probe -80PK-IRCompatible with Fluke 714, 724,

725, 74X, Fluke 50 Series thermom-eters, Fluke 16 and 89 IV DMMs, thisprobe measures the temperature ofobjects that cant be touched. Measurement range: -18 to

260 C (0 to 500 F)

General Purpose Bead Probes80PK-1 and 80PJ-1Basic, inexpensive thermocouple.Good accuracy and fast response.(Not suitable for liquid immersion.) 80PK-1 for K-type thermometers;

80PJ-1 works for J-Typethermometers

Measurement range: -40 to260 C (-40 to 500 F)K-Type Immersion Probe -80PK-2AGeneral-purpose probe includingliquids and gels. Measurement range: -40 to

982 C (-40 to 1800 F)

K-Type Flat Surface Probe -80PK-3AMeasure the temperature of flat orslightly convex surfaces, such as hotrollers and plates. Exposed junction for direct

contact with surface Measurement range: 0 to 260 C(32 to 500 F)

K-Type Air Probe80PK-4AFor air and non-caustic gasapplications. Probe of 304 stainless steel with

perforated baffle around the bead Measurement range: -40 to 816C

(-40 to 1500 F)

Piercing Probes -80PK-5A and 80PT-5ADesigned for foods, liquids and gels.

Probe made of 304 stainless steel 80PK-5A is compatible withK-Type instruments; 80PT-5Ais designed for use with T-Typethermometers

Measurement range: -40 to260 C (-40 to 500 F)

K-type Exposed Junction Probe -80PK-6AUse both as a surface probe and forinsertion into air and non-corrosivegases. Probe made of 304 stainless steel Measurement range: -40 to 816 C

(-40 to 1500 F)

K-Type Industrial / Heavy DutySurface - Probe - 80PK-7For flat or slightly curved surfaces.

Exposed junction allows directcontact with the surface beingmeasured

Rugged design for extendedservice life

Measurement range: -127 to600 C (-196 F to 1112 F)

K-Type Probe Pipe Clamp Tem-perature Probe-80PK-8Designed for pipes from 6.4 mm(1/4") diameter to 34.9 mm(1-3/8") diameter. Measurement range: -29 C to

149C (-20 F to 300 F)

General Purpose Probes -80PK-9 and 80PJ-9Use as surface probe and forinsertion into air and non-causticgases. Probe constructed of 304

stainless steel 80PK-9 is compatible with K-type

thermometers; 80PJ-9 operateswith J-Type

Measurement range:-40 to 260 C (-40 to 500 F)

Extension Wire Kits - 80PK-EXT,80PJ-EXT and 80PT-EXT

For extending and repairing J, K orT-type thermocouple wires. Kit includes 3 meters of thermo-

couple wire and 1 pair ofmale/female mini-connectors

Maximum continuous exposuretemperature: 260 C (500 F)

Temperature Accessories

Fluke CorporationPO Box 9090, Everett, WA USA 98206

Fluke Europe B.V.PO Box 1186, 5602 BDEindhoven, The Netherlands

For more information call:U.S.A. (800) 443-5853 orFax (425) 446-5116Europe/M-East/Africa(31 40) 2 675 200 orFax (31 40) 2 675 222Canada (800) 36-FLUKE orFax (905) 890-6866

Other countries +1 (425) 446-5500 orFax +1 (425) 446-5116Web access: http://www.fluke.com

2003 Fluke Corporation. All rights reserved.Printed in the Netherlands 4/2003 Pub ID 10308-engRev 02

Fluke. Keeping your worldup and running.

Calibracion de Temperatura

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