Fluke 725Ex Operating Manual

January 2005 Rev. 2, 5/09

© 2005, 2009 Fluke Corporation, All rights reserved. Specifications are subject to change without notice.
All

product names are trademarks of their respective companies.

725Ex

Multifunction Process Calibrator

Users Manual

®

LIMITED WARRANTY AND LIMITATION OF LIABILITY

Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service. The warranty period is
three years and begins on the date of shipment. Parts, product repairs, and services are warranted for 90 days. This warranty extends only
to the original buyer or end-user customer of a Fluke authorized reseller, and does not apply to fuses, disposable batteries, or to any product
which, in Fluke's opinion, has been misused, altered, neglected, contaminated, or damaged by accident or abnormal conditions of operation
or handling. Fluke warrants that software will operate substantially in accordance with its functional specifications for 90 days and that it has
been properly recorded on non-defective media. Fluke does not warrant that software will be error free or operate without interruption.

Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers only but have no authority to ex­tend a greater or different warranty on behalf of Fluke. Warranty support is available only if product is purchased through a Fluke authorized
sales outlet or Buyer has paid the applicable international price. Fluke reserves the right to invoice Buyer for importation costs of re­pair/replacement parts when product purchased in one country is submitted for repair in another country.

Fluke's warranty obligation is limited, at Fluke's option, to refund of the purchase price, free of charge repair, or replacement of a defective
product which is returned to a Fluke authorized service center within the warranty period.

To obtain warranty service, contact your nearest Fluke authorized service center to obtain return authorization information, then send the
product to that service center, with a description of the difficulty, postage and insurance prepaid (FOB Destination). Fluke assumes no risk
for damage in transit. Following warranty repair, the product will be returned to Buyer, transportation prepaid (FOB Destination). If Fluke
determines that failure was caused by neglect, misuse, contamination, alteration, accident, or abnormal condition of operation or handling,
including overvoltage failures caused by use outside the product’s specified rating, or normal wear and tear of mechanical components,
Fluke will provide an estimate of repair costs and obtain authorization before commencing the work. Following repair, the product will be
returned to the Buyer transportation prepaid and the Buyer will be billed for the repair and return transportation charges (FOB Shipping
Point).

THIS WARRANTY IS BUYER'S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IM­PLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE. FLUKE SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OR
LOSSES, INCLUDING LOSS OF DATA, ARISING FROM ANY CAUSE OR THEORY.

Since some countries or states do not allow limitation of the term of an implied warranty, or exclusion or limitation of incidental or consequen­tial damages, the limitations and exclusions of this warranty may not apply to every buyer. If any provision of this Warranty is held invalid or
unenforceable by a court or other decision-maker of competent jurisdiction, such holding will not affect the validity or enforceability of any
other provision.

11/99

Fluke Corporation
P.O. Box 9090
Everett, WA 98206-9090
U.S.A.

To register your product online, visit register.fluke.com

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

Table of Contents

Title Page

Introduction .................................................................................................................... 1

Contacting Fluke ............................................................................................................ 1

Standard Equipment....................................................................................................... 3

Safety Information .......................................................................................................... 3

Ex Hazardous Areas ...................................................................................................... 3

Faults and Damage ................................................................................................... 8

Safety Regulations .................................................................................................... 9

Certification Information............................................................................................. 10

Getting Acquainted with the Calibrator........................................................................... 10

Input and Output Terminals ....................................................................................... 10

Keys .......................................................................................................................... 12

Display....................................................................................................................... 15

Getting Started ............................................................................................................... 16

Shut Down Mode............................................................................................................ 16

Contrast Adjustment....................................................................................................... 18

Using Measure Mode ..................................................................................................... 19

Measuring Electrical Parameters (Upper Display) ..................................................... 19

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725Ex

Users Manual

Current Measurement with Loop Power.................................................................... 19

Measuring Electrical Parameters (Lower Display) .................................................... 21

Measuring Temperature............................................................................................ 22

Using Thermocouples .......................................................................................... 22

Using Resistance-Temperature Detectors (RTDs)............................................... 25

Measuring Pressure.................................................................................................. 28

Zeroing with Absolute Pressure Modules.................................................................. 29

Using Source Mode ....................................................................................................... 31

Sourcing 4 to 20 mA.................................................................................................. 31

Simulating a 4- to 20-mA Transmitter........................................................................ 31

Sourcing Other Electrical Parameters....................................................................... 31

Simulating Thermocouples........................................................................................ 34

Simulating RTDs ....................................................................................................... 34

Source Pressure Mode ............................................................................................. 37

Setting 0 % and 100 % Output Parameters ................................................................... 39

Stepping and Ramping the Output................................................................................. 39

Manually Stepping the mA Output ............................................................................ 39

Auto Ramping the Output.......................................................................................... 40

Storing and Recalling Setups......................................................................................... 40

Calibrating a Transmitter................................................................................................ 41

Calibrating a Pressure Transmitter ................................................................................ 43

Calibrating an I/P Device ............................................................................................... 45

Switch Test .................................................................................................................... 47

Testing an Output Device .............................................................................................. 48

Replacing the Batteries.................................................................................................. 49

Approved Batteries ........................................................................................................ 50

Maintenance .................................................................................................................. 50

Cleaning the Calibrator ............................................................................................. 50

ii

Contents

Service Center Calibration or Repair......................................................................... 50

Replacement Parts.................................................................................................... 51

Accessories.................................................................................................................... 53

Specifications ................................................................................................................. 55

DC Voltage Measurement ......................................................................................... 55

DC Voltage Source.................................................................................................... 55

Millivolt Measurement and Source* ........................................................................... 55

DC mA Measurement and Source............................................................................. 56

Ohms Measurement .................................................................................................. 56

Ohms Source............................................................................................................. 56

Frequency Measurement........................................................................................... 56

Frequency Source ..................................................................................................... 57

Temperature, Thermocouples ................................................................................... 57

Loop Power Supply ................................................................................................... 57

RTD Excitation (simulation) ....................................................................................... 58

Temperature, RTD Ranges, and Accuracies............................................................. 58

Pressure Measurement ............................................................................................. 59

General Specifications............................................................................................... 59

(continued)

iii

725Ex

Users Manual

iv

List of Tables

Table Title Page

1. Summary of Source and Measure Functions ........................................................................ 2

2. Symbols................................................................................................................................. 8

3. Input/Output Terminals and Connectors................................................................................ 11

4. Key Functions........................................................................................................................ 13

5. Thermocouple Types Accepted............................................................................................. 23

6. RTD Types Accepted ............................................................................................................ 26

7. mA Step Values..................................................................................................................... 40

8. Approved Batteries................................................................................................................ 50

9. Replacement Parts................................................................................................................ 52

10. Fluke Pressure Module Compatibility .................................................................................... 53

11. Pressure Modules ................................................................................................................. 54

v

725Ex

Users Manual

vi

List of Figures

Figure Title Page

1. Standard Equipment.............................................................................................................. 7

2. Input/Output Terminals and Connectors................................................................................ 10

3. Keys ...................................................................................................................................... 12

4. Elements of a Typical Display ............................................................................................... 15

5. Voltage-to-Voltage Test......................................................................................................... 17

6. Adjusting the Contrast ........................................................................................................... 18

7. Measuring Voltage and Current Output................................................................................. 19

8. Connections for Supplying Loop Power................................................................................. 20

9. Measuring Electrical Parameters........................................................................................... 21

10. Measuring Temperature with a Thermocouple...................................................................... 24

11. Measuring Temperature with an RTD, Measuring 2-, 3-, and 4-Wire Resistance ................. 27

12. Gage and Differential Pressure Modules............................................................................... 28

13. Connections for Measuring Pressure .................................................................................... 30

14. Connections for Simulating a 4 to 20- mA Transmitter in a non-Ex hazardous Area............. 32

15. Electrical Sourcing Connections............................................................................................ 33

16. Connections for Simulating a Thermocouple......................................................................... 35

17. Connection for Simulating a 3-Wire RTD............................................................................... 36

vii

725Ex

Users Manual

18. Connections for Sourcing Pressure ...................................................................................... 38

19. Calibrating a Thermocouple Transmitter............................................................................... 42

20. Calibrating a Pressure-to-Current (P/I) Transmitter .............................................................. 44

21. Calibrating a Current-to-Pressure (I/P) Transmitter .............................................................. 46

22. Calibrating a Chart Recorder ................................................................................................ 48

23. Replacing the Batteries......................................................................................................... 49

viii

Multifunction Process Calibrator

Introduction

WWarning

Read "Safety Information" before using the
Calibrator.

The Fluke 725Ex Multifunction Process Calibrator
(hereafter referred to as “the Calibrator”) is a handheld,
battery-operated instrument that measures and sources
electrical and physical parameters. For a summary of
source and measurement functions, see Table 1.
In addition to the functions in Table 1, the Calibrator has
the following features and functions:

• A split-screen display - The upper display allows the

user to measure volts, current, and pressure only.
The lower display allows the user to measure and
source volts, current, pressure, resistance
temperature detectors, thermocouples, frequency,
and ohms.

• Calibrates a transmitter using the split-screen.

• A thermocouple (TC) input/output terminal and

internal isothermal block with automatic reference
junction temperature compensation.

• Stores and recalls setups.

• Manual stepping and automatic stepping and

ramping.

Contacting Fluke

To contact Fluke, call one of the following telephone
numbers:

• Technical Support USA: 1-800-44-FLUKE (1-800-

443-5853)

• Calibration/Repair USA: 1-888-99-FLUKE (1-888-

993-5853)

• Canada: 1-800-36-FLUKE (1-800-363-5853)

• Europe: [phone]

• Japan: [phone]

• Singapore: [phone]

• Anywhere in the world: [phone]

Or, visit Fluke's website at www.fluke.com
To register your product, visit http://register.fluke.com
To view, print, or download the latest manual supplement,
visit http://us.fluke.com/usen/support/manuals

.

.

.

1

725Ex

Users Manual

Function Measure Source

dc V 0 V dc to 30 V dc 0 V dc to 10 V dc

dc mA 0 to 24 mA dc 0 to 24 mA

Frequency 1 CPM to 10 kHz 1 CPM to 10 kHz

Resistance 0 Ω to 3200 Ω 15 Ω to 3200 Ω

Thermocouple Types E, J, K, T, B, R, S, L, U, N, mV, XK, BP

RTD
(Resistance­Temperature
Detector)

Pressure Fluke 700PEx series modules ranging from

Other functions Loop-Power Supply, Step, Ramp, Memory, Dual Display

Table 1. Summary of Source and Measure Functions

Ni120

Pt100 Ω (385)
Pt100 Ω (3926)
Pt100 Ω (3916)

Pt200 Ω (385)

Pt500 Ω (385)
Pt1000 Ω (385)

10 in. H2O to 3,000 psi

Fluke 700PEx series modules ranging from
10 in. H2O to 3,000 psi using an external
pressure source (hand pump)

2

Mulitfunction Process Calibrator
Standard Equipment

Standard Equipment

The items listed below and shown in Figure 1 are included
with the Calibrator. If the Calibrator is damaged or
something is missing, contact the place of purchase
immediately. To order replacement parts, see
Replacement Parts in Table 9.

• TL75 test leads (one set)

• AC72 alligator clips (one set)

• Stackable alligator clip test leads (one set)

• Fluke 725Ex CD-ROM (contains Fluke 725Ex Users

Manual)

• Fluke

• Fluke 725Ex Safety Information

• 4 AA Batteries (installed)

• Hex Key, 5/64 in., short arm

725Ex CCD

Safety Information

A Warning statement identifies conditions and actions that
pose a hazard(s) to the user. A Caution statement
identifies conditions and actions that may damage the
Calibrator or the equipment under test.

Symbols used on the Calibrator and in this manual are
explained in Table 2.

Ex Hazardous Areas

An Ex-hazardous area as used in this manual refers to an
area made hazardous by the potential presence of
flammable or explosive vapors. These areas are also
referred to as hazardous locations, see NFPA 70 Article
500 or CSA C22.1 Section 18.

The Model 725Ex Calibrator has been designed for use in
Ex Hazardous Areas. These are areas where potentially
flammable or explosive vapors may occur. These areas
are referred to as hazardous (classified) locations in the
United States, as Hazardous Locations in Canada, as
Potentially Explosive Atmospheres in Europe and as
Explosive Gas Atmospheres by most of the rest of the
world. The Model 725 Ex calibrator is designed as
intrinsically safe. This means that connecting the 725Ex
calibrator to equipment that is used within intrinsically safe
circuits will not cause an ignition capable arc as long as
the entity parameters are suitably matched.

The Calibrator has two sets of parameters. The Vmax and
Imax parameters show the maximum voltage and
maximum current that may be connected to the Model
725Ex terminals without compromising the intrinsic safety.
The voltage and current will generally come from intrinsic
safety barriers that provide power to the field equipment

3

725Ex

Users Manual

such as transmitters and positioners (I/P devices). These
barriers are identified with a maximum open circuit voltage
parameter (Voc) and a maximum short circuit current
parameter (Isc). The matching criterion requires that Voc
of the barrier not exceed 30 V and Isc not exceed 100 mA.

The Model 725Ex calibrator will itself be a source of
voltage and current. Each set of terminals has a Voc and
an Isc rating as shown on Fluke 725Ex CCD. When
connecting terminals to other equipment, the Vmax and
Imax ratings on the other equipment must exceed the Voc
and Isc ratings for the terminals connected to on the
725Ex calibrator.

In addition to matching voltage and current entity
parameters, it is also necessary to verify that capacitance
and inductance has not been exceeded. Again, Fluke
725Ex CCD identifies the maximum capacitance (Ca) and
maximum inductance (La) that is permitted based either
on the intrinsic safety barrier ratings or on the 725Ex
calibrator ratings for the specific terminals used. As an
example, Fluke 725Ex CCD explains that the capacitance
of each unit connected in the circuit (Ci) plus the
capacitance of the cable in the circuit must not exceed the
maximum allowed capacitance (Ca). Similarly for
inductance in the intrinsically safe circuit.

When connecting the 725Ex calibrator into a powered
circuit, i.e. when the circuit is powered by an intrinsic
safety barrier, then the maximum circuit voltage used for
the entity parameter evaluation will be the higher of either
the 725Ex calibrator Voc or of the barrier Voc. The
maximum current will be the sum of the 725Ex calibrator
Isc and the barrier Isc. In this case, the maximum allowed
inductance (La) will be reduced. This value will have to be
determined using the ignition curves found in standards
such as CSA C22.2 No. 157 or UL 913.

For additional information about Ex Hazardous Areas,
refer to ANSI/ISA-12.01.01-1999 Definitions and
Information Pertaining to Electrical Instruments in
Hazardous (Classified) Locations and to ANSI/ISA­RP12.06.01-2003 Recommended Practice for Wiring
Methods for Hazardous (Classified) Locations
Instrumentation Part 1: Intrinsic Safety.

4

Mulitfunction Process Calibrator
Ex Hazardous Areas

W Warning

To avoid electric shock, injury, damage to the Calibrator, or ignition of an explosive atmosphere,
follow all equipment safety procedures.

• Use the Calibrator only as described in this User Manual and the Fluke

Drawing) or the protection provided by the Calibrator may be impaired.

• Inspect the Calibrator before use. Do not use it if it appears damaged.

• Check the test leads for continuity, damaged insulation, or exposed metal. Replace damaged test leads.

• When using probes, keep fingers behind the finger guards on the probes.

• Never apply more than 30.0 V between the input terminals, or between any terminal and earth ground.

• Applying more than 30.0 V to the input terminals invalidates the Calibrator’s Ex Approval and may

result in permanent damage to the unit so it can no longer be used.

• Use the proper terminals, mode, and range for the measuring or sourcing application.

• To prevent damage to the unit under test, be sure the Calibrator is in the correct mode before

connecting the test leads.

• When making connections, connect the COM test probe before the live test probe. When

disconnecting, disconnect the live probe before the COM probe.

• Never open the Calibrator case. Opening the case invalidates the Calibrator’s Ex Approval.

• Make sure the battery door is closed and latched before entering an Ex hazardous area or using the

Calibrator. See “Ex Hazardous Areas”.

• Replace the battery as soon as the B (low battery) symbol appears to avoid false readings that can

lead to electric shock. Remove the Calibrator from the Ex-hazardous area before opening the battery
door. See “Ex Hazardous Areas”.

• Remove test leads from the Calibrator before opening the battery door.

• Measurement Category I (CAT I) is defined for measurements performed on circuits not directly

connected to the mains.

• Turn off circuit power before connecting the Calibrator mA and COM terminals in the circuit. Place

Calibrator in series with the circuit.

725Ex CCD (Concept Control

5

725Ex

Users Manual

• When servicing the Calibrator, use only specified replacement parts. Do not open the Calibrator case.

Opening the case invalidates the Calibrator’s Ex Approval.

• Do not allow water inside the case.

• Before each use, verify the Calibrator’s operation by measuring a known voltage.

• Never touch the probe to a voltage source when the test leads are plugged into the current terminals.

• Do not operate the Calibrator around explosive dust.

• When using a pressure module, make sure the process pressure line is shut off and depressurized

before connecting it or disconnecting it from the pressure module.

• Use four properly installed AA batteries to power the Calibrator.

• Use only the batteries listed in Table 8.

• Disconnect test leads from the circuit under test before changing to another measure or source

function.

• When measuring the pressure of toxic or flammable gases, care must be taken to minimize the

possibility of leakage. Confirm that all pressure connections are properly sealed.

• Do not use in a damp or wet environment.

WCaution

To avoid possible damage to Calibrator or to equipment under test:

• Disconnect the power and discharge all high-voltage capacitors before testing resistance or continuity.

• Use the proper jacks, function, and range for the measurement or sourcing application.

6

Mulitfunction Process Calibrator
Ex Hazardous Areas

20

0

4

.15

73

26

6

L

AC72

Alligator Clips

Test Lead Set

TL75

Stackable
Test Leads

30V 24mA MAX ALL TERMINALS

SOURCE / MEASURE

mA

+

3W

mA

-

4W

R

1

10

46

0

Z

o

n

STORE

e

0

A

E

x

ia

IIB

1

I.S

7

1

. C

C

la

ss

I D

iv

1

, G

SETUP

ro

u

p

s

B

,C

,D

RECA

LL

V

Hz
RTD

COM

100%

25%

25%

0%

MEASURE

V

TC

mA

LOOP

COM

aly01f.eps

Figure 1. Standard Equipment

7

725Ex

Users Manual

Table 2. Symbols

Symbol Meaning Symbol Meaning

+ Power ON/OFF

J Earth ground )

W

M Battery F Direct current

X Hazardous Voltage f

(

~

Risk of Danger. Important
information. Refer to manual.

Conforms to ATEX requirements

Do not dispose of this product as unsorted municipal waste. Go to Fluke’s website for recycling
information.

T

P Conforms to relevant European Union directives.

;

Faults and Damage

Applying a voltage greater than 30 V to the input of the
Calibrator invalidates its Ex Approval and may impair its
safe operation in an Ex-hazardous area. See “Ex
Hazardous Areas”.

If there is any reason to suspect that the safe operation of
the Calibrator has been affected, it must be immediately
withdrawn from use, and precautionary measures must be

Double insulated

Conforms to relevant Canadian and US Standards.
Certification # LR110460-2

Pressure

Conforms to relevant Australian standards

taken to prevent any further use of the Calibrator in an
Ex-hazardous area. See “Ex Hazardous Areas”.

Fully observe all instructions, warnings, and cautions
contained in this manual. In case of doubt due to
translation and/or printing errors, refer to the original
English users manual.

The safety features and integrity of the unit may be
compromised by any of the following:

8

Mulitfunction Process Calibrator
Ex Hazardous Areas

• External damage to the housing

• Internal damage to the Calibrator

• Exposure to excessive loads

• Incorrect storage of the unit

• Damage sustained in transit

• Correct certification is illegible

• Functioning errors occur

• Permitted limitations are exceeded

• Functioning errors or obvious measurement

inaccuracies occur which prevent further
measurement by the Calibrator

• Opening the case

Safety Regulations

The use of the Calibrator meets the requirements of the
regulations providing that the user observes and applies
the requirements as stated in the regulations and that
improper and incorrect use of the unit is avoided.

• Use must be restricted to the specified application

parameters.

• Do not open the Calibrator.

• Do not remove or install the batteries within the

Ex-hazardous area. See “Ex Hazardous Areas”.

• Do not carry additional batteries within the

Ex-hazardous area. See “Ex Hazardous Areas”.

• Use only type tested batteries. The use of any other

batteries will invalidate the Ex-certification and
present a safety risk.

• Do not use the Calibrator in any circuit where the

voltage or transients may exceed 30 V.

• Only use the Calibrator in circuits with compatible

entity parameters. When the calibrator is used in an
Ex hazardous area, unless the area is known to be
safe, do not connect to any circuits that exceed the
entity parameters defined on Fluke 725Ex CCD
Control Drawing. See “Ex Hazardous Areas”.

9

725Ex

Users Manual

Certification Information

• P ( II 1 G EEx ia IIB 171 °C

0344 KEMA 04ATEX1303

• ) Class I Div. 1 Groups B,C, and D

LR110460 Class I Zone 0 Aex/Ex ia IIB 171 °C

2004.1573226

• Ta = -10 °C… +55 °C

• Manufactured by Martel Electronics, Inc., 1F

Commons Drive
Londonderry, NH, USA

Getting Acquainted with the Calibrator

Input and Output Terminals

Figure 2 shows the Calibrator input and output terminals.
Table 3 explains their use.

MEAS

SOURCE

STORE
SETUP

RECALL

V mA

LOOP

MULTIFUNCTION

725Ex

PROCESS CALIBRATOR

V mA

TC RTD

2004.1573266
LR110460

Zone 0 AEx ia IIB 171 C

I.S. Class I Div 1, Groups B,C,D

1

ZERO

Hz

C °F

°

100%

25%

25%

0%

2

10

8

7

6

5

3

4

aly05f.eps

Figure 2. Input/Output Terminals and Connectors

Mulitfunction Process Calibrator
Getting Acquainted with the Calibrator

Table 3. Input/Output Terminals and Connectors

No Name Description

A

B, C

D

E, F

G, H

Pressure module
connector

MEASURE V, mA
terminals

TC input/output Terminal for measuring or simulating thermocouples. This terminal accepts a miniature

SOURCE/ MEASURE
V, RTD, Hz, Ω
terminals

SOURCE/ MEASURE
mA terminals, 3W, 4W

Connects the Calibrator to a pressure module.

Input terminals for measuring voltage, current, and supplying loop power.

polarized thermocouple plug with flat, inline blades spaced 7.9 mm (0.312 in) center to
center.

Terminals for sourcing or measuring voltage, resistance, frequency, and RTDs.

Terminals for sourcing and measuring current, and performing 3W and 4W RTD
measurements.

11