Fluke 725Ex User manual
725Ex
Multifunction Process Calibrator
Users Manual
January 2005 Rev. 3, 5/18
© 2005-2018 Fluke Corporation, All rights reserved. Specifications are subject to change without notice.
All product names are trademarks of their respective companies.
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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 ex-
tend 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 re-
pair/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 IM-
PLIED, 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 conse-
quential damages, the limitations and exclusions of this warranty may not apply to every buyer. If any provision of this Warranty is held inva-
lid 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
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i
Table of Contents
Title Page
Introduction .................................................................................................................... 1
Contact Fluke ................................................................................................................. 1
Standard Equipment ....................................................................................................... 3
Safety Information .......................................................................................................... 3
Ex Hazardous Areas ...................................................................................................... 3
Faults and Damage ................................................................................................... 9
Faults and Damage ................................................................................................... 9
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
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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
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Contents (continued)
iii
Service Center Calibration or Repair ......................................................................... 51
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
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1
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.
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725Ex
Users Manual
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Table 1. Summary of Source and Measure Functions
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
(Resistance-
Temperature Detector)
Ni120
Pt100 Ω (385)
Pt100 Ω (3926)
Pt100 Ω (3916)
Pt200 Ω (385)
Pt500 Ω (385)
Pt1000 Ω (385)
Pressure Fluke 750PEx series modules ranging from
10 inH2O to 3000 psi
Fluke 750PEx series modules ranging from
10 inH2O to 3000 psi using an external
pressure source (hand pump).
Other functions Loop-Power Supply, Step, Ramp, Memory, Dual Display
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Mulitfunction Process Calibrator
Standard Equipment
3
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 with caps (one set)
• Alligator clips (one set)
• Stackable alligator clip test leads (one set)
• Fluke 725Ex CCD
• Fluke 725Ex Safety Information
• 4 AA Batteries (installed)
• Hex Key, 5/64 in., short arm
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
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 (NFPA 70 Article 500), as Hazardous
Locations in Canada (CSA C22.1 Section 18), and as
Explosive Gas Atmospheres by most of the rest of the
world. The Model 725Ex 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
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 Calibrator will itself be a source of voltage and
current. Each set of terminals has a Voc and an Isc rating
as shown on the Calibrator CCD. When connecting
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725Ex
Users Manual
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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, the
Calibrator CCD identifies the maximum capacitance (Ca)
and maximum inductance (La) that is permitted based
either on the intrinsic safety barrier ratings or on the
Calibrator ratings for the specific terminals used. As an
example, the Calibrator 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). Use a similar
approach for inductance in the intrinsically safe circuit.
When connecting the Calibrator into a powered circuit, that
is, 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
Calibrator Voc or of the barrier Voc. The maximum current
will be the sum of the 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-12.01.01-2013 Definitions and
Information Pertaining to Electrical Instruments in
Hazardous (Classified) Locations and to ANSI/ISA-
RP12.06.01-2003 Recommended Practice for Wiring
Methods for Hazardous (Classified) Locations
Instrumentation Part 1: Intrinsic Safety.
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Mulitfunction Process Calibrator
Ex Hazardous Areas
5
W Warning
To prevent fire, explosion, or personal injury:
• Use the Calibrator only as described in this User Manual and the Fluke 725Ex CCD (Concept Control
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 Calibrator 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 device under test, be sure the Calibrator is in the correct mode before
connecting the test leads.
• 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”.
• 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.
• 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.
• 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.
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