Fluke 28 II Ex Parts list manual

PN 3945752
November 2011 Rev. 1, 10/17
© 2011-2017 Fluke Corporation. All rights reserved. Printed in USA. Specifications are subject to change without notice.
All product names are trademarks of their respective companies.
28 II Ex
True-rms Digital Multimeter

LIMITED WARRANTY AND LIMITATION OF LIABILITY
This Fluke product will be free from defects in material and workmanship for three years from the date of purchase. This
warranty does not cover fuses, disposable batteries, or damage from accident, neglect, misuse, alteration, contamination, 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, 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 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.
Fluke Corporation
P.O. Box 9090
Everett, WA 98206-9090
U.S.A.
Fluke Europe B.V.
P.O. Box 1186
5602 BD Eindhoven
The Netherlands
ООО «Флюк СИАЙЭС»
125167, г. Москва,
Ленинградский проспект дом 37,
корпус 9, подъезд 4, 1 этаж
11/99

i
Table of Contents
Title Page
Introduction .................................................................................................................... 1
How to Contact Fluke..................................................................................................... 1
Safety Information .......................................................................................................... 2
Ex Safety Information..................................................................................................... 2
Errors and Load Restrictions.......................................................................................... 6
Features......................................................................................................................... 8
Automatic Power-Off ................................................................................................. 14
Input Alert™ Feature ................................................................................................. 14
Power-Up Options ..................................................................................................... 15
Maintenance................................................................................................................... 16
General Maintenance ................................................................................................ 16
Fuse Test .................................................................................................................. 16
How to Replace the Batteries .................................................................................... 17
How to Replace the Fuses ........................................................................................ 20
Service and Parts........................................................................................................... 20

28 II Ex
Getting Started Manual
ii
General Specifications................................................................................................... 23
Detailed Specifications .................................................................................................. 25
AC Voltage................................................................................................................ 25
DC Voltage, Conductance, and Resistance.............................................................. 26
Temperature ............................................................................................................. 27
AC Current................................................................................................................ 27
DC Current................................................................................................................ 28
Capacitance.............................................................................................................. 28
Diode ........................................................................................................................ 29
Frequency................................................................................................................. 29
Frequency Counter Sensitivity and Trigger Levels.................................................... 29
Duty Cycle (Vdc and mVdc)...................................................................................... 30
Input Characteristics ................................................................................................. 30
MIN MAX Recording ................................................................................................. 31

1
Introduction
XW Warning
Read “Safety Information” before using the
Product.
The 28 II Ex Digital Multimeter (the Product) is a compact
easy to operate measurement tool for electrical and
electronic circuits.
Read the entire Users Manual and the
Safety Instructions before you use the Product.
How to Contact 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]
•China: 86-400-921-0835
•Singapore: [phone]
•Anywhere inthe world: [phone]
Or, visit Fluke's website at www.fluke.com.
To register your product, visit http://register.fluke.com.
To see, print, or download the latest manual supplement,
visit http://us.fluke.com/usen/support/manuals.

28 II Ex
Getting Started Manual
2
Safety Information
A Warning identifies conditions and procedures that are
dangerous to the user. A Caution identifies conditions
and procedures that can cause damage to the Product or
the equipment under test.
Symbols used on the Product and in this manual are
explained in Table 1.
To ensure safe operation of the Product, obey all
instructions and warnings contained in this manual.
Ex Safety Information
Note
Go to www.ecom-ex.com or www.fluke.com
download the EU Declaration of Conformity and
Ex certificate for this product. You can also order
them from Fluke.
This manual contains information and safety regulations
that must be followed for safe, reliable operation of the
Product in hazardous areas under the described
conditions. Failure to follow the information and
instructions can have dangerous consequences, or may
contravene applicable legislation.
Read this manual before you use the Product.
If there is a question (because of translation and/or
printing errors), refer to the English manual.

True-rms Digital Multimeter
Ex Safety Information
3
XW Warning
To prevent electric shock or personal injury
while in Ex-HAZARDOUS areas, follow these
guidelines:
•Do not open the Product while in an
Ex-hazardous area.
•Change the Product’s batteries only
outside Ex-hazardous areas.
•Do not take spare batteries into
Ex-hazardous areas.
•Use only type-approved batteries in the
Product. See item 5.1 in the Safety
Information for a list of approved
batteries.
•Do not replace fuses while in an
Ex-hazardous area.
•Use only fuses approved for
Ex-hazardous areas in this Product. See
item 5.3 in the Safety Information for a
list of approved fuses.
•Use the Product only when the specified
connection values are met.
•After you use the Product on a non-i.s.
protected circuit, wait 3 minutes before
you take the Product into an
Ex-hazardous area.
•The Product must be completely and
securely fitted in the red holster while it
is in an Ex-hazardous area.
•Use only approved accessories with this
Product in Ex-hazardous areas.
•Do not use the Product in aggressive
acidic or alkaline solutions. For
applications requiring Group I
equipment, avoid permanent contact of
the Product with oil, hydraulic fluid, or
grease.
•Do not use the Product in zones 0, 20,
21, or 22. Measurements on intrinsically
safe connections that go into these
zones are permitted, if the connection
values are met.

28 II Ex
Getting Started Manual
4
XW Warning
To prevent personal injury in mining
hazardous areas:
•Avoid extreme mechanical burdens. The
Product can withstand impacts with an
energy of seven joules at -20 °C.
•Do not allow the Product to come in
permanent contact with oil, hydraulic
fluid, or grease.
•Do not install the Product in a fixed
installation.
XW Warning
To prevent possible electrical shock, fire, or
personal injury in ALL areas of operation:
•Read all safety Information before you
use the Product.
•Comply with local and national safety
codes. Use personal protective
equipment (approved rubber gloves, face
protection, and flame-resistant clothes)
to prevent shock and arc blast injury
where hazardous live conductors are
exposed
•See the Ex Safety Information section for
additional warnings on Product use in
hazardous areas.
•Use the Product only as specified, or the
protection supplied by the Product can
be compromised.
•Do not use the Product in damp or wet
environments.
•Do not exceed the Measurement
Category (CAT) rating of the lowest rated
individual component of a Product,
probe, or accessory.

True-rms Digital Multimeter
Ex Safety Information
5
•Examine the case before you use the
Product. Look for cracks or missing
plastic. Carefully look at the insulation
around the terminals.
•Do not use test leads if they are
damaged. Examine the test leads for
damaged insulation, exposed metal, or if
the wear indicator shows. Check test
lead continuity.
•Do not work alone.
•Do not touch voltages >30 V ac rms, 42 V
ac peak, or 60 V dc.
•Use only correct measurement category
(CAT), voltage, and amperage rated
probes, test leads, and adapters for the
measurement.
•Remove all probes, test leads, and
accessories that are not necessary for
the measurement.
•Keep fingers behind the finger guards on
the probes.
•Limit operation to the specified
measurement category, voltage, or
amperage ratings.
•Measure a known voltage first to make
sure the Product operates correctly.
•Measure for hazardous voltage without
the Low-Pass Filter.
•Do not apply more than the rated
voltage, between the terminals or
between each terminal and earth ground.
•Do not touch the probes to a voltage
source when the test leads are
connected to the current terminals.
•Connect the common test lead before
the live test lead and remove the live test
lead before the common test lead.
•Replace the batteries when the low
battery indicator shows to prevent
incorrect measurements.
•The battery door must be closed and
locked before you operate the Product.
•Do not use the Product if it operates
incorrectly.
•Do not use and disable the Product if it
is damaged.

28 II Ex
Getting Started Manual
6
WCaution
To prevent possible damage to the Product
or to the equipment under test, follow these
guidelines:
•Disconnect circuit power and discharge
all high-voltage capacitors before testing
resistance, continuity, diodes, or
capacitance.
•Use the proper terminals, function, and
range for all measurements.
•Before measuring current, check the
fuses in the Product. (See Fuse Test.)
Errors and Load Restrictions
If there is a question that the safety or integrity of this
Product is compromised, remove it from operation and
the Ex-hazardous areas immediately. Also, do whatever
is necessary to prevent Product operation by others until
the Product is examined by an ecom certified technician.
It is recommended that you send the Product to the
manufacturer to be examined.
Because the safety and reliability of the Product can be at
risk, do not operate the Product if:
•Visible damage is found in the housing of the
Product.
•The Product has had an excessive load put on it for
which it is not designed.
•The Product was not stored correctly.
•The Product has sustained damage in transit.
•Illegible inscriptions or lettering shows on the
Product.
•A Product malfunction occurs.
•Obvious measurement inaccuracies occur.
•Measurements/simulations are no longer possible
with the Product.
•Permitted tolerances or threshold values were
exceeded.