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an ISO 9001:2008 certified company
Installation Instructions — Hazardous Locations
Applies only to Max Model EX295 and EX296 Transmitters with explosion proof certication.
These transmitters provide protection via a ame proof housing and through current limiting to the circuit board:
Must wire with a class 2 power supply (See table for loads page 3).
Meets US and Canadian Haz-Loc classications, Class I, Div 1, Groups C and D, Tx
As well as ATEX/IECEx II 2 G Ex d IIB Tx Gb
Certication numbers Demko 11 ATEX 1013058X and IECEx UL 10.0048X
Mechanical Installation
The outer housing freely rotates to align the conduit hole with your electrical connection point. If the transmitter is
already attached to the meter skip to step 5:
1. To attach the transmitter to the ow meter, apply a small amount of low strength thread adhesive, such as Loctite™,
on the threads and screw the transmitter onto the exterior threads on top of the ow meter.
2. Locate the locking set screw below the conduit hole and using a 3/32" hex wrench remove it. Rotate the outer housing
clockwise until the screw hole lines up with a hole in the inner housing. (Inserting an Allen key into the threaded hole
while rotating the housing can help in nding the point of alignment.) Now re-insert the set screw and hand-tighten it to
lock the inner and outer housing together.
3. Finish tightening the transmitter onto the meter by applying a torque of 2 to 5 ft.-lb. (2.7 to 6.78 N-m).
4. Now back out the locking set screw until it is ush with the surface of the transmitter.
5. The housing can now be rotated to align the conduit port in the desired direction.
6. To remove the lid for wiring, remove the safety screw at the edge of the lid and then remove the cap using a 3/8”
socket drive.
7. Install conduit. Within 18” of the housing install a conduit stop and fully seal with potting compound.
8. Connect wires to terminal block as shown below, using 2 mm screw driver.
9. A case ground terminal is provided internally, but if grounded metallic conduit is not used, then one of the external
grounds below the conduit tting must be used. For metric- use either a 6 or 8 mm long stainless steel M5 x 8.0 bolt. For
inch measurement – use either a 1/4” or 5/16” long stainless steel #10-32 bolt.
10. Reattach cap and tighten to 40 in-lbs to seal enclosure. Install safety lock screw at the edge of the lid and hand
tighten.
EXInstallEnglish_001Q2.pdf • Rev2 • © 08/14/2013 Max Machinery, Inc. `
Page 2
33A
Healdsburg Avenue
Healdsburg,
CA 95448
T
+1 707. 433.2662
F
+1 707. 433.1818
Max Machinery, Inc.
maxmachinery.com
Removal from Flow Meter
Note: the transmitter does not need to be removed from the ow meter for any eld servicing or adjustments. Normally,
the ow meter and transmitter are shipped back to the factory for calibration as a unit.
1. Remove the locking screw at the edge of the lid and then remove the cap using a 3/8” socket drive.
2. Disconnect wires at the terminal block and remove wiring conduit from transmitter.
3. Locate the locking set screw below the conduit hole and remove it. Rotate the outer housing clockwise until the screw
hole lines up with a hole in the inner housing. (Inserting an Allen key into the threaded hole while rotating the housing
can help in nding the point of alignment.) Now re-insert the set screw and hand-tighten it. This will lock the inner and
outer housing together.
4. Unscrew the transmitter, using a strap wrench if necessary.
Moisture Protection
The housing is a liquid and vapor-tight enclosure certied to IP66. There is an O-ring seal at the lid of the housing — the
seal needs to be fully seated to provide moisture protection and achieve ameproof specications.
About Explosion proof installations
For the Model EX295 and EX296 to fully adhere to the HazLoc certications, the wiring must meet the appropriate
codes. (Use of a wire conduit does not make the installation explosion proof – read below.) The transmitters which are
certied for use in hazardous locations require the use of a 1/2” NPT hazardous location rated conduit tting. The
wiring conduit must be sealed with a conduit stop within 18” of the device. If you choose to use exposed cables, cable
seals must be used with sealing ttings and the wiring must be an approved armored cable. (For detailed information on
the joint constructions used to achieve a ame proof housing, please contact Max Machinery.)
Electrical Installation
The transmitter includes a wiring pigtail and 2 part connector - use of the pigtail is optional and direct wiring to the
PCA is recommended if the circuit board is accessible. Use wiring that is between 20 and 28 gauge and rated to at least
5°C above the maximum ambient temperature, and rated to at least 80% of the maximum uid temperature. Cut back
the cable bundles’ outer sheath several inches to make it easier to coil the wire loop inside the housing. The pigtail
connector’s terminals correspond to the terminal block on the PCA. Refer to the diagram below for wire number and
functions.
Pulse Output
Wiring
Power * V+ Power V+ 1 Case Case
Common Com Common Com 2 5V 5V
Signal
Output
(Quad only) PhB Signal Output (-) Ret 4 Rb Rb
Case Ground Case Case Ground Case 5 Com Com
* Consult Electrical Requirements Table
EXInstallEnglish_001Q2.pdf • Rev2 • © 08/14/2013 Max Machinery, Inc. `
Pulse
PCB
Label
PhA Signal Output (+) Sig 3 Ra Ra
Analog Output
Wiring
Analog
PCB
Label
Wiring
Adaptor
Pin #
Two Part Transmitter Wiring
Ex-Proof Sender
(Example: EX29x-051-000)
Remote Receiver
(Example: EX296-x8x-xxx)
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an ISO 9001:2008 certified company
Electrical Requirements
The device must be powered with a Class 2 power supply. Electrical loads are specic to model number’s:
Part #’s Transmitter Type
EX29x-0xx-0xx Pulse Output Transmitter 5-28Vdc 40mA Single Line 0-5V 10mA (500 ohm pulldown or greater)
EX29x-1xx-0xx Quadrature Output Transmitter 5-28Vdc 50mA 2 Lines 0-5V 10mA each (500 ohm pulldown or greater)
EX29x-2xx-0xx mA Output Transmitter (24Vdc) 24-28Vdc 50mA Isolated current loop, max 500 ohms in line, 12Vdc max
EX29x-2xx-1xx mA Output Transmitter (12Vdc) 12-15Vdc 100mA Isolated current loop, max 500 ohms in line, 12Vdc max
EX29x-3xx-0xx V Output Transmitter (24Vdc) 24-28Vdc 50mA Isolated voltage loop, min 1000 ohms across line, 12Vdc
EX29x-3xx-1xx V Output Transmitter (12Vdc) 12-15Vdc 100mA Isolated voltage loop, min 1000 ohms across line, 12Vdc
EX29x-6xx-0xx
Level Shifter Pulse Output
Transmitter
Electrical Input
Requirements
5-28Vdc 30mA Single line, current sinking, max 28Vdc, max 25mA
Output Electrical Requirements
Temperature Classication
Temperature class is a function of uid temperature used in the meter and ambient temperature. For hot uids, meter
must be insulated and transmitter must be left exposed. All transmitters are rated to operate within the BLUE region,
but only the remote sender unit variants (EX29x-x5x-xxx) can operate up to the maximum temperatures shown in the
chart. Consult factory for installation details when operating near temperature limits.
Temperature class chart for all explosion proof variants:
100-
90 -
80-
75-
60-
40-
20-
Ambient Temperature °C
-25
0
Fluid Temperature °C
Note: Consult factory to determine the functional temperature limit of your transmitter variant. Temperature class
ratings do not correspond with the continuous duty area for the electronics within the transmitter. A complete
description of your transmitter may be found on the Max Machinery web site (www.maxmachinery.com). Individual
specication sheets and product family manuals are also available for viewing or downloading.
100
90
75
T6 T5 T4
75 90 130
20
40
60
80
100
120
130
EXInstallEnglish_001Q2.pdf • Rev2 • © 08/14/2013 Max Machinery, Inc. `
Page 4
33A
Healdsburg Avenue
Healdsburg,
CA 95448
T
+1 707. 433.2662
F
+1 707. 433.1818
Max Machinery, Inc.
maxmachinery.com
EC Declaration of Conformity
We, Max Machinery Inc. declare as manufacturer under our sole responsibility that the product series EX295/EX296
Explosion Proof Flow Transmitter is in conformity with the provisions of the European Community Directives as shown
below.
Applicable Series: Part numbers of the format EX295-xx1-x00 and EX296-xx1-x00 where ‘x’ does not affect conformity
to the standards.
Low Voltage Directive 2006/95/EC
EMC Directive 2004/108/EC
EN 61000-6-2:2005 Electromagnetic Immunity
EN 61000-6-4:2007 Electromagnetic Emission
ATEX Directive 94/9/EC designed and manufactured in accordance with Annex II of the Atex Directive
EN 60079-0:2009 Explosive atmospheres general requirements
(Note: no routine verication and tests are required by clause 27)
EN 60079-1:2007 Protection by ameproof enclosures type d”
Designation: 0539 II 2 G Ex d IIB Tx Gb
EC Type examination certicate DEMKO 11 ATEX 1013058X Rev 1 provided by
UL International DEMKO A/S NB Number: 0539
P.O. Box 514, Lyskaer 8, DK-2730 Herlev, Denmark
Product quality assurance notication #11 ATEX Q1116140 provided by UL Demko
Production control done to ISO 9001:2008, certicate #C2010-01864
May 24, 2011
Bryan R. Snyder Max Machinery Inc.
Engineering Manager 33A Healdsburg Ave.
Healdsburg, CA USA
(707) 433-2662
EXInstallEnglish_001Q2.pdf • Rev2 • © 08/14/2013 Max Machinery, Inc. `
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