Max Machinery EX295 Instructions D'installation page 2

Installation Instructions — Hazardous Locations
Applies only to Max Model EX295 and EX296 Transmitters with explosion proof certification.
These transmitters provide protection via a flame proof housing and through current limiting to the circuit board: Must wire with a
class 2 power supply (See table for loads page 2).
Meets US and Canadian Haz-Loc classifications, Class I, Div 1, Groups C and D, Tx
As well as ATEX/IECEx II 2 G Ex db IIB Tx Gb
Certification 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 flow meter screw the transmitter onto the exterior threads on top of the flow 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 finding 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 flush 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 fitting 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.
Removal from Flow Meter
Note: the transmitter does not need to be removed from the flow meter for any field servicing or adjustments. Normally, the flow
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 finding 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 certified 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 flameproof specifications.
About Explosion proof installations
For the Model EX295 and EX296 to fully adhere to the HazLoc certifications, 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 certified for use in hazardous
locations require the use of a 1/2" NPT hazardous location rated conduit fitting. 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 fittings and the wiring must
be an approved armored cable. (For detailed information on the joint constructions used to achieve a flame proof housing, please
contact Max Machinery.)
Max Machinery, Inc.
maxmachinery.com
P: 707.433.2662
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