Max Machinery 290 Series Analog (295, 296 and G Series Transmitters) - Manual (Page 9)

9 IH 295-200-350 • rev. 6/2011 • ©2010-11 Max Machinery, Inc.
an ISO 9001:2008 certified company
Installation - 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).
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 d 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, apply a small amount of low strength thread adhesive,
such as Loctite™, on the threads and screw the transmitter into the threaded recess on top of the
flow meter.
2. 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 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 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 open the housing for wiring, remove the locking 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.
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 40in-lbs to seal enclosure. Install safety lock screw at the edge of the
lid and hand tighten.