AW Gear Meters RT-Ex15-Ex - Manual (Page 4)

AW-Lake Company 8809 Industrial Drive, Franksville, WI 53126  web: www.awgearmeters.com
 Tel: 262-884-9800  Fax: 262-884-9810  Email: [email protected]
RT-Ex15-Ex manual rev 6.13.11.docx Revision 3.3.10
4
Special installation instruction for use in hazardous area environments
Figure 1. RT-Ex15-Ex name plate
The RT-Ex15-Ex unit is an explosion proof local display which may be used in Class I, Division 1 locations. Above
is a sample of the name plate that should be clearly attached to each unit. Please make sure this name plate is on the
unit and that the information matches what is shown above, prior to installation. Depending on whether the unit is
equipped with a swivel union and/or installed with either a 303ss or 316ss flowmeter, the tag may not include the
Type 4X rating. If either the name plate is not on the unit or the unit name plate does not match what is shown
above, please notify AW-Lake Company and determine what needs to be done.
Because the RT-Ex15-Ex uses an explosion proof enclosure for its area protection, power must be removed from the
unit before the covers are removed while in a hazardous area.
For proper installation, it is also necessary that the conduit entries are properly sealed. To maintain the units
explosion proof certification, anything threaded into the NPT conduit openings must engage by a minimum of 5 full
threads. Original units received from AW-Lake Company will have a sensor installed. This item is properly
installed with a minimum of 5 full threads of engagement and should not be tampered with. The unit also comes
with a blind plug. It is the customer’s responsibility to make sure that any blind plugs used are properly installed
with a minimum of 5 full threads of engagement. NOTE: It is strongly suggested to use anti-seize grease on threads
prior to installation to avoid galling.
When installing the RT-Ex15-Ex into an AW spur gear meter, in order to maintain the unit’s explosion proof rating,
make sure the 3/8” NPT male portion of the sensor is engaged by a minimum of 5 threads into the flowmeter.
NOTE: It is strongly suggested to use anti-seize grease on threads prior to installation to avoid galling.
When wiring the unit, please make sure to observe any national or local codes that may be required. An explosion-
proof seal is required within 18 inches (450mm) of the enclosure. If installed in a Class I, Division 2 area, an
explosion-proof seal is still required within 18 inches (450mm) of the enclosure according to Class I, Division 1
installation requirements. Make sure units are powered by a Class 2 power supply for proper regulation.
Removal of the external housing ground terminal is not permitted for safety reasons. Please make sure to follow
local electrical code practices when installing equipment in hazardous areas.