AW Gear Meters RT-30EX - Manual (Page 6)

RT-30EX Flow Transmitter
Operation and Programming Manual
6
RT-30EX User Manual, Rev. 1.7 02/07/2012
Hazardous Area Installation Instructions
The RT-30EX unit is an explosion-proof flow transmitter with local display which may be used in Class 1,
Div 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. 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 to determine appropriate course of action.
Because the RT-30EX 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. Also, disconnect power before
loosening or adjusting the swivel collar on the hub adapter.
For proper installation, it is also necessary that the conduit entries are properly sealed. To maintain the
unit’s explosion-proof certification, anything threaded into the NPT conduit openings must engage by a
minimum of 5 full threads. If original units received from AW-Lake Company are versions which have
the sensor installed, this sensor will be properly installed with a minimum of 5 full threads of
engagement from the factory.
When an RT-30EX is installed into the flow meter with which it is to be used, it is also necessary to make
sure there is a minimum of 5 full threads of engagement between the meter and RT-30EX unit.
When wiring the unit, please make sure to observe any local codes that may be required. A common
requirement is to have a conduit seal within 18 inches of the unit. Also, the unit may be used in a Class
I, Div. II area, but must still be installed according to Class I, Div I standards. Make sure units are
powered by a Class 2 power supply for proper regulation.
Please note that the RT-30EX must be installed properly into a flow meter before power is applied.
Warning!
Warning!
Warning!
Figure 1: Hazardous area certification tag