Dwyer DPM - Manual (Page 15)

Particulate Monitoring Systems
Installation & Operating Manual
Document No. 210-1003-M Page 8 ©2007
Extreme vibration should be avoided.
_ ATMOSPHERIC AND ELECTRICAL SHIELDING OF SENSOR
• It is essential for the pipe/duct to provide an electrical (Faraday) shield for
the sensor. The pipe/duct or stack should be metal with a high quality earth
ground. Consult the factory for non-conductive pipes/ducts such as plastic
or fiberglass. (Small in-line sensors for small tubing provide their own
section of metal pipe, which also must be grounded).
• When the sensor is placed in a stack/duct choose a location away from
atmosphere so wind driven atmospheric particulate or rain does not flow
over the sensor and so external electrical noise cannot affect operation.
• Do not place the sensor where the pipe/duct is corroded or cracked which
may allow water droplets to create signals as they flow by.
4.2 Mounting
The following types of process mounts are available for the standard probe style sensors:
NPT, Quick-Clamp and ANSI flange.
Inline sensors for small tubing are supplied with swage lock or other tube connections to mount inline
with metal or plastic tubing.
Installation drawings of each mounting type can be found in the appendix.
HAZARDOUS AREA SENSOR GROUNDING
• For hazardous area applications an external sensor earth ground cable is
required to maintain sensor grounding during installation and maintenance.
• The ground cable must remain attached when the sensor is temporarily
removed from the process – do not disconnect the ground cable.
• Leave sufficient ground cable service loop for easy removal of the sensor
from the process.
IMPORTANT