Dwyer DPM - Manual (Page 18)

Particulate Monitoring Systems
Installation & Operating Manual
Document No. 210-1003-M Page 11 ©2007
Sensor Test Port (Non-Hazardous Areas Only)
Location: A test port should be installed in a negative pressure location. It must be located upstream
of the sensor so particulate can flow very near and around the sensor. It should be located at least 3 ft
(1 m) upstream of the sensor and it should be located on the same side of the duct as the sensor so
particles can pass very near and around the sensor. If possible locate the test port at ground level.
Mounting: The test port is either screwed into a 1/8 inch NPT threaded hole, or welded in position.
(Note: A foot or so of tubing can be connected to the nipple to make it easy to draw particles out of a
container. Only a pinch of particulate at a time is needed for a response check.)
_ TEST PORT INSTALLATION
• Installation of a sensor test port enables checking the response to an actual
increase in particulate.
IMPORTANT