ONICON F-5100 Insertion - Manual (Page 15)

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F-5100 Insertion Thermal Mass Flow Meter Manual 05/15 - 0663-20 / 18333 Page 15
3.3 INSTALLING THE FLOW SENSOR
Begin by calculating the effort that will be required to hold the sensor. Establish adequate footing
for this task, taking extra care when working from a ladder or platform. Use the following
formula:
E=0.2 x P Where: E = effort in pounds
P = system pressure in pounds per square inch
Example: In a 50 PSI system, 10 pounds of force is required to insert the sensor into the pipe.
WARNING
SYSTEM MAY BE UNDER HIGH PRESSURE. When inserting, removing or adjusting the sensor
position, be sure to hold the enclosure firmly by hand before SLOWLY loosening the
compression fitting. Failure to do this will allow the pressure to suddenly and rapidly force the
sensor from the pipe causing serious injury. The hand effort required to hold the sensor will be 0.2
times the pipe pressure.
!
WARNING
Remove all sources of ignition (i.e. open flame, welding equipment, a lit cigarette, etc.) from the
area prior to installing, removing or adjusting the flow sensor when working with combustible
gases.
!
3.3.1 Determining the Insertion Depth, Inserting the Sensor and Tightening the
Compression Fitting
WARNING
The following instructions assume that the pipe is pressurized. Whenever the ball valve is open;
a firm grip must be maintained on the sensor at all times until the insertion depth is set and the
compression fitting is properly tightened.
!
WARNING
Do not attempt to insert the sensor into a pipe pressurized to greater than 200 PSIG. For pipes
pressurized above 200 PSIG isolate flow and relieve pressure in the pipe before attempting to
install the sensor.
!
The insertion depth is based on the inside diameter of the pipe into which the sensor is
installed. When the sensor is properly installed, the flow sensor is positioned in the center
of the pipe.
For sensors installed in pipes with a nominal diameter ≤ 6 inches, the reference point for
the insertion depth measurement is the inside wall of the pipe directly opposite from the
insertion point. For sensors installed in pipes with a nominal diameter > 6 inches, a depth
gage is provided. See Appendix A-2 for instructions on the use of the insertion depth gage.