Transducer Installation
Page 16
August 2019
DPP-UM-00256-EN-03
Probe Insertion
Before inserting the DP7 probe into the piping system, calculate the probe insertion depth Refer to the paragraphs that
follow and
for information regarding this process The variables required are:
• The overall probe length
• Pipe internal diameter (ID)
• Pipe wall thickness
• The length of the valve stack
• Amount of straight pipe diameters in the system
To Calculate Insertion Depth
Using this information and referring to
, proper insertion depth can be determined
• Measurement A — The typical depth that the DP7 probe tip is inserted into the piping system is 1/8 (12 5%) of the pipe
internal diameter
• Measurement B — Pipe wall thickness This information can be obtained from standard pipe wall charts (see
) or ideally can be measured using an ultrasonic wall thickness gauge
• Measurement C — Measure the distance that is going to be taken up by the pipe tap, nipple, full-flow ball valve and the
insertion fitting DP7 probes use 1-1/2 in NPT hardware and the insertion fitting is approximately 2-1/2 in in height
• Measurement D — The length of DP7 probe that protrudes from the insertion fitting after it is inserted to the proper
depth in the fluid stream
• Measurement E — This is the overall length of the probe measured from the black measurement tip to the top flange on
the probe
Measure and record the following linear dimensions
A
=
0 125 x Pipe OD
=
B
=
Pipe Wall Thickness
=
C
=
Seal Fitting to Pipe Wall
=
D
=
E - C - B - A
D
=
E
=
Probe Length
=
