8
IE-COM-C3121P-1
APPENDIX A
The probe for measuring the moisture of compressed air should be placed directly on the
pressure pipelines to achieve higher measurement accuracy and fast response times. But they are
cases where such placement is not possible. The reason is the high air speed, high temperature,
high pollution, small diameter pipes, etc. Such situation can be solved by placing the probe into the
flow measuring chamber. The picture shows the basic layout of the sampling system with
chamber SH- PP.
1 ….sampling
2 ….closing valve
3 ….probe
4 ….flow chamber SH-PP
5 ….closing valve
6 ….outlet tube
sampling (1)
- end of the tube placed in the centre of pressure pipelines (distribution of moisture in
the pipe cross-section is not homogeneous). To achieve fast response times to shorten the
length of the sample tubes to a minimum (few meters).
closing valve (2) -
allows access to the sample system without interrupting the main line
closing valve (5) -
the sample flow is regulated by this valve. Measurement accuracy is typically
not affected by the sample flow rate, but at low speeds, increasing response time.
outlet tube (6) -
if the measured sample of air is released into the atmosphere, select the length of
the outlet tube of 1.5 m (recommended for tube diameter 6mm). The reason is to ensure the
accuracy of the sample in the flow chamber and avoid back diffusion of moisture from the
ambient air.
.
That basic structure of sampling system can be supplemented with filters, coolers, flow
measurement, pressure measurement, etc. For the accurate operation of sampling system is
important to ensure perfect tightness of all connections and
to use corrosion-resistant materials. Tube inclination is
chosen so as to avoid the accumulation of fluid in the
system.
Technical specification – flow chamber SH-PP
Material of flow chamber:
stainless
steel
(DIN 1.4301)
Inlet and outlet connection:
G1/8
Probe connection:
G1/2
Sample flow rate:
0.1 to 3 l/min
Operating pressure:
up to 25 bar
Weight:
580 g
Note:
Screw-coupling not included
