Function Test Of The Soot Test Pump; Measuring Head And Probe; Tightness Of The Pump - Wohler RP 72 Operating Manual

Function test of the Soot Test Pump

4 Function test of the Soot Test Pump
4.1

Measuring head and probe

ATTENTION!
The measuring head must be clean.
Fig. 2: Measuring heads
4.2

Tightness of the pump

The soot test can only be done properly, if the pump is tight. How to perform the tight-
ness test:
Bend and squeeze the hose with inserted piston and then pull the piston right up.
After about 3 seconds the piston should jump right down into the pump when released.
Remove the piston (20) out of the pump once again.
The piston will bebound completely, if the pump is tight.
If this does not happen, check the items listed below.
Perfect valve rings in their right
positions:
The clamps on the side must hold the PVC part
and the aluminium part tightly together.
The water trap at the measuring head has to be
sealed off with an O-ring, this also applies to the
screwed-in sampling probe or the screwed-in
smoke tsting plug.
How to perform the function test:
• Remove the piston (20) out of the pump.
Hold the tip of the probe into water.
•
Press the piston (20) into the pump again.
•
During this procedure, no air bubbles should es-
cape from the tip of the probe.
The valve disc (13) should not be deformed and
should lie with its bulging side on the stainless
steel spring 11. Both parts should rest unrestricted
in the valve receiving means (23).
at the water catcher (6) at both plugs (O ring
•
5)
at the valve ring 15 (O ring 14)
•
at the valve receiving means (O ring 22)
•
EN
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