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In order for the probe to be inserted at the right point within the stack, its distance from the boiler has to be twice
the diameter of the stack pipe itself or, if this is not possible, must comply with the boiler manufacturer’s
instructions.
In order to position the probe correctly, a reliable support must be provided by drilling a 13/16 mm hole in the
manifold (unless already present) and screwing in the positioning cone provided with the probe - in this way no air
is drawn from the outside during sampling.
The screw on the cone allows the probe to be stopped at the right measuring depth - this usually corresponds to
the centre of the exhaust pipe.
For greater positioning accuracy, the user may insert the probe gradually into the pipe until the highest
temperature is read. The exhaust pipe must be inspected before carrying out the test, so as to ensure that no
constrictions or losses are present in the piping or stack.
14.1.3 Simultaneous measurement of pressure, O
2
, pollutants
In order to measure simultaneously pressure, O
2
and pollutants levels as well as all the others calculated
parameters necessary to obtain the correct performance value, connect the instrument as follows:
INSERT ON THE
CONECTOR THE
BLACK CAP GI-
VEN WITH THE
PROBE.
Pin
Pout
* There are two types of pressure measure-
ments that can be made:
- Differential: measures the pressure loss
between the P- (Pin) input and P+ (Pout)
output of the valve.
- Gauge: measures the pressure of the
burner referenced to the external
pressure; in this case only the
measurement pipe P- (Pin) should be
connected.
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