11
Start
measurement
with
START/HOLD
button.
3
2
1
4
5
Insert single-
pipe counter
cap and
tighten.
Printout of initial
pressure
6
10
7
Switch on
instrument.
Ensure
connection is
correct.
Connect
pressure drop
set and
testo 312.
Freeze reading
with START/HOLD
Audible signal
after 1 min
8
9
Prints reading
Determines Δp
Build up test
pressure.
Use slide rule
to determine
what measure
to take
Measurement example: testo 312-2/-3
Service ability test
45
Carry out function test! Gas should not
get into the instrument when carrying
out measurements on gas pipes.
Pressure drop
The complete measuring system
(instrument, probe, hoses and
connections) should be checked for a
drop in pressure e.g. using pressure
drop test set by attaching the single-
valve stop.
Checking if fit for use
The pipe is pumped with air up to the
respective test pressure and the drop in
pressure in one minute is measured.
w ww . . co m
information@itm.com1.800.561.8187
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