TESTO 312 - Pre-test and Main Test Procedures

3
2
1
4
5
Insert single-
pipe counter
cap and
tighten.
Example
Manual printout
triggers an
automatic
printout after 10
minutes.
6
Pre-test / Main test
Measurement example: testo 312-2/-3
10
Switch on
instrument.
Start measurement
with START/HOLD
button.
Ensure
connection is
correct.
Connect
pressure drop
set and
testo 312.
Compare
printouts
OK/not OK
Build up test
pressure
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 connec-
tions) should be checked for a drop in
pressure e.g. using pressure drop test
set by attaching the single-valve stop.
Preliminary test
Pipes are checked, without fittings, with a
test pressure of 1 bar. This pressure should
not fall during the 10-minute duration of
the test.
Main test
Pipes are checked, with fittings, with a
test pressure of 110 mbar. This pressure
should not fall during the 10-minute
duration of the test. The measuring
instrument should be able to recognise
a drop in pressure of 0.1 mbar.
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