Meriam M2 – Series Smart Manometer - Manual (Page 36)

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GI, CI and AI models use only the P1 pressure port. The
unused P2 port vents the enclosure to atmosphere (a vent
plug is factory installed in the P2 port).
Connection to the incorrect pressure
port on DN or DI differential pressure
modules may cause damage to the pressure sensor. See
the Specifications section of this manual for over pressure
limits. If over pressure damage occurs, the unit must be
returned to the factory for sensor replacement.
User must use a wrench on the
pressure manifold when installing
user’s 1/8” NPT fitting. Do not tighten the fitting without
using a wrench on the pressure manifold. Failure to use a
wrench on the manifold will damage the plastic enclosure
and void warranty No torque should be applied to the
manifold with respect to plastic enclosure.
Pressure Reference Chart
Gauge Absolute
Pressur
e
Barometric
(Atmospheric)
Pressure
Absolute Zero
Differential
Barometric
Vacuum
Compound
Pressure