Meriam M1 – Series Digital Manometer - Manual (Page 16)

M1 Series - DM Instruction Manual 9R000034-IR
E.O. 6409 JAN 2008
www.meriam.com
Page 16 of 17
User Connections
Connection: 1/8” female NPT, 316SS. The pressure connections
(P1 and P2) are marked on top of the keypad as shown on page 1.
“D” or Differential models have 2 used pressure ports. P1 is the
high pressure connection and P2 is the low pressure connection (as
shown below).
“G” Gauge and “A” Absolute models have one used pressure port,
P1. P2 is used to vent enclosure/sensor to atmosphere.
WARNING Connection to the incorrect pressure port may
cause damage to the pressure sensor. Once this sort of damage
occurs, the unit must be returned to the factory for sensor
replacement.
WARNING
User must use bulkhead fitting hex surface when
attaching user’s 1/8” NPT fitting. No torque can be applied to
bulkhead fitting with respect to plastic enclosure.
Barometric Pressure
or
Atmospheric Pressure
Absolute
Pressure
Absolute Zero
A
B
Gauge
Vacuum
+
-
Differential