Step by Step Procedures
Note:
The 623 incorporates a differential manometer.
This means when a single hose is connected to
the (+) port and pressure is applied, the 623 will
read positive pressure. If a single hose is con-
nected to the (-) port and pressure is applied,
the 623 will read a negative pressure. If both
ports are connected to a pressure, the 623 will
read the difference (P1 - P2) between the two.
When performing single pressure measurments
(non-differential) use the positive port and leave
the negative port open.
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