Explosionproof I/P Option; Nema 4X Option; Application; Features - ABB AV1 Operating Instructions Manual

Explosionproof I/P Option

NEMA 4X Option

APPLICATION

FEATURES

Figures 1-3 and 1-4 show that the large signal maximum air flow
for both the standard and performance series positioners is about
the same. The performance series positioners achieve maximum
flow capacity at a much smaller error signal.
NOTE: ABB does not recommend using a performance
series positioner on a small actuator, as it could cause
instability.
The Type AV27 positioner employs an explosionproof I/P con-
verter that is mounted to an adapter block manifold. The adapter
block manifold is bolted to the outside of the main positioner hous-
ing. The unit is a Type AV12 positioner with the electric to pneu-
matic (four to 20-milliamp to 20.7 to 103.4-kilopascal (3.0 to
15.0-pounds per square inch gage)) conversion occurring within
the externally mounted I/P converter.
The four to 20-milliamp input signal wires shall be connected
through an explosionproof conduit entrance on the I/P converter. If
no electrical connections are made within the main housing, the
entire positioner can be considered suitable for application in the
hazardous locations shown on the I/P label.
Refer to Figure 3-1 for the external and mounting dimensions of
the Type AV27 positioner.
The Type AV˘˘˘˘˘˘N positioner comes with a NEMA 4X housing.
To maintain the NEMA 4X classification, the positioner shall be
installed per drawing C258567 and suitable piping shall be
attached to the vent opening and vented in a manner to preclude
the entrance of water under pressure, as from a hose. Addition-
ally, the conduit connections shall be suitable for a NEMA 4X rat-
ing.
The Type AV1 and Type AV2 Characterizable Pneumatic Position-
ers control the position of a pneumatic actuator.
Trouble-Free Operation. Proven pilot valve that is quickly
•
removable, provides less downtime, lower maintenance costs,
increased reliability and extended performance.
Compact Rugged Design. Die cast aluminum housing,
•
beam, spring arm, follower arm and 303 stainless steel pilot
INTRODUCTION
APPLICATION
1 - 3