Specifications

10/31/02 Tech-304/DWO 14195 Page 3 of 39
Section 1- Introduction
1.1 Description of ICoT Positioner
The ICoT Smart Valve Positioner is an
electro-pneumatic servo system that
continuously controls the position of a
valve based on a 4 to 20 mA input sig-
nal. The ICoT is an instrument that
derives its power directly from a control
systems current loop. The instrument
senses valve position via a non-contact
Hall effect sensor and controls valve
position through a current to pressure
transducer.
The ICoT is available in two versions,
HART
®
and non-HART. The non-HART
version allows calibration of the instru-
ment through an on board keypad. The
HART
®
version allows calibration and
access to on-line diagnostic information
via Rosemount 275 hand-held terminal
or through software.
The positioner has a local liquid crystal
display which indicates valve position
and set-point in percentage open. It also
indicates whether the positioner is in cal-
ibration mode.
The ICoT has the capability to monitor operation. If a failure condition occurs, an
error message is displayed on the local liquid crystal display.
There are several accessories that can be integrally supplied with the ICoT.
Among these are a 4 to 20 mA analog output, hermetically sealed non-contact
switches and a fugitive emissions monitor.