Specifications

10/31/02 Tech-304/DWO 14195 Page 6 of 39
Remote Position Control
Since valve position feedback to the ICoT positioner
is accomplished by non-contacting means, the ICoT
has the unique ability to be mounted remotely (up to a
distance of 50 feet) from the device it is controlling. In
the event the control valve is located in either a high
vibration or extremely corrosive environment, the
non-contact position feedback feature allows for iso-
lated placement of the positioner.
Local LCD
The ICoT positioner is supplied with HART
®
interface or a 3-button keypad interface. Both
versions are furnished with a 4-digit,.5” tall LCD, and allow for automated calibration of the
positioner. The local LCD provides a multitude of onsite diagnostic information. While the
valve is being controlled by the positioner, and the er-
ror signal is not zero, the displayed information will al-
ternate between setpoint and position as a percentage.
Each value is displayed for a period of two seconds.
Once the setpoint and valve position agree to within
less than 0.5%, the display will only show position. The range of values displayed are from
0.0% to 100.0%. Displayed resolution is in 0.1% increments, however, internal calculations
are maintained at higher precision.
On-Board Sensors
The ICoT positioner has the capability to monitor its
operation. If an error or failure condition occurs, it will
be displayed on the local LCD, or if the positioner is
supplied with a HART
®
interface, the error codes will be
displayed on a hand held terminal or a PC mainten-
ance station. Note: Error codes are denoted on a label affixed to the LCD flip-up protective
cover.
Local Keypad
All positioners are provided with a 3-button membrane key-
pad.The keypad is provided for zero and span adjustments, as
well as valve characterization and gain adjustments.
Intelligent Calibration (HART
®
Protocol)
The ICoT positioner responds to HART
®
commands for seeking the “valve closed” position
and assigns an instrument signal of 4 mA to this position. The counterpart of the operation
for a full open state is implemented next by setting the span value. Action reversal is also
configured. Additionally, provisions are made for altering internal servo loop tuning via the
HART
®
link. In this manner, positioner performance may be optimized with a wide combina-
tion of valves and actuators.