Smart Positioner
YT-2500 / 2550 / 2501 Series
Product manual
Ver. 1.04
7
2. Product Description
2.1
General
YT-2500 / 2550 / 2501 series Smart Valve Positioner accurately controls valve stroke in
response to an input signal of 4~20mA from the controller. Built-in micro-processor
optimizes the positioner
’s performance and provides unique functions such as
Auto-
Calibration, PD Control and HART Protocol Communications.
2.2
Main Features and Functions
When Input signal or Supply air pressure (below 0.1 MPa) fails, Positioner keeps the
current position of the valve stroke without any additional device. (Fail Freeze option)
LCD display enables users to monitor the positioner status.
User will easily understand the method of using 4 buttons because it work same in all
versions of firmware interfaces.
Positioner operates normally even there are sudden changes in supply pressure and / or
high vibration environment.
YT-2501 is stronger on high temperature and vibration environment because it is
separated into feedback sensor and positioner.
The method of Auto Calibration is very simple.
As an advantage of having very low air consumption, It could greatly reduce operating
costs in large-scale plants.
It is compatible with most of controllers.
Variable orifices can be used to minimize the hunting occurrence and optimize operating
conditions.
Various information about positioner can be processed by HART or Foundation Fieldbus
communication. (option)
Valve system becomes more stable by outputting analog feedback signal.
Different valve characteristics can be adjusted
– Linear, Quick Open, Equal Percentage,
and Custom which user can make 16 points characterizations.
Tight Shut
– Close and Shut - Open can be set.
PD parameters can be adjusted in the field without any additional communicator.
Split range 4~12mA or 12~20mA can be set.
Operating temperature for sensor module of YT-2501 series is -40 ~ 120
℃.
Operating temperature for positioners is -30 ~ 80
℃
(Please check certified explosion
proof temperature)
Hand calibration function can set Zero point or End point manually.
It has IP66 protection grade.
Epoxy polyester powder coating resists the corrosion process. (except YT-2550)
Maintenance of the positioner is easy because of modularized inner structure.
