Smart Positioner
YT-3700 / 3750
Product Manual
Ver. 1.03
7
2
Product Description
2.1
General
YT-3700 / 3750 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, PID Control, and HART Protocol
Communications.
2.2
Main Features and Functions
➢
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.
➢
When unexpected situation like momentary blackout happens, our positioner boot-time only take
0.5 second and this can minimize the travel of valve which consequentially increase the safety of
system.
➢
Positioner operates normally even there are sudden changes in supply pressure and / or high
vibration environment.
➢
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.
➢
Orifices can be installed even in the field to minimize the hunting occurrence and optimize
operating conditions.
➢
Various information about positioner can be processed by HART communication.
➢
Valve system becomes more stable by outputting analog feedback signal.
➢
Different valve characteristics can be adjusted
– Linear, Quick Open, Equal Percentage, and
User Set which user can make 5 or 21 points characterizations.
➢
Tight Shut
– Close and Shut - Open can be set.
➢
PID parameters can be adjusted in the field without any additional communicator.
➢
A/M switch can be used to direct supply air to the actuator or to manually operate the positioner
or valve without any signal.
➢
Split range 4~12mA or 12~20mA can be set.
➢
Operating temperature for positioners is -30 ~ 85
℃ or
-40 ~ 85
℃
(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-3750).
➢
Maintenance of the positioner is easy because of modularized inner structure.
➢
SIL2 certified.(For more information, see SIL Safety Instruction on homepage)
