Product Description 2.1 General The smart 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  The LCD can be checked and the buttons can be operated without opening the cover which allows use of various functions of the positioner such as parameter adjustment in explosive gas atmosphere. User will easily understand the method of using 4 buttons because it work same in all mode 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.  Variable orifice can be used even to minimize the hunting occurrence and optimize operating conditions.  Various information about positioner can be processed by HART 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 18 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 ambient 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-3450).  Maintenance of the positioner is easy because of modularized inner structure.  SIL2 certified.(For more information, see SIL Safety Instruction on homepage

Mengchuan Instrument Co., Ltd. is located in Liushi Town, Yueqing City, Wenzhou, Zhejiang Province, surrounded by the beautiful world natural and cultural heritage - Yandang Mountain! It is mainly engaged in 2000 differential pressure gauge, red oil differential pressure gauge, pressure differential pressure transmitter, liquid level transmitter, diaphragm pressure gauge, shockproof pressure gauge, electric contact pressure gauge, stainless steel pressure gauge, precision pressure gauge, micro pressure capsule gauge, floating ball liquid level gauge, floating ball switch, liquid level controller, intelligent energy gauge, light column gauge and other products. The products are widely used in machinery and civil industries such as plastics, food, printing, chemical industry, petroleum, medical treatment, oven, light textile, printing and dyeing, air conditioning, family and so on.

The company adheres to the business philosophy of "customer first, forge ahead" and adheres to the principle of "customer first" to provide our customers with high-quality services. Welcome!