Ytc YT-2500 SERIES User manual

SMART POSITIONER PRODUCT MANUAL
YT-2500 / 2550 / 2501 SERIES
VERSION 1.04

Smart Positioner
YT-2500 / 2550 / 2501 Series Product manual
Ver. 1.04 2
Contents
1. Introduction ...................................................................................................................................5
1.1 General Information for the users ...........................................................................................5
1.2 Manufacturer Warranty ...........................................................................................................5
1.3 Explosion Proof Warning (Only for Intrinsic safety type positioners)......................................6
2. Product Description......................................................................................................................7
2.1 General....................................................................................................................................7
2.2 Main Features and Functions..................................................................................................7
2.3 Label Description ....................................................................................................................8
2.4 Product Number......................................................................................................................9
2.4.1 YT-2500 / 2550 series follows suffix symbols as follows................................................9
2.4.2 YT-2501 series follows suffix symbols as follows. ........................................................10
2.5 Product Specification ............................................................................................................11
2.5.1 YT-2500 / 2550 Specification........................................................................................11
2.5.2 YT-2501 Specification...................................................................................................12
2.6 Certifications..........................................................................................................................13
2.7 Parts and Assembly ..............................................................................................................14
2.8 Product Dimension................................................................................................................16
2.8.1 YT-2500.........................................................................................................................16
2.8.2 YT-2550.........................................................................................................................17
2.8.3 YT-2501.........................................................................................................................17
3. Installation ...................................................................................................................................18
3.1 Safety....................................................................................................................................18
3.2 Tools for installation ..............................................................................................................18
3.3 Linear positioner Installation .................................................................................................18
3.3.1 Safety ............................................................................................................................19
3.3.2 Linear positioner Installation Steps...............................................................................19
3.4 Rotary positioner Installation.................................................................................................23
3.4.1 YT-2500 / 2550R Components .....................................................................................23
3.4.2 YT-2501R remote sensor Components ........................................................................23
3.4.3 Rotary Bracket information (Only YT-2500 / 2550).......................................................24
3.4.4 Rotary positioner Installation Steps...............................................................................25
4. Connection - Air ..........................................................................................................................27
4.1 Safety....................................................................................................................................27
4.2 Supply Pressure Condition....................................................................................................27
4.3 Piping Condition....................................................................................................................27
4.4 Connection –Piping with actuator ........................................................................................28
4.4.1 Single acting actuator....................................................................................................28
4.4.2 Double acting actuator ..................................................................................................29

Smart Positioner
YT-2500 / 2550 / 2501 Series Product manual
Ver. 1.04 3
5. Connection –Power....................................................................................................................30
5.1 Safety....................................................................................................................................30
5.2 Connection............................................................................................................................30
5.3 Ground ..................................................................................................................................31
6. Adjustments.................................................................................................................................32
6.1 Limit Switch Adjustment........................................................................................................32
6.2 Variable Orifice Adjustment...................................................................................................33
7. Optional Sub-PCB Installment...................................................................................................34
7.1 Installation steps ...................................................................................................................34
8. Auto Calibration and PCB Operation........................................................................................35
8.1 Warning.................................................................................................................................35
8.2 Button Description.................................................................................................................35
8.3 Run Mode (RUN) ..................................................................................................................36
8.4 Auto Calibration mode (AUTO CAL).....................................................................................36
8.4.1 AUTO1 Calibration (AUTO1).........................................................................................37
8.4.2 AUTO2 Calibration (AUTO2).........................................................................................37
8.4.3 AUTO3 Calibration (AUTO3).........................................................................................37
8.5 Manual Mode (MANUAL)......................................................................................................38
8.6 Parameter Mode (PARAM)...................................................................................................38
8.6.1 Dead-Zone (dEAdZONE)..............................................................................................38
8.6.2 P1 Value (KP1)..............................................................................................................39
8.6.3 D1 Value (Kd1)..............................................................................................................39
8.6.4 P2 (KP2) and D2 (Kd2) values......................................................................................39
8.6.5 P_ (KP_) and D_ (Kd_) Values .....................................................................................39
8.6.6 PT1 (PT1) and PT2 (PT2) Values.................................................................................40
8.6.7 Period T (PERIOD T) ....................................................................................................40
8.6.8 Auto DZ (AUTO dZ).......................................................................................................40
8.7 Hand Calibration Mode (HAND CAL)....................................................................................41
8.7.1 Zero-Point (PV_ZERO) and End-Point (PV_END) for Valves ......................................41
8.7.2 Zero-Point (TR_ZERO) and End-Point (TR_END) for Transmitter...............................42
8.7.3 End-Point Ratio for Valve (PE TRIM)............................................................................43
8.7.4 Normal / Reverse Feedback Signal (TR NORM / REVS).............................................43
8.7.5 Normal / Reverse HART Signal (HT NORM / REVS) ...................................................43
8.8 Valve Mode (VALVE) ............................................................................................................44
8.8.1 Acting Adjustment (ACT RA / dA).................................................................................44
8.8.2 Valve flow Characteristic Adjustment (CHAR)..............................................................45
8.8.3 User defining flow Characteristics (USER SET) ...........................................................45
8.8.4 Tight Shut Open (TSHUT OP) ......................................................................................46
8.8.5 Tight Shut Close (TSHUT CL).......................................................................................46
8.8.6 Split Range Mode (SPLIT) ............................................................................................47

Smart Positioner
YT-2500 / 2550 / 2501 Series Product manual
Ver. 1.04 4
8.9 View Mode (VIEW)................................................................................................................48
9. Error and Warning Code.............................................................................................................50
9.1 Error code..............................................................................................................................50
9.2 Warning code........................................................................................................................51
10. Main Software Map...................................................................................................................52

Smart Positioner
YT-2500 / 2550 / 2501 Series Product manual
Ver. 1.04 5
1. Introduction
1.1 General Information for the users
Thank you for purchasing Young Tech Co., Ltd products. Each product has been fully
inspected after its production to offer you the highest quality and reliable performance.
Please read the product manual carefully prior to installing and commission the product.
The manual should be provided to the end-user.
The manual can be altered or revised without any prior notice. Any changes in
product’s specification, design, and/or any components may not be printed immediately
but until the following revision of the manual.
When the manual refers to “Valve Zero / Zero” means the final valve position upon
pneumatic pressure has been fully exhausted from positioner’s OUT1 port. The valve
zero position may differ between linear direct and reverse actions. (DA/RA)
The manual should not be duplicated or reproduced for any purpose without prior
approval from Young Tech Co., Ltd, Gimpo-si, South Korea.
In case of any other problems that are not stated in this manual, please make immediate
contact to Young Tech co., Ltd.
1.2 Manufacturer Warranty
For the safety, it is important to follow the instructions in the manual. Manufacturer will
not be responsible for any damages caused by user’s negligence.
Any modifications or repairs to the product may only be performed if expressed in this
manual. Injuries and physical damages caused by customer’s modifying or repairing the
product without a prior consultation with Young Tech co., Ltd will not be compensated. If
any alterations or modifications are necessary, please contact Young Tech Co., Ltd
directly.
Manufacturer warrants the product from the date of original purchase of the product for
eighteen (18) months, except as otherwise stated.
Manufacturer warranty will not cover products that have been subjected to abuse,
accidents, alterations, modifications, tampering, negligence, misuse, faulty installation,
lack of reasonable care, repair or service in any way that is not contemplated in the
documentation for the product, or if the model or serial number has been altered,
tampered with, defaced or removed; damages that occurs in shipment, due to act of
God, failure due to power surge, or cosmetic damage. Improper or incorrectly
performed maintenance will void this limited warranty.
For detailed warranty information, please contact the corresponding local Young Tech
Co., Ltd office or main office in South Korea.

Smart Positioner
YT-2500 / 2550 / 2501 Series Product manual
Ver. 1.04 6
1.3 Explosion Proof Warning (Only for Intrinsic safety type positioners)
Please ensure the unit is being used and installed in conformity with local, regional, and
national explosion proof within the proper safety barrier environment.
Refer to “2.6 Certifications”
Explosion proof type of cables and gaskets should be used, when explosion gases are
present at the installation site.
Positioner has 2 ports for power connection. Explosion proof type wires and packing
should be used. Blind plug is required when any port is not being used.
Cable rug with surface area of more than 0.195mm2with M4 spring washer should be
used to connect the power.
For external ground terminal, cable rug with surface area of more than 5.5mm2should
be used.
There is risk of explosion due to static electricity charge. Static electricity charge may
develop when cleaning the product with a dry cloth. It is imperative to avoid static
electricity charge in the hazardous environment.

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.

Smart Positioner
YT-2500 / 2550 / 2501 Series Product manual
Ver. 1.04 8
2.3 Label Description
Fig. 2-1: YT-2500 / 2501 None explosion type Fig. 2-2: YT-2550 None explosion type
Fig. 2-3: YT-2500 / 2501 Intrinsic safety type Fig. 2-4: YT-2550 Intrinsic safety type
Fig. 2-5: YT-2500 / 2501 Foundation Fieldbus type Fig. 2-6: YT-2550 Foundation Fieldbus type
Model Number: Indicates the model number and any options of the positioner.
Explosion Proof: Indicates certified explosion proof grade.
Input Signal: Indicates input signal range.
Operating Temp.: Indicates the allowable operating temperature.
Ambient Temp.: Indicates the allowable ambient temperature for explosion proof
Supply Pressure: Indicates the supply pressure range.
Ui, Ii, Pi, Ci, Li: Indicates the allowable electrical data in the certificate.
You can see the details in the certificate.
Serial Number: Indicates unique serial number.
YEAR : Indicates manufactured year.

Smart Positioner
YT-2500 / 2550 / 2501 Series Product manual
Ver. 1.04 9
2.4 Product Number
2.4.1 YT-2500 / 2550 series follows suffix symbols as follows.
YT-2500 / 2550 1 2 3 4 5 6 7 8
1 Motion Type
L :
R :
Linear
Rotary
2 Acting type
S :
D :
Single
Double
3 Explosion Proof
n :
i :
Non-Explosion
Ex ia IIC T5/T6
4 Lever Type
Linear
1 :
2 :
3 :
4 :
10 ~ 40 mm
20 ~ 70 mm
50 ~ 100 mm
100 ~ 150 mm
Rotary
1 :
2 :
3 :
4 :
5 :
M6 x 34L
M6 x 63L
M8 x 34L
M8 x 63L
Namur Standard
5 Conduit –
Air Connection Type
1 :
2 :
3 :
4 :
5 :
G1/2 - PT 1/4
G1/2 - NPT 1/4 (YT-2550 is available for No. 2 ONLY)
G1/2 - G 1/4
M20 - NPT 1/4
NPT1/2 - NPT 1/4
6 Communication
0 :
2 :
3 :
None
+ HART Communication
+ Foundation Fieldbus 1)
7 Option
0 :
1 :
2 :
3 :
4 :
5 :
None
+ Position Transmitter
+ Limit Switch(Mechanical Type)
+ Limit Switch(Proximity Type)
+ Position Transmitter and Limit Switch (Mechanical Type)
+ Position Transmitter and Limit Switch (Proximity Type)
8 Fail Option
F :
S :
Fail Freeze
Fail Safe
1) Foundation Fieldbus(FF) is available for only non-explosion model and cannot have any
other 7 options.

Smart Positioner
YT-2500 / 2550 / 2501 Series Product manual
Ver. 1.04 10
2.4.2 YT-2501 series follows suffix symbols as follows.
YT-2501 1 2 3 4 5 6 7 8 9
1 Motion Type
L :
R :
Linear
Rotary
2 Acting type
S :
D :
Single
Double
3 Explosion Proof
n :
i :
Non-Explosion
Ex ia IIC T5/T6
4 Lever Type
Linear
1 :
2 :
3 :
4 :
10 ~ 40 mm
20 ~ 70 mm
50 ~ 100 mm
100 ~ 150 mm
Rotary
5 :
Namur Standard
5 Conduit –
Air Connection Type
1 :
2 :
3 :
4 :
5 :
G1/2 - PT 1/4
G1/2 - NPT 1/4
G1/2 - G 1/4
M20 - NPT 1/4
NPT1/2 - NPT 1/4
6 Communication
0 :
2 :
3 :
None
+ HART Communication
+ Foundation Fieldbus 1)
7 Option
0 :
1 :
None
+ Position Transmitter
8 Fail Option
F :
S :
Fail Freeze
Fail Safe
9 Cable Length 2)
1 :
2 :
3 :
4 :
5m
10m
15m
20m
1) Foundation Fieldbus(FF) is available for only non-explosion model and cannot have position
transmitter option of 7 .
2) Maximum cable length is 20m.

Smart Positioner
YT-2500 / 2550 / 2501 Series Product manual
Ver. 1.04 11
2.5 Product Specification
2.5.1 YT-2500 / 2550 Specification
Model
YT-2500
YT-2550
Housing Material
Aluminum
Stainless steel 316
Motion Type
Linear
Rotary
Linear
Rotary
Acting Type
Single / Double
Input Signal
Standard
4~20mA DC
FF
9~32V DC, Max Current Draw 18mA
Minimum Current Signal
3.5mA(Standard), 3.8mA(Hart Included)
Supply Pressure
0.14 ~ 0.7 MPa (1.4 ~ 7 bar)
Stroke
10 ~ 150 mm
0 ~ 90°
10 ~ 150 mm
0 ~ 90°
Impedance
Max. 500Ω @ 20mA DC
Air Connection
PT(G or NPT) 1/4
NPT 1/4
Gauge Connection
PT(or NPT) 1/8
NPT 1/8
Conduit Entry
PF(G or NPT) 1/2 or M20
PF(G) 1/2
Ingress Protection
IP66
Explosion Proof
Ex ia IIC T5/T6 Gb, Ex ia IIIC T100℃/T85℃Db
Operating Temperature
-30℃~ 80℃(-22℉~ 176℉)
Ambient Temperature
Of Explosion proof
T5
-40℃~ 60℃(-40℉~ 140℉)
T6
-40℃~ 40℃(-40℉~ 104℉)
Linearity
±0.5% F.S.
Hysteresis
±0.5% F.S.
Sensitivity
±0.2% F.S
Repeatability
±0.3% F.S.
Flow Capacity
Fail Freeze
60 LPM (Sup.=0.14 MPa)
Fail Safe
40 LPM (Sup.=0.14 MPa)
Air Consumption
Fail Freeze
0.01 LPM (Sup.=0.14 MPa)
Fail Safe
6 LPM (Sup.=0.14 MPa)
Output Characteristic
Linear, Quick Open, EQ%, User Set (16 points)
Vibration
No Resonance up to 100Hz @ 6G
Humidity
5~95% RH @ 40℃
Communication (Option)
HART Communication (Rev. 5), Foundation Fieldbus
Feedback Signal (Option)
4~20mA (DC 9~28V)
L/S Rating
(Option)
Mechanical
AC 125V 3A / DC 30V 2A
Proximity
DC 8.2V 8.2mA
Weight
1.5 Kg (3.3 lb)
2.9 Kg (6.4 lb)
Painting
Epoxy Polyester Powder
Coating
-
Tested under ambient temperature of 20’C, absolute pressure of 760mmHg, and humidity of 65%. Please contact
Young Tech Co., Ltd for detailed testing specification.

Smart Positioner
YT-2500 / 2550 / 2501 Series Product manual
Ver. 1.04 12
2.5.2 YT-2501 Specification
Model
YT-2501
Housing Material
Aluminum
Motion Type
Linear
Rotary
Acting Type
Single / Double
Input Signal
Standard
4~20mA DC
FF
9~32V DC, Max Current Draw 18mA
Minimum Current Signal
3.5mA(Standard), 3.8mA(Hart Included)
Supply Pressure
0.14 ~ 0.7 MPa (1.4 ~ 7 bar)
Stroke
10 ~ 150 mm
0 ~ 90°
Impedance
Max. 500Ω @ 20mA DC
Air Connection
PT(G or NPT) 1/4
Gauge Connection
PT(or NPT) 1/8
Conduit Entry
PF(G or NPT) 1/2 or M20
Ingress Protection
IP66
Explosion Proof
Ex ia IIC T5/T6 Gb, Ex ia IIIC T100℃/T85℃ Db
Operating
Temperature
Sensor
-40℃~ 120℃(-40℉~ 248℉)
Body
-30℃~ 80℃(-22℉~ 176℉)
Ambient Temperature
Of Explosion proof
T5
-40℃~ 60℃(-40℉~ 140℉)
T6
-40℃~ 40℃(-40℉~ 104℉)
Linearity
±0.5% F.S.
Hysteresis
±0.5% F.S.
Sensitivity
±0.2% F.S
Repeatability
±0.3% F.S.
Flow Capacity
Fail Freeze
60 LPM (Sup.=0.14 MPa)
Fail Safe
40 LPM (Sup.=0.14 MPa)
Air Consumption
Fail Freeze
0.01 LPM (Sup.=0.14 MPa)
Fail Safe
6 LPM (Sup.=0.14 MPa)
Output Characteristic
Linear, Quick Open, EQ%, User Set (16 points)
Vibration
No Resonance up to 100Hz @ 6G
Humidity
5~95% RH @ 40℃
Communication (Option)
HART Communication, Foundation Fieldbus
Feedback Signal (Option)
4~20mA (DC 9~28V)
Weight
Sensor
0.6 Kg (1.3 lb)
0.9 Kg (2.0 lb)
Body
1.5 Kg (3.3 lb)
Painting
Epoxy Polyester Powder Coating
Tested under ambient temperature of 20’C, absolute pressure of 760mmHg, and humidity of 65%. Please contact
Young Tech Co., Ltd for detailed testing specification.

Smart Positioner
YT-2500 / 2550 / 2501 Series Product manual
Ver. 1.04 13
2.6 Certifications
KC (Korea)
Type : Intrinsic safety
Rating : Ex ia IIC T5/T6
Certification No. : 11-KB2BO-0163X(YT-2500)
10-KB2BO-0005X(YT-2500+LS(Dry contact))
14-KB2BO-0336X(YT-2500+LS(Non-contact))
11-KB2BO-0165X(YT-2550)
11-KB2BO-0166X(YT-2550+LS(Dry contact))
14-KB2BO-0337X(YT-2550+LS(Non-contact))
11-KB2BO-0164X(YT-2501)
Ambient temperature : -40 ~ +60℃(T5/T100℃), -40 ~ +40℃(T6/T85℃)
ATEX
Type : Intrinsic safety
Rating : II 2G Ex ia IIC T5/T6 Gb, II 2D Ex ia IIIC T100℃/T85℃Db IP6X
Certification No. : EPS 11 ATEX 1 363 X
Ambient temperature : -40 ~ +60℃(T5),-40 ~ +40℃(T6)
IECEx
Type : Intrinsic safety
Rating : Ex II 2G Ex ia IIC T5/T6 Gb, Ex II 2D Ex ia IIIC T100℃/T85℃Db IP6X
Certification No. : IECEx EPS 11.0009X
Ambient temperature : -40 ~ +60℃(T5/T100℃), -40 ~ +40℃(T6/T85℃)
NEPSI
Type : Intrinsic safety
Rating : Ex ia IIC T5/T6
Certification No. : GYJ15.1429

Smart Positioner
YT-2500 / 2550 / 2501 Series Product manual
Ver. 1.04 14
2.7 Parts and Assembly
Fig. 2-7: YT-2500 / 2550 series exploded view
1. Base Cover 6. Potentiometer
2. Option PCB 7. Main shaft
3. Main PCB 8. Base body
4. Pressure Gauge 9. Feedback Lever
5. Pilot
1
3
4
5
6
8
7
9
2

Smart Positioner
YT-2500 / 2550 / 2501 Series Product manual
Ver. 1.04 15
Fig. 2-8: YT-2501 exploded view
1. Base cover of Feedback sensor 10. Base cover of Positioner
2. Terminal of Feedback sensor 11. PCB of Positioner
3. Main shaft of Feedback sensor 12. Pilot of Positioner
4. Potentiometer of Feedback sensor 13.Body base of Positioner
5. Base body of Feedback sensor
6. Lever of Feedback sensor
7. Cable connector of Feedback sensor
8. Remote cable
9. Dome cover of Feedback sensor
1
3
4
5
6
8
7
10
2
9
1
2
3
4
5
11
12
13
7
Positioner
Rotary Sensor
Linear Sensor

Smart Positioner
YT-2500 / 2550 / 2501 Series Product manual
Ver. 1.04 16
2.8 Product Dimension
2.8.1 YT-2500
Fig. 2-9: YT-2500L Fig. 2-10:YT-2500R (Fork Lever Type)
Fig. 2-11:YT-2500R (Namur Type) Fig. 2-12: YT-2500R (L/S Option)

Smart Positioner
YT-2500 / 2550 / 2501 Series Product manual
Ver. 1.04 17
2.8.2 YT-2550
Fig. 2-13:YT-2550L Fig. 2-14: YT-2550R
2.8.3 YT-2501
Fig. 2-16:Rotary Feedback Sensor
Fig. 2-15:Linear Feedback Sensor Fig. 2-17: YT-2501 Positioner

Smart Positioner
YT-2500 / 2550 / 2501 Series Product manual
Ver. 1.04 18
3. Installation
3.1 Safety
When installing a positioner, please ensure to read and follow safety instructions.
Any input or supply pressures to valve, actuator, and / or to other related devices must
be turned off.
Use bypass valve or other supportive equipment to avoid entire system “shut down”.
Ensure there is no remaining pressure in the actuator.
3.2 Tools for installation
Hex key set for hex socket cap bolts
Screw drivers (+) & (-)
Spanners for hex head bolts
3.3 Linear positioner Installation
Linear positioner should be installed on linear motion valves such as globe or gate type
which uses spring return type diaphragm or piston actuators.
Fig. 3-1: YT-2500 / 2550L installation example Fig. 3-2: YT-2501L installation example
Before proceeding with the installation, ensure following components are available.
Positioner
Linear feedback sensor (Only YT-2501)
Remote cable (Only YT-2501)
Feedback lever and lever spring
M6 nut and spring washer (fastening feedback lever to a main shaft)
Bracket, bolts and washers for positioner or sensor –not supplied with the positioner
Connection bar –not supplied with the positioner

Smart Positioner
YT-2500 / 2550 / 2501 Series Product manual
Ver. 1.04 19
3.3.1 Safety
Proper bracket must be made in order to adapt the positioner on the actuator yoke.
Please consider following important points when a bracket is being designed.
Positioner’s feedback lever must be vertical to the valve stem at 50% of the valve stroke.
The connection bar of the actuator clamp for the feedback lever should be installed in
such a way that the valve stroke length coincides with the corresponding figure in “mm”
marked on the feedback lever. Improper setting may cause poor linearity
3.3.2 Linear positioner Installation Steps
1. Assemble the positioner with the bracket made in previous step by fastening the bolts.
The bolt size is M8 x 1.25P.
Fig. 3-3: Attaching to bracket Fig. 3-4: Attaching bracket to actuator yoke
2. Attach the positioner (or feedback sensor) with the bracket to the actuator yoke
–DO NOT TIGHTEN THE BRACKET COMPLETELY.
3. Connect connection bar to the actuator clamp. The hole gap on the feedback lever is
6.5mm so the connection bar’s outer diameter should be less than 6mm.
4. Connect an air-filter regulator to the actuator temporarily. Supply enough air pressure to
the actuator in order to position the valve stroke at 50% of the total stroke.

Smart Positioner
YT-2500 / 2550 / 2501 Series Product manual
Ver. 1.04 20
Fig. 3-5: Supplying proper regulated air to the actuator to position the valve at 50%
5. Insert the connection bar between the feedback lever and lever spring. The connection
bar must be located upward from the spring lever as shown below left figure. If it is
located downward from the spring lever as shown below right figure, the connection bar
or the spring lever will be worn out quickly because of excessive strong tension.
Fig. 3-6: Proper way to insert connection bar between feedback lever and lever spring