Flowserve Positioner LOGIX 3200 Series - 32021Q-10-D6-E-04-40-0G-0F

The Logix 3200 Series operates using a two-stage, stem-positioning algorithm that combines an inner loop for fast spool valve control and an outer loop for stem position control. The process involves comparing a control command to the measured stem position, and if a deviation exists, the inner loop uses a piezo valve to adjust the spool position, which in turn moves the stem to correct the deviation. This digital positioner uses a 4-20 mA signal, HART protocol, and software for configuration and auto-tuning to achieve accurate and responsive valve control.

Detailed working principle

• Two-stage control: The positioner uses a two-stage control loop to manage the valve's movement.

• Inner-loop (Spool Control): This loop quickly adjusts the position of an internal spool valve. It receives a signal from the outer loop and uses a piezo valve to modulate the air pressure under a diaphragm.
• Outer-loop (Stem Position Control): This loop compares the desired position (from the input signal) with the actual stem position, which is measured by a stem position sensor. It sends a signal to the inner loop to make corrections as needed.

• Actuation: The inner loop's adjustment of the spool valve changes the air pressure to the actuator. This pressure change moves the valve stem until the stem's position matches the desired control command, at which point the deviation becomes zero and the process stops.

Configuration and tuning:

• Digital Characterization: Instead of mechanical cams, the positioner uses software to map the input signal to the desired output, allowing for linear, equal percent, or custom 21-point curves to be configured digitally via software or a handheld communicator.
• Auto-tune: An automatic tuning feature helps select the correct gain settings for optimal performance by cycling the actuator and analyzing its response.
• HART communication: The positioner uses the HART protocol for two-way communication, enabling remote configuration and diagnostic data retrieval through devices like handheld communicators or software like ValveSight.
• Power and signal: The positioner is a two-wire device that is completely powered by the 4-20 mA input signal.

Key components and their function

• Microprocessor: The "brain" of the positioner, the 32-bit microprocessor continuously reads the input signal and the position sensor's feedback. It runs the control algorithm to determine any necessary adjustments.
• Input Signal: The positioner is a 2-wire, loop-powered device that receives a 4–20 mA current signal from a control system (like a DCS or PLC). This signal represents the desired valve position (e.g., 4 mA = 0% open, 20 mA = 100% open).
• Piezoelectric Valve Pressure Modulator: This is the core of the control mechanism. The microprocessor sends a voltage to a piezo beam bender, which deflects to precisely modulate the air pressure being sent to the valve actuator.
• Stem Position Sensor: This sensor provides continuous feedback on the actual position of the valve stem. This information is crucial for the closed-loop control system to detect and correct any deviation from the desired position.
• Two-Stage Positioning Algorithm: The microprocessor runs a specialized algorithm to maintain position:

• Outer Loop (Stem Position Control): Compares the incoming control command with the valve stem's actual position. If a difference (deviation) exists, the algorithm sends a signal to the inner loop.
• Inner Loop (Spool Control): Receives the signal from the outer loop and quickly adjusts the position of the spool valve using the piezo pressure modulator. This changes the air pressure to the actuator, causing the valve stem to move.

• HART Communication: The positioner supports the HART (Highway Addressable Remote Transducer) communication protocol, which allows for remote configuration, calibration, and diagnostics using a HART handheld device or software.

The operational cycle

1. The Logix 3200 receives a 4–20 mA command signal from the central control system.
2. The stem position sensor provides a real-time feedback signal of the valve's actual position to the microprocessor.
3. The microprocessor's control algorithm compares the command signal to the feedback signal to determine if there is a deviation.
4. If a deviation is detected, the microprocessor adjusts the voltage to the piezo pressure modulator in the inner control loop.
5. The piezo modulator then controls the air pressure delivered to the valve actuator, causing the valve stem to move toward the desired position.
6. The position sensor instantly registers the movement and provides new feedback, allowing the algorithm to continuously correct the position until the deviation is zero.

 Full Datasheet

Positioner Transmitter Feature  

• Manufacturer: LOGIX 3200
• Product No. :  32021Q-10-D6-E-04-40-0G-0F
• 3200 MD - Protocol hart, Diagnostics Standard, Material Aluminum Black Paint (Automax), Design Version Q
• Certifications: 10 - North America Metal Nameplate Explosion Proof Class Intrinsically Safe: Non-Incendive.
• Shaft: D6 - DD 316 Stainless Steel Shaft (Valtek Standard)
• Conduit Connections: E - 1/2 in. NPT
• Action: 04 - Four-way (Double-Acting)
• Temperature: 40 - Low Temperature (refer to certification table)
• Gauges: OG -  SS with brass internals, psi (bar/kPa) (Valtek Standard)
• Special Options: OF - 4-20 mA Position Feedback

There are several Model of positioner, for more details read the PDF below 

Basic Ordering Information 

Flowserve Positioner LOGIX 3200 Series - 3200MD-28-N6-E-04-40-OG-OF

The Logix 3200 Series operates using a two-stage, stem-positioning algorithm that combines an inner loop for fast spool valve control and an outer loop for stem position control. The process involves comparing a control command to the measured stem position, and if a deviation exists, the inner loop uses a piezo valve to adjust the spool position, which in turn moves the stem to correct the deviation. This digital positioner uses a 4-20 mA signal, HART protocol, and software for configuration and auto-tuning to achieve accurate and responsive valve control.

Detailed working principle

• Two-stage control: The positioner uses a two-stage control loop to manage the valve's movement.

• Inner-loop (Spool Control): This loop quickly adjusts the position of an internal spool valve. It receives a signal from the outer loop and uses a piezo valve to modulate the air pressure under a diaphragm.
• Outer-loop (Stem Position Control): This loop compares the desired position (from the input signal) with the actual stem position, which is measured by a stem position sensor. It sends a signal to the inner loop to make corrections as needed.

• Actuation: The inner loop's adjustment of the spool valve changes the air pressure to the actuator. This pressure change moves the valve stem until the stem's position matches the desired control command, at which point the deviation becomes zero and the process stops.

Configuration and tuning:

• Digital Characterization: Instead of mechanical cams, the positioner uses software to map the input signal to the desired output, allowing for linear, equal percent, or custom 21-point curves to be configured digitally via software or a handheld communicator.
• Auto-tune: An automatic tuning feature helps select the correct gain settings for optimal performance by cycling the actuator and analyzing its response.
• HART communication: The positioner uses the HART protocol for two-way communication, enabling remote configuration and diagnostic data retrieval through devices like handheld communicators or software like ValveSight.
• Power and signal: The positioner is a two-wire device that is completely powered by the 4-20 mA input signal.

Key components and their function

• Microprocessor: The "brain" of the positioner, the 32-bit microprocessor continuously reads the input signal and the position sensor's feedback. It runs the control algorithm to determine any necessary adjustments.
• Input Signal: The positioner is a 2-wire, loop-powered device that receives a 4–20 mA current signal from a control system (like a DCS or PLC). This signal represents the desired valve position (e.g., 4 mA = 0% open, 20 mA = 100% open).
• Piezoelectric Valve Pressure Modulator: This is the core of the control mechanism. The microprocessor sends a voltage to a piezo beam bender, which deflects to precisely modulate the air pressure being sent to the valve actuator.
• Stem Position Sensor: This sensor provides continuous feedback on the actual position of the valve stem. This information is crucial for the closed-loop control system to detect and correct any deviation from the desired position.
• Two-Stage Positioning Algorithm: The microprocessor runs a specialized algorithm to maintain position:

• Outer Loop (Stem Position Control): Compares the incoming control command with the valve stem's actual position. If a difference (deviation) exists, the algorithm sends a signal to the inner loop.
• Inner Loop (Spool Control): Receives the signal from the outer loop and quickly adjusts the position of the spool valve using the piezo pressure modulator. This changes the air pressure to the actuator, causing the valve stem to move.

• HART Communication: The positioner supports the HART (Highway Addressable Remote Transducer) communication protocol, which allows for remote configuration, calibration, and diagnostics using a HART handheld device or software.

The operational cycle

1. The Logix 3200 receives a 4–20 mA command signal from the central control system.
2. The stem position sensor provides a real-time feedback signal of the valve's actual position to the microprocessor.
3. The microprocessor's control algorithm compares the command signal to the feedback signal to determine if there is a deviation.
4. If a deviation is detected, the microprocessor adjusts the voltage to the piezo pressure modulator in the inner control loop.
5. The piezo modulator then controls the air pressure delivered to the valve actuator, causing the valve stem to move toward the desired position.
6. The position sensor instantly registers the movement and provides new feedback, allowing the algorithm to continuously correct the position until the deviation is zero.

 Full Datasheet

Positioner Transmitter Feature  

• Manufacturer: LOGIX 3200
• Product No. :  3200MD-28-N6-E-04-40-OG-OF
• 3200 MD - Protocol hart, Diagnostics Standard, Material Aluminum, White Paint (Valtek), Design Version MD
• Certifications: 28 - ATEX: Mylar, Multiple Concept Label: Explosion Proof: II2G Ex d IIB+H T5; II2D Ex tD A21 Intrinsically Safe: ll1G Ex ia llC, T4 ll1D Ex iaD 20 T95 °C Non-incendive: ll3G Ex nL nA llC, T4 ll3D Ex tD A22 T95 °C
• Shaft: N6 - NAMUR 316 Stainless Steel (VDI/VDE 3845)
• Threaded Connections: 1 - Mounting: 5/16" 18 UNC, Pneumatics: 1/4" NPTF, Conduit: 1/2" NPTF, Vents 1/4" NPTF
• Conduit Connections: E - 1/2 in. NPT
• Action: 04 - Four-way (Double-Acting)
• Temperature: 40 - Low Temperature (refer to certification table)
• Gauges: OG -  SS with brass internals, psi (bar/kPa) (Valtek Standard)
• Special Options: OF - 4-20 mA Position Feedback

There are several Model of positioner, for more details read the PDF below 

Basic Ordering Information 

Flowserve Positioner Logix 500MD Series - 520MD-02-Y1DEE-0000-000

The Logix 500MD series works by using a two-wire, 4-20 mA input signal to control a valve actuator through a two-stage control loop. The 4-20 mA signal is processed by a microprocessor, which compares it to the measured valve stem position. The microprocessor then sends a signal to a pneumatic amplifier, which uses air pressure to move the actuator to the desired position, providing tight control.

Detailed working principle

• Input and initial processing: The system receives a 4-20 mA control signal, which is also used to power the entire circuit. A microprocessor reads this input and compares it to the current position of the valve stem.
• Pneumatic amplification: The microprocessor sends an output command to a piezo valve inside a pneumatic amplifier.

• The pneumatic amplifier controls the flow of air to the actuator, which is what causes the valve to stroke or move.
• The position of the pilot valve within the amplifier is fed back to a secondary control loop, which provides for more precise control than a single-stage system.

• Positioning and control: As the valve approaches its target position, the difference between the commanded and measured positions decreases.

• This causes the output to the piezo valve to decrease, slowing the movement as it gets closer.
• When the valve is at the desired position, the pneumatic amplifier's output is zero, which holds the valve steady.

  Communication and diagnostics:

• The Logix 520MD and later models can use the HART protocol for two-way communication, allowing for remote monitoring, configuration, and diagnostics.
• Diagnostic software like ValveSight can detect potential issues and help perform tests like Partial Stroke Testing.
• An auto-tune function can be used to automatically set the control parameters for optimal performance.

Key components and their functions

• Microprocessor-based electronic control module: This component receives the 4–20 mA command signal from the process controller and determines the necessary adjustments to achieve the target valve position. For specific models like the 520MD, this module also enables two-way communication using the HART protocol.
• Piezo valve electro-pneumatic converter: The microprocessor sends a command to the internal piezo valve, which precisely controls the pilot pressure. This pilot pressure then drives a pneumatic amplifier.
• Infinite resolution valve position sensor: A feedback sensor, typically a follower arm attached to the valve stem, provides continuous, highly accurate measurement of the valve's actual position. This signal is sent back to the microprocessor.
• Pneumatic amplifier: This component uses the pilot pressure from the piezo valve to control the flow of a larger volume of air to the valve actuator, causing the valve to move.
• Valve actuator: The actuator converts the air pressure changes from the pneumatic amplifier into the physical force and motion needed to operate the valve.

Step-by-step working principle

1. Command signal input: The positioner receives a standard 4–20 mA analog signal from a control system, which represents the desired valve position (e.g., 4 mA is fully closed, 20 mA is fully open).
2. Position comparison: The microprocessor inside the positioner compares the input command signal to the real-time position feedback from the valve position sensor.
3. Error calculation and control: The microprocessor's control algorithm calculates the difference (error) between the commanded position and the actual position.
4. Piezo valve activation: Based on the error calculation, the microprocessor sends a command to the piezo valve to increase or decrease the pilot pressure. The piezo valve, which has no moving parts and consumes very little power, can make very precise pressure adjustments.
5. Pneumatic amplification: The pilot pressure from the piezo valve controls the pneumatic amplifier, which opens and closes internal poppet valves to regulate the main air supply to the actuator.
6. Actuator movement: The regulated air pressure from the amplifier causes the actuator to stroke, moving the valve stem or shaft.
7. Closed-loop feedback: As the valve moves, the position sensor continuously updates the microprocessor with its new position.
8. Position stabilization: When the valve approaches the desired position, the error signal decreases. The positioner reduces the air pressure, slowing the actuator's movement until the actual and commanded positions match. The air output is then held at zero to maintain the valve in a constant position.

Advantages of this technology 

• High precision: The digital control algorithm and infinite resolution position sensor provide extremely accurate positioning.
• Fast commissioning: Features like "Quick-Cal" and "Auto-Tune" allow for rapid and simple calibration, reducing setup time.
• Advanced diagnostics: For models with HART communication, the positioner provides extensive diagnostic data, including valve signatures, leak detection, and performance monitoring. This helps predict and prevent potential failures.
• Low air consumption: The piezo technology allows for high-performance control with minimal air use, improving efficiency.
• Reliability: The state-of-the-art technology and diagnostic capabilities lead to high reliability and uptime.

 Full Datasheet

Positioner Transmitter Feature  

• Manufacturer: Logix 500MD
• Product No. :  520MD-02-Y1DEE-0000-000
• 520MD -Positioner Model Standard, Communication and Diagnostic 520 HART - Standard
• Certifications: 02 - Intrinsically Safe Class I, Div 1, Groups A,B,C,D (Factory Mutual / CSA)
• Housing: Y - Aluminum - Black Base with Yellow Cover
• Threaded Connections: 1 - Mounting: 5/16" 18 UNC, Pneumatics: 1/4" NPTF, Conduit: 1/2" NPTF, Vents 1/4" NPTF
• Feedback Shaft: D - D - 316 Stainless Steel Shaft (Valtek Standard)
• Temperature: E - -40 °C to 85 °C (-40 °F to 185 °F)
• Language: E - English
• Position Indicator: 0 -  No indicator
• Special Options: 0 - Standard
• Add-in Electronic Circuits: 0 - None
• Limit Switches: 0 - No switches
• Manifold Options (MM): 00 - No manifold
• Gauge Options (N): 0 - No gauges

There are several Model of positioner, for more details read the PDF below 

Basic Ordering Information 

Flowserve Positioner Logix 500MD Series - 520MD-14-W1D300-000-1000

The Logix 500MD series works by using a two-wire, 4-20 mA input signal to control a valve actuator through a two-stage control loop. The 4-20 mA signal is processed by a microprocessor, which compares it to the measured valve stem position. The microprocessor then sends a signal to a pneumatic amplifier, which uses air pressure to move the actuator to the desired position, providing tight control.

Detailed working principle

• Input and initial processing: The system receives a 4-20 mA control signal, which is also used to power the entire circuit. A microprocessor reads this input and compares it to the current position of the valve stem.
• Pneumatic amplification: The microprocessor sends an output command to a piezo valve inside a pneumatic amplifier.

• The pneumatic amplifier controls the flow of air to the actuator, which is what causes the valve to stroke or move.
• The position of the pilot valve within the amplifier is fed back to a secondary control loop, which provides for more precise control than a single-stage system.

• Positioning and control: As the valve approaches its target position, the difference between the commanded and measured positions decreases.

• This causes the output to the piezo valve to decrease, slowing the movement as it gets closer.
• When the valve is at the desired position, the pneumatic amplifier's output is zero, which holds the valve steady.

  Communication and diagnostics:

• The Logix 520MD and later models can use the HART protocol for two-way communication, allowing for remote monitoring, configuration, and diagnostics.
• Diagnostic software like ValveSight can detect potential issues and help perform tests like Partial Stroke Testing.
• An auto-tune function can be used to automatically set the control parameters for optimal performance.

Key components and their functions

• Microprocessor-based electronic control module: This component receives the 4–20 mA command signal from the process controller and determines the necessary adjustments to achieve the target valve position. For specific models like the 520MD, this module also enables two-way communication using the HART protocol.
• Piezo valve electro-pneumatic converter: The microprocessor sends a command to the internal piezo valve, which precisely controls the pilot pressure. This pilot pressure then drives a pneumatic amplifier.
• Infinite resolution valve position sensor: A feedback sensor, typically a follower arm attached to the valve stem, provides continuous, highly accurate measurement of the valve's actual position. This signal is sent back to the microprocessor.
• Pneumatic amplifier: This component uses the pilot pressure from the piezo valve to control the flow of a larger volume of air to the valve actuator, causing the valve to move.
• Valve actuator: The actuator converts the air pressure changes from the pneumatic amplifier into the physical force and motion needed to operate the valve.

Step-by-step working principle

1. Command signal input: The positioner receives a standard 4–20 mA analog signal from a control system, which represents the desired valve position (e.g., 4 mA is fully closed, 20 mA is fully open).
2. Position comparison: The microprocessor inside the positioner compares the input command signal to the real-time position feedback from the valve position sensor.
3. Error calculation and control: The microprocessor's control algorithm calculates the difference (error) between the commanded position and the actual position.
4. Piezo valve activation: Based on the error calculation, the microprocessor sends a command to the piezo valve to increase or decrease the pilot pressure. The piezo valve, which has no moving parts and consumes very little power, can make very precise pressure adjustments.
5. Pneumatic amplification: The pilot pressure from the piezo valve controls the pneumatic amplifier, which opens and closes internal poppet valves to regulate the main air supply to the actuator.
6. Actuator movement: The regulated air pressure from the amplifier causes the actuator to stroke, moving the valve stem or shaft.
7. Closed-loop feedback: As the valve moves, the position sensor continuously updates the microprocessor with its new position.
8. Position stabilization: When the valve approaches the desired position, the error signal decreases. The positioner reduces the air pressure, slowing the actuator's movement until the actual and commanded positions match. The air output is then held at zero to maintain the valve in a constant position.

Advantages of this technology 

• High precision: The digital control algorithm and infinite resolution position sensor provide extremely accurate positioning.
• Fast commissioning: Features like "Quick-Cal" and "Auto-Tune" allow for rapid and simple calibration, reducing setup time.
• Advanced diagnostics: For models with HART communication, the positioner provides extensive diagnostic data, including valve signatures, leak detection, and performance monitoring. This helps predict and prevent potential failures.
• Low air consumption: The piezo technology allows for high-performance control with minimal air use, improving efficiency.
• Reliability: The state-of-the-art technology and diagnostic capabilities lead to high reliability and uptime.

 Full Datasheet

Positioner Transmitter Feature  

• Manufacturer: Logix 500MD
• Product No. :  520MD-14-W1D300-000-1000
• 500MD - Intrinsically Safe, IP-66 / HART; 8-DIP Set-Up with LCD Option; Standard (Basic Functionality)
• Certifications: 14 - General Purpose
• Housing: W - Aluminum - Black Base with White Cover
• Threaded Connections: 1 - Mounting: 5/16" 18 UNC, Pneumatics: 1/4" NPTF, Conduit: 1/2" NPTF, Vents 1/4" NPTF
• Feedback Shaft: D - D - 316 Stainless Steel Shaft (Valtek Standard)
• Action: 3 - Four-way (Double-Acting), Spool Style Relay
• Position Indicator: 0 - No Indicator
• Special Options: 0 -  No special options
• Manifold: 00 - No Manifold
• Gauges: 0 - No Gauges
• Display: 1 - LCD
• Auxiliary Card Slot 1: 0- Slot 1 - No Card
• Auxiliary Card Slot 2: 0 - Slot 2 - No Card
• Limit Switches: 0 - No Switches

There are several Model of positioner, for more details read the PDF below 

Basic Ordering Information 

Flowserve Positioner Logix 500MD Series - 520MD+37-W1D300-GM3-0000

The Logix 500MD series works by using a two-wire, 4-20 mA input signal to control a valve actuator through a two-stage control loop. The 4-20 mA signal is processed by a microprocessor, which compares it to the measured valve stem position. The microprocessor then sends a signal to a pneumatic amplifier, which uses air pressure to move the actuator to the desired position, providing tight control.

Detailed working principle

• Input and initial processing: The system receives a 4-20 mA control signal, which is also used to power the entire circuit. A microprocessor reads this input and compares it to the current position of the valve stem.
• Pneumatic amplification: The microprocessor sends an output command to a piezo valve inside a pneumatic amplifier.

• The pneumatic amplifier controls the flow of air to the actuator, which is what causes the valve to stroke or move.
• The position of the pilot valve within the amplifier is fed back to a secondary control loop, which provides for more precise control than a single-stage system.

• Positioning and control: As the valve approaches its target position, the difference between the commanded and measured positions decreases.

• This causes the output to the piezo valve to decrease, slowing the movement as it gets closer.
• When the valve is at the desired position, the pneumatic amplifier's output is zero, which holds the valve steady.

  Communication and diagnostics:

• The Logix 520MD and later models can use the HART protocol for two-way communication, allowing for remote monitoring, configuration, and diagnostics.
• Diagnostic software like ValveSight can detect potential issues and help perform tests like Partial Stroke Testing.
• An auto-tune function can be used to automatically set the control parameters for optimal performance.

Key components and their functions

• Microprocessor-based electronic control module: This component receives the 4–20 mA command signal from the process controller and determines the necessary adjustments to achieve the target valve position. For specific models like the 520MD, this module also enables two-way communication using the HART protocol.
• Piezo valve electro-pneumatic converter: The microprocessor sends a command to the internal piezo valve, which precisely controls the pilot pressure. This pilot pressure then drives a pneumatic amplifier.
• Infinite resolution valve position sensor: A feedback sensor, typically a follower arm attached to the valve stem, provides continuous, highly accurate measurement of the valve's actual position. This signal is sent back to the microprocessor.
• Pneumatic amplifier: This component uses the pilot pressure from the piezo valve to control the flow of a larger volume of air to the valve actuator, causing the valve to move.
• Valve actuator: The actuator converts the air pressure changes from the pneumatic amplifier into the physical force and motion needed to operate the valve.

Step-by-step working principle

1. Command signal input: The positioner receives a standard 4–20 mA analog signal from a control system, which represents the desired valve position (e.g., 4 mA is fully closed, 20 mA is fully open).
2. Position comparison: The microprocessor inside the positioner compares the input command signal to the real-time position feedback from the valve position sensor.
3. Error calculation and control: The microprocessor's control algorithm calculates the difference (error) between the commanded position and the actual position.
4. Piezo valve activation: Based on the error calculation, the microprocessor sends a command to the piezo valve to increase or decrease the pilot pressure. The piezo valve, which has no moving parts and consumes very little power, can make very precise pressure adjustments.
5. Pneumatic amplification: The pilot pressure from the piezo valve controls the pneumatic amplifier, which opens and closes internal poppet valves to regulate the main air supply to the actuator.
6. Actuator movement: The regulated air pressure from the amplifier causes the actuator to stroke, moving the valve stem or shaft.
7. Closed-loop feedback: As the valve moves, the position sensor continuously updates the microprocessor with its new position.
8. Position stabilization: When the valve approaches the desired position, the error signal decreases. The positioner reduces the air pressure, slowing the actuator's movement until the actual and commanded positions match. The air output is then held at zero to maintain the valve in a constant position.

Advantages of this technology 

• High precision: The digital control algorithm and infinite resolution position sensor provide extremely accurate positioning.
• Fast commissioning: Features like "Quick-Cal" and "Auto-Tune" allow for rapid and simple calibration, reducing setup time.
• Advanced diagnostics: For models with HART communication, the positioner provides extensive diagnostic data, including valve signatures, leak detection, and performance monitoring. This helps predict and prevent potential failures.
• Low air consumption: The piezo technology allows for high-performance control with minimal air use, improving efficiency.
• Reliability: The state-of-the-art technology and diagnostic capabilities lead to high reliability and uptime.

 Full Datasheet

Positioner Transmitter Feature  

• Manufacturer: Logix 500MD
• Product No. :  520MD+37-W1D300-GM3-0000
• 500MD - Intrinsically Safe, IP-66 / HART; 8-DIP Set-Up with LCD Option; Standard (Basic Functionality)
• Certifications: 37 - North America/ATEX/IECEx Intrinsically Safe Cl I Div 1 Gr A,B,C,D Ex ia IIC / Non-Incendive (North America only) Cl I Div 2 Gr A,B,C,D
• Housing: W - Aluminum - Black Base with White Cover
• Threaded Connections: 1 - Mounting: 5/16" 18 UNC, Pneumatics: 1/4" NPTF, Conduit: 1/2" NPTF, Vents 1/4" NPTF
• Feedback Shaft: D - D - 316 Stainless Steel Shaft (Valtek Standard)
• Action: 3 - Four-way (Double-Acting), Spool Style Relay
• Position Indicator: 0 - No Indicator
• Special Options: 0 -  No special options
• Manifold: GM - Gauge Manifold - AluminumP
• Gauges: 3 - SS with SS Internals. psi (bar/kPa)
• Display: 0 - No LCD
• Auxiliary Card Slot 1: 0- Slot 1 - No Card
• Auxiliary Card Slot 2: 0 - Slot 2 - No Card
• Limit Switches: 0 - No Switches

There are several Model of positioner, for more details read the PDF below 

Basic Ordering Information