Cameron AAP3798102-00031

Technical & Performance Parameters

• Effective Measuring Stroke: 0 mm ~ 50 mm linear travel (00031 short stroke specification)
• Output Signal Standard: 4 mA (0% stroke) to 20 mA (100% stroke) DC analog current
• Measurement Linear Accuracy: ±0.1% full stroke range
• Repeatability Error: ±0.05% full measuring stroke
• Operating Supply Voltage: 12 V DC ~ 30 V DC two-wire loop power supply
• Subsea Rated Hydrostatic Pressure: 10,000 psi maximum seawater external pressure
• Surface Platform Working Pressure: Atmospheric to 200 psi non-submerged operation
• Operating Temperature Range: -40 °C ~ +85 °C
• Storage Temperature Range: -50 °C ~ +90 °C
• Ingress Protection Grade: IP68 full subsea sealing, continuous immersion rated
• Internal Circuit Isolation Withstand Voltage: 1000 V AC between sensing element and output signal circuit
• Anti-Vibration Compliance Standard: IEC 60068-2-6 offshore marine vibration certification
• Standard Physical Dimensions: Transmitter body diameter 42 mm, overall assembly length 185 mm, mounting thread M30×2
• Net Assembly Weight: 1.35 kg
• Industry Certifications: ATEX, IECEx, ABS marine, API 6D, SIL 2 functional safety certification

Material Composition

1. Outer pressure housing: Super duplex stainless steel UNS S32750, full passivation anti-salt corrosion treatment
2. Internal linear sensing core: Titanium alloy magnetic floating plunger, non-contact wear-free design
3. Signal conditioning circuit substrate: High-temperature FR4 multi-layer PCB with full marine-grade three-proof coating
4. Sealing components: Dual-layer fluorosilicone O-rings, compatible with seawater, crude oil, and hydraulic control fluid
5. Cable entry connector: Hastelloy C276 alloy explosion-proof marine cable gland
6. Internal magnetic sensing chip: Industrial-grade hall effect sensor with wide temperature stability
7. Mounting threaded sleeve: Hardened 316L stainless steel with anti-seize coating for offshore bolted installation

Structural Characteristics

1. Fully sealed monoblock pressure vessel housing design, zero fluid leakage risk under full subsea high hydrostatic pressure
2. Non-contact magnetic hall effect sensing architecture; no physical friction between plunger and internal sensor to eliminate mechanical wear
3. Dual independent fluorosilicone sealing layers at cable gland and plunger penetration points to block seawater ingress
4. Standard M30×2 external mounting thread for direct threaded installation into Cameron wellhead actuator cylinder end caps
5. Integrated two-wire loop power circuit; only two-core shielded marine cable required for both power supply and position signal transmission
6. Compact concentric layout of sensing plunger and circuit compartment to minimize overall assembly footprint on limited subsea tree installation space
7. Built-in passive lightning surge protection circuit integrated inside the sealed housing for offshore platform lightning strike resistance

Working Principle

1. Valve actuator mechanical linear travel drives the titanium magnetic plunger inside the transmitter’s pressure housing to perform synchronous linear displacement along the measuring stroke
2. Internal hall effect sensor continuously detects real-time magnetic field intensity generated by the moving plunger, corresponding proportionally to physical stroke position
3. On-board signal conditioning circuit eliminates marine electromagnetic noise, calibrates raw magnetic signals, and converts displacement data into standardized 4–20 mA analog current output
4. Two-wire marine shielded cable delivers loop power (12–30 V DC) to the transmitter while transmitting the 4–20 mA position feedback signal back to surface DCS or subsea SCM control unit
5. Internal isolation barrier electrically separates the subsea mechanical sensing assembly from surface-side control circuits to block ground potential difference interference across seawater media
6. Embedded surge protection components absorb lightning-induced high voltage surges from offshore power and signal cables to prevent circuit burnout
7. Real-time built-in self-test circuit monitors sensor signal loss and cable open-circuit faults; outputs fixed <2 mA under fault conditions to trigger upper system valve position alarm

Core Function Features

1. Non-contact magnetic sensing structure with infinite mechanical service life, no sliding friction wear under millions of actuator stroke cycles
2. IP68 full subsea sealing and 10,000 psi high-pressure rating compatible with deepwater subsea tree installation
3. Ultra-precise linear measurement ±0.1% FS, supporting high-accuracy wellhead choke valve flow regulation closed-loop control
4. Two-wire 4–20 mA loop-powered design reduces subsea cable quantity and subsea umbilical laying engineering cost
5. Native SIL 2 functional safety certification, meeting oil & gas process safety instrument system (SIS) specifications
6. Super duplex stainless steel housing delivers superior resistance to seawater chloride ion corrosion and crude oil chemical erosion
7. Wide operating temperature range adapts to Arctic cold offshore platforms and tropical high-temperature shallow sea production facilities
8. API 6D and ATEX/IECEx explosion-proof certifications for surface hazardous zone wellhead and subsea classified zone deployment

Advantage Highlights

1. Cameron OEM original matching component, direct bolt-in replacement for all Cameron subsea tree and surface wellhead actuator assemblies without mechanical modification
2. UNS S32750 super duplex material eliminates common offshore rust and pitting corrosion failures seen with 316L stainless steel transmitters
3. 50 mm short measuring stroke (00031 variant) optimized for compact subsea gate and choke valve actuators with limited travel range
4. Non-contact sensing removes routine mechanical lubrication maintenance requirements for remote subsea installations with no human access
5. Integrated surge protection eliminates need for external lightning arrestors on offshore signal cables
6. SIL 2 safety rating enables deployment in critical wellhead emergency shutdown (ESD) safety loops
7. Compact threaded mounting design reduces subsea tree structural modification and simplifies ROV remote replacement operations

Applicable Industries

Installation Requirements

1. Screw the M30×2 threaded mounting sleeve fully into the Cameron actuator cylinder end cap; tighten to specified 85 N·m installation torque using calibrated marine torque wrench
2. Apply certified nickel-based anti-seize compound evenly to all stainless steel threaded surfaces before installation to prevent saltwater thread seizure
3. Connect marine two-core shielded signal cable to the Hastelloy cable gland; uniformly compress gland sealing ferrule to achieve full IP68 waterproof cable locking
4. Ensure the transmitter magnetic plunger maintains full mechanical coupling with the actuator’s internal pushrod; zero free play between moving components
5. Route signal cable separately from high-voltage hydraulic power cables with minimum 50 cm physical separation to avoid analog signal distortion
6. For subsea deployment, conduct 12-hour external hydrostatic pressure testing at 12,000 psi after installation to verify IP68 sealing integrity before subsea lowering
7. Calibrate 4 mA (0 mm stroke) and 20 mA (50 mm stroke) signal endpoints via surface DCS system post-installation before valve commissioning

Usage Precautions

1. Do not disassemble the monoblock super duplex pressure housing; disassembly breaks factory IP68 sealing and high-pressure containment integrity, voiding subsea operational safety certification
2. Strictly avoid over-travel mechanical impact exceeding the rated 50 mm measuring stroke; plunger collision permanently damages internal hall effect sensing chip
3. Never use unshielded ordinary industrial cable for signal transmission; unshielded wiring causes severe marine electromagnetic signal drift and inaccurate valve position feedback
4. Do not expose the Hastelloy cable gland threaded connector to direct crude oil or chemical solvent spray without protective covers; chemical erosion degrades fluorosilicone sealing rings
5. Perform annual offshore visual inspection of cable gland sealing and housing surface passivation coating to detect early salt corrosion pitting
6. If feedback signal locks below 2 mA, immediately inspect cable for subsea water ingress open-circuit faults before transmitter replacement
7. Storage before installation must use desiccant-sealed moisture-proof packaging; avoid long-term exposure to coastal salt fog atmospheric environments