Description
METSO ND9106HN
Technical Specifications: Input control signal 4‑20 mA loop power supply; HART 7 protocol communication; supply air pressure range 1.4‑8 bar; adapt to single‑acting and double‑acting pneumatic actuator; compatible with linear straight‑stroke and quarter‑turn rotary valve; position feedback output 4‑20 mA; operating temperature range ‑40 ℃‑+85 ℃; protection class IP66 / NEMA 4X; housing material epoxy‑coated cast aluminum; weight 3.1 kg; explosion‑proof certification Ex ia IIc T6.
Functional Features: High‑precision closed‑loop valve position adjustment; automatic self‑calibration function; comprehensive valve and actuator fault diagnosis including air leakage, friction abnormality and stroke deviation; HART remote parameter setting and data reading; local key operation with LCD digital display; partial stroke test function; fault status local indication and remote alarm output; adapt to complex industrial field working conditions.
Application Scenarios: Petrochemical plant regulating valve field control; natural‑gas pipeline pressure regulating valve; pulp and paper mill process regulating valve; chemical plant reaction device flow and pressure control valve; thermal power plant flue gas desulfurization system regulating valve.
Performance Parameters: Positioning accuracy ≤±0.3 % full stroke; repeatability ≤0.2 %; fast dynamic response speed; strong anti‑interference capability for field electromagnetic environment; long‑term stable operation under high‑humidity and dusty field environment.
Material Composition: Epoxy coated cast‑aluminum enclosure; internal pneumatic piezoelectric valve components; high‑precision position sensor; HART communication processing circuit; liquid‑crystal display module; stainless‑steel mounting accessories; fluorine‑resistant sealing rubber ring.
Structural Features: Integrated compact modular structure; external mounting structure conforms to IEC 60534‑6‑1 valve positioner installation standard; front panel equipped with LCD display and three‑key local operation buttons; side part reserved for air supply and output pneumatic interface; internal mechanical‑pneumatic unit and electronic circuit unit realize isolation protection; external cable glands adopt M20 thread standard.
Working Principle: 4‑20 mA control signal sent by DCS enters positioner through signal cable. Main control unit compares received set‑point signal with actual valve stroke position signal collected by internal position sensor. Control signal outputs to piezoelectric pneumatic valve assembly. Pneumatic output pressure changes to drive valve actuator to move until actual valve position is consistent with set‑point value. HART circuit realizes two‑way data interaction with upper host system, completing parameter configuration and fault diagnosis information transmission.
Installation Requirements: Install ND9106HN on valve actuator according to IEC standard mounting bracket. Connect instrument dry air source which meets purification requirement. Signal cable uses shielded twisted‑pair wire, shielding layer single‑point grounding. Ensure pneumatic pipeline connection without air leakage. Set local operation parameters according to actual valve stroke range. Keep display window without direct strong sunlight irradiation.
Precautions for Use: Strictly use dry and clean instrument compressed air source, prohibit oil‑containing and water‑containing air source. Signal loop must match HART compatible equipment. Do not exceed allowable air supply pressure range. Regularly inspect pneumatic pipeline joint for air leakage. Conduct self‑calibration after disassembly and reinstallation. Do not open enclosure cover in explosive‑hazard site under power‑on condition.
