Product Description
Foxboro H90‑QNVD044L0 (Eckardt legacy under Schneider Electric), Analog Electro‑Pneumatic Valve Positioner, member of discontinued H90 series non‑smart positioner. It receives 4‑20 mA analog control signal from DCS/PLC and converts to pneumatic output for single‑acting pneumatic actuators. Adjustment via potentiometers and dip‑switches; no digital communication. Local mechanical travel indicator. Die‑cast aluminium housing with intrinsically‑safe explosion‑proof approval for petro‑chemical hazardous areas. Available supplies are new surplus stock and fully‑tested refurbished units.
Model code breakdown H90‑QNVD044L0
‑ H90: H90‑series analog electro‑pneumatic positioner
‑ Q: Single‑acting output
‑ N: NAMUR mounting interface
‑ V: Intrinsically‑safe Ex ia IIC T6
‑ D: 4‑20 mA DC input signal
‑ 044: Supply air pressure range 1.4‑4.0 bar
‑ L0: Version without position transmitter output
Technical Specification
| Item | Specification |
|---|---|
| Full Model | H90‑QNVD044L0 |
| Product Type | Analog Electro‑Pneumatic Valve Positioner (non‑smart) |
| Input Signal | 4‑20 mA DC, max. loop load 600 Ω |
| Output Action | Single‑acting pneumatic output |
| Supply Air Pressure | 1.4‑4.0 bar (20‑58 psi), clean dry instrument air |
| Stroke Compatibility | Linear:3‑100 mm; Rotary:0‑90° |
| Air Port Thread | 1/4‑NPT |
| Housing Material | Die‑cast aluminium |
| Ingress Protection | IP65 / NEMA 4 |
| Explosion‑proof | Ex ia IIC T6, ATEX / FM intrinsic safety |
| Adjustment | Potentiometer & dip‑switch; No HART / fieldbus |
| Position Indication | Local mechanical pointer; NO 4‑20 mA feedback output |
| Operating Ambient Temp | ‑40℃ ~ +80℃ |
| Storage Temperature | ‑45℃ ~ +85℃ |
| Steady‑state Air Consumption | 0.12 m³/h |
| Mounting Standard | NAMUR IEC60534‑6 for linear & rotary actuators |
| Weight | Approx. 2.7 kg |
| Country of Origin | Germany (Eckardt) |
Product Application
- Petro‑chemical, oil‑gas hazardous‑area field service, matched with single‑acting diaphragm / piston control valves.
- Converts 4‑20 mA analog signal from DCS/PLC to pneumatic output for precise valve‑stroke control.
- Flow, pressure, level and temperature control loops; legacy analog control systems.
- Spare‑part replacement for decommissioned plants; intrinsic‑safety hazardous‑location service.
Related & Retrofit Models
‑ H90‑QNVD044L1: Variant with 4‑20 mA position‑transmitter output
‑ H90‑DNVD044L0: Double‑acting H90 positioner
‑ SRI986: Later analog positioner, also discontinued
‑ SRD991‑BHNS7EA4NR: Foxboro smart HART positioner, modern retrofit solution
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