Honeywell Enraf Servo 954
SubCategory: LevelInstruments
Manufacturer: Honeywell
Industry:
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Key product features
- Servo displacer principle → Supports level, interface and density measurement
- Level accuracy below ±0.4 mm in selected versions → Supports custody-transfer duties
- Measuring range up to 150 m → Covers deep and large storage tanks
- Process temperature -200 to +200 °C → Supports cryogenic and hot process duties
- High-pressure versions up to 40 bar → Extends use to pressurised storage
- VITO, RTD and HART inputs → Integrates multiple tank measurements
- Multiple communication protocols → Simplifies integration with existing Enraf infrastructure
- Modular hardware architecture → Supports maintenance and application-specific configuration
- OIML R85 options → Supports regulated legal-metrology applications
- Migration options from older Enraf servo gauges → Helps manage installed-base lifecycle
Honeywell Enraf Servo 954 is intended for storage tanks where operators need more than a single level value. Depending on configuration, the gauge can measure product level, interface level, density, water bottom and temperature, making it relevant for refineries, terminals, chemicals and other bulk-liquid storage duties. High measurement repeatability supports inventory control and regulated custody-transfer workflows.
The servo principle uses a displacer suspended from a precision measuring wire and controlled by an electronic force-measurement system. By maintaining the displacer at a defined buoyancy point, the instrument can determine level and perform interface or density measurements when equipped accordingly. The modular design also supports VITO temperature/water probes, RTD inputs and HART devices, allowing one gauge to integrate several tank parameters.
Honeywell specifies level measuring ranges up to 150 m with selected measuring-wire configurations and level accuracy below ±0.4 mm up to 40 m in Xtreme Performance versions. Process temperature is specified from -200 to +200 °C, with high-pressure versions up to 40 bar and other versions up to 6 bar. Communication options include Honeywell Bi-phase Mark, TRL/2, Modbus RTU and HART 7, and selected configurations support OIML R85 and SIL-related functions.
The modular architecture supports maintenance and migration from installed Enraf platforms without requiring users to treat every tank as a greenfield project. Measurement wires, displacers, seals, tank connections, fieldbus architecture and legal-metrology requirements should nevertheless be reviewed before service or replacement. AxFlow can help identify the correct Servo 954 configuration, plan service and assess migration from older Enraf servo gauges.
