Multi-Point Temperature Measurement for Cryogenic Storage
The Rosemount 566 Multiple Spot Temperature Sensor is specifically designed for temperature measurement in cryogenic and refrigerated storage tanks.
Unlike a conventional single-point temperature sensor, the Rosemount 566 uses multiple Pt-100 temperature elements installed at different heights inside the tank. The individual measurement points provide a temperature profile through the stored liquid, while the fully immersed elements are used to determine product temperature.
This makes the sensor particularly valuable for LNG storage, where temperature stratification and accurate average product temperature are important for inventory management and safe tank operation.
Designed for LNG and Liquefied Gas Applications
The Rosemount 566 is the dedicated cryogenic version of the Rosemount multiple spot temperature sensor family.
It is suitable for applications involving:
- LNG storage tanks
- Liquefied natural gas terminals
- Refrigerated liquid storage
- Cryogenic liquid tanks
- Liquefied gas storage
- Tank temperature profiling
- Product stratification monitoring
The sensor is equipped with Class A Pt-100 elements designed for low-temperature measurement. Emerson also provides a specialized calibration option to achieve higher measurement performance and support GIIGNL requirements for stratification detection.
Up to 16 Temperature Measurement Points
The Rosemount 566 can be configured with up to 16 Pt-100 spot elements.
By placing the elements at different heights, the sensor can continuously monitor temperature distribution throughout the liquid. This allows operators to identify temperature differences between different tank levels instead of relying on a single temperature measurement.
The measured values are transmitted through the Rosemount 2240S Multi-input Temperature Transmitter and can be distributed to Rosemount TankMaster inventory software or a DCS/host system through the Rosemount tank gauging system.
High Accuracy for Cryogenic Temperature Measurement
The Rosemount 566 uses Pt-100 elements according to IEC 60751:2022 with Class A tolerance.
The standard thermometer accuracy is:
- Class A: ±(0.15 + 0.002|t|) °C
- Temperature validity: -170 to +95 °C
- Optional Callendar-Van Dusen calibration can provide ±20 mK uncertainty under the specified calibrated conditions.
This calibration capability is particularly useful for applications requiring highly accurate temperature measurement for inventory calculations and stratification monitoring.
Robust Construction for Low-Temperature Tanks
The temperature elements are encapsulated in a stainless steel tube filled with argon gas. This design helps prevent water condensation inside the sensor at low temperatures.
The immersed parts are constructed from AISI 316 stainless steel, while the Rosemount 566 lead wire insulation uses PTFE with an ETFE lead-out section.
Key Technical Highlights
- Sensor type: Multiple Spot Temperature Sensor
- Temperature element: Pt-100
- Number of elements: Up to 16
- Accuracy class: Class A
- Standard accuracy: ±(0.15 + 0.002|t|) °C
- Cryogenic temperature range: -170 to +100 °C
- Class A validity range: -170 to +95 °C
- Optional calibration: Callendar-Van Dusen calibration
- Calibrated uncertainty: ±20 mK with applicable X8 calibration
- Wiring: 3-wire or 4-wire configurations
- Protective sheath: AISI 316 stainless steel
- Sheath diameter: 1 in.
- Standard overall length: 5–70 m
- Minimum tank opening: 2 in. (50.8 mm)
- Connection: M33 × 1.5 top fitting
- Lead wire: 0.4 m standard for integrated 2240S installation
- Protection: IP68 when connected to the Rosemount 2240S transmitter
- Compatible transmitter: Rosemount 2240S Multi-input Temperature Transmitter
Typical Applications
LNG Storage Tanks
The Rosemount 566 is designed specifically for cryogenic LNG storage tanks, providing temperature measurements at multiple heights throughout the stored product.
Liquefied Gas Storage
The sensor can be used for temperature monitoring in refrigerated storage tanks containing LNG and other liquefied gases.
Tank Temperature Profiling
Multiple Pt-100 elements provide a vertical temperature profile, allowing operators to monitor temperature differences throughout the tank.
Stratification Monitoring
Continuous temperature profiling helps detect product stratification, an important consideration in cryogenic liquid storage. Emerson specifically describes the Rosemount 566 calibration option for stratification detection applications.
Custody Transfer and Inventory Management
Accurate temperature measurement contributes to tank inventory and net standard volume calculations when integrated with the appropriate Rosemount tank gauging system and transmitter.
Frequently Asked Questions
What is the Rosemount 566 used for?
The Rosemount 566 is a multiple spot temperature sensor designed for cryogenic and refrigerated storage tanks, particularly LNG and other liquefied gas applications.
How many temperature points can Rosemount 566 measure?
The Rosemount 566 supports up to 16 Pt-100 temperature elements, positioned at different heights in the storage tank.
What type of temperature sensor does Rosemount 566 use?
It uses Pt-100 platinum resistance temperature elements according to IEC 60751:2022. The Rosemount 566 uses Class A elements for cryogenic applications.
What is the temperature range of Rosemount 566?
The specified cryogenic liquid temperature range is -170 to +100 °C (-265 to +212 °F). The Class A thermometer specification is valid from -170 to +95 °C.
What is the accuracy of Rosemount 566?
The Class A Pt-100 accuracy is ±(0.15 + 0.002|t|) °C over the specified temperature range. An optional Callendar-Van Dusen calibration can provide ±20 mK uncertainty under the specified calibration conditions.
Can Rosemount 566 be used for LNG?
Yes. The Rosemount 566 is specifically designed for cryogenic applications such as LNG, and Emerson identifies it as a specialized sensor for cryogenic tank temperature measurement.
What transmitter is used with Rosemount 566?
The Rosemount 566 is connected to the Rosemount 2240S Multi-input Temperature Transmitter, which supports up to 16 three- or four-wire temperature elements.
What is the maximum sensor length?
The standard overall length is 5 to 70 m (16.4 to 230 ft). Other lengths may be available on request.
Is Rosemount 566 a single-point temperature sensor?
No. The Rosemount 566 is a multiple spot temperature sensor. Multiple Pt-100 elements are positioned at different heights to provide a tank temperature profile and average product temperature.
Can Rosemount 566 detect temperature stratification?
Yes. The multiple temperature elements allow continuous monitoring of the tank temperature profile. Emerson specifically provides a calibration option intended to support high-accuracy stratification detection in cryogenic storage applications.
