CRYO-DVT
High accuracy simultaneous Density and Viscosity metering for Cryogenic Fluids
- One probe for density, viscosity and temperature of cryogenic fluids.
- EX certified for explosive atmospheres down to -200 °C (-328 °F).
- Hermetically sealed for complete submersion in the tank.
- Purpose built for LNG tanks, terminals and transfer lines.
CRYO-DVT Overview
CRYO-DVT is a single, hermetically sealed probe that measures the density, viscosity, and temperature of liquefied natural gas and other cryogenic fluids directly in the tank or line, at temperatures as low as -200 °C (-328 °F). It was the first LNG density probe to achieve EX certification for operation at -200 °C, so it can be installed inside LNG equipment and in the explosive atmospheres around it.
Continuous, real-time density data lets terminal and storage operators detect stratification inside a tank and act before it develops into a rollover event. It can be mounted on a retractable system to build a density profile through the full depth of the tank.
The CRYO-DVT is made of full Titanium Grade 5 material, and thanks to its Balanced Torsional Resonator technology (BTR) is unaffected by external vibrations, which makes it perfect for any harsh condition and environment.
Process Connection
1″ NPT
Flange & custom connectors available
Density Range
0 – 1100 kg/m³
0.1 Kg/m3 Accuracy
Viscosity Range
0 – 20 mPa.s
0.001 mPa.s Accuracy
Temperature Range
-200 °C and above
PT1000 (class AA)
Pressure Rating
Up to 700 bar
(10,000 psi)
Wetted Material
Titanium Grade 5
Ingress Protection
IP69K
Hermetically sealed
EX Certification
EX ia IIC Tx Ca
Class 1 Div 1
Dimensions
Ø35 x 120 mm
Ø1.38 x 4.73 in
Unaffected by External Vibrations
Unaffected by external vibrations
Operating principle
CRYO-DVT uses a balanced torsional fork resonator with flattened tine ends, immersed in the fluid. The more viscous the fluid, the more the resonator is damped; the denser the fluid, the lower its resonant frequency. Rheonics’ proprietary algorithms calculate density and viscosity from these two values.
The coupled resonator design keeps the transducer perfectly balanced and mechanically isolated from its mounting. Rheonics’ gated phase-locked loop electronics track damping and frequency, giving stable, repeatable readings across the full range of temperatures and fluid properties.
CRYO-DVT Applications
Density in cryogenic environments
Accurate density, viscosity and temperature at -200 °C (-328 °F), from a probe certified for explosion safety in and around LNG equipment. Install it in tanks, fixed or retractable, and in transfer lines.
Stratification and rollover prediction
Real-time density in the tank reveals layering as it forms, giving operators the early warning they need to forecast and prevent potentially catastrophic rollover events.
Density profiles with retractable systems
Lowered through the tank on a retractable system, CRYO-DVT measures density at each depth to build a complete profile. It integrates into existing retractable systems.
Fixed array in tank
Retractable line in tank
Short probe in transfer line
Long probe in tank
Analysis and Acquisition Softwares
Insensitive to Mounting Conditions
Ruggedised electronics deliver accurate, fast and reliable measurements
Sophisticated, patented 3rd generation electronics drive these sensors and evaluate their response. Ultra-fast and robust electronics, combined with comprehensive computational models, make DVPs one of the fastest and most accurate in the industry. DVP gives real time, accurate density and viscosity measurements every second and is not affected by flow variations!
Process Control
- PLC Integration
- IP integration
- Standalone
Cloud based process control
- OPC UA
- JSON
- TCP/IP
Edge process control
- Analog Communication
- Digital Communication
- Integrated Webserver
Patented measurement system
Active ambient vibration suppression
Stable in high EMI process environments
One electronics measurement system for all product lines
SME-DRM
- 35mm DIN rail mount
- Extra-small form factor for easy installation
SME-TRD
- IP66 enclosures
- Onsite and remote installation of electronics head
- Available with rugged display for field use
SME-TR
- IP66 enclosures
- Onsite and remote installation of electronics head
HT-Electronics
- Available for operation to 210 °C
- Built for down-hole tools
- Only available in custom modules – 10 OTS
Multiple communication options available
Communication
Acquire data in real-time. Transfer it to your computer, PLC or upload to the cloud
Standalone IP66 rated boxes to integrate into your system.
Standard PCB to integrate in your equipment panel box.
Next generation electronics in sensor head.
RJ-45 Port, 4-20 mA, RS232 over USB.
CAN, Profinet, HART available.
4-20 mA
USB
Modbus TCP
Bluetooth LE 4.0
IO-Link
HART
SD Card
Webserver
Multi-Line Display
RS-485
RJ-45 Port
EtherNet/IP
CAN
Modbus RTU
Serial ↔︎ TCP/IP
Wireless support
Profinet
Certifications
ATEX
Certificate for Equipment and Protective Systems intended for use in Potentially Explosive Atmosphere – Directive 2014/34/EU
IECEx
Certificate issued as verification that devices, representative of production, were assessed and tested and found to comply with the IEC Standards listed in the certificate
cULs
Certifications comply with applicable UL and CSA safety standards, including UL 61010-1 and CSA C22.2 No. 61010-1
CE DoC
CE Declaration of Conformity for SME-TRD, SME-TR & SME-DRM as per EN 61326-1:2013, EN 61326-2-3:2013 & EN 50581:2012
Downloads
| TITLE | DESCRIPTION | LINK | CATEGORIES | PRODUCTS |
|---|---|---|---|---|
| LNG Density Measurement with CRYO-DVT Technology | This article explores the significance of LNG density monitoring and how the CRYO-DVT sensor stands out as an innovative solution, providing accurate and continuous density measurement in LNG tanks. | Download | Publication | CRYO-DVT |
| Introducing Rheonics latest advancement: Key facts to know | Our sensors now feature extended EX certification, ensuring top-tier safety and performance across a wide temperature range. From cryogenic lows to extreme heat, our sensors are designed to meet the rigorous demands of your operations. | Download | News | CRYO-DVT |
| CRYO-DVT Brochure | Single sensor for density, viscosity and temperature measurement of cryogenic fluids | Download | Brochures | CRYO-DVT |
| Oil and Gas Brochure | Downhole fluid identification, ESP and separator monitoring, pipeline pumping and interface detection, crude and fuel storage and petrochemical processing. | Download | Brochures | Oil and Gas |