Joule-Thomson Apparatus | ThermoFlux-28

Key Features

Key Features

• Joule-Thomson Apparatus Function: Determines Joule-Thomson coefficient for CO2 and N2 by gas expansion across a frit from overpressure to ambient pressure
• Pressure Range: 0 to 10 bar, gauge graduation 0.05 bar, operating overpressure up to 1 bar
• Glass Tube: Plastic-coated, 250 mm length, 46 mm diameter, enclosed in transparent plastic splinter-protection case
• Throttle Body: Housed inside the plastic-coated glass tube with two Pt-100 temperature measurement points
• Heat Exchanger: Copper capillary coil spiral, 37.5 m total length, 132 coils, reheats gas to ambient temperature before expansion
• Temperature Measurement: Digital instrument, 0.1°C resolution in differential mode, Pt-100 sensors
• Operating Condition: Room temperature, overpressure range up to 1 bar
• Accessories: 1 m pressure hose and hose clamps included
• Optional DAQ Software: ThermoFlux-28, National Instruments LABVIEW, Windows compatible, electronic sensors included

Experiments

• Determination of the Joule-Thomson coefficient of CO2
• Determination of the Joule-Thomson coefficient of N2
• Behaviour of real gas
• Intrinsic energy
• Gay-Lussac theory
• Throttling phenomenon
• Van der Waals equation
• Van der Waals forces
• Inverse of the Joule-Thomson effect
• Inversion temperature

Construction and Design

The Joule-Thomson Apparatus ThermoFlux-28 is built around a plastic-coated glass tube, 250 mm in length and 46 mm in diameter, which houses the throttle body and two Pt-100 temperature sensor measurement points. The entire glass section is enclosed within a transparent plastic case to provide protection against glass splinters during operation. A frame assembly carries the pressure gauge and a copper capillary coil spiral that serves as the heat exchanger. The copper coil extends 37.5 m in total length across 132 individual coils, providing sufficient thermal exchange area to reheat the inlet gas from the cooled state at the pressure-reducing valve back to ambient temperature before expansion.

Gas from the pressure cylinder passes through the heat exchanger, reaching system temperature before expanding across the frit from the measured overpressure to ambient pressure. The pressure gauge covers 0 to 10 bar with a graduation of 0.05 bar. The unit operates in an overpressure range of up to 1 bar and is designed for room-temperature use. Two Pt-100 sensors at defined positions on the tube measure the temperature differential across the throttle. The digital temperature measuring instrument displays readings to a resolution of 0.1°C in differential measuring mode, enabling precise determination of temperature change during gas expansion.

This Joule-Thomson apparatus is supplied with a 1 m pressure hose and hose clamps for connection to the gas supply cylinder. Optional DAQ software developed in the National Instruments LABVIEW environment supports automated data acquisition and calculation on any Windows operating system, with a set of electronic sensors included when this option is selected.

Software

ThermoFlux-28 DAQ Software (Optional)

Optional DAQ software for this Joule-Thomson apparatus is developed in the National Instruments LABVIEW environment. It measures and calculates experimental results automatically. A set of electronic sensors is included when the software option is selected. The software is compatible with any Windows operating system.

Scope of Delivery

• 1 experimental unit
• 1 instructional manual

Standards & Compliance

• Manufactured under ISO 9001:2015 Quality Management System
• CE Marking - European Conformity where applicable
• Supplied with calibration certificate, operation manual, and experiment guide
• 12-month manufacturer's warranty (parts & labour from installation)

Ordering & Delivery

• Incoterms: CIF to destination seaport, FOB Mundra/Nhava Sheva, or Ex-Works Ambala
• Lead time: 3–5 weeks production + sea transit to destination
• Payment: LC (Letter of Credit) or T/T bank transfer against proforma invoice
• Documentation: commercial invoice, packing list, bill of lading, certificate of origin, insurance certificate

Frequently Asked Questions

Q1: What gases can be tested with the Joule-Thomson Apparatus ThermoFlux-28?
The apparatus is designed for determination of the Joule-Thomson coefficient of CO2 and N2. Both gases are expanded across the throttle frit from measured overpressure to ambient pressure for coefficient determination.

Q2: What is the function of the heat exchanger on the ThermoFlux-28?
The heat exchanger, a copper capillary coil spiral of 37.5 m length across 132 coils, reheats the gas that has been cooled at the pressure-reducing valve of the gas pressure cylinder back to ambient temperature. This returns the gas to system temperature before each expansion measurement, ensuring consistent and repeatable starting conditions.

Q3: Why is the glass tube enclosed in a transparent plastic case?
The transparent plastic case encloses the glass section of the apparatus to provide protection against glass splinters in the event of breakage during operation. The transparent material allows full visual observation of the tube contents throughout experiments.

Q4: What temperature measurement resolution does the ThermoFlux-28 provide?
The digital temperature measuring instrument displays temperature to a resolution of 0.1°C when used in differential measuring mode. Two Pt-100 sensors are positioned at the measurement points on the plastic-coated glass tube.

Q5: Is optional data acquisition software available for the ThermoFlux-28?
Yes. Optional DAQ software developed in the National Instruments LABVIEW environment is available. It measures and calculates experimental results and is compatible with any Windows operating system. A set of electronic sensors is included when this option is selected.