Compact cryostat DXT90 series

liquid nitrogenvacuum

Liquid nitrogen cryostat - Electrical
The electrical liquid nitrogen cryostat is a vacuum cryostat designed for rapid cooling and stable temperature control of samples for electrical and electromagnetic measurements. It uses liquid nitrogen as the cooling medium, supports fast cooldown to cryogenic temperatures and can be configured with multiple electrical connector options and sample holder sizes.

Working principle
Fill the internal liquid nitrogen chamber; by adjusting the gap between the temperature control plug and the cold finger to control heat leakage and by adjusting heating output via the DXTC-290 temperature controller, the cryostat temperature can be swept rapidly between approx. 80 K–600 K and stabilized to a set value. With the pressure-reduction option, the cryostat temperature can be reduced to and stabilized at 65 K.

Features

• Temperature range: standard down to 65 K (typical ranges: 65–325 K or 65–500 K; optional up to 700 K).
• Fast cooling and high efficiency (cool-down times detailed in technical specifications).
• Sample placed in a vacuum chamber providing an ideal, stable experimental environment.
• Vacuum interlayer includes low-temperature adsorbent to extend vacuum holding time and liquid nitrogen usage time.
• PT100 platinum resistance thermometer for temperature sensing (good stability and repeatability).
• Multiple configuration options to meet different testing needs; convenient to add liquid nitrogen during use.
• Electrical sample holder with pluggable sample card and easy-to-use binding posts.
• Standard supply with 8 measurement leads; expandable up to 32 leads.
• Compact structure suitable for use with magnets for electromagnetic testing (resistivity, magnetoresistance, Hall effect, etc.).
• Customizable according to customer requirements.

Sample holder options

• DXT9015: 15 x 25 mm, material OFHC (standard electrical sample holder with 4 binding posts up/down).
• DXT9020: 20 x 30 mm, material OFHC.
• DXT9030: 30 x 40 mm, material OFHC.

Note: All standard electrical cryostats ship with one sample holder; additional or custom holders can be provided.

Cryostat electrical connector options

• DXT90-8P ordinary glass sintering — 8-pin quick-plug connector.
• DXT90-12P ordinary glass sintering — 12-pin quick-plug connector.
• DXT90-SMA — RF option: 0–18 GHz (with soft cable) or 0–12.4 GHz (with semi-rigid/semi-flexible cable).
• DXT90-BNC — 0–4 GHz with ordinary coaxial cable.
• DXT90-TRX — Triax connector (quick-plug triaxial connector option).
• DXT90-S — Stainless steel junction box option.
• DXT90-PTEF — PTFE wiring cover option (PTFE-insulated shell & connector to isolate electrical properties from shell).

Notes

• The standard electrical cryostat has two connectors at factory delivery: one for temperature sensor & heater, one for electrical measurement wiring. For additional measurement wiring, mounting holes or Breakout Boxes may be required.
• For low-temperature operation to 65 K, pressure-reduction accessories may be required (standard thermostat does not include special pressure-reduction means).
• 700 K high-temperature thermostat can be customized.

Technical specifications

• Model (series): DXT90 series (individual models: DXT9015, DXT9015H, DXT9020, DXT9020H, DXT9030, DXT9030H).
• Temperature range by model: DXT9015 / DXT9020 / DXT9030: 65–325 K; DXT9015H / DXT9020H / DXT9030H: 65–500 K. (Optional 700 K available on request.)
• Cooling time: ≤ 25 min (cool down to 80 K); ≤ 40 min (cool down to 65 K).
• Electrical connector: Standard 8-pin plug (expandable).
• Sample holder sizes: 15 x 25 mm (DXT9015), 20 x 30 mm (DXT9020), 30 x 40 mm (DXT9030).
• Thermometer: PT100 platinum resistance thermometer (supplied calibrated or uncalibrated; default uncalibrated).
• Temperature stability: ±0.01 K (depending on temperature controller).
• Heater options (per model variants): 30 W or 60 W heater options.
• Vacuum interface: Standard KF25.
• Sample environment: Vacuum.
• Required vacuum degree: ≤ 1 Pa is sufficient.
• Liquid nitrogen holding time: 6 h @ 80 K; 5 h @ 100 K; 3 h @ 200 K.
• Liquid nitrogen chamber volume: Standard 500 ml (customizable).
• Selection instructions summary: Electrical measurement cryostat is equipped with an electrical 8-core measurement connector (expandable to 32 cores). Wiring options include enameled wire, PTFE wire, low-temperature phosphor bronze wire, low-temperature coaxial wire, etc. Compact design suits magnet-assisted electromagnetic testing (resistivity, magnetoresistance, Hall effect).