Vacuum cryostat DXT91 series

compactliquid nitrogenstainless steel

Liquid Nitrogen Cryostat - Optics is an optical cryostat designed for spectroscopy and photoelectric experiments, providing a vacuum sample environment and rapid cooling using liquid nitrogen.
Working principle

• The low-pressure refrigerant enters the cryostat via the liquid inlet and is introduced into the evaporator at the bottom through an internal capillary tube. A heater and temperature sensor are installed on the evaporator. Temperature-controlled vapor is sprayed into the sample chamber to cool the sample; exhaust vapor is released to the atmosphere or a gas recovery device. The sample can be loaded from the top using a sample rod. The bottom uses a compact vacuum cover design, making it suitable for measurements in magnetic fields.

Features

• Temperature range 65K–500K (optional up to 700K); high efficiency and fast cooling speed.
• Sample located in a vacuum chamber for an ideal, stable experimental environment.
• Vacuum interlayer equipped with low-temperature adsorbent to increase vacuum holding time and extend liquid nitrogen usage time.
• PT100 platinum resistor temperature sensor for good stability and repeatability.
• Multiple configuration options to meet different testing needs.
• Convenient liquid nitrogen replenishment during use.
• Optical sample holder can be equipped with a pluggable sample card and user-friendly binding posts.
• Customizable according to user requirements.
• Comes standard with 8 measuring leads, expandable to 32.
• Standard window configuration: two fused quartz windows (expandable to five); window material can be changed per requirement.
• Quick sample changes (can be completed within 5 minutes).
• Available sample holder types: liquid, powder/dust, solid and block holders.

Sample holder options

• DXT9115-4W — 15 × 25 mm, OFHC, standard optical sample holder.
• DXT9115-4W-10LTH — 15 × 25 mm, OFHC, standard optical holder with Φ10 mm hole.
• DXT9115-4W-H-10LTH — 15 × 25 mm, OFHC, standard optical holder with Φ10 mm hole.
• DXT9120-4W — 20 × 30 mm, OFHC, standard optical holder (no hole).
• DXT9120-4W-15LTH — 20 × 30 mm, OFHC, standard optical holder with Φ15 mm hole.
• DXT9120-4W-H-15LTH — 20 × 30 mm, OFHC, standard optical holder with Φ15 mm hole.
• DXT9130-4W — 30 × 40 mm, OFHC, standard optical holder (no hole).
• DXT9130-4W-20LTH — 30 × 40 mm, OFHC, standard optical holder with Φ20 mm hole.
• DXT9130-4W-H-20LTH — 30 × 40 mm, OFHC, standard optical holder with Φ20 mm hole.
• DXPSC-10 — Φ10 mm quartz powder sample container (powder container with 10 mm quartz window on one side).
• Remark: All standard optical cryostats ship with one sample holder; additional/custom holders can be provided on request. Pressing plate included to fix optical samples; its aperture matches the light hole.

Cryostat optical / electrical connector options

• DXT91-8P ordinary glass sintering — 8-pin quick-plug ordinary electrical connector.
• DXT91-12P ordinary glass sintering — 12-pin quick-plug ordinary electrical connector.
• DXT91-SMA — options: 0–18 GHz with soft cable; 0–12.4 GHz equipped with semi-rigid and semi-flexible cables.
• DXT91-BNC — 0–4 GHz with ordinary coaxial cable.
• DXT91-TRX — triax connector (quick-plug triaxial connector available).
• DXT91-S — stainless steel junction box (shell and wiring board integrally grounded).
• DXT91-PTEF — PTFE wiring cover option (PTFE insulating board in shell; housing and connector electrical properties independent).
• Remarks: Cryostats leave factory with two connectors (one for temperature sensor/heater, one for other measurements); additional test lines may require mounting holes or breakout boxes. For operation to 65K, corresponding pressure reduction accessories are required.

Caractéristiques / spécifications techniques

• Models: DXT9115-4W, DXT9115-4W-H, DXT9120-4W, DXT9120-4W-H, DXT9130-4W, DXT9130-4W-H (DXT91 series).
• Temperature ranges by model: DXT9115-4W / DXT9120-4W / DXT9130-4W — 65–325 K; DXT9115-4W-H / DXT9120-4W-H / DXT9130-4W-H — 65–500 K. (Standard shipping temperature range 80K–500K; expandable to 65K–500K.)
• Cooling time: ≤ 25 min.
• Optical window (standard): four windows — sizes depend on model (examples in product table: Four Φ15×1.5, Four Φ20×1.5, Four Φ30×1.5 depending on model).
• Test lead connector: standard 8-core measurement lead connector; optional coaxial and microwave connectors; breakout or additional connectors possible.
• Sample environment: sample placed in vacuum.
• Vacuum interface: standard KF25 interface.
• Vacuum degree: ≤ 1 Pa is sufficient.
• Thermometer: PT100 platinum resistance thermometer (both calibrated and uncalibrated available; default uncalibrated).
• Temperature stability: ±0.01 K (depends on DXTC-290 temperature controller).
• Heater: available 30 W or 60 W variants (model-dependent).
• Liquid nitrogen maintenance time: example values — 6 h @ 80 K; 5 h @ 100 K; 3 h @ 200 K.
• Liquid nitrogen chamber volume: standard 500 mL (customizable).
• Application scope: spectral testing, photoelectric reaction, Raman, electroluminescence, photoluminescence, etc.