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Flow Cryostat Temperature Controller PVC-100 “Flow SHOGUN"

PDF PVC-100 Flow SHOGUN TOP-img

Key Features

- Linear flow valve control maintains a stable 1 K pot temperature
- PID feedback automatically regulates refrigerant flow to match the setpoint
- Optimized low flow operation extends cryogen holding time
- Excellent temperature stability ensures reliable STM performance
- Simple and flexible temperature control via setpoint adjustment

Working Principle

The USM1400 is equipped with a main cryostat that stores liquid refrigerant internally.
The refrigerant is supplied to the 1 K pot (sub-cryostat) by gas pressure, cooling the STM stage as the 1 K pot temperature decreases.
When the refrigerant supply rate is increased, liquid accumulates in the 1 K pot, resulting in a cooling mode similar to a conventional bath cryostat (left figure).
In contrast, when the supply rate is reduced, the 1 K pot is filled with gas and operates as a flow cryostat (right figure).

PVC-100 Flow SHOGUN Key Features-img1

PID-Controlled Flow Regulation

This flow cryostat controller is designed to precisely regulate temperature during gas cooling operation.
A proportional valve is integrated into the controller, with its opening controlled by an external analog voltage input.
As illustrated in the conceptual diagram, the controller functions like a faucet, regulating the gas flow rate to maintain a constant temperature.
In operation, the valve opening is driven by the PID output from the temperature controller, enabling automatic adjustment of the flow rate so that the 1 K Pot reaches and maintains the user-defined setpoint.

PVC-100 Flow SHOGUN Key Features-img2

Helium Flow Control Performance

①: Rapid cooling of the 1 K pot with 100% valve opening
②: Valve opening adjusted via PID control to reach 7 K at the 1 K pot
③: Stable maintenance of T1 K pot at 7 K as helium level decreases

Temperature control by helium flow control (Setpoint : 7 K)-img

Temperature Stability Comparison (LHe)

Control by FVC-100 (Setpoint : 8 K)-img Control by FLOW SHOGUN (Setpoint : 6 K)-img

Temperature Control Performance (LN2)

  • Rapid response to setpoint changes, reaching target temperature within ~1 hour
  • Stable temperature control even under low nitrogen gas flow conditions
  • Reduced flow extends liquid nitrogen holding time, similar to helium operation
  • No liquid nitrogen storage required, enabling quick transition to helium operation

    • Variable Temperature Control (Cryogen : liquid nitrogen)-img

    Comparison with Previous Model

    PVC-100/Flow SHOGUN(New model)-img FVC-100(Previous model)-img
    Product Name PVC-100/Flow SHOGUN
    (New Model)    		 FVC-100
    (Previous Model)
    Valve Control 0 ~ 100 %
    (Continuously)    		 Digitally Open/Close
    (On/OFF)
    Usability/
    Purpose    		 Fully Automated/
    Long Term STM    		 Manual Settings/
    Temperature Maintained in
    Stand-by Mode
    Temperature
    Stability    		 ΔTFluctuation < 30 mK ΔTFluctuation ~ 100 mK
    Helium
    Consumption
    from 1 K pot    		 Automatically Minimized Manual Control

    Components

    PVC-100 PVC-100 Main unit-img
    Power Supply Cable(AC ‐ DC Converter) Power Supply cable-img
    BNC Cable with Connector and 40 kPa Overpressure Valve BNC cable with connector end-img
    * Please note that delivery and installation services are not included with the purchase.

    Setup Configuration

    Setup Configuration1-img
    Setup Configuration2-img

    Specifications

    Product Name Flow Cryostat Temperature Controller
    (PVC-100, Flow SHOGUN)
    Applicable System USM1400*
    * Not compatible with early USM1400 models without a 1 K pot
    Controllable Temperature Range 84 K ~ 100 K (LN2)
    6 K ~ 20 K (LHe)
    * Lower temperature limit depends on thermal configuration (especially in LHe operation)
    * Higher temperatures are possible with heater activation
    Temperature Fluctuation
    (1 K pot)    		 < 30 mK guaranteed
    * < 10 mK achievable
    Temperature Controller Cryocon 22C / Lakeshore 335

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