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temperature_controll [2024/11/11 13:54] – vagelistemperature_controll [2026/05/08 09:17] (current) – [Water Chiller] simon
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 The non-toxic MRSG-110 refrigerant is used in the system, allowing for minimum temperatures around 110K. Lower values may be achieved by transitioning to a different refrigerant which most possibly will require modifications to the compressor. The thermal capacity of different available refrigerants can be seen in the following plot: The non-toxic MRSG-110 refrigerant is used in the system, allowing for minimum temperatures around 110K. Lower values may be achieved by transitioning to a different refrigerant which most possibly will require modifications to the compressor. The thermal capacity of different available refrigerants can be seen in the following plot:
  
-{:setup:temperature_controll:refrigeration_capacity.png?400 |}}+{{ :setup:temperature_controll:refrigeration_capacity.png?400 |}}
  
 The cryogenic system features no power or thermostatic control. Temperature regulation is achieved with a mixture of programmable power control and heater elements implemented at the attachment interface of the cryo-head. The cryogenic system features no power or thermostatic control. Temperature regulation is achieved with a mixture of programmable power control and heater elements implemented at the attachment interface of the cryo-head.
  
-^  Compressor Specifications                            ||| +^  Compressor Specifications                            ||^  Cryo-Cooller Specifications                                                      |||| 
-| Power Usage                 | Frequency  | 50 / 60 Hz   | +| Power Usage                 | Frequency  | 50 / 60 Hz   | Model                         ^  MR-90                         ^  MR-110  ^  MR-125  ^ 
-| :::                         | Voltage    | 220 - 240 V  | +| :::                         | Voltage    | 220 - 240 V  | Base Temperature              | < 90 K                         | < 110 K  | < 125 K  | 
-| :::                         | Power      | 750 VA       | +| :::                         | Power      | 750 VA       | Maximum Cylinder Temperature  |  355 K                                             ||| 
-| Dimentions                  | Length     | 356 mm       | +| Dimentions                  | Length     | 356 mm       | Cooldown Time                 |  ~3 hrs (to base temperature)                      ||| 
-| :::                         | Width      | 483 mm       | +| :::                         | Width      | 483 mm       | Weight                        |  7.1 kg (Expander)                                 ||| 
-| :::                         | Height     | 394 mm       | +| :::                         | Height     | 394 mm       |                                                                                   |||| 
-| :::                         | Weight     | 36.3 kg      | +| :::                         | Weight     | 36.3 kg      | :::                                                                               | :::                            | :::      | :::      | 
-| Typical Maintenance Cycle               || 10.000 h     |+| Typical Maintenance Cycle               || 10.000 h     | :::                                                                               | :::                            | :::      | :::      |
  
 =====Lakeshore Temperature Controller===== =====Lakeshore Temperature Controller=====
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 In this system we go with a Resistor 50 Ω 1% 60W to 220. Which sets the max power setting to 50 W and max current to 1 A. In this system we go with a Resistor 50 Ω 1% 60W to 220. Which sets the max power setting to 50 W and max current to 1 A.
  
 +===== Flowchart ===== 
 +
 +For better understanding on how the different components of the temperature subsystem are linked together, the following scheme is provided: 
 +
 +{{:setup:temperature_controll:temperature_system_flow_chart.jpg}}
 +
 +====== Cryotel Cryocooler ======
 +DARMA can also be operated by the **Cryotel CT**. It's datasheet and manual can be found here:
 +  * {{ :setup:temperature_controll:sunpower-cryotel-ct-datasheet.pdf |Datasheet}}
 +  * {{ :setup:temperature_controll:ct-inst--op-manual-rev-11.pdf |Manual}}
 +  * {{ :setup:temperature_controll:screenshot_2026-05-06_091304.png?400 |}}
 +
 +
 +===== Water Chiller =====
 +The Cryotel CT has to be water cooled to do this a Water Chiller, the SMC HRS-012 Water Chiller is installed. There exists the option for remote control through Rs-232C and RS-485. The corresponding manual and communication protocol can be found here:
 +  * {{ :setup:temperature_controll:om-communication_hrs012-018-024-030-040-050-060_en-o.pdf |Communication Protocol}}
 +  * {{ :setup:temperature_controll:om_hrs012-018-024_en-d.pdf |Manual}}
 +
 +
 +The HRS-012 uses a very specific, non-standard pin out for it's RS-485/232C communication. To match the pin out of it's serial to lan adapter (Moxa Nport 5130) a short adaoter cable is implemented.
 +The pin out of both the water chiller and the Nport is shown in the following pictures:
 +{{:setup:temperature_controll:serial_communication_pin_out.png?400|Pin out Water chiller}}
 +{{ :setup:temperature_controll:moxa_nport_5130_pin_out.png?400|Pin out Nport5130}}
temperature_controll.1731329662.txt.gz · Last modified: by vagelis

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