Microstat He Manual
Check that the heater voltage limit on the temperature controller is high enough. Normal settings are Limit: 40V, Resistance: 20Ω. Check
that the high temperature limit of the temperature controller has not been exceeded.
Check that the heater is not open circuit by checking from pins A to B. If so, the wiring will have to be repaired.
Cryostat will not reach base temperature
Check that the heater is switched off. Check that the flow rate is high enough, and that there is sufficient liquid in the storage dewar. If the
flow is high the liquid flow may be by-passing the cryostat.
Check that the transfer siphon nut is tight enough, and if so check that the PTFE seal has not been damaged.
Check the connections to the thermometer and make sure that it is working properly and in good thermal contact with the cryogen flow.
Check that you have not added too much heavy wiring to the sample holder, introducing a high heat load.
Check the quality of the vacuum in the OVC and in the transfer siphon.
Check the cryostat for mechanical damage. Warm it to room temperature and remove the OVC to check whether the radiation shield
touches the sample space or OVC.
Check that the radiation shield has been fitted correctly and that the sample or sample holder are not touching the radiation shield or OVC.
Sensor not reading correctly
Check the wiring.
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© 2017 Oxford Instruments Nanoscience MAN-MHE-1.1.0 (28ff3d8) Sep 2017 35
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