Reference 4
400/54 Premium Shielded NMR Magnet System Product Overview 59
Temperature Sensors — 400/54/ASP
Temperature sensors have been fitted to this system for use
on installation and for diagnostic purposes. Two sorts of
temperature sensors are fitted, Platinum resistor
thermometers and Allen Bradley temperature sensors.
Platinum resistor thermometers (PT100) are useful for
measuring temperatures between room temperature and 77K.
Allen- Bradley temperature sensors are more accurate at
lower temperatures (below 77K) to liquid helium
temperatures.
Platinum resistor thermometers (PT100)
These sensors have a nominal resistance of 100 Ohms at 0
°
C
(273K) which falls linearly to a typical resistance of 20
Ohms at 77K.
Allen-Bradley temperature sensors
Allen- Bradley temperature sensors are individually
calibrated, and are specific to each system.
Location of temperature sensors
The temperature sensors fitted to this system are outlined
below.
Table 6 Location of temperature sensors
Sensor type Location Access
Calibrated Allen
Bradley
Gas-cooled shield ABDE 10-pin seal on side of cryostat
PT100 Magnet baseplate EFHJ 10-pin seal 2 on helium turret (blue nut)
Uncalibrated Allen
Bradley
Magnet Baseplate KL 10-pin seal 1 on helium turret (black nut)
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