Oxford Instruments NanoScience MercuryiPS - Page 5

Operator's Manual
Issue 14 / Mar 2016
/ UMC0071
MercuryiPS
©2016 Oxford Instruments NanoScience. All rights reserved.
6.4.1 Overview ............................................................................................................................... 65
6.4.2 Adjusting a generic calibration file ........................................................................................ 65
6.5 Types of temperature sensor ........................................................................................ 67
6.5.1 Thermocouples ..................................................................................................................... 67
6.5.2 Metallic resistance thermometers (positive temperature coefficient) .................................... 67
6.5.3 Semiconductor resistance thermometers (negative temperature coefficient) ...................... 67
6.5.4 Semiconductor diodes .......................................................................................................... 68
6.5.5 Excitation current .................................................................................................................. 68
6.5.6 Calibration for different sensors ............................................................................................ 69
6.5.7 Available generic calibration files .......................................................................................... 70
6.6 More about thermocouples ........................................................................................... 71
6.6.1 Thermocouple principles ....................................................................................................... 71
6.6.2 Configuring for thermocouples .............................................................................................. 71
6.6.3 Reference junction compensation ........................................................................................ 73
6.6.4 External reference junctions ................................................................................................. 73
7 CRYOGEN LEVEL-METER ............................................................................................... 75
7.1 Principles of operation .................................................................................................. 75
7.1.1 Operation of the board with a helium-level probe ................................................................. 75
7.1.2 Operation of the board with a nitrogen-level probe............................................................... 76
7.1.3 Why different methods are used for the two liquids .............................................................. 76
7.2 Installing the level-meter board ..................................................................................... 76
7.2.1 Removing the top cover ........................................................................................................ 76
7.2.2 Fitting the board .................................................................................................................... 77
7.2.3 Basic check of board operation............................................................................................. 79
7.3 Connecting the level probe ........................................................................................... 79
7.4 Configuring MercuryiPS for helium level meter ............................................................. 79
7.5 Configuring MercuryiPS for nitrogen level meter ........................................................... 81
8 MANAGING YOUR MERCURY ......................................................................................... 84
8.1 General ........................................................................................................................ 84
8.2 Display ......................................................................................................................... 86
8.3 Devices ........................................................................................................................ 88