American Magnetics 135 & 136 Liquid Helium Level Instruments (CE-Marked) - Manual (Page 7)

Rev. 3 iii
Table of Contents
1 Introduction .............................................................................. 1
1.1 Model 135/136 Features............................................................ 1
1.2 Model 135 Front Panel Layout ............................................... 3
1.3 Model 135 Rear Panel Layout ................................................ 4
1.4 Model 136 Front Panel Layout ................................................ 5
1.5 Model 136 Rear Panel Layout ................................................. 6
1.6 Model 135/136 Specifications @ 25 °C ...................................... 7
2 Installation ................................................................................ 9
2.1 Unpacking the Instrument ....................................................... 9
2.2 Rack Mounting the Instrument.............................................. 10
2.3 Preparing the Sensor for Connection ..................................... 10
2.4 Installing the Optional Solenoid-Operated Fill Valve .......... 12
2.5 Connecting any Communications Option .............................. 12
2.6 Connecting the Instrument to Power ..................................... 13
3 Operation ................................................................................ 15
3.1 Sensor-Burnout Protection Mode ........................................... 15
3.2 Normal Operational Mode ...................................................... 15
3.2.1 Turn on the power ....................................................... 15
3.2.2 Configure the active length setting ............................ 16
3.2.3 Configure the HI SETPOINT and the
LO SETPOINT............................................................. 16
3.2.4 Configure the A SETPOINT and the B SETPOINT .. 17
3.2.5 Select the operational mode of the controller
output receptacle ......................................................... 18
3.2.6 Configure the sample time interval setting ............... 19
3.2.7 Select either continuous or sampled update
configuration ................................................................ 19
3.2.8 Select the appropriate units display option ............... 19
3.2.9 Connect the optional analog output signal ................ 19
3.3 Dirty Sensor Operational Mode.............................................. 20
4 Remote Interface Reference.................................................. 21
4.1 Serial Communication/Data Logger Option .......................... 21
4.1.1 Serial port connector and cabling ............................... 21
4.1.2 Command/return termination characters .................. 21
4.1.3 Serial Communication DIP Switch Settings.............. 22
4.1.4 Serial Command Set Reference .................................. 24