1. Gaseous N2 -196⁰C Vacuum Liquid N2 -196⁰C Radiation shields Outer wall
cryogenic vessel
(12mm Aluminum)
Vacuum vessel
(Stainless steel)
Inner wall
cryogenic vessel
(15mm Aluminum)

2. Phase Separator CryoLink Legend exhaust cryogenic control valve
TT07
exhaust
CV01
Heater
LT01
PT02
PT01
Safety valve
DT01
DT02
LT03
LT02
Phase
Separator
CV02
TT06
TT03
Legend
TT05
TT02
cryogenic
control valve
capacitive
level sensor
TT04
TT01
Pt100 temperature
transmitter
CryoLink
pressure
transmitter
displacement
transmitter (LVDT)

3. PID-loop
Ph-Separ.
Setpoint
PID-loop
CryoLink
Setpoint
Setpoint
PID-loop
Heater
LT01
TT07
CV01
PT02
CV02
Phase
Separator
Liq N2 storage tank
CryoLink

4. connector for C-type module
RT-program
boolean inputs
numerical inputs
boolean outputs
numerical outputs
cRIO
Chassis+
RT-PC
SW-defined
Inputs/Outputs
FPGA
driver for
C-modue
C-type
module
C-type
module
C-type
module
C-type
module
C-type
module
Free slot:
connector for C-type module
C-type modules
connected to FPGA

5. Expert User Interface RT-system Modbus Tango FPGA (not mandatory)
network
streams
shared
variables
RT-system
Modbus
Tango
read indicators
write controls
‘pet’
watchdog
logging
FPGA
sensors
actuators

6. 19” cabinet CryoLink controls Phase-separator 2x Press.Air
P-Controller
cRIO Controller
CryoLink controls
Control panel
(Mains switch, overall status)
24V ok
cRIO ok
PhaseSeparator ok
CryoLink ok
4A slow
24V power supply
(19” mounting adapter)
Nikhef
Blind panel
19” cabinet
CryoLink controls

7. PhaseSep. & CryoLink input Expert User Interface FPGA RT- program
Simulation?
FPGA
Simulation
code
input
RT-
program
output
Shared vars
Simulation

9. ‘Connect’ button
Click to select CryoLink Controls system

10. State outgoing Interlocks
‘Connected?’ indicator
State incoming Interlocks
Name connected CryoLink
Operational State Phase-Separator
State outgoing Interlocks
%Power & Temp Heater
Conditions of logic for Level-control
(enabled/disabled, running/not active)
Go-to ‘Operation’/Bakeout
Level-
indicators
Settings of the three PID-controllers
(the Heater control on the other Tab)
PT100 temp-sensors cryogenic vessel
Operational State Phase-Separator

11. Logic for “Level control PID-controllers”
PID-ctrl’s running? T
(running) F
(not running)
Not running
by error?
PID-ctrl ‘Auto’? T F T F
Level PID-ctrl disabled
Level PID-ctrl switched off
PID-control output (CV01, CV02)
Manual control output (CV01, CV02)
AND of Incoming Interlocks = False or
RT-program error
Reset required!
Cmd <Go to Bakeout> = TRUE or
Cmd <Stop liqN2 supply> = TRUE
(running PID-controllers can
individually be set to ‘Auto/Manual’)
CV01, CV02 both closed (setting = 0%)