1. LN2 filling system 1.Filling the buffer tank 2.Filling the collector tube 3.Filling the detectors 4.Venting the collector tube 5.Monitoring then go to 1 or 2

2. 1. Filling the buffer tank Automatic? Alarm on the buffer tank to alert operators?

3. 2. Filling the collector tube Logic sequence: – Open VP – Open VIN – While FP wait for TP to get to LN2 value – Close VP

4. 3. Filling the detectors Logic sequence: – (VIN already open, VP closed) – Open VDi – Wait until TVi is at LN2 temp – Close VDi

5. 4. Venting the collector tube Logic sequence: – Close VIN – Open VP

6. 5. Monitoring Logic sequence: – Check P,V against alarm threshold ->Step 1: Fill the buffer – Check Tdi against limit value ->Step 2: Fill all the detectors – Check time since last fill ->Step 2: Fill all the detectors

7. Implementation – collector VIN 24V NI 9476 VP 24V NI 9476 NI 9217NI 9425 10 – 40 V DC NI 9217 Collector Safety Valve(s) NI 94761 + 1/column NI 94251 /column NI 92171 +1 24 V AC1 +1/column 10-40 VDC1/column

8. Implementation - detector VDi 24V NI 9476 NI 9217 Collector Safety Valve(s) NI 94761/detector NI 92171 24 V AC1 /detector Dewar TDi

9. Implementation – monitoring V Collector P NI 9217 NI 9425? NI 9217 NI 9425? Dewar Crystal NI 9217

10. Custom modules To NI 9217 PTi From NI 9476 12 V Power On/Off Open / Close Opened / Closed Powered Y/N To NI 9425 Read PT100 Distribute valve signal Command one valve 10-40 V DC Read flux sensors M1 M2 M3 M4 12V

11. M3 working principle 12 V Power On/Off Open / Close Opened / Closed Powered Y/N M3 12V NI 9476 Valve 12 V

12. Connection diagram Compact Rio Crate (6 x NI 9217, 1 x NI 9476, 1 x NI 9425) PT100 Prox M1 12V Prox M2 M3 Valve 12V? M4