1. ICARUS Internal Cryogenic Sensors
Purpose
This system provides a means of reading the temperature and liquid level sensors internal to the ICARUS cryostats.
Resistance Temperature Detector (RTD)
30 locations per T300 cryostat
Type Pt1000 in cryostat 1 Platinum RTD with R=1000Ω at 0°C
Type Pt10k in cryostat 2 Platinum RTD with R=10kΩ at 0°C
Provide interlock during initial LAr fill (Tmax−Tmin<50°C)
Monitor LAr temperature during normal operation
Resistive Level Meters (RLM)
4 locations per T300 cryostat (five 470Ω resistors per RLM)
Resistance lowers ~25% when immersed in LAr
Alert when nearing top during initial LAr fill
Monitor LAr level during normal operation
RTD Installation
RLM Installation

2. ICARUS Internal Cryogenic Sensors
Readout
Controlled by a PLC, Beckhoff CX performance CPU module, located on the mezzanine
Four control panels located on top of the cryostats, near the chimneys for RTDs and RLMs
Uses Beckhoff EL , universal RTD modules (resistance range 100Ω to 240kΩ)
Electrical isolation between panels for grounding
DC excitation current to sensors (low noise)
Connected to main cryogenic controls PLCs
Data accessible through iFIX HMI and saved in historian (same as all other cryo data)
OPC server makes data available over Fermilab network (i.e. can be read by EPICS)
System Layout
Control Panel

3. ICARUS Internal Cryogenic Sensors
Feedthrough Flanges
Using four feedthrough flanges from original installation, plus three new feedthrough flanges
All feedthrough flanges installed
Wiring Verification
Some wiring errors found (broken or shorted wires)
Wiring errors inside cryostats cannot be repaired; bad channels noted on drawing
5 RTDs in NE corner lost due to lost connector inside cryostat
1 shorted resistor on NE RLM
1 bad RTD (broken wire?) in SE corner
1 bad RTD (broken wire?) in SW corner
Readout Boxes
Assembled and completed safety review
To be installed inside racks housing TPC power supplies
Save space on top of cryostat
Test conducted to ensure noise will not affect TPC power supplies
Connector to Cold Side
of Feedthrough Flange

4. ICARUS Internal Cryogenic Sensors
Next Steps
Install readout boxes in the top of corner racks on top of warm vessel
First box expected to be installed today
Expect other three in next week
Route wires from boxes to flanges
Part of overall cryogenic system wiring
Expected over next couple weeks
PLC Programming and verification of sensor reading
Part of overall cryogenic system programming and commissioning
Expected over next three weeks