Table of Contents

GRETINA LN filling system

PT 100 shack

det 0 (shack PT100) (Dewar PT100 ovl) (wall manifold PT100)

det29 (shack AC vent PT100) (shack PT100) (VME trigger crate 3V)

Status (July 2022)

LN supply ON (valve 2 in wall manifold) is c0.2/relay #1, i.e. open main supply to GRETINA with opv 1

NOTE: don't use 'cooldown' for manifold 0 (wall manifold). If bypass valve c0.3 is opened LN from the Dewar actually will flow back through valve c0.1 (even closed) into vent line, as Dewar pressure is higher the building supply pressure.

manifold ovl Pt100 ovl Pt100 #adc valve valve #relay
0 n.a. (back pressure) c0.3 2
1 c8.2 49 c11.1 32
2 c8.2 49 c11.1 32
3 c3.2 19 c12.7 46
4 c3.2 19 c12.7 46
detector LN ID ovl Pt100 ovl Pt100 #adc valve valve #relay manifold
Dewar 0 c30.1 180 c0.4 3 0
Q1 1 c8.1 48 c11.2 33 1
Q2 2 c7.1 42 c11.4 35 1
Q3 3 c6.1 36 c11.6 37 2
Q4 4 c4.2 25 c12.5 44 3
Q5 5 c7.2 43 c11.3 34 1
Q6 6 c6.2 37 c11.5 36 2
Q7 7 c5.2 31 c11.7 38 2
Q8 8 c4.1 24 c12.4 43 3
Q9 9 c9.1 54 c12.2 41 3
Q10 10 c9.2 55 c12.1 40 4
Q11 11 c3.1 18 c12.6 45 4
Q12 12 c5.1 30 c12.3 42 4
Wall Box description valve valve #relay
valve 1 building LN c0.1 0
valve 2 to Gretina c0.2 1
valve 3 DO NOT USE c0.3 2
valve 4 exhaust c0.4 3

filling buffer Dewar: opv 0 & opv 3

NEVER open wall box valve 3 (opv 2), LN from buffer Dewar is then released into vault via exhaust!

Connector-Channel map LNmap

Misc

part numbers (also liquid cooling)

  • LN sensor (new style): PR-10E-3-100-1/8-3. https://www.omega.com/en-us/temperature-measurement/temperature-probes/probes-with-lead-wires/pr-10/p/PR-10E-3-100-1-8-3 NOTE: since 2022 the custom 2.5“ are not made any longer
  • Tube to Pipe fitting for PT100 (Swagelok # B-200-1-4BT; 1/8 Tube X 1/4 NPT Bored thru), NOTE: thread for needs to be modified. photo of modified fitting: fittingpt100.jpg
  • Replacement Springs from Lee Spring Company :P# LP 020E 04 S316 the correct fit that will only allow 1-3 PSI max.
  • Valve for detector fill line ASCO Red-Hat II 8263G209LT
  • ASCO valve in main manifold box is 8222G002LT 24VDC
  • Repair kit for manifold valve is 306399 Repair Kit, see quote asco_kit.xlsx
  • 24V solenoid + kit 2019
  • O-ring bayonet (NSCL): Monroe Seals, 14 x 1.8 PTFE O-ring
  • Circular connector, box mount Amphenol MS3122E12-10S 85C4112
  • Circular connector, cable end plug Amphenol MS3126F12-10P 85C4131
  • Liquid Cooling: tubing is McMaster-Carr 5283K12 “High-Pressure Air Hose for Push-On Fittings” (LBNL says it's good not only for air)
  • Dry nitrogen connector: LEGRIS 9285 20 04

1. Brass International Standard ISO B Hose Coupling Size 1/4, Plug, 1/4 NPTF Female End https://www.mcmaster.com/#52495k61/=1cgistp

2. Brass International Standard ISO B Hose Coupling Size 1/4, Sleeve-Lock Socket, 1/4 NPTF Female End https://www.mcmaster.com/#52495k41/=1cgiszn

3. The Socket above is modified by turning and external threading the female end with this part: Long-Life Die Right-Hand Thread, 1-1/2” OD, M18 x 1.5 mm Thread Size https://www.mcmaster.com/#8294a65/=1cgivbz

4. This push connect is then threaded into the female NPT of the modified socket for re-insertion of the detector's stock red and blue cooling lines: Push-to-Connect Tube Fitting for Air & Water High-Temperature, Straight Adapter, 8mm Tube OD, 1/4 BSPT Male https://www.mcmaster.com/#5508k125/=1cgiw2f

5. Additional hose fittings for the McM# 5283K127 high pressure rubber hose:

Maintenance


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