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Testing Thermistors as Liquid Level Sensors Kristy Lubinski 1.

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Presentation on theme: "Testing Thermistors as Liquid Level Sensors Kristy Lubinski 1."— Presentation transcript:

1 Testing Thermistors as Liquid Level Sensors Kristy Lubinski 1

2 Circuit Diagram #1 V 5 V PT Ω 2

3 Circuit Diagram #2 V 5 V PT Ω 3

4 Set-Up PT 1000’s 1 mm space 4

5 Boil Off Test Place PT 1000’s just into liquid Collect data while the liquid boils off Boil off rate measured separately – Liquid Nitrogen 0.2 mm/min – Liquid Argon 0.2 mm/min 5

6 Circuit #1 – Liquid Nitrogen 6

7 Circuit #2 – Liquid Nitrogen 7

8 Circuit #2 – Liquid Argon Trial 1 Both Out Both In One In 8

9 Circuit #2 – Liquid Argon Trial 2 Both Out Both In One In 9

10 Time Resolution Test Quickly place both PT 1000’s in liquid at 1:30 Quickly pull both PT 1000’s out of liquid at 2:30 Measure response time 10

11 Circuit #1 – Liquid Nitrogen Both Out Both In Both Out 11

12 Circuit #2 – Liquid Nitrogen Both Out Both In Both Out 12

13 Circuit #2 – Liquid Argon Both Out Both In Both Out 13

14 Two Jump Test Lower PT 1000’s into liquid Using only LabView Interface, stop apparatus when 1 PT 1000 is in liquid Repeat lifting out of liquid Verify location of PT 1000 visually 14

15 Circuit #1 – Liquid Nitrogen Both Out One In Both In 15

16 Circuit #2 – Liquid Nitrogen Both Out One In Both In 16

17 Circuit #2 Liquid Argon Both Out One In Both In 17

18 LN vs LAr LiquidBoiling Point (K) Density at B.P. (g/mL) Surface Tension at B.P. (mN/m) Nitrogen Argon

19 Level Test Three sets of PT 1000’s on outside of plexiglass cylinder ring Level using three strings that suspend the ring above liquid (like a puppet) 19 PT 1000’s Blue string used to hold ring up

20 20

21 Boil Off Test with Ring (not leveled) 21

22 Attempt to Level Resistors and then Boil off LN Trying to level ring by pulling on individual strings until one resistor was in the liquid and one was out of the liquid ~3.7 V 2. All three resistors around same level 3. Wiggled all three cords to see if they responded 4. Re-leveled all three and let sit to boil off liquid 5. Boil off points were different for all 3 sets, design set-up was not ideal, resistors were not all exactly 1 mm apart, not exactly on same location around the ring


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