peter.king@LIGO.ORG - posted 13:22, Tuesday 14 March 2017 - last comment - 15:20, Thursday 16 March 2017(34811)
Flow sensors replaced
All four turbine flow sensors for heads 1-4 were replaced with new ones. The signals from
all four sensors look okay but the one from head 3 is the noisiest. Some air bubbles were
seen in the flow sensors but seemingly have worked their way out of the sensors by the time
the oscillator lid was put back.
Going by the froth in the crystal chiller spout, we might still have some air bubbles
in the system.
A large metal, copper coloured chip came out of the head 1 flow sensor. The chip was
approximately 2 mm x 2 mm.
The vortex flow sensors for the power meter and front end laser were re-attached and
released in Beckhoff - they were previously force written. If problems come up again, we
can force write them again.
The bypass valve is fully open.
Jason / Peter
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Comments related to this report
Given the colour of the chip, it is likely that it came from one of the following: i. the pump light block ii. the ASE block, or iii. the pump light monitoring block