The BL1A tunnel was accessed today to assess a faulty reading from the T1 cooling package inlet pressure transducer (T1P1).  The line was first bled to remove gas bubbles which did not change the reading.  The transducer was replaced with a new unit (OMEGA PX315-100GI).  The pressure reading returned to the usual value of approximately 74psi (faulty reading had been steadily decreasing over the last few months and was at approximately 36psi).

The supply lines for all T1 and T2 pressure transducers in the BL1A tunnel were bled, and the expansion tanks topped up.

This transducer was last replaced in May 2010.