[Dsg-rich] RICH gas panel test results

[Marco Contalbrigo]

Pretty impressing body of work. Thank you, Marco.

On Mon, 14 Aug 2017, Tyler Lemon wrote:

> Hello,
> 
> This morning Mindy, Marc, George, and I tested the RICH gas panel. Both the
> nitrogen purge instrumentation and air cooling instrumentation were tested.
> 
> For the nitrogen purge system, we connected the nitrogen dewar to the gas panel.
> Initially, we were not able to get over 4 liters per minute (L/min) of nitrogen
> flow as the dewar was not a high-pressure dewar, as ordered. George has already
> arranged for the correct, high-pressure dewar to be delivered on Wednesday August
> 16. After noting the dewar was a low-pressure dewar, we swapped the installed
>  pressure regulator with an orifice for a regulator without an orifice. The new
> regulator without the orifice allowed the nitrogen flow to be set to ~15 L/min. We
> set the nitrogen flow to 6 L/min and measured the temperature of the gas on the
> very end of the gas line in EEL 124 cleanroom. The output nitrogen temperature at
> the end of the gas line was ~69 degrees Fahrenheit. The ambient temperature of EEL
> 124 was ~72 degrees Fahrenheit.
> 
> For the air-cooling system, we connected the air lines to the gas panel. We set the
> compressor to automatically turn off if its output pressure reached 70 psi and to
> automatically turn on if its output pressure drops to 58 psi. The values set on
> manual instrumentation and the values measured by the mass flow meter are in the
> table below. To get the flow output to be higher, we had to also increase the
> pressure to the rotameter using the manual pressure regulator.
> 
> Manual Pressure Regulator [psi]
> Manual Rotameter [L/min]
> Mass Flow Meter Measurement [L/min]
> 30
> 200
> 200
> 50
> 300
> 300
> 60
> 400
> 350
> 
> We were not able to get 400 L/min when the manual rotameter was set to 400 L/min.
> We tried increasing the output pressure at which the compressor turns off from 70
> psi to 75 psi, but the pressure at the manual pressure regulator did not go above
> ~60 psi and the measured flow above ~350 psi. If during the cooling tests, 350
> L/min is not enough to sufficiently cool the electronic panel, we could further
> adjust the output settings of the compressor to try to reach 400 L/min.
> 
> Best regards,
> Tyler
> 
> 
>