[dsg-svt] SVT coolant pressure interlock

[Yuri Gotra]

Dear All,

Yesterday Bob installed the pump to resolve an issue with insufficient 
coolant flow at low temperatures caused by higher viscosity of the 
coolant and smaller diameter of the cooling tubes after switching to 
active sensor cooling setup. The new setup was successfully tested and 
it becomes the standard mode of operation. Coolant pressure and flow 
which were dropping substantially at low temperatures are much better 
now. Efficiency of the cooling system improved. So far we had to operate 
Lauda chiller at maximum pump speed, 6. Coolant pressure never exceeded 
8 psi. With new pump we have good flow with pump speed 3. To ensure 
detector safety we need to protect the cooling system against over 
pressure as now the pressure can go higher than 11 psi and it depends on 
the coolant temperature as before. Could you please add coolant pressure 
to the interlock system, same as implemented for the coolant 
temperature, both software and hardware interlocks. Thank you

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