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Interlock board

Inputs:

• HTM2500LF temperature+humidity sensor inside Lexan box
• Flow switch in cooling system return line
• RS-232 connection to chiller - status, set T, measured pressure/flow/T

Thresholds:

• Ambient T inside SVT Lexan box < 25 C (set in Arduino script)
• Ambient RH inside SVT Lexan box < 5 % (set in Arduino script)
• Cooling system flow > 20 GPH (adjustment screw on flow switch)

Logic:

• Check inputs every 1 s; if any input is abnormal, trip and stay tripped (must reset Arduino board to clear)

Outputs:

• RS-232 to chiller: if tripped, send "stop" command every 1 s
• Interlock to CAEN crate (5V normal, 0V tripped) - trip turns off all outputs immediately