TWP/SKYRAD/C1  - IRT failure

A moisture related fault was found in the IRT cable after a day of very heavy rain. The 
cable was replaced but the internal power supply was apparently damaged. The instrument was 
replaced with a spare IRT.

• Sky Infra-Red Temperature Minima(sky_ir_temp_min)
• Sky infrared temperature, standard deviation(sky_ir_temp_std)
• Sky Infra-Red Temperature(sky_ir_temp)
• Sky Infra Red Temperature Maxima(sky_ir_temp_max)