PT400 Tank Probes are durable, rugged and require no maintenance or calibration. They are constructed of solid steel rods connecting two or more steel and teflon bubble plates. The only moving parts in the probe are the siphon arrestor floats at the connection between the pneumatic hoses and the bubble plates.
The probe assembly comes complete with one or two IC temperature transducers. The temperature sensors are low current devices and are connected to intrinsically safe barriers at the instrument.
This single probe gives you all of the readings you require from one entry into the tank.