Water Level TDS Probe

TDS Probe

Complete assembly, including probe and solenoid valve

Product Code



To manage a steam boiler for optimum efficiency and reliability an important requirement is to ensure that the Total Dissolved Solids (TDS) in the water are measured and controlled to not exceed a nominated level. It is generally accepted that for water tube boilers the level of TDS measured should not exceed 1,500 PPM by volume and for smoke tube boillers the TDS should not be higher than 2,500 PPM by volume. The figures stated are not definitive and in all applications the recommendations of the boiler manufacturer or water treatment chemist should be implemented.

The Autoflame System incorporates a temperature measurement sensor in the steam drum to establish the steam temperature. This data stream is used to constantly correct the conductivity value.

It also deals with the potential problem of polarization in the following manner. The probe measures any build up of voltage potential above or below earth or 0V in the water sample. The measured polarization voltage data is used to modify the conductivity calculation. The Autoflame System emits electrical energy at a rate of 10x 300 microsecond pulses every second. This translates into a method where we are emitting electrical energy for 0.6% of the sample time. All other manufacturers who use the frequency method are emitting electrical energy for 100% of the sample time. It follows that the polarization problem in these cases would be 167 times greater!

The TDS probe is designed so that the the turbulence created during the blowdown sequence will ensure that the probe remains effectively free of scale or deposited solids that could be held in suspension.