3 Water Level Control
04.09.2016 Mk8 MM Expansion Features Installation and Set-Up Guide Page 47
3.5 2
nd
Low Probe
3.5.1 Overview
The 2
nd
low probe is a conductivity probe, and its purpose it to act as an additional 2
nd
low water cut-off
when the water falls too low in the boiler. The conductive technology with safe electronic control has
been granted a worldwide patent for its continuous electrical and mechanical self-checking software.
If the water level in the boiler falls below probe, then the 2
nd
low water level alarm will occur. The
water level may be low due to insufficient water in the feed water tank, feed water pump failure, feed
water line isolated and/or the level controls have failed. If there is not enough water in the boiler, the
heated tubes will be left exposed and unable to cool down as there is no longer water to transfer the
heat to. If the burner were to continue firing, the temperature of the tubes would be rapidly increase,
reducing the metal strength, and could cause a collapse or explosion. On the MM system, the 2
nd
low
water level alarm will shut down the burner. The probe can be cut to length to suit the application.
Figure 3.5.1.i 2
nd
Low Probe
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