Spirax Sarco PLC - Blowdown Control via TDS; TDS Monitoring for Blowdown Valve Activation

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Manual control of the blow-down valve
The control of the Total Dissolved Solids (TDS) is carried out by a specic instrument (BC3250). It is installed
in the front panel and provides direct indication of the value of water conductivity. The same control can be
performed by another specic instrument (BC3150) installed inside the cabinet.
In this case the value of the water conductivity is indicated on the PLC display.
Two modes are provided: NORMAL mode during normal operation and ALARM mode when a condition of
maximum TDS is veried (Screen 17).
Once the alarm condition is removed, the mode returns to normal again.
In an alarm condition the general alarm lamp will light up.
It is necessary to remove the cause of the alarm before reopening the valve.
Screen 17