ATECH BC 970 - Description & Functions

SMART TDS & BOTTOM BLOWDOWN CONTROLLER
2. DESCRIPTION & FUNCTIONS
Typical application
Combi Automatic TDS Blowdown & Bottom Blowdown Controller BC 970, detects the electrical conductivity
(TDS - Total Dissolved Solids) of boiler water via the Conductivity Probes CP 950 or CP 930.
The TDS Blowdown Control Valve BCV 900 opens and closes in response to a high TDS signal from Combi Automatic
TDS/Conductivity Blowdown & Bottom Blowdown Controller BC 970. Keeps open until conductivity of the boiler
water drops. If the conductivty is lower than the set point the TDS Blowdown Control Valve BCV 900 remains closed.
Automatic Bottom Blowdown System ensures right and perfect bottom blowdown of precipitated solids at the bottom
of the boiler.
Please refer to "BCV 900 Installation and Operation Manual for Automatic TDS Blowdown Control Valve",
"CP 950 or CP 930 Installation and Operation Manual for Conductivity Probe" and "BCV 700 Installation and
Operation Manual for Automatic Bottom Blowdown Valve" for detailed information before assembly.
1- BC 970 TDS & Bottom Blowdown Controller 5- Valve
2- CP 950 or CP 930 Conductivity Probe 6- Check Valve
3- PC F20 Probe Connection Te 7- BCV 700 Bottom Blowdown Control Valve
4- BCV 900 TDS Blowdown Control Valve
IM-BC970-18F Page 4
BC 970
www.atech-ltd.com
Figure 1 Application of Automatic TDS Blowdown Control System / BCS 970
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