Offering on/off and continuous process control, the Type 8205 pH controller combines a flat glass sensor and PID-controller/display within a single, splash-proof, plastic NEMA 4 enclosure. It can be integrated with the sensor or remote via a panel or wall mount. As an added feature, the pH controller indicates when the probe is 50% and fully expired when calibrating. The fittings are available in stainless steel, brass, PVDF, PP and PVC, with process connections that include threaded, TriClamp, true union and sanitary. The Type 8205 features a 4–20-mA output signal of actual pH value, plus a choice of relay, transistor or triac pulse outputs for base and acid injection. In addition, a separate dedicated alarm output relay is included that can be used as an interlock function to prevent out-of-specification discharge, or as a low/high pH alarm. Outputs vary in frequency/duration according to user-defined parameters and pH value setpoint. Chemical-specific pH titration curves can be programmed into the unit.
