SPS21
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ADCA CONDUCTIVITY PROBE SPS21 DESCRIPTION The ADCATrol SPS21 conductivity probe is typically used in steam applications to measure the conductivity of superheated boiler water, condensate or feedwater. The probe is used in conjunction with an ADCATrol BCS controller and a VPC series TDS blowdown control valve. Water contains impurities in the form of dissolved solids and solids in suspension, whose concentration increases during vaporization. Water treatment can reduce impurities to a certain degree, however these are not completely eliminated and, in certain conditions, might even increase. As steam production starts, there is an undesirable increase in boiler water TDS (Total Dissolved Solids) concentration. If not taken care of, the high concentration can lead to problems such as water foaming, reduced boiler performance and wet steam. Contamination of the steam may occur, resulting in system damage further ahead, such as corrosion, scaling, salt incrustations on heat transfer surfaces, among other problems. Furthermore, the high concentration is harmful and is not acceptable in applications where steam is used for treatment of food, drinks and in sterilization processes. For these reasons, a certain amount of boiler water must be discharged continuously or periodically to ensure TDS concentration is kept within the recommended parameters. MAIN FEATURES Compact stainless steel construction. IP 65 protection. Wide ambient temperature range up to 100 ºC. OPTIONS AND ACCESSORIES: USE: AVAILABLE MODELS: Sensor chamber for sandwiching between flanges as per EN 1092-1 or ASME B16.5. Measure conductivity of superheated boiler water, condensate and feedwater. SPS21. SIZES: CONNECTIONS: Installation in pipes via a sensor chamber. See IMI – Installation and maintenance instructions. VALSTEAM ADCA We reserve the right to change the design and material of this product without notice.

ADCA TECHNICAL DATA Maximum operating pressure Maximum operating temperature Maximum ambient temperature Minimum distance to other metallic surfaces Cable entry * Optional. ** Probe only, without sensor chamber. MATERIALS Probe housing Stainless steel Stainless steel SPS21 conductivity probe Compression fitting for sample collection * Electrical connector Sealing ring Remark: Probe can be fitted onto a “T” connection or onto the F2132 sensor chamber, providing that it is always in contact with water and wetted parts fully immersed, without air gaps. Any metallic parts near the probe must be...

ADCA TYPICAL APPLICATIONS INSTALLATION WITH PROBE FITTED IN THE BOILER BLOWDOWN LINE (INLINE MEASUREMENT) The VPC series TDS blowdown control valve is programmed to open periodically, in order to purge a certain amount of water and enable a representative sample of boiler water to reach the probe at saturated temperature. The probe will then measure the electrical conductivity of the boiler water and the controller will compare it with the defined setpoint. If the measured value is below the setpoint the valve will close, otherwise it is kept open until the condition is satisfied. To avoid...