Yokogawa SC42-SP34 Contacting Conductivity Sensor

Description:

The Yokogawa SC42-SP34 Contacting Conductivity Sensor is used a precision 2-electrode conductivity cell designed for continuous measurement of low-conductivity liquids. It belongs to the SC42 series, which supports a wide range of industrial process conditions with multiple materials and installation options. The sensor includes a pre-calibrated cell constant and integrated temperature element for accurate, temperature-compensated readings.

Applications:

The Yokogawa SC42-SP34 is used in industrial environments for continuous monitoring of conductivity in liquid processes. It is commonly deployed in boiler feedwater systems, reverse osmosis (RO), demineralized water systems, and chemical processing. Conductivity measurement is widely used as a reliable indicator of water purity and ionic concentration in process control.

Technical Specifications:

• Manufacturer: Yokogawa
• Model / Part Number: SC42-SP34
• Product Type: Contacting Conductivity Sensor (2-electrode)
• Measurement Range: ~0 to 400 µS/cm (low conductivity range)
• Cell Constant: 0.01 cm⁻¹ (pre-calibrated)
• Temperature Range: Up to ~150 °C (302 °F max)
• Pressure Rating: Up to ~10 bar (≈145 PSI typical)
• Temperature Element: Pt1000 integrated for compensation
• Materials: Stainless steel (316L) with PEEK insulation
• Mounting: Plug-in / flow cell or insertion fittings
• Connection: Variopin or Amphenol connector (system dependent)
• Function: Measures ionic conductivity and outputs signal to transmitter

Common Replacements:

• Yokogawa SC41-SP34 (similar low-range variant)
• Yokogawa SC42-SP24 (higher conductivity range)
• Yokogawa ISC40 (inductive sensor for high conductivity / low maintenance)