Yokogawa SC42-SP34 Contact Conductivity Sensor

Basic Overview

1. Core Model Code Definition

• SC42: Series general conductivity sensor
• S: 316L stainless steel wetted body
• P: Threaded insertion type, large bore flow cell structure
• 3: Cell constant = 0.01 cm⁻¹ (ultra-low conductivity dedicated)
• 4: 2-electrode measurement system

2. Key Technical Specifications

Measurement Performance

• Cell constant: 0.01 cm⁻¹
• Applicable conductivity range: 0.04 ~ 2000 μS/cm (ultrapure water, deionized water)
• Measuring principle: 2-electrode contacting method
• Built-in temperature element: DIN standard Pt1000 platinum resistance, automatic temperature compensation
• 90% temperature response speed: ≤ 1 min

Temperature & Pressure Rating

• Max continuous process temperature: 150°C (302°F)
• Nominal working pressure: 10 bar (142 PSIG)
• Ambient storage temperature: -20 ~ +70°C

Material (Wetted Parts)

• Sensor body & electrodes: AISI 316L stainless steel
• Insulation separator: PEEK (high temperature & chemical resistant)
• Sealing ring: Double EPR O-rings, double sealing structure for anti-leakage
• Electrical connector housing: Polyamide with gold-plated pins

Mechanical Dimensions

• Immersion length: 163 mm
• Overall total length: 193 mm
• Diameter: 36 mm
• Net weight: 600 g
• Process connection: Standard 3/4" MNPT external thread
• Electrical interface: 8-pin Variopin connector (supports SENCOM ID chip automatic identification)
• Matching cable: Yokogawa WU40 series dedicated sensor cableweb-material3.yokogawa.com

3. Main Advantages

1. Ultra-low cell constant 0.01 cm⁻¹, specially designed for high-purity water trace impurity monitoring
2. 316L stainless steel + PEEK insulation, resistant to high temperature and weak acid/alkali water medium
3. Integrated Pt1000 temperature sensor, transmitter realizes automatic real-time temperature compensation without extra thermal resistance
4. Double EPR sealing structure, stable under long-term high temperature liquid immersion
5. Built-in SENCOM identification chip, the analyzer automatically reads sensor parameters, no manual cell constant calibration
6. Large bore flow-through structure, not easy to accumulate dirt, suitable for pipeline continuous flow installation
7. Gold-plated 8-pin connector, stable signal transmission, anti-electromagnetic interference in boiler, water treatment workshops

4. Matching Instrument System

• Conductivity transmitter: SC4A, SC42
• Process analyzer: SA11-C1
• Installation accessories: FF40 flow-through holder, FS40 immersion fitting, FD40 flange assembly
• Signal cable: WU40 series shielded sensor cable

5. Typical Application Scenarios

• Boiler feed water, condensate water conductivity monitoring (boiler blowdown control)
• Ultrapure water / deionized water system in semiconductor, pharmaceutical factories
• Water treatment RO reverse osmosis, EDI equipment effluent purity detection
• Power plant thermal system water quality online monitoring
• Food & beverage purified water production line
• Central air conditioning chilled water, cooling water impurity monitoring