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Yokogawa MICONDITIF3X4-4N
Product Introduction:
The MICONDITIF3X4-4N is an online conductivity/resistivity analyzer transmitter from Yokogawa’s MICONDITIF3 Series, featuring a 4-wire electrode connection that effectively eliminates lead wire resistance effects on measurement accuracy. It outputs a 4-20mA standard signal and is designed for continuous, reliable conductivity/resistivity measurement in water quality monitoring and chemical process control applications.
Detailed content
Technical Specifications:
| Parameter | Specification |
|---|---|
| Electrode Connection | 4-wire (4-wire system) |
| Measured Parameters | Conductivity / Resistivity / TDS (optional) |
| Conductivity Range | 0 to 2,000,000 μS/cm (auto multi-range switching) |
| Resistivity Range | 0.5 MΩ·cm to 2,000 MΩ·cm |
| Accuracy | ±1.0% FS (conductivity), ±1.5% FS (resistivity) |
| Temperature Compensation | Built-in Pt1000 temperature sensor, automatic compensation to 25°C reference |
| Output Signal | 4-20mA DC (2-wire/4-wire selectable) |
| Secondary Output | Relay output optional: 250V AC / 2A |
| Communication Interface | RS-485 (Modbus RTU protocol) |
| Power Supply | 100-240V AC (50/60Hz) or 24V DC |
| Power Consumption | Approximately 5W (AC), 3W (DC) |
| Operating Temperature | 0°C to +50°C |
| Protection Rating | IP65 (sensor connection head), IP20 (transmitter body) |
Material Composition:
- Transmitter Housing: PPS (Polyphenylene Sulfide) corrosion-resistant material
- Electrode Interface: PVDF or SUS316L Stainless Steel
- O-ring Seals: EPDM rubber
Structural Features:
- Wall-mount / pipe-mount installation design
- Integrated transmitter with sensor cable connection
- Front panel LCD display for on-site value viewing
- 4-wire electrode interface with independent current/voltage leads
Working Principle:
The MICONDITIF3X4-4N uses AC conductance measurement principle. An AC excitation voltage is applied to the electrodes, and the current flowing through the solution is measured. Conductivity is calculated using Ohm’s Law. In the 4-wire configuration, two wires carry the excitation current while the other two wires measure the voltage drop across the electrodes, completely eliminating lead wire resistance and contact resistance effects. The built-in temperature sensor measures solution temperature in real time, and a standard temperature compensation algorithm converts the measured value to a 25°C reference value.
Functional Features:
- Supports display of multiple parameters: conductivity, resistivity, TDS, salinity
- Automatic temperature compensation, compensation accuracy ±0.5°C
- Configurable conductivity/resistivity upper and lower limit alarms
- Supports online electrode constant setting (0.01 to 15.0/cm)
- Electrode fouling detection function
Advantages & Highlights:
- 4-wire measurement technology eliminates lead wire resistance errors, superior accuracy compared to 2-wire systems
- PPS housing resists acid and alkali corrosion, suitable for harsh chemical environments
- Automatic range switching, no manual adjustment required
- Long maintenance intervals, electrode cleaning cycle can extend to several months
Applicable Industries:
- Power industry: boiler feedwater/condensate conductivity monitoring
- Semiconductor: ultrapure water preparation process monitoring
- Chemical industry: online acid/alkali concentration monitoring
- Pharmaceutical industry: purified water/WFI conductivity testing
- Municipal water treatment: effluent water quality monitoring
Installation Requirements:
- Install in a location protected from direct sunlight and rain
- Sensor must be fully immersed in the measured liquid
- Minimum flow rate requirement: ≥0.3 m/s
- Maximum cable length: 30m (use repeater for longer distances)
- Grounding terminal must be reliably connected to earth ground
Usage Precautions:
- Clean electrodes regularly, recommended at least once per week (adjust based on water quality)
- Never run the electrode dry; this will cause permanent damage
- Calibration recommended every 3 months using standard conductivity solutions
- Re-set electrode constant when replacing electrodes
- Avoid prolonged use in solutions containing strong oxidizing agents
