Product Short Description
Product Brief Introduction
Combined paperless data recorder and single-loop PID process controller unit manufactured by Yokogawa; model suffix 4-2 defines hardware configuration: 4 universal analog input channels, 2 relay digital output control channels. Unit integrates continuous process data logging and closed-loop temperature/pressure flow regulation for small-scale industrial process systems, compliant with IEC 61010-1 safety standards.
Description
Technical Specifications
- Universal Analog Input Count: 4 channels (thermocouple, RTD, 4–20 mA DC, 0–10 V DC compatible)
- Digital Relay Output Count: 2 channels SPST relay contacts, 5 A / 250 V AC rated load
- PID Control Algorithm: Single-loop auto-tuning proportional-integral-derivative control with anti-windup protection
- Display Interface: 3.5-inch color TFT LCD touch screen operator interface
- Data Storage Medium: Internal 4 GB non-volatile flash memory for continuous process logging
- Logging Sampling Interval Range: 1 second to 60 minutes configurable
- Communication Interfaces: RS485 Modbus RTU, USB data export port
- Main Supply Input Voltage: 100–240 V AC universal wide-range power supply
- Ambient Operating Temperature: 0 °C to +50 °C
- Panel Cutout Mount Dimensions: 92 mm width × 92 mm height standard square panel form factor
- Front Panel Environmental Rating: IP54 dust and splash resistant seal
Functional Features
- Auto-tuning PID algorithm automatically calculates proportional, integral and derivative control parameters
- Multi-type universal analog input natively supporting all standard industrial temperature and process sensors
- Real-time trend graph display with zoom and scroll historical logged data functionality
- High/low process value alarm function with relay output alarm trigger assignment
- USB offline data export for process audit and quality compliance reporting
- User-configurable unit engineering scales (°C, °F, bar, m³/h, kPa customizable)
- Front panel password protected parameter access to prevent unauthorized configuration modification
Material Composition
- Front Panel Frame: ABS flame retardant UL94-V0 plastic with silicone sealing gasket
- Internal Main PCB: FR4 industrial grade high-temperature circuit substrate
- LCD Touch Screen Layer: Capacitive touch sensor with tempered glass protective overlay
- Output Relay Contact Material: Silver tin alloy anti-arcing contact tips
- Rear Terminal Block Housing: Reinforced PBT high temperature resistant plastic
Structural Characteristics
- Standard 92×92 mm square panel cutout flush mounting structure
- Split two-part construction: sealed front display control panel, rear wiring terminal compartment
- Spring-loaded panel mounting clamps included for cabinet cutout installation without fastener hardware
- Rear terminal block segmented grouping: power terminals, analog input terminals, relay output terminals, communication terminals
Working Principle
Universal analog input channels receive raw measurement signals from temperature transmitters, thermocouples, RTDs or flow/pressure transducers. Onboard high-resolution ADC converts analog sensor signals to digital values; digital processor executes PID control calculations and compares measured process value against user-set target setpoint. Calculated control output signal triggers internal relay outputs to actuate heating/cooling valves, motor contactors or solenoid actuators. All measured process values are continuously time-stamped and stored to internal flash memory for trend visualization and historical data export.
Advantage Highlights
- Dual functionality of process control and data recording reduces required cabinet hardware count
- Universal analog input design eliminates separate signal conditioner modules for mixed sensor types
- Wide universal AC power input compatible with global industrial facility power grids
- Compact square panel form factor fits standard industrial control cabinet cutout specifications
- IP54 front panel sealing permits installation in light splash factory workshop environments
Applicable Industries
Laboratory thermal test chambers, food and beverage production temperature control, plastic injection molding machines, pharmaceutical batch processing equipment, small boiler plant temperature regulation, environmental test chamber monitoring
Installation Requirements
- Install flush mounted into 92 mm × 92 mm standard square control panel cutout
- Torque rear terminal block screws to 1.0 N·m for analog sensor wiring; 1.5 N·m for power wiring
- Maintain minimum 100 mm clearance behind panel for rear terminal wiring routing
- Separate low-voltage analog sensor wiring from high-current AC power wiring by minimum 30 mm distance
- Connect chassis ground terminal to facility protective earth bus with 2.5 mm² copper wire
Usage Precautions
- Do not mount unit in environments with sustained surface temperature exceeding 50 °C
- Conduct annual calibration of analog input channels for quality audit critical production processes
- Avoid spraying liquid cleaning agents directly onto front LCD touch screen panel
- Configure password protection for PID setpoint and alarm threshold parameters in public access equipment locations
- Export logged historical data to external USB storage before reaching internal flash memory full capacity
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