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YOKOGAWA DX2020-3-4-2
Product Overview:
The DX2020-3-4-2 is a paperless (chartless) recorder from Yokogawa’s DX2000 series. The model code breaks down as: DX2020 = base model with 20 recording channels capability; 3 = 3-slot main unit; 4 = 4 analog input channels; 2 = 2 alarm output channels. This instrument replaces traditional chart recorders with digital recording, display, and data management.
Detailed content
Technical Specifications:
| Parameter | Value |
|---|---|
| Number of Recording Channels | Up to 20 channels (with expansion) |
| Analog Input Channels | 4 channels (built-in) |
| Alarm Output Channels | 2 channels (built-in) |
| Input Signal Types | DC voltage (1–5 V, 0–10 V), DC current (4–20 mA, 0–20 mA), Thermocouple (K, J, T, E, R, S, B, N, L, U, W), RTD (Pt100, JPt100, Pt1000, JPt1000, Cu50) |
| Recording Speed | 0.1 s to 60 s per scan (adjustable per channel) |
| Display | 5.6-inch TFT color LCD (640 × 480 pixels) |
| Memory Capacity | 8 MB internal flash memory (approx. 2000 hours of data at 1 s interval) |
| Communication Interfaces | RS-232C, RS-485 (Modbus RTU), Ethernet (Modbus TCP) |
| Power Supply | 100–240 VAC, 50/60 Hz |
| Dimensions | 96 mm (W) × 96 mm (H) × 158 mm (D) (with front bezel) |
| Weight | Approximately 0.9 kg |
| Protection | Front panel: IP65 / NEMA 4X (with gasket) |
| Safety Standard | UL, CSA, CE marked |
Functional Features:
- Simultaneous recording of up to 20 process variables on one unit
- Built-in math functions: addition, subtraction, multiplication, division, square root, moving average
- Event recording: captures timestamp of alarm events, operator actions, and setpoint changes
- USB data export: data can be transferred to PC via USB mass storage
- Password protection: restricts parameter changes to authorized personnel
- Multi-language display: English, Japanese, Chinese, Korean, German, French, Spanish, Portuguese
Working Principle:
The DX2020 samples all analog input channels sequentially via a multiplexed 16-bit ADC. Each channel’s signal is converted to a digital value, scaled to engineering units using user-configured range parameters, and stored in circular buffer memory. Data is written to internal flash memory with timestamps. The LCD display shows real-time trends, bar graphs, and numerical values. Alarm logic compares each channel’s value against user-set high/low limits and triggers the 2 alarm output relays when limits are exceeded.
Advantages:
- Eliminates consumable recording paper — reduces long-term operating cost
- High-resolution color display provides superior readability compared to paper charts
- Data export capability enables seamless integration with SCADA and historian systems
- Compact 1/8 DIN front panel size — fits standard instrument cutouts
Applicable Industries:
- Chemical & Petrochemical — multi-variable process trend recording
- Pharmaceutical — GMP-compliant batch data recording
- Food & Beverage — HACCP temperature and process recording
- Power Generation — turbine and boiler parameter logging
- Water/Wastewater — remote station data acquisition
Installation Requirements:
- Cut 92 mm × 92 mm panel opening for DIN mounting
- Use shielded twisted-pair cables for all analog inputs
- Ground the chassis to facility earth ground
- Configure communication parameters (baud rate, Modbus address) before network connection
Usage Precautions:
- Do not exceed input signal limits — overvoltage on voltage inputs may damage the ADC
- For thermocouple inputs, use correct type wire — mismatched thermocouple type causes measurement error
- Backup data regularly via USB — internal memory is not infinite
- Do not operate in ambient temperature exceeding +55°C
