Model Number Breakdown:

• DR1A: DR series recorder, 1-channel input, A = alarm function
• 100G: 100 mm chart width; G = general-purpose configuration
• 1D4A: 1 recording point (D = display/record), 4 alarm outputs (4A)
• 4G2: 4 alarm relays, 2 display outputs (additional option)
• 030: RS-485 communication option (Modbus RTU)
• 0202: Specific firmware/configuration revision
• CE: CE marked for European Union compliance

Key Specifications:

• Chart Width: 100 mm (standard)
• Number of Recording Points: 1 point (1 pen)
• Number of Alarm Outputs: 4 relay outputs (SPDT, 250 V AC / 30 V DC, 3 A)
• Input Types: DC 0–1 V, DC 1–5 V, DC 0–10 V, DC 0–20 mA, DC 4–20 mA, Thermocouple (J, K, T, E, R, S, B, N), RTD (Pt100, Pt1000, Cu50, Ni100)
• Chart Speed: 20 mm/h, 40 mm/h, 80 mm/h, 120 mm/h (selectable)
• Recording Accuracy: ±0.5% of full scale (at 25 °C)
• Display: Digital LCD (numeric value + bar graph)
• Power Supply: 100–240 V AC, 50/60 Hz
• Power Consumption: ≤ 25 W
• Operating Temperature: 0 to 50 °C
• Protection Rating: IP54 (front panel)
• Communication: RS-485 (Modbus RTU) via 4G2 option
• CE Marking: Yes (Low Voltage Directive 2014/35/EU, EMC Directive 2014/30/EU)

Functional Features:

• Hybrid Recording: Simultaneous analog chart recording (pen-on-paper) and digital LCD display
• 4 Independent Alarms: Each alarm can be configured as High, Low, Deviation, or Rate-of-Change with independent setpoints
• Bar Graph Display: Real-time bar graph on the LCD for quick visual status check
• Event Recording: 200 events logged with timestamp in non-volatile memory
• Self-Diagnosis: Pen break detection, paper end detection, motor fault detection
• Modbus Communication: Remote reading of current values and alarm status via RS-485

Material Composition:

• Housing: Cold-rolled steel with powder-coated finish (light gray, RAL 7035)
• Front Bezel: ABS plastic with transparent window for chart viewing
• Chart Paper: 100 mm width, 20 m roll (standard); available in blue, red, yellow
• Pen Assembly: Ballpoint pen with black ink (replaceable)
• PCB: FR-4 epoxy glass, conformally coated

Structural Characteristics:

• Form Factor: Panel-mount (1/4 DIN cutout compatible)
• Dimensions: 144 mm (W) × 144 mm (H) × 170 mm (D) (approximate)
• Cutout Size: 138 mm × 138 mm
• Weight: Approximately 3.5 kg (including chart drive mechanism)
• Chart Drive: Synchronous motor with pen carriage (100 mm travel)

Operating Principle:
The input signal (voltage, current, thermocouple, or RTD) is conditioned by an analog front-end circuit that linearizes and scales the signal to 0–100% of full scale. The conditioned signal drives two outputs simultaneously: (1) the pen servo motor moves the pen across the 100 mm chart paper at the selected speed (20/40/80/120 mm/h), creating a continuous analog trend; (2) the A/D converter digitizes the signal and displays it on the LCD as a numeric value and bar graph. When the measured value crosses any of the 4 alarm setpoints, the corresponding SPDT relay changes state (energizes or de-energizes), signaling the alarm condition to external devices (horns, lights, DCS inputs). The RS-485 Modbus RTU interface allows a SCADA or DCS to poll the current value and alarm status remotely.

Advantages & Highlights:

• Dual Recording: Both paper chart (for regulatory compliance and archival) and digital display (for real-time monitoring) — the best of both worlds
• Wide Input Flexibility: Accepts all major sensor types (TC, RTD, mA, mV) on a single channel
• 4 Alarms: Sufficient for most single-loop applications (e.g., tank level, temperature control)
• CE Compliant: Fully certified for European market installation

Applicable Industries:

• Power Generation (Boiler/Turbine Monitoring)
• Chemical Plants (Single-Loop Control)
• Water & Wastewater (Pump Station Monitoring)
• Oil & Gas (Wellhead Monitoring)
• Food & Beverage (Batch Process Recording)
• HVAC (Building Temperature/Humidity Logging)

Installation Requirements:

• Cut a 138 mm × 138 mm panel opening; install with gasket seal
• Connect input using shielded twisted-pair cable; ground shield at recorder end only
• Provide 100–240 V AC, 50/60 Hz power with ≤ 10% voltage fluctuation
• For RS-485 communication, use shielded twisted-pair cable (max 1200 m at 9600 bps)
• Load 100 mm chart paper roll before energizing — perform a pen zero calibration

Usage Precautions:

• Use only Yokogawa-specified chart paper (100 mm width, 20 m roll) — incompatible paper will jam the mechanism
• Replace the ballpoint pen when ink runs out — do not use fountain pen ink (will clog)
• Perform pen zero calibration after every paper roll change
• Do not expose the recorder to ambient temperatures above +50 °C — the synchronous motor may malfunction
• The pen servo motor draws high inrush current at startup — use a dedicated circuit breaker (2 A)