Technical Specifications:

• Product Series: DR200 Series
• Model Number: DR231-11-31-1M/M1/C1
• Number of Inputs: 1 channel (universal input)
• Alarm Outputs: 3 alarm outputs + 1 event output
• Input Signals: DC 1–5V, DC 0–10V, 4–20mA, TC (J, K, T, E, N, R, S, B), RTD (Pt100, JPt100, Cu50)
• Display: 5-digit LED display (14.2 mm digit height)
• Accuracy: ±0.1% of reading + 0.05% of span
• Sampling Rate: 200 ms (typical)
• Power Supply: 100–240 VAC, 50/60 Hz or 24 VDC
• Communication: RS-485 (Modbus RTU)
• Operating Temperature: 0°C to +50°C
• Enclosure: IP65 (front panel)
• Dimensions: 96 × 96 × 110 mm (W×H×D) — DIN panel cutout 92 × 92 mm
• Weight: Approximately 0.5 kg

Functional Features:

• Universal input accepts all major sensor types without hardware change
• 5-digit LED display with clear visibility from distance
• 3 alarm outputs with independent setpoints and hysteresis
• Event recording with timestamp
• Trend recording to internal memory (up to 10,000 data points)
• RS-485 communication for SCADA/DCS integration (Modbus RTU)
• Compact DIN-rail mount design (1/8 DIN, 96 × 96 mm)
• Programmable function keys for quick operation

Performance Parameters:

• Display Range: -9999 to 99999 (5 digits)
• Update Rate: 4 times per second (typical)
• Alarm Response Time: Less than 100 ms
• Isolation: 1500V DC (input to output, input to power)
• Power Consumption: Less than 5VA (AC), Less than 3W (DC)
• Memory: 10,000 data points (trend)
• MTBF: Over 50,000 hours

Material Composition:

• Front Panel: Polycarbonate (PC) with UV-resistant coating
• Housing: Flame-retardant ABS resin (rear), Die-cast aluminum (heat sink)
• Terminal Block: Phoenix Contact compatible, Phosphor bronze terminals
• LED Display: High-brightness red LED (5-digit, 7-segment)

Structural Features:

• DIN-rail mounting (96 × 96 mm panel cutout, 1/8 DIN)
• Front panel with LED display, 4 function keys, and indicator LEDs
• Terminal blocks at bottom for field wiring
• RS-485 terminal for communication
• Alarm LED indicators (3 alarm + 1 event)
• Key lock for parameter protection

Working Principle: The DR231 receives a universal process signal (voltage, current, thermocouple, or RTD) through its terminal blocks. The signal is conditioned, linearized, and A/D converted internally. The processed value is displayed on the 5-digit LED display and compared against 3 programmable alarm setpoints. When the process value exceeds or falls below an alarm setpoint (with configured hysteresis), the corresponding alarm relay output activates. The device continuously stores trend data in internal memory and transmits data via RS-485 Modbus RTU protocol to a SCADA system or DCS. The event output records state changes with timestamps.

Advantage Highlights:

• Universal input eliminates need for multiple device types
• Compact 96 × 96 mm DIN-rail design saves panel space
• High-visibility LED display for outdoor/bright environments
• Built-in trend recording eliminates need for separate chart recorder
• RS-485 Modbus for easy integration with any SCADA/DCS
• 3 independent alarms with hysteresis for reliable operation
• Cost-effective alternative to full chart recorders

Applicable Industries:

• Chemical Plants
• Food & Beverage
• Water & Wastewater Treatment
• HVAC
• Pharmaceutical
• Power Generation (auxiliary systems)
• Building Automation

Model Series:

• DR200 Series: DR201, DR202, DR203, DR210, DR220, DR230, DR240
• Channel Variants:
  • -11: 1 input
  • -22: 2 inputs
  • -33: 3 inputs
  • -44: 4 inputs
• Alarm Variants:
  • -31: 3 alarms + 1 event
  • -32: 3 alarms + 2 events
  • -33: 3 alarms + 3 events
• Power Options:
  • -M: 100–240VAC
  • -M1: 24VDC
  • -C1: Specific communication option

Installation Requirements:

• DIN-rail mounting: EN 60715, 35mm top-hat rail
• Panel cutout: 92 × 92 mm (minimum)
• Ambient temperature: 0°C to +50°C
• Relative humidity: 30% to 85% RH (no condensation)
• Vibration: Within IEC 60068-2-6 limits
• Wiring: Use shielded cable for TC/RTD inputs, grounded at one end
• Clearance: Minimum 50 mm above for ventilation

Usage Precautions:

• Configure input type (TC type, RTD type, mA range) correctly during setup
• Cold junction compensation is automatic for TC inputs — do not disable
• Calibrate using a precision signal source during commissioning
• Backup parameters via RS-485 before changes
• Do not exceed input signal limits (max 40mA, max 30VDC)
• Replace battery (if applicable for memory backup) per maintenance schedule
• Check alarm relay ratings match load requirements (250VAC/2A or 30VDC/2A)