Honeywell DR4500

Honeywell DR4500

Product Overview
The Honeywell DR4500 is a microprocessor-based 12-inch circular chart recorder designed for continuous process recording, display, control, and communication in industrial environments. It is widely used in food processing, pharmaceuticals, heat treatment, environmental testing, manufacturing, and water/wastewater treatment. The DR4500 family includes Truline models that print their own chart on blank heat-sensitive paper, and Classic models that use traditional fiber-tip pens and pre-printed charts.

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Description

Honeywell DR4500

Technical Specifications

  • Brand: Honeywell
  • Product Family: DR4500 Circular Chart Recorder
  • Chart Size: 12-inch circular chart
  • Measurement Accuracy: 0.1% reference accuracy
  • Input Channels: 1 to 4 analog input channels depending on model
  • Input Types: Thermocouple, RTD, 4-20 mA, 0-10 V, and other standard industrial signals
  • Display: Six-character upper display and eight-character lower display with deviation bar graph
  • Communication: RS-485 Modbus RTU
  • Control: Integral PID control with autotune capability
  • Protection: NEMA 3 / NEMA 4X front panel protection options
  • Certifications: CE, UL, CSA, FM depending on configuration

Functional Features

  • Records up to four process variables on the same timeline in Truline models.
  • Prints its own chart grid, range markings, engineering units, time/date, and channel identifiers.
  • Eliminates errors caused by temperature and humidity changes affecting pre-printed paper.
  • Provides a 21-segment deviation bar graph to show PV versus SP deviation.
  • Supports PID control, setpoint programming, totalizer, timer, and math functions.
  • Offers configurable alarms with visual and printed indications.
  • Supports password-protected configuration lockout.
  • Provides RS-485 Modbus RTU communication for remote monitoring and data integration.
  • Includes transmitter excitation voltage in certain models to power field devices.

Application Scenarios

  • Food and beverage process recording and pasteurization monitoring
  • Pharmaceutical cleanroom and sterilization process documentation
  • Heat treatment, annealing, and quenching temperature profiling
  • Environmental chamber and humidity monitoring
  • Industrial and municipal wastewater flow and quality recording
  • Boiler, oven, kiln, and reactor temperature monitoring
  • Batch process documentation requiring physical chart records

Performance Parameters

  • Reference accuracy: 0.1%
  • Chart diameter: 12 inches
  • Analog inputs: up to 4 channels depending on model
  • Control loops: up to 2 PID loops depending on model
  • Communication: RS-485 Modbus RTU
  • Alarm outputs: configurable alarm relays available depending on model
  • Operating temperature: 0°C to 55°C depending on model
  • Humidity: 5% to 90% RH at 40°C depending on model
  • Vibration resistance: 0 to 200 Hz, 0.2 g depending on model
  • Mechanical shock: 5 g, 30 ms depending on model

Material Composition

  • Molded industrial housing
  • Gasketed front door
  • Protective glass window
  • Thermal printing mechanism
  • Chart drive motor assembly
  • Microprocessor-based electronics
  • Analog input conditioning circuitry
  • Relay output modules depending on configuration
  • Terminal blocks and wiring interfaces

Structural Features

  • 12-inch circular chart layout for easy trend visualization.
  • Front-facing digital display and configuration keypad.
  • Truline models use a single thermal pen to print chart grid and traces.
  • Classic models use fiber-tip pens and pre-printed circular charts.
  • Modular construction for maintenance and configuration changes.
  • Panel-mount or surface-mount installation options.
  • Gasketed door and glass window for industrial environment protection.
  • Rear or side terminal access for signal wiring.

Working Principle
The DR4500 accepts analog process signals from field instruments such as temperature, pressure, flow, level, or pH transmitters. The microprocessor conditions and digitizes the signals, calculates engineering units, and drives the circular chart recording mechanism. In Truline models, a thermal pen prints the chart grid and up to four process traces on blank heat-sensitive paper. The recorder also displays process values, setpoints, alarms, and status information, and can output control signals through its PID controller and relay options.

Installation Requirements

  • Select the correct DR4500 model for the required inputs, outputs, and communication options.
  • Verify power supply voltage and frequency before wiring.
  • Use shielded cables for analog input signals.
  • Separate signal wiring from high-voltage power cables.
  • Ensure proper panel cutout dimensions for panel-mounted installations.
  • Provide adequate rear clearance for wiring and ventilation.
  • Ground the instrument according to local electrical codes.
  • Configure input type, range, alarm setpoints, and communication parameters before commissioning.

Precautions

  • Do not exceed the rated input signal range.
  • Use only compatible circular chart paper for the selected model.
  • Keep the chart compartment clean and dry.
  • Replace thermal paper rolls before they run out to avoid recording gaps.
  • Verify alarm and control outputs during startup testing.
  • Protect configuration settings with password lockout where required.
  • Confirm exact specifications from the official Honeywell DR4500 datasheet and nameplate, as capabilities vary by sub-model.

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