Brief Introduction to HONEYWELL 900A01-0202 Temperature Controller
The HONEYWELL 900A01-0202 is exactly this kind of “temperature guardian,” keeping industrial equipment at precise temperatures to ensure consistent results.
1. Product Description
The HONEYWELL 900A01-0202 is a compact, industrial-grade temperature controller designed to monitor and regulate temperature in a wide range of equipment. It’s widely used in factories, laboratories, and processing plants—from controlling oven temperatures in a bakery to stabilizing reactor heat in a chemical facility.
Its core job is straightforward: it connects to a temperature sensor (like a thermocouple or RTD) that measures the equipment’s actual temperature. It then compares this reading to the “setpoint” (the desired temperature) and adjusts heating or cooling devices (such as heaters or fans) to close the gap. For example, if a plastic extruder gets too hot, the controller will reduce the heater’s power; if it’s too cold, it will boost it.
Built for industrial use, it resists electrical interference and mild vibration, and its simple interface—with a clear display and easy-to-use buttons—means operators can set temperatures or troubleshoot without advanced training. It also fits neatly into standard control panels, saving valuable space.
2. Technical Specifications
The 900A01-0202 balances precision and practicality, with specs tailored to real-world industrial needs:
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Control Type: On-off & proportional control—suitable for both simple and semi-precise temperature needs
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Temperature Range: -50°C to +400°C—covers most industrial heating and cooling applications
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Sensor Compatibility: Supports J/K-type thermocouples and Pt100 RTDs—works with common industrial sensors
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Accuracy: ±0.5% of full scale—ensures temperature stays within tight limits (e.g., ±2°C for a 400°C setpoint)
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Operating Voltage: 100–240 V AC (universal input)—fits power supplies worldwide
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Output: 1 relay output (250 V AC, 5 A)—controls heaters, fans, or contactors
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Operating Temperature: 0°C to +50°C—works in standard control room or cabinet environments
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Dimensions: 48 mm × 48 mm × 100 mm (panel-mounted)—ultra-compact for tight spaces
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Display: 2-line LED display—shows actual temperature and setpoint clearly at a glance
3. System Introduction
The 900A01-0202 is a key component of Honeywell’s “Industrial Temperature Control System”—a modular lineup that includes controllers, sensors, actuators (heaters/coolers), and monitoring software. This system is designed to be flexible, working for small standalone machines or integrated into large production lines.
Let’s take a food drying oven as an example to see how the system works:
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A Pt100 RTD sensor inside the oven measures the actual temperature (e.g., 55°C) and sends the signal to the 900A01-0202 controller.
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The controller compares 55°C to the setpoint (e.g., 60°C) and triggers its relay output.
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The relay turns on the oven’s heater. When the sensor detects the temperature reaches 60°C, the controller shuts off the heater.
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If the temperature drops to 58°C (the “lower limit”), the controller turns the heater back on—maintaining a steady 58–60°C range.
For larger systems, multiple 900A01-0202 controllers can connect to Honeywell’s monitoring software via a communication module, letting operators track temperatures across multiple ovens or machines from a central control room. This system is trusted for its reliability, as even small temperature deviations can ruin batches of products—costing time and money.
4. Recommended Honeywell Related Models
Honeywell offers a range of temperature controllers to match different precision needs, temperature ranges, and application environments. Here are the most practical alternatives and upgrades:
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HONEYWELL 900A01-0302: Proportional-Integral-Derivative (PID) control—for ultra-precise applications (e.g., pharmaceutical lab incubators)
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HONEYWELL 900A01-0102: Lower-temperature range (-100°C to +300°C)—ideal for cold storage or freezer control
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HONEYWELL 900A01-0203: High-temperature variant (+50°C to +600°C)—for industrial furnaces or metal heat-treating equipment
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HONEYWELL 900A01-0204: Explosion-proof model (ATEX-certified)—safe for hazardous areas (e.g., chemical reactors or oil refinery heaters)
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HONEYWELL 900A02-0202: Dual-channel controller—monitors and controls two temperatures at once (e.g., a two-zone oven)
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HONEYWELL 900A01-0205: Communication-enabled version (Modbus RTU)—supports remote monitoring via computer or HMI
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HONEYWELL 900A01-0206: Compact 22 mm × 45 mm model—for machines with extremely limited panel space (e.g., small laboratory equipment)
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HONEYWELL 900A01-0207: Universal sensor model—works with 8+ sensor types (saves inventory for factories using multiple sensor kinds)
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