Dwyer 25021 Temperature Controller
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Dwyer 25021 is a temperature controller with thermocouple/RTD input, SSR output, dual 4-digit LED display, ±0.25% accuracy, and IP65 front panel rating.
Product details
| Model | 25021 |
| Manufacturer | Dwyer Instruments |
| Category | Process Instruments |
| Availability | Made to order |
Description
Overview
The Dwyer 25021 is an industrial temperature controller designed for precise process control applications. It accepts thermocouple or RTD temperature inputs and outputs to a solid-state relay (SSR), making it ideal for heating and cooling control in manufacturing and industrial settings. The unit features a rugged NEMA 4X (IP65) rated front panel suitable for harsh environments.
Key Features
- Accepts thermocouple or RTD temperature inputs with 3 MΩ minimum thermocouple impedance
- Solid-State Relay (SSR) output: 2.5A @ 240VAC (de-rates to 1.25A @ 55°C)
- Dual 4-digit, 7-segment LED display with 0.56" character height for clear visibility
- High accuracy: ±0.25% of span, ±1°C
- Selectable resolution: 1°C or 0.1°C
- Adjustable ramp time from 0-100 hours for gradual temperature changes
- Non-volatile memory backup (no batteries required)
- NEMA 4X (IP65) front panel rating for harsh industrial environments
- Universal voltage supply: 100-240 VAC or 132-240 VDC
- Selectable control action: reverse (heating) or direct (cooling)
- Low power consumption: 5 VA maximum
Applications
- Industrial heating and cooling process control
- Oven and kiln temperature regulation
- Water and air temperature management systems
- HVAC systems and climate control
- Machine and equipment temperature monitoring
Specifications
| Input Type | Thermocouple or RTD |
| Output Type | Solid-State Relay (SSR) |
| Output Rating | 2.5A @ 240VAC @ 77°F (de-rates to 1.25A @ 130°F) |
| Display | Dual 4-digit, 7-segment LED, 0.56" high |
| Resolution | 1°C or 0.1°C |
| Accuracy | ±0.25% of span, ±1°C |
| Supply Voltage | 100-240 VAC nominal (±10%, 50-400 Hz) or 132-240 VDC nominal (±10%) |
| Power Consumption | 5 VA maximum |
| Operating Temperature | -10°C to 55°C (14°F to 131°F) |
| Ramp Time | Adjustable from 0-100 hours |
| Memory Backup | Non-volatile (no batteries required) |
| Input Impedance | Thermocouple = 3 MΩ minimum; RTD current = 200µA maximum |
| Isolation | SSR output: 1500 VAC |
| Weight | 13 oz (369 g) |
| Front Panel Rating | NEMA 4X (IP65) |
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Dwyer 25021 Temperature Controller
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