Dwyer Instruments 25121 Temperature Controller
Request a quote
Dwyer Instruments 25121 temperature controller accepts thermocouple or RTD input with SSR output, alarm function, and high accuracy ±0.25% span.
Product details
| Model | 25121 |
| Manufacturer | Dwyer Instruments |
| Category | Process Instruments |
| Availability | Made to order |
Description
Overview
The Dwyer Instruments 25121 is a microprocessor-based temperature controller designed for industrial process control applications. It accepts input from thermocouples or resistance temperature detectors (RTDs) and provides control output via a solid-state relay (SSR). With high accuracy of ±0.25% of span, non-volatile memory, and multiple output options, the 25121 is suitable for heating and cooling control in industrial equipment, HVAC systems, and process chambers.
Key Features
- Accepts Thermocouple (3 MΩ minimum impedance) or RTD (200 µA maximum) input
- Solid-state relay (SSR) output rated 2.5 A @ 240 VAC at 77°F, derating to 1.25 A @ 55°C
- Dual 4-digit LED display (0.56" height) showing temperature and setpoint
- Selectable resolution: 1°F or 0.1°F increments
- High accuracy: ±0.25% of span, ±1°F
- Alarm function for out-of-range temperature conditions
- Selectable control action for reverse (heating) or direct (cooling) applications
- Adjustable ramp time from 0 to 100 hours
- Supply voltage: 100-240 VAC or 132-240 VDC ±10%
- Low power consumption: 5 VA maximum
- Non-volatile memory requires no batteries for retention
- NEMA 4X (IP65) front panel rating for harsh environments
Applications
- Industrial heating and cooling process control
- HVAC system temperature management
- Oven and furnace control
- Process chamber temperature regulation
- Equipment protection via temperature alarms
Specifications
| Input Type | Thermocouple or RTD |
| Output Type | Solid State Relay (SSR) |
| Accuracy | ±0.25% of span, ±1°F |
| Display | Two 4-digit LED, 0.56" height |
| Resolution | 1°F or 0.1°F selectable |
| Input Impedance (Thermocouple) | 3 MΩ minimum |
| Input Impedance (RTD) | 200 µA maximum |
| Supply Voltage | 100-240 VAC or 132-240 VDC ±10% |
| Power Consumption | 5 VA maximum |
| Operating Temperature | -10 to 55°C (14 to 131°F) |
| Output Rating (SSR) | 2.5 A @ 240 VAC (77°F), derates to 1.25 A @ 55°C |
| Control Action | Selectable reverse (heating) or direct (cooling) |
| Ramp Time | 0-100 hours adjustable |
| Memory | Non-volatile, no batteries required |
| Front Panel Rating | NEMA 4X (IP65) |
Request a quote
Dwyer Instruments 25121 Temperature Controller
Response within 24 hours
No obligation
Direct communication