- Official UK and Ireland channel partner
- UK technical support available
- Model selection and configuration support
Dwyer Series 4B Temperature and Process Controller
Control temperature or analogue process variables with universal inputs, dual outputs and programmable PID functions.
Key highlights
- Format: 1/4 DIN panel controller
- Inputs: Thermocouple, RTD, voltage or current
- Control: On/off, PID, manual or 64-step ramp/soak
- Outputs: Dual outputs configured by model
- Communications: RS-485 Modbus ASCII/RTU
The Dwyer Series 4B is a 1/4 DIN temperature and process controller for enclosed-panel installations. Its universal input accepts common thermocouples, Pt100 or JPt100 RTDs and voltage or current process signals, allowing the same platform to control temperature or a compatible transmitter signal.
Control can be configured for on/off, PID, manual or programmed ramp/soak operation. Up to 64 ramp/soak actions support staged setpoint profiles, while heating and cooling can be assigned across the two outputs when the selected model and control mode permit.
Model choice defines output 1 and supply voltage. Current catalogue models provide voltage pulse, relay, 4-20 mA or 0-10 V as output 1, with a relay as output 2. Standard models use 100-240 VAC, while -LV models use 24 VDC.
Dual four-digit LED displays show process value and setpoint simultaneously. RS-485 Modbus ASCII/RTU is standard, supporting integration with compatible supervisory or automation systems.
The Series 4B suits ovens, boilers, chillers, environmental chambers, hot plates, melt pots, packaging equipment and food-service machinery. Correct selection depends on sensor or process input, control mode, output type and load, supply voltage, panel dimensions and any required accessories.
Key Features
- Universal input platform: Configure the controller for common thermocouples, Pt100 or JPt100 RTDs, or analogue transmitter signals
- Auto-tuned PID control: PID, on/off and manual modes support varied heating, cooling and process duties
- Profile programming: Eight patterns with up to eight steps each provide as many as 64 ramp/soak actions
- Heating and cooling operation: The two outputs can be assigned for paired heat/cool control where the selected mode permits
- Output selection: Choose voltage pulse, relay, 4-20 mA or 0-10 V for output 1, with relay output 2
- Operator visibility: Separate red process-value and green set-value displays support at-panel checking
- System integration: Standard RS-485 Modbus ASCII/RTU communications and non-volatile settings support connected operation
- Panel protection: IP56-rated front panel suits properly mounted enclosed-panel installations
Specifications
| Inputs and Measurement | |
| Input types | Thermocouple, 3-wire Pt100 or JPt100 RTD, DC voltage or DC current |
| Thermocouple types | K, J, T, E, R, S, B, L and U; confirm compatibility before selecting N, TXK or W |
| Thermocouple ranges | K: -200 to 1300°C; J: -100 to 1200°C; T: -200 to 400°C; E: 0 to 600°C; R/S: 0 to 1700°C; B: 100 to 1800°C; L: -200 to 850°C; U: -200 to 500°C |
| RTD ranges | Pt100: -200 to 850°C; JPt100: -20 to 400°C |
| Analogue inputs | 0-50 mV, 0-5 V, 0-10 V, 0-20 mA or 4-20 mA; scalable display range -999 to 9999 |
| Current-input resistor | A-277 250 ohm precision resistor required across the input terminals for 0-20 mA or 4-20 mA input |
| Accuracy | ±0.25% of span ±1 least significant digit |
| Input scan time | 150 ms for analogue input; 400 ms for thermocouple or RTD |
| Control and Programming | |
| Control modes | PID, on/off, manual or PID programme control with ramp/soak |
| PID setup | Auto-tune function available for PID operation |
| Ramp/soak capacity | Eight patterns with up to eight steps per pattern; up to 64 ramp/soak actions |
| Heating and cooling | Output 1 can operate for heating or cooling; outputs 1 and 2 can be paired for simultaneous heat/cool control |
| Alarm functions | Configurable process and system alarm functions; available alarm outputs depend on the selected output and control-mode configuration |
| Outputs and Model Selection | |
| Output 1 choices | 14 VDC voltage pulse, SPDT relay, 4-20 mA current or 0-10 V linear voltage, selected by model |
| Output 2 | SPDT relay on the eight current catalogue models |
| Voltage-pulse and relay models | 4B-23: 100-240 VAC; 4B-23-LV: 24 VDC |
| Dual-relay models | 4B-33: 100-240 VAC; 4B-33-LV: 24 VDC |
| Current and relay models | 4B-53: 100-240 VAC; 4B-53-LV: 24 VDC |
| Voltage and relay models | 4B-63: 100-240 VAC; 4B-63-LV: 24 VDC |
| Relay rating | SPDT, 5 A at 250 VAC resistive |
| Voltage-pulse output | 14 VDC, 40 mA maximum |
| Current output | 4-20 mA; 600 ohm maximum load resistance |
| Linear-voltage output | 0-10 V on 4B-63 and 4B-63-LV models |
| Display, Communications and Power | |
| Display | Two four-digit, seven-segment LED displays; process value red and set value green |
| Communications | RS-485 Modbus ASCII/RTU, standard on all current models |
| Supply power | 100-240 VAC, 50/60 Hz; 24 VDC on -LV models |
| Power consumption | 5 VA maximum |
| Memory | Non-volatile memory retains configured settings |
| Mechanical and Environmental | |
| Panel format | 1/4 DIN, 96 x 96 mm front |
| Panel cut-out | 91 x 91 mm |
| Mounting | Enclosed-panel mounting |
| Front-panel rating | IP56 |
| Operating temperature | 0 to 50°C |
| Storage temperature | -20 to 65°C |
| Relative humidity | 35% to 80%, non-condensing |
| Weight | 425 g |
Support
Able Instruments are an official UK and Ireland channel partner for DwyerOmega, providing application advice, configuration support and quotation assistance for the Series 4B family.
- Model selection: Support matching the input, output arrangement, supply voltage, control mode and panel format
- Option compatibility: Checks for sensors, transmitter signals, current-input resistor, alarms, RS-485 integration and relevant accessories
- Installation support: Advice on panel mounting, power, input and output integration using the current model documentation
- Documentation support: Help with the catalogue sheet, operating manual, quick-start guide and configuration records
Accessories
- A-277 250 ohm precision resistor
- A-600 R/C snubber
- A-900 weatherproof front-mount enclosure
- A-901 weatherproof internal-mount enclosure with window
- MN-1 RS-485 to USB converter