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Dwyer 4B Series 1/4 DIN Temperature/Process Controller

RETAIL: 163.00
BASE PRICE: 155.00

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Series 4B 1/4 DIN Temperature/Process Controller

Universal Inputs, Dual Control Output, RS-485 Communications




The Series 4B 1/4 DIN Temperature/Process Controller is designed to accept thermocouple, RTD, current or voltage input and provide dual outputs for control. Available outputs include relay/relay, voltage pulse/relay, current/relay, or linear voltage/relay. 

The units can be programmed for ON/OFF, PID, auto-tuning, or manual tuning control methods. The PID control is supported by 64 ramp/soak actions. The Series 4B also includes two additional alarm outputs. The second relay output can be reconfigured as a third alarm output. The alarm type can be selected from 13 different preprogrammed alarm functions. The controller features dual LED displays for local indication of process and setpoint values.




  • Inputs: Thermocouple, RTD, DC voltages or DC current.

  • Display: Two 4-digit, 7 segment .25" H LED's, PV,:red, SV: green

  • Supply Voltage: 100 to 240 VAC, 50/60 Hz.

  • Accuracy: ±0.25% Span

  • Operating Temperature: 32 to 122°F

  • Control Output: 4 to 20 ma, Relay: SPDT, 5A, Voltage Pulse: 14V, Linear Voltage: 0-5V, 0-10V

  • Communications: RS-485 Modbus® A-5-11/RTU Communications protocol

  • Memory Backup: Nonvolatile memory.



Model Number

Output 1

Output 2


Voltage Pulse









Linear Voltage Relay



Input Types


Type K T/C

-328 to 2372°F (-200 to 1300°C)

Type J T/C

-148 to 2192°F (-100 to 1200°C)

Type T T/C

-328 to 752°F (-200 to 400°C)

Type E T/C

32 to 1112°F (0 to 600°C)

Type W T/C

-328 to 2372°F (-200 to 1300°C)

Type R T/C

32 to 3092°F (0 to 1700°C)

Type S T/C

32 to 3092°F (0 to 1700°C)

Type B T/C

212 to 3272°F (100 to 1800°C)

Type L T/C

-328 to 1562°F (-200 to 850°C)

Type U T/C

-328 to 932°F (-200 to 500°C)

Pt 100 RTD

-328 to 1112°F (-200 to 600°C)

0-50 mV

-999 to 9999

0-5 V

-999 to 9999

0-10 V

-999 to 9999

0-20 mA*

-999 to 9999

4-20 mA*

-999 to 9999

*Requires 250 Ohm Precision Resistor



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A-277 Precision Resistor, 250 Ohm (Add $ 4.00)
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