1. Home
  2. Products
  3. Controllers
  4. Classic Premium Series
  5. Classic Premium Series | 48 x 48mm  C91

Classic Premium Series | 48 x 48mm

C91
https://www.brainchildtw.com/web/image/product.template/66/image_1920?unique=74d9fbf

PID Temperature controller

• Fuzzy PID with auto-tune control
• Dual output: Relay, SSR or Analog
• 18-bit A/D for high precision input
• RS-485 & RS-232 communication
• 4-key LED interface with USB setup

This combination does not exist.

Features Applications Specification Download FAQ Ordering Code

Features

  • 1/16 DIN compact size for tight panel spaces
  • Bright 4-digit LED display for clear readout
  • 4-button keypad with tactile feedback design
  • Supports TC, RTD, mV, mA, and voltage inputs
  • 5Hz sampling rate for fast signal response
  • 15-bit D/A output for analog retransmission
  • Auto/manual mode with bumpless transition
  • Ramping function with adjustable slope rate
  • Auto-tuning with fuzzy logic PID adjustment
  • Digital filter to stabilize fluctuating signals
  • Cold and warm start auto-tune supported
  • Sensor break detection for process safety
  • Lockout levels for parameter protection
  • Configurable alarm: high, low, band, dwell
  • Output 2 can be set as dwell timer function
  • Relay, SSR, or analog output options
  • Built-in Modbus RTU via RS-232 or RS-485
  • USB programming port for PC-based setup

C91 PID Temperature Controller | 1/16 DIN PID Solution

Fuzzy PID, dual output, RS-485, fast A/D input in one

The BrainChild C91 Temperature Controller is a compact, high-performance 1/16 DIN controller designed for precise temperature management in industrial automation. Equipped with fuzzy logic auto-tuning PID, it adapts intelligently to process changes, ensuring accurate and stable control.

The C91 supports a wide range of universal input types (TC, RTD, mV, mA) with 18-bit A/D resolution and a fast 5Hz sampling rate. Output configurations include relay, SSR, or analog retransmission, making it suitable for both heating and cooling applications. Its built-in RS-232/RS-485 Modbus RTU, intuitive 4-key interface, and USB programming port offer seamless system integration and quick setup.

Panel Interface｜LED Display & 4-Key Control

Clear status indicators and 4-button keypad for easy setup   

The C91 temperature controller features a simple and functional panel interface designed for quick operation in compact control environments. A 4-digit red LED display provides clear real-time feedback of process values, setpoints, and control status.

Five status indicators on the panel signal essential operating modes:

  • Process Unit Indicator

  • Auto-Tuning Status

  • Manual Mode

  • Deviation Display

  • Output Activation

The device includes 4 tactile membrane buttons for easy configuration of setpoints, parameters, and mode selection, enhancing usability and minimizing setup time.

Input Specs｜Multi-Signal A/D Accuracy

Supports TC, RTD, mV, mA, with 18-bit resolution

The C91 temperature controller offers flexible universal input compatibility, supporting thermocouples (J, K, T, E, N, R, S), RTDs (PT100 DIN/JIS), and analog signals including 0–50 mV, 0–20 mA, 4–20 mA, 1–5V.

With a high-performance 18-bit A/D converter, it delivers precise readings across all signal types. The input circuit features cold junction compensation, digital filtering, and sensor break detection to ensure measurement stability and safety.


Output Options｜Relay, SSR or Analog  

Selectable relay, SSR voltage or 15-bit analog output for control

The C91 controller provides flexible dual-output configurations, allowing users to select from relay contacts (2A/240VAC), SSR voltage drive, or analog outputs (0–20 mA, 4–20 mA, 0–10V, 1–5V).

The analog output features 15-bit D/A resolution, ensuring high signal fidelity. Outputs can be assigned for PID control, alarm signaling, or dwell timer operation, depending on system setup.

Fuzzy PID Technology   

Smarter Control with Less Overshoot and Faster Response  

Fuzzy logic is combined with traditional PID control to deliver smarter and more adaptive temperature regulation. Unlike standard PID controllers that require manual fine-tuning for each application, fuzzy PID dynamically adjusts control responses based on real-time process behavior. The result is faster stabilization, reduced overshoot, and improved resilience to disturbances—ideal for processes where precision and speed are critical.

Built-in Programming Port for Fast Configuration

Connect to PC for configuration, calibration, and testing  

The C91 temperature controller includes a USB programming port that enables fast and efficient connection to a PC for controller setup, parameter upload/download, firmware calibration, and system testing.

With compatible configuration software, users can streamline device setup across multiple units, saving time and reducing potential for manual input errors. This feature is ideal for production environments, OEMs, and system integrators who demand consistent and scalable configuration.

BC-SET Pro Configuration Software

Easy parameter setup, backup and firmware upgrade

BC-SET Pro is the official configuration software developed by BrainChild for its over-temperature protection controllers. With a streamlined and intuitive interface, the software allows users to connect via USB programming cable and quickly configure control parameters. It supports efficient parameter editing, setting duplication between devices, and firmware upgrades to maintain device performance and stability. BC-SET Pro also enables offline configuration with the ability to save and manage multiple profiles, making it ideal for production environments, system deployment, and ongoing maintenance. Whether for new setup or existing system adjustment, this tool helps engineers and technicians simplify workflow, reduce setup time, and ensure consistent configuration across all devices.  

Batch Read/Write for Multiple Controllers 

BC-SET allows users to connect multiple controllers of the same model and perform batch parameter read/write by defining a node address range. This feature significantly streamlines configuration in OEM or multi-device environments.

Clear and Accessible System Menu 

The system menu offers quick access to key operations like Rescan (F5), Read Data (F6), Write Data (F7), Write Multiple (F8), and Communication Settings (F9). Built-in hotkeys support fast, efficient navigation.

Intuitive Communication Setup Interface

The communication settings window lets users define COM port, baud rate, parity, data bits, and stop bits — with a “Default” button for quick reset and “Save and Exit” to finalize setup. Designed to reduce setup errors.

Visual Profile Editor for Programmable Controllers 

For controllers with profile functionality, BC-SET provides a graphical editor to configure temperature ramp/soak segments. Users can easily read, modify, and write profile parameters for precise thermal process control.

Protective Class｜IP30 Panel, Indoor Use Only

IP30 front cover, IP20 housing and terminals, indoor only

The C91 temperature controller provides standard protection for indoor industrial environments. Its front panel is rated IP30, offering basic protection against solid objects >2.5mm. The housing and terminal block are rated IP20, suitable for control cabinet installation.

The controller should be installed in dry, dust-free indoor environments, and protected from direct liquid exposure. Proper mounting inside an enclosure ensures long-term reliability and electrical safety in accordance with CE and safety requirements.

Applications

Specification


 Power

90 - 250 VAC, 47 - 63 Hz, 10VA, 5W maximum

11 - 26 VAC / VDC, 10VA, 5W maximum
 Signal Input

Resolution

18 Bits

Sampling Rate

5 times / second

Maximum Rating

-2 VDC minimum, 12 VDC maximum( 1 minute for mA input )

Temperature Effect

±1.5uV/ BC for all inputs except mA input
±3.0uV/ BC for mA input

Sensor Lead Resistance Effect

T/C: 0.2uV/ohm
3-wire RTD: 2.6 °C/ohm of resistance difference of two leads
2-wire RTD: 2.6 °C/ohm of resistance sum of two leads

Burn-out Current

200nA

Common Mode Rejection Ratio(CMRR)

120 dB

Normal Mode Rejection Ratio (NMRR)

55dB

Sensor Break Detection

Sensor open for TC, RTD and mV inputs, Sensor short for RTD input, below 1 mA for 4 ~ 20 mA input, below 0.25V for 1 ~ 5 V input, unavailable for other inputs.

Sensor Break Responding Time

Within 4 seconds for TC, RTD and mV inputs, 0.1 second for 4 ~ 20 mA and 1 ~ 5 V inputs.

Input characteristics

 Type

Range

Accuracy @ 25°C

Input Impedance

J

-120°C  ~ 1000°C( -184°F ~ 1,832°F)

±2°C

2.2 MΩ

K

-200°C ~ 1370°C (-328°F ~ 2498°F)

±2°C

2.2 MΩ

T

-250°C ~ 400°C ( -418°F ~  752°F )

±2°C

2.2 MΩ

E

-100°C ~ 900°C( -148°F ~ 1652°F )

±2°C

2.2 MΩ

B

0°C ~ 1800°C( 32°F ~  3272°F )

±2°C( 200°C ~ 1800°C )

2.2 MΩ

R

0°C ~ 1767.8°C( 32°F ~ 3214°F )

±2°C

2.2 MΩ

S

0°C ~ 1767.8°C( 32°F ~ 3214°F )

±2°C

2.2 MΩ

N

-250°C ~ 1300°C( -418°F ~ 2372°F)

±2°C

2.2 MΩ

L

 -200°C ~ 900°C( -328°F ~ 1652°F )

±2°C

2.2 MΩ

PT100(DIN)

-210°C ~ 700°C( -346°F ~ 1292°F )

±0.4°C

1.3KΩ

PT100(JIS)

-200°C ~ 600°C( -328°F ~ 1112°F )

±0.4°C

1.3KΩ

mV

-8mA  ~ 70mA

±0.05%

2.2MΩ

mA

-3mA  ~ 27mA

±0.05%

70.5Ω

V

-1.3V  ~ 11.5V

±0.05%

650KΩ
Output 1  / Output 2

Relay Rating

2A,240V AC,200000 Life Cycles for Resistive Load

Pulsed Voltage

Source Voltage 5V, Current Limiting Resistance 66Ω

Linear Output Characteristics

Type

Zero Tolerance

Span Tolerance

Load Capacity

4 ~ 20 mA

3.6 ~ 4 mA

20 ~ 21 mA

500Ω max.

0 ~ 20 mA

0 mA

20 ~ 21 mA

500Ω max.

0 ~ 5 V

0 V

5 ~ 5.25 V

10 KΩ min.

1 ~ 5 V

0.9 ~ 1 V

5 ~ 5.25 V

10 KΩ min.

0 ~ 10 V

0 V

10 ~10.5 V

10 KΩ min.
Linear Output

Resolution

15 Bits

Output Regulation

0.02% for full load change

Output Settling Time

0.1 Second ( Stable to 99.9%)

Isolation Breakdown Voltage

1000 VAC

Temperature Effect

±0.01% of  Span/ °C
Triac ( SSR ) Output

Rating

1A / 240 VAC

Inrush Current

20A for a cycle

Min. Load Current

50 mA rms

Max. Off-state Leakage

3 mA rms

Max. On-state Voltage

1.5V rms

Insulation Resistance

1000 Mohms min. at 500 VDC

Dielectric Strength

2500 VAC for 1 minute
 Alarm (Output 2)

Relay Type

Form A

Maximum Rating

2A, 240VAC, 200000 Life Cycles for Resistive Load

Alarm Functions

Dwell Timer, Deviation Low, Deviation High, Deviation Band Low, Deviation Band High, Process High, Process Low

Alarm Mode

Latching, Hold, Normal, Latching/Hold

Dwell Timer

0.1 ~ 4553.6 Minutes
 Data Communication

Interface

RS-232 ( 1 unit ), RS-485 ( up to 247 units )

Protocol

Modbus RTU (Slave Mode)

Address

1 - 247

Baudrate

2.4KBPS ~ 38.4 KBPS

Data Bits

7 or 8 Bits

Parity Bit

None, Even or Odd

Stop Bit

1 or 2 Bits

Communication Buffer

160 Bytes
Analog Retransmission

Output Signal

4 ~20 mA, 0 ~ 20 mA,0 - 10V

Resolution

15 Bits

Accuracy

±0.05% of Span ± 0.0025% / °C

Load Resistance

0 to 500Ω for Current Output , 10KΩ minimum for Voltage Output

Output Regulation

0.01% for full load change

Output Setting Time

0.1 Second (Stable to 99.9%)

Isolation Breakdown

1000VAC minimum

Integral Linearity Error

±0.005% of Span

Temperature Effect

±0.0025% of Span /°C

Saturation Low

0mA or 0V

Saturation High

22.2mA or 5.55V,11.1V min

Linear Output Ranges

0 ~ 22.2mA (0 ~ 20mA / 4 ~ 20mA), 0 ~ 5.55V (0 ~ 5V, 1 ~ 5V),0 ~ 11.1V (0 ~ 10V)
User Interface

Keypad

4 Keys

Display Type

4 Digit LCD Display

No. of Display

3

Upper Display Size

0.98”(25mm)

Lower Display Size

0.55”(14mm)
Control Mode

Output 1

Reverse (Heating) or Direct (Cooling) Action

Output 2

PID cooling control, Cooling P band 50~300% of PB, Dead band -36.0 ~ 36.0 % of PB

ON-OFF

0.1 ~ 90.0 (°F ) hysteresis control ( P band = 0)

P or PD

0 ~ 100.0 % offset adjustment

PID

Fuzzy logic modified Proportional band 0.1 ~ 900.0°F, Integral time 0 ~ 3600 Seconds,Derivative time 0 ~ 360.0 Seconds

Cycle Time

0.1 ~ 90.0 Seconds

Manual Control

Heat(MV1) and Cool(MV2)

Auto-tuning

Cold Start and Warm Start

Failure Mode

Auto transfer to manual mode while sensor break or A-D Converter damage

Ramping Control

0 to 900.0°F/Minute or 0 to 900.0°F/Hour Ramp Rate
Digital Filter

Function

First Order

Time Constant

0,0.2, 0.5, 1, 2, 5, 10, 20, 30, 60 Seconds Programmable
 Environmental and Physical Specifications

Operating Temperature

-10°C ~ 50°C

Storage Temperature

-40°C ~ 60°C

Humidity

0 ~ 90 % RH (Non-Condensing)

Altitude

2000 Meters maximum

Pollution

Degree II

Insulation Resistance

20MΩ minimum(@500VDC)

Dielectric Strength

2000VAC,50/60 Hz for 1 Minute

Vibration Resistance

10 to 55 Hz , 10m/s2 for 2 Hours

Shock Resistance

200 m/s2(20g)

Moldings

Flame Retardant Polycarbonate

Mounting

Panel

Dimensions (W*H*D) (mm)

48*48*94

Depth Behind Panel (mm)

86

Cut Out Dimensions (mm)

45*45

Weight (grams)

140
Approval Standards

Safety

UL61010C-1, CSA C22.2 No.24-93, EN61010-1 ( IEC1010-1 )

Protective Class

IP30 for Panel,IP20 for terminals and housing, all indoor use

EMC

EN61326

Download

C21&C91_Brochure_092826_EN

C21&C91_Brochure_101108_CH
C21&C91_UserManual_UM0C911H_EN
Software_BC_Set_2.0​
Software_BC_Set_Pro_V1.1.0.12(Firmware above V33)​

C21&C91_UsersManual_UM0C911H_EN

Data_Logger_Firmware_XH10_v1.1.0.34​

Software_BC_Set_Pro_V1.1.0.12_2.0​
Software_DAQ_V2.73(2501)*1-hour trial only

Training_Demo_Data_Acquistion_Studio

UMEIO01A​
UMEIO01A​

IO_Brouchure_Ver.1.4/

Visit Download Center to See More Documents & Tools of This Product.     Visit

FAQ

What is the panel size and installation cutout for the C91?

The C91 features a 1/16 DIN housing with a standard panel cutout size of 48 mm x 48 mm. It is designed for compact equipment and control panel integration.

Does the C91 support auto-tuning for PID control?

Yes. The C91 includes auto-tuning with fuzzy logic to automatically optimize PID parameters based on process behavior, ensuring stable temperature control with minimal overshoot.

What types of input signals can the C91 accept?

C91 accepts thermocouples (J, K, T, E, N, R, S), RTDs (PT100 DIN/JIS), and analog inputs like 0–50 mV, 4–20 mA, 1–5V, offering wide application compatibility.

What output types are available on the C91 controller?

The C91 offers configurable outputs including relay, SSR voltage drive, and analog output (0–20 mA, 4–20 mA, 0–10V), with 15-bit resolution for precision retransmission.

Can the C91 be connected to a PC for parameter setup?

Yes. The USB programming port allows connection to a PC for setup, calibration, and testing, and the controller also supports RS-232 and RS-485 (Modbus RTU) communication.

Ordering Code

單獨的電子郵件地址用逗號區分.
Submit
將其替換為您自己的 HTML 代碼