Brainchild C72 Temperature Controller

The new generation low cost PID microprocessor-based with Fuzzy logic controller series incorporate two bright easy to read LCD Displays which indicates Process value (PV) and Set point value (SP). The Fuzzy Logic technology incorporated on this series controllers enables a process to reach the predetermined set point in the shortest time with minimum of overshoot during Start up (Power ON) or external load disturbances.




BrainChild Electronics Co., Ltd. was established in 1977. Presently we are the largest Temperature Controller maker in Taiwan, and the only maker of the paperless recorder in Taiwan.

The factory has a full automatic SMT production line. TÜV Rheinland certifies our ISO9001 once a year. In addition we have a well equipped and CSA certified laboratory to do CSA, UL and CE tests. A strong and experienced R&D team allows us to offer customers innovative and state-of-art industrial instruments for various FA solutions. We have won good reputation by supplying quality instruments with better features at competitive prices. It is our philosophy in pursuit of perfection through continuous improvement.





Power Supply 90 to 250 VAC, 47–63 Hz ; 11 to 40 VDC / 20 to 28 VAC, 47– 63 Hz
Power Consumption 12VA, 6W maximum
Signal Input
Type Thermocouple(J,K,T,E,B,R,S,N,L,U,P,C,D), RTD(PT100(DIN), PT100(JIS)), Current(mA),Voltage(Volts)
Resolution 18 Bits
Sampling Rate 5 Times / Second (200msec)
Maximum Rating -2VDC minimum, 12VDC maximum
Input Characteristics
Type Range Accuracy @ 25°C Input Impedance
J -120°C  to 1000°C( -184°F to 1,832°F) ±2°C 2.2 MΩ
K -200°C to 1370°C (-328°F to 2498°F) ±2°C 2.2 MΩ
T -250°C to 400°C ( -418°F to  752°F ) ±2°C 2.2 MΩ
E -100°C to 900°C( -148°F to 1652°F ) ±2°C 2.2 MΩ
B 0°C to 1820°C( 32°F to  3308°F ) ±2°C( 200°C to 1800°C ) 2.2 MΩ
R 0°C to 1767.8°C( 32°F to 3214°F ) ±2°C 2.2 MΩ
S 0°C to 1767.8°C( 32°F to 3214°F ) ±2°C 2.2 MΩ
N -250°C to 1300°C( -418°F to 2372°F) ±2°C 2.2 MΩ
L -200°C to 900°C( -328°F to 1652°F ) ±2°C 2.2 MΩ
U -200°C to 600°C (-328°F to 1112°F) ±2°C 2.2 MΩ
P 0°C to 1395°C( 32°F to 2543°F ) ±2°C 2.2 MΩ
C 0°C to 2300°C( 32°F to 4172°F ) ±2°C 2.2 MΩ
D 0°C to 2300°C( 32°F to 4172°F ) ±2°C 2.2 MΩ
PT100(DIN) -200°C to 850°C( -328°F to 1562°F ) ±0.4°C 1.3KΩ
PT100(JIS) -200°C to 600°C( -328°F to 1112°F ) ±0.4°C 1.3KΩ
mA -3mA  to 27mA ±0.05% 2.5Ω
V -1.3V  to 11.5V ±0.05% 1.5MΩ
Temperature Effect 1.5µV /°C for all inputs except mA input, 3.0µV /°C for mA
Sensor Lead Resistance Effect Thermocouple: 0.2 µV /Ω; 3-wire RTD: 2.6°C /Ω of Difference of Resistance of two leads 2-wire RTD: 2.6°C /Ω of Sum of Resistance 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 Thermocouple and RTD inputs, sensor short for RTD  input , below 1mA for 4-20mA input, below 0.25V for 1 – 5V input, not available for other inputs
Sensor Break Responding Time Within 4 seconds for Thermocouple and RTD inputs, 0.1 second for 4-20mA and 1 – 5V inputs
Remote Set Point Input
Type Linear Current,Linear Voltage
Range -3mA to 27mA,  -1.3V  to 11.5V
Accuracy ±0.05 %
Remote Set Point  Option Available
Input Impedance Current: 2.5Ω, Voltage:1.5MΩ
Resolution 18 Bits
Sampling Rate 1.66 Times/Second
Maximum Rating 280mA maximum for Current Input, 12VDC maximum for Voltage Input
Temperature Effect ±1.5µV/°C for Voltage Input , ±3.0µV/°C for Current Input
Sensor Break Detection Below 1mA for 4-20mA input, below 0.25V for 1 – 5V input, not available for other inputs
Sensor Break Responding Time 0.1 Seconds
Event Input
No. of Event Inputs 2
Logic Low -10V minimum, 0.8V maximum.
Logic High 2V minimum, 10V maximum
Functions See availability table in user manual
CT Input
CT Type CT98-1
Accuracy ±2%of Full Scale Reading, ± 1 digit maximum
Input Impedance 294Ω
Measurement Range 0 to 50A AC
Output of CT 0 to 5V DC
CT Mounting Screw Mounting
Sampling Rate 1 Time/Second
Output 1 /Output 2
Type Relay,Pulsed Voltage,Linear Voltage and Linear Current
Relay Rating 2A,240V AC,200000 Life Cycles for Resistive Load
Pulsed Voltage Source Voltage 5V,Current Limiting Resistance 66Ω
Linear Output Resolution 15 Bits
Linear Output Regulation 0.02% for full load change
Linear Output Settling Time 0.1 Second ( Stable to 99.9%)
Isolation Breakdown Voltage 1000 V AC
Temperature Effect ±0.01% of  Span/ °C
Load Capacity of Linear Output Linear Current: 500Ω maximum, Linear Voltage: 10KΩ  minimum
Relay Type Form A
Maximum Rating 2A,240V AC,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 to 4553.6 Minutes
Data Communication
Interface RS-485
Protocol Modbus RTU (Slave Mode)
Address 1 to 247
Baudrate 2.8KBPS to 115.2 KBPS
Parity Bit None, Even or Odd
Stop Bit 1 or 2 Bits
Data  Length 7 or 8 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 0.58”(15mm)
Lower Display Size 0.32”(8.3mm)
Programming Port
Interface Micro USB
PC Communication Function Automatic Setup, Calibration and Firmware Upgrade
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 to 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
Availabiity Option
No of Segments/Program 4 / 8 / 16
Environmental and Physical Specifications
Operating Temperature -10°C to 50°C
Storage Temperature -40°C to 60°C
Humidity 0 to 90 % RH (Non-Condensing)
Altitude 2000 Meters maximum
Pollution Degree II
Insulation Resistance 20MΩ minimum(@500V DC)
Dielectric Strength 2000V AC,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) 72*72*59
Depth Behind Panel (mm) 50
Cut Out Dimensions (mm) 68*68
Weight (grams) 190

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