Brainchild BTC-405 Analog Controller

This analog controller is used for simple applications with on/off or P control, switch setting and digital display.


  • Build-in Laser Trim ASIC
  • Easy to change the range
  • ON-OFFor time proportional selectable
  • Compact, only 53mm in depth
  • A wide selection of control output option
  • A wide selection of ranges
  • Sensor break protection
  • Alarm option
  • Low Cost
  • Safety: UL, cUL
  • EMC, LVD: CE



Thermocouple(T/C) Type J, K
RTD 3-wires PT100 ohms, DIN or JIS
Range See ordering information
Accuracy ±1% of span
ColdJunction Compensation ±0.1°C / 1°C
Rejection of RTD Lead Resistance ( 0.1°C -0.025% of PV reading) / ohm
Sensor BreakProtection Upscale
ExternalResistance 100 ohms max.
Normal ModeRejection 60 dB
Common mode rejection 120 dB
Sample Rate 3 times /second


ProportionBand 2.2% of span
ON-OFFHysteresis 1 % of span
Cycle Time 20 seconds for relay output, 1 second for pulsed voltage output, 0.02 second for linear current or voltage output.
ControlAction Reverse action


Control Relay 5A /240V max. resistive load
PulsedVoltage 20mA / 32VDCmax.
Current 4-20mA,0-20mA, max. load 500 ohms
Voltage 0- 10V, min.load 500k ohms
Alarm Relay output, 2A / 240VAC max. resistive load


Setpoint 3-digit or4-digit switch
Alarm Deviationalarm, adjustable ±10% of span
ManuelReset Adjustable2.6% of span (BTC-404, 402 only)
Resolution of set point 1 LSD (LeastSignificant Digit)
Accuracy offset point ±1% of span
Repeatability of set point ±1 LSD


ProcessIndicator 0.5” red3-1/2 dight LED display
StatusIndicator ON red LEDLamp
AlarmIndicator ON red LED Lamp


  • Rating: 90-240VAC,50 / 60 Hz
  • Consumption: Less than5VA


operating temperature 0-50°C
Humidity 0 to 90% RH(non-condensing)
Insulation 20M ohms min. (500VDC)
Breakdown AC2000V,50/60Hz,1 minute
Vibration 10-55Hz,amplitude 1mm
Shock 200 m/s²(20g)
Weight 250 grams
Dimension 96(W)X96(H)X53mm(depth behind the panel)
Panel cutout 92 X 92mm