Brainchild BTC-803 and BTC-805 Analog Controller


This analog controller is used for simple applications with on/off or P control, with deviation indication.


  • Build-in Laser Trim ASIC
  • Easy to change the range
  • ON-OFFor time proportional selectable
  • Compact, only 65mm in depth
  • A wide selection of control output option
  • A wide selection of ranges
  • Sensor break protection
  • Alarm option
  • Low Cost

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Thermocouple (T/C)Type J, K
RTD3-wires PT 100 ohms, DIN or JIS
RangeSee ordering information
Accuracy±2% of span (BTC-803),
±1% of span (BTC-805)
Cold Junction Compensation±0.1°C / 1°C
Rejection of RTD Lead Resistance( 0.1°C - 0.025% of PV reading) / ohm
Sensor Break ProtectionUpscale
External Resistance100 ohms max.
Normal Mode Rejection60 dB
Common Mode Rejection120 dB
Sample Rate3 times / second


Proportion Band2.2% of span
ON-OFF Hysteresis1 % of span
Cycle Time20 seconds for relay output, 1 second for pulsed voltage output, 0.02 second for linear current or voltage output.
Control ActionReverse action


ControlRelay 5A / 240V max. resistive load
Pulsed Voltage20mA / 32VDC max.
Current4-20mA, 0-20mA, max. load 500 ohms
Voltage0- 10V, min. load 500k ohms
AlarmRelay output, 2A / 240VAC max. resistive load


Setpoint3-digit or 4-digit switch
AlarmDeviation alarm, adjustable ±10% of span
Manual ResetAdjustable 2.6% of span
Resolution of set point1 LSD ( Least Significant Digit)
Accuracy of set point±1%of span
Repeatability of set point±1 LSD


Process IndicatorBTC-803: Deviation meter,
BTC-805: 0.4" red LED display
Status IndicatorON red LED Lamp
Alarm IndicatorON red LED Lamp


RatingBTC-803 : 100-130VAC , 50 / 60Hz or 200-240VAC, 50/60Hz
BTC-805: 90-240VAC, 50/60Hz
ConsumptionLess than 5VA

Environmental & Physical

Operating Temperature0-50°C
Humidity0 to 90% RH (non-condensing)
Insulation20M ohms min. (500VDC)
BreakdownAC2000V,50/60Hz,1 minute
Vibration10-55Hz,amplitude 1mm
Shock200 m/s² (20g)
WeightBTC-803: 270 grams,
BTC-805: 220 grams
Dimension48(W)X96(H)X65mm (depth behind the panel)
Panel cutout45 X 92mm