Brainchild BTC-701,702,704 Analog Controller

This analog controller is used for simple applications with on/off or P control, without 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 (BTC-704, BTC-702 Only)
  • Low Cost
  • EMC, LVD: CE

  Another Article:



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


SetpointSingle turn wire wound potentiometer
AlarmDeviation alarm, adjustable ±10% of span
Manual ResetAdjustable 2.6% of span (BTC-704, 702 only)
Resolution of set point0.2% of span
Accuracy of set point±2% of span
Repeatability of set point±0.1 % of span


Process IndicatorBTC-702: Deviation meter
BTC-704: 10mm red 3-1/2 dight LED display
Status IndicatorON red LED Lamp
Alarm IndicatorON red LED Lamp


  • Rating: 90-240VAC, 50 / 60 Hz
  • Consumption: Less 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-704: 240 grams,
BTC-702: 320 grams,
BTC-701: 290 grams
Dimension72(W)X72(H)X65mm (depth behind the panel)
Panel cutout68 X 68mm