Brainchild BTC-704 Digital & Analogue Controller
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btc-404 analogue controller
BTC-404 Side view
BTC-404 Back view
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btc-404 analogue controller
BTC-404 Side view
BTC-404 Back view

BTC-404 – 96 x 96mm Analogue Controller w/ digital display

Brand:

$310.00 Excl. GST

Model *

Standard settings: Power input: 90~264Vac, Relay, rated 5A / 240Vac, Deviation alarm relay output, rated 2A / 240Vac max.

Signal Input *

Range *

Total: $310.00

All prices are in NZ$, and GST exclusive and are subject to change without notice.

Product Details

Compact PID Process Controller

The BTC-404 is a panel-mount fuzzy PID controller that delivers reliable temperature and process control in a compact 1/4 DIN (96×96 mm) format. It supports thermocouple (J/K) and RTD (PT100) inputs and offers ON/OFF or time-proportional control. With features such as deviation alarm, high-visibility LED display, and selectable output types (relay, SSR, or analogue), this controller is ideal for integration into industrial heating, cooling, and automation systems.

Panel Interface and Display

The BTC-404 features a 0.5-inch red 3-1/2 digit LED display, providing excellent readability of process values even in low-light industrial settings. The panel includes ON (red) LED lamps to indicate output status and alarm conditions, helping operators monitor real-time operation at a glance. A precise analogue dial knob allows smooth adjustment of the control setpoint, ensuring accuracy and convenience during parameter setup.

Designed with simplicity and reliability in mind, the BTC-404 panel interface reduces operator error and supports quick configuration without complex menus or programming steps. This design makes it ideal for OEM and system-integrated temperature control environments.

Wide Compatibility

Thermocouple and RTD support with high accuracy

BTC-404 supports Type J and K thermocouples as well as 3-wire PT100 RTDs (DIN or JIS standard). The input system features ±1% of span accuracy and cold junction compensation for thermocouples. It also includes upscale detection for sensor break and excellent noise immunity, ensuring stable performance in challenging industrial environments.

BTC-404 Features:

  • Universal inputs: J/K T/C, PT100 RTD
  • Wide span range up to 1200°C available
  • Stable control with fuzzy + PID logic
  • ±1% full scale accuracy for precise control
  • Built-in Laser Trim ASIC for high stability
  • 90–264VAC wide-range power input
  • LED display with compact panel mount
  • Sensor break protection with upscale detection
  • Auto/manual tuning for flexibility
  • Large 1/4 DIN size (96×96mm)

Technical Specs

INPUT
Thermocouple (T/C)Type J, K
RTD3-wires PT 100 ohms, DIN or JIS
RangeSee ordering information
Accuracy±2% of span (BTC-702, BTC-701),
±1% of span (BTC-704)
Cold Junction Compensatin±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
CONTROL
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
OUTPUT
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
ADJUSTMENT
Set pointSingle turn wirewound potentiometer
AlarmDeviation alarm, adjustable ±10% of span
Manuel 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
INDICATION
Process IndicatorBTC-402 : Deviation meter
BTC-404: 0.5” red 3-1/2 dight LED display
Status IndicatorON red LED Lamp
Alarm IndicatorON red LED Lamp
POWER
RatingBTC-402,
BTC-401: 100-130VAC or 200-240VAC,50 / 60Hz
ConsumptionLess than 5VA
ENVIRONMENTAL & PHYSICAL
Operating Temperature0-50°C
Humidity0 to 90% RH (non-codensing)
Insulation20M ohms min. (500VDC)
BreakdownAC2000V, 50/60Hz, 1 minute
Vibraton10-55Hz. amplitude 1mm
Shock200 m/s² (20g)
WeightBTC-404: 280 grams,
BTC-402: 360 grams,
BTC-401: 330 grams
Dimension96(W)X96(H)X53mm (depth behind panel)
Panel cutout92 X 92mm

Ordering Information

BTC-404-(1)-(2)-(3)-(4)-(5)-(6)-(7)-(8)
Type Code Specification
(1) Power Input 4 90-264VAC
9 Other
(2) Signal Input 1 Type J thermocouple
2 Type K thermocouple
3 PT 100 ohm DIN
4 PT 100 ohm JIS
9 Other
(3) Range Code Selected Solder GAP
2 0~100°C A 50~20°F J3
3 0~200°C B 50~40°F J4
4 0~300°C C 50~55°F J5
5 0~400°C D 50~750°F J6
E 50~850°F J7
6 0~600°C F 50~1100°F J8
7 0~800°C G 50~1400°F J9
8 0~1200°C H 0~2200°F J10
9 Other K 50~199.9°F
L 0~99.9°C
M 0~199.9°C
(4) Control Mode J11
1 ON-OFF Short
2 P ( proportional) Open
(5) Output I 1 Relay, rated 5A/240VAC resistive
2 Pulsed voltage to drive SSR, rated 20mA/24V
3 4-20mA linear, max. load 500 ohms
4 0-20mA linear, max. load 500 ohms
5 0-10V linear, min. load 500k ohms
9 Other
(6) Output II 0 None
(7) Alarm 0 None
9 Deviation alarm relay output, rated
2A/24OVAC max. resistive load
(8) Communication 0 None

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