Signal Consulting, LLC 

Model Si24BdTETRC1-12BSD-50V-20A 

   Field Programmable, 12-Bit, Bi-directional, Thermo-Electric (TE), Temperature-Range Controller with Aluminum Plate Heat Sink, Serial LCD Port, and with an RS232 Data-Logging/Programming Port





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Si24BdTETRC1-12BSD-50V-20A Features:

Temperature Control: 12-Bit, Bi-directional Temperature- Range Controller in the -550C to +1250C Range with 0.0650C steps. The word "Bi-directional" implies that no wire reversal is required on the TE cell to accomplish the heating and cooling task.

Efficient H-Bridge with PWM: 750Hz Pulse-Width Modulation (PWM) is used to perform the heating and cooling function (at the same time) on a Peltier type (TE) cell, functioning as a bidirectional heat-pump.

One Digital Temperature Sensor: Digital Temperature Sensor with 0.06250C Resolution and 1/20C Accuracy  in the -100C to +800C  Range, and approx.  10C Accuracy in the -550C to +1250C  Range.

Temperature Sampling Rate:  The temperature is sampled at approximately 1Hz rate and the control-loop/display is updated with this same rate.

An LCD Port: For Parameter and for Measured-Temperature Display with Centigrade scale.

An RS232 Data Port: For Programming and for Data Logging.

Field Programmable: The control parameters can be changed with Up, Down, Next Keys or with the RS232 Data Port.

Alarm Kill Switch on J1: A normally open switch (or an Open Collector npn Transistor) can be connected to jumper port J1 (as shown below), J1 Open=Normal operation, J1 Short=Load (TE Cell) is open.

Voltage Requirement: VP (from pin +P to pin - P): 12V to 50V DC, unregulated DC voltage.

High Power-Efficiency: 98.5% typical, at 50V and 20A

Max Load Power: 1000W at 50V, 20A.

Max Operating Temperature: +450C with the Integrated AP1 Aluminum Plate Heat Sink Heat Sink, as shown.
Power Semiconductors: Four 90A Hex-MOSFETs
Overall Dimensions: 4.0" x 3.3" x 1.4" (102 x 84 x 34mm).
Components Type: 100% Solid State, NO Relays

On Board:
Optically Isolated Control Signals
Filter Capacitors, Voltage Transient Suppression (VTS) diodes.
Bicolor LED Indicator,  (Red=Hot, Green=Cold) 
The board is protected by a fast-acting 20A Mini Fuse (DigiKey Part#: F993-ND).


 For Details, Download the  Si24BdTETRC1-12BSD-50V-20A-6Y1    Manual


The Si24BdTETRC1-12BSD-50V-20A is a 50V, 20A, microprocessor based, Field Programmable, Bi-directional, Thermo-Electric, Temperature-Range Controller  that heats or cools a thermal-zone (using an H-bridge and one Thermo-Electric (TE) cell) whenever the measured temperature (MT) is outside of the user-selectable temperature Limit Ranges (L, l, h, H). An efficient onboard high-power H-bridge controls the current (in the 0 to +/- 20A range) to a Peltier type Thermo-Electric (TE) cell, functioning as a bi-directional heat-pump. The word "Bi-directional" implies that no wire reversal is required on the TE cell to accomplish the heating and cooling task. The temperature is measured with a 12-bit digital sensor and controlled with 0.06250C steps in the -550C to +1250C range. This controller has two operating modes: Program-Mode and Run-Mode. In the “Program-Mode” with Jumper J2 pins open circuited (J2=Open), seven control parameters are interactively selected and saved in nonvolatile memory. In the “Run–Mode”, with Jumper J2 pins short circuited (J2=Short), the board functions as a Bi-directional Temperature-Range Controller as directed by the seven programmed parameters. The control action is defined on Figure1. Note that there are 4 Field Programmable Temperature Limit Values (L, l, h, H) used to control the heating/cooling action of the thermo-electric (TE) cell. The control action includes a low-side (L to l) region and a high-side (h to H) region. These are Hysteresis regions, preventing excessive temperature-control chatter. An LCD port (with 9600 Baud RS232 Interface Standard) is provided to display the Temperature-Limit values and the Measured Temperature data. In addition, a Full-Duplex, 9600 Baud, RS232 Data Port (on CN5) is also provided, used in both operating modes.

Control Action of the Si24BdTETRC1-12BSD-50V-20A

 Figure 1

Application Drawing of the Si24BdTETRC1-12BSD-50V-20A

In this 12-bit, temperature-range control application (diagram shown below), this controller heats or cools a thermal-zone (using one Thermo-Electric (TE) cell) whenever the measured temperature (MT) is outside of a user-selectable temperature Limit Range (specified by L,.. H). The Peltier type Thermo-Electric (TE) cell is functioning as a bi-directional heat-pump. It can be purchased from: The temperature of the enclosed and insolated Hot/Cold Environment is measured with the Dallas Semi. DS18B20 Digital Thermometer (in TO-92 casing). This sensor can be purchased from Signal Consulting, LLC as Si24DTsens-12B (DS18B20 with 12” leads and connector). The optional LCD module can be ordered from Signal using the part number of Si14LCD2L16CH-4PC  (2-Line by16-Character display with 16” cable and 4-pin connectors, and with back-light). A wide variety of unregulated linear and switching power supplies can also be used with this controller. Consult the most recent catalog on to purchase these power supplies.  Warning:  The connecting wires to the Load and the Power Supply must be heavy gauge copper wire (#12 AWG or heavier) to handle the rated current level. In addition, these heavy gauge wires act as a heat sink, protecting the board from overheating.

 For Details, Download the  Si24BdTETRC1-12BSD-50V-20A-6Y1    Manual


Si24BdTETRC1-12BSD-50V-20A, 12-Bit Digital Thermo-Electric  Temperature-Range Controller.  
Price $229.00

Note: The Si24BdTETRC1-50V-20A can be operated in different applications. You need to order different accessories depending on your application. The Si24DTsens-12B  12-Bit Digital Thermometer is always required but the other accessories are optional. In each of the applications, the board can be programmed; and the current data can be displayed or logged. 

PC Application:  The board is connected to a 9600 Baud full-duplex ASCII controller (typically a PC or laptop computer, using a HyperTerminal or Putty type program); you only need to order the Si24DB9cable-3FM  RS232 cable.

LCD Application: The board is connected to the Si14LCD2L16CH-4PC   (2-Line by 16-Character Serial LCD) and programmed with the Si24PB2-MC3  Push-Buttons.

Si3HIA Application: The board is connected to the Si3HIA-UD Human Interface Accessory,  that includes a 2-line by 16-character, transflective, serial LCD with back lighting, a 5k Ohm 10 Turn Potentiometer and 3-push buttons (Up, Down and Next) mounted on a 3 by 4 inch PCB board.

Si24DTsens-12B   12-bit Digital Thermometer ( -550C to +1250C Range, in 0.0650C Steps ) with 12" leads and 3pin Molex Connector. 
Price $39.00
Si14LCD2L16CH-4PC  Optional 2 Line by 16 Character Serial LCD with 12" long cable and 4-pin Connector.  
Price $59.00
Si24PB2-MC3   Two Push-Buttons with 12" lead and with a 3-pin FM Molex Connector.
Price $29.00
Si3HIA-UD Human Interface Accessory, includes a 12 inch long ribbon cable with 8-pin connectors.
Price $79.00
Si24DB9cable-3FM  RS232 cable, 1m long with connectors.
Price $19.00

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Availability: We usually ship in 2-3 business days.



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