FREQUENT QUESTIONS TO OUR OEM TEMPERATURE CONTROLLERS
On this page you will find detailed answers to the most frequently asked questions related to our built-in (OEM) temperature controllers.
What are the built-in temperature controllers of the BTC-OEM series used for?
The BELEKTRONIG built-in temperature controllers of the BTC-OEM series serve similar to our laboratory temperature controllers the purpose of highest-precision control of heating and Peltier elements. As OEM component wit a wide range of functionality, they are used in numerous professional laboratory and analytical instruments.
Why are the BELEKTRONIG controllers always the first choice for controller solutions in scientific instruments?
Our built-in temperature controllers have been specifically designed for sophisticated scientific and medical measuring equipment – for devices where in addition to controlling the temperature, other parameters such as safety measures, or valve control, as well as the detection and evaluation of operating conditions are needed.
Coming as OEM component, they are compact, reliable and durable. Our built-in temperature controllers offer a high operating comfort and numerous additional functions. In your application our controllers will integrate seamlessly with manageable installation effort.
What are the key features of the benchtop temperature controllers of the BTC-LAB series?
Temperature controller module with extended peripherals: analogue inputs; Digital IO for LED, TTL-IO, relay; display output
PWM control output up to 36 V, 10 A
Fan control 0…12 V, 0.3 A
Freely usable command set
Communication via simple ASCII protocol
USB interface, serial interface
Including PC software BTC Soft, USB driver, LabView VIs
Can the built-in temperature controller also be controlled via a serial UART interface?
Yes, besides the USB interface, there is also a UART interface (voltage level: 0 V, 5 V) available.
Can the built-in temperature controller also be controlled via a serial RS232 interface?
Yes, this is possible. In this case one can use the UART interface along with a level converter. The level converter converts the level voltage of the UART interface from 0 V and 5 V to the 0 V and 15 V that are required by RS232.
Does BELEKTRONIG also offer a RS232 level converter?
Yes, we can delifer a RS232 level converter on request.
What are the advantages and disadvantages of PWM and DC?
Pulse Width Modulation (PWM) is the standard method for power setting, as it is cost-effective and easy to implement in the hardware.
The disadvantage is that the voltage level always fluctuates between 0 and the supply voltage of the power supply (e.g., 0 and 24 V). Especially when using Peltier elements, the maximum allowable operating voltage (e.g., 18V) often does not match the available power supply voltages (e.g., 15V or 24V). In addition, a PWM signal may cause EMC problems due to the high frequency spectral components when transmitted over longer cables.
If you want to control the temperature with a DC signal, BELEKTRONIG offers a suitable output filter, which converts the PWM signal into a DC signal.
Is it true that Peltier elements should not be controlled with a PWM signal?
So generally spoken, this is not correct. It depends on the PWM frequency. If a DC voltage is applied to a Peltier element, temperature differences occur between the hot and cold side of the element. This leads to mechanical stresses and bendings in the Peltier element. If, for example, the DC voltage is changed to 0 V after one minute, these mechanical stresses are reduced again. If you are operating a Peltier element with an ON/OFF regulator that has switching cycles in the seconds and minutes range, this actually has a negative effect on the lifetime of this element.
Since Peltier elements are thermally inert this problem does not exist while operating a Peltier element with PWM frequencies in the kHz range. The PWM frequency of the BELEKTRONIG temperature controllers is 20 kHz, so there is no risk of a shortened lifetime.
If one now controls a Peltier element with a built-in temperature controller and the BOF output filter from BELEKTRONIG, the DC control voltage changes in the mV and μV range (no ON/OFF operation). Thus, there is also no risk of shortened lifetime with this type of application.
Which cycle stability do the Peltier elements of BELEKTRONIG have?
The Peltier elements PE-10-01 and PE-20-01 from BELEKTRONIG have a cycle stability of 60.000 cycles. This was testet by the manufacturer with the following cycles: 60 s on / 60 s off.
Which is the best type of signal for power setting?
Which type of signal is best for power setting depends on the existing application.
The use of a PWM signal is optimal if there are no special requirements related to the electromagnetic compatibility (EMC).
One should use a DC signal for power setting, if there is the possiblity, that the electromagnetic currents, that are always surrounding a PWM signal, might affect the sample material.
Are you able to implement customized special functions in your controllers?
Our controllers can be extended at any time to your individually required functions. Depending on the type of special function (e.g., implementation of a specific sensor curve), we will create suitable firmware updates. It is also possible to develop additional modules according to your requirements.
Will customized functions be integrated in all controllers?
Usually not, because these special functions are only needed by your application.
How can I order a temperature controller with a customized function?
You can get your controllers with your individual firmware while noting the desired firmware number within your purchase order.
How is it possible to control the temperature of different sample areas independently?
Each temperature controller of BELEKTRONIG cames with one single control output channel. Therefore you for each sample area a single temperature controller for individual temperature control. Due to the multi-channel option all single controllers can be connected set and read by on USB connector.
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