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RE22-121000 Temperature Controller – Made in Poland – internal view

p.kaczmarek2 1140 17

TL;DR

  • Opens the RE22-121000 temperature controller, a tiny Polish-made module with a four-digit display, four indicators and three buttons for industrial temperature stabilization.
  • Inside, four laminate boards fit together with pin headers or soldered joints, and the design uses mostly SMD parts plus some through-hole components.
  • An Atmega32 handles control, alongside a TEZ 2.5/D BREVE-FUFVASSONS Art 16009-9984 transformer, a 78M05 regulator, and individual LSD3155-20 display digits.
  • The measurement section includes an LM358, HCF4051, TL431 and an unrecognized 2252A chip, while a programming port suggests the board could support a DIY project.
  • Solder joints still carry flux residue, and one capacitor looks slightly swollen, though the module itself might still be workable.
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  • RE22-121000 Temperature Controller – Made in Poland – internal view
    I always look with curiosity at devices signed as Made in Poland, and this was also the case here. This tiny module with a four-digit display, four lights and three buttons is a temperature controller. According to the manufacturer, it is designed for use in the plastics industry, food industry, drying industry and anywhere else where temperature stabilisation is required.
    RE22-121000 Temperature Controller – Made in Poland – internal view RE22-121000 Temperature Controller – Made in Poland – internal view RE22-121000 Temperature Controller – Made in Poland – internal view
    The device works with resistance temperature sensors, thermocouples and standard analogue signals. Control can be performed in simple on/off mode with hysteresis or using a PID algorithm, the parameters of which can be set manually or selected automatically thanks to the auto-adaptation function. The relay output allows the direct control of small consumers and the settings can be password-protected. The entire unit is enclosed in an IP65-rated enclosure, supplied from typical mains voltages.
    RE22-121000 Temperature Controller – Made in Poland – internal view RE22-121000 Temperature Controller – Made in Poland – internal view RE22-121000 Temperature Controller – Made in Poland – internal view
    We take a look inside to find out the secret of the compact design. The whole thing is made up of not one, but four laminate boards, cleverly fitted together on pin joints or simply soldered together (front panel with base). Primarily surface mount is used, although through-hole components are also available.
    RE22-121000 Temperature Controller – Made in Poland – internal view RE22-121000 Temperature Controller – Made in Poland – internal view RE22-121000 Temperature Controller – Made in Poland – internal view
    The display is made up of separate digits - the LSD3155-20. The construction of the whole appears to be fairly simple and does not include unusual components such as a dedicated display driver with an I2C style interface.
    RE22-121000 Temperature Controller – Made in Poland – internal view RE22-121000 Temperature Controller – Made in Poland – internal view RE22-121000 Temperature Controller – Made in Poland – internal view
    The whole thing is powered by a TEZ 2.5/D BREVE-FUFVASSONS Art 16009-9984 mains transformer. As far as I can see, the power of this transformer is 2.0 VA and the voltage on the secondary side is 7.5 V.
    RE22-121000 Temperature Controller – Made in Poland – internal view RE22-121000 Temperature Controller – Made in Poland – internal view RE22-121000 Temperature Controller – Made in Poland – internal view
    In the power supply section is the immortal 78M05 stabiliser. The solder is a bit conspicuous because someone didn't clean up the rosin. It is by every point, suggesting that this is a leftover from the factory.
    RE22-121000 Temperature Controller – Made in Poland – internal view RE22-121000 Temperature Controller – Made in Poland – internal view RE22-121000 Temperature Controller – Made in Poland – internal view
    At the heart of the module is the Atmega32. This is no surprise, it's probably one of the more popular microcontroller families with us. I was a bit expecting a PIC there, but looking at our forum they are less known though. Next to the Atmega you can see four transistors to control the separate digits of the display. Next to it is also a ULN2003 - probably also to control the displays, or more precisely the segments. In the measurement section I see an LM358 (operational amplifier), HCF4051 (multiplexer), TL431 (reference voltage) and a 2252A circuit that I don't recognise. Suggestions? I'm also surprised by the extra four transistors - there are eight in total.
    RE22-121000 Temperature Controller – Made in Poland – internal view RE22-121000 Temperature Controller – Made in Poland – internal view RE22-121000 Temperature Controller – Made in Poland – internal view

    All in all, that will be about it. Apart from the solder, another capacitor caught my eye, it looks slightly faded, although the module itself doesn't have a switching power supply, so I'm a little more surprised than usual.
    The whole thing could probably be made to work, I can also see a programming port on the board, so you could make your own DIY based on this module.
    The device manual is available online, so there is nothing to discuss here.
    Have you used this type of controller?

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    About Author
    p.kaczmarek2
    Moderator Smart Home  
    Offline 
    p.kaczmarek2 wrote 14332 posts with rating 12234, helped 648 times. Been with us since 2014 year.
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  • #2 21879705
    Wawrzyniec
    Level 38  
    pawlik118 wrote:
    The transformer fuse is missing (although it is drawn on the sticker that it should be).

    And it probably is. In the transformer housing. Because it's a transformer sticker. German.
    pawlik118 wrote:
    on the sticker it is drawn that it should be

    I would read it like this: "on the sticker it is drawn, that it is ".
  • #3 21879754
    pawlik118
    Level 33  
    Just Breve is a mould from Lodz, so Poland. The transformer does not have a built-in fuse, this marking suggests that it should be protected with a fuse of the value given next to this symbol.
  • #4 21879783
    zgierzman
    Level 31  
    p.kaczmarek2 wrote:
    Everything is enclosed in an IP65-rated enclosure, powered by typical mains voltages.


    Where does this information come from? IP65 is a dust- and waterproof enclosure, and you can see from the photos that it has large ventilation slots, the buttons are not sealed, similar to the connectors on the back.
  • #5 21879792
    p.kaczmarek2
    Moderator Smart Home  
    The specifications (including IP65) are from the manufacturer's RE22 website. I can also give you the current price of the product by the way - £349.
    RE22-121000 Temperature Controller – Made in Poland – internal view
    Although the fact that it is only in the PDF that they specify that it is the front.
    RE22-121000 Temperature Controller – Made in Poland – internal view
    Helpful post? Buy me a coffee.
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  • #6 21879810
    kaz69
    Level 37  
    Datasheet excerpt for “RE22 REGULATOR” highlighting “terminal side: IP20”
    Everything is in the specification when it comes to IP 20 from the contacts and IP 65 from the front.
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  • #7 21879846
    Mateusz_konstruktor
    Level 37  
    p.kaczmarek2 wrote:
    and layout of 2252A which I do not recognise. Suggestions?

    TLC2252 made by Texas Instruments, although you might want to make sure by checking the connections on the board.
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  • #8 21879854
    Ryszard49
    Level 39  
    p.kaczmarek2 wrote:
    Have you used this type of regulator?

    RE 22 briefly, I replaced it with an ER71 regulator. Out of several hundred units fitted, only one failure. So cheap and reliable.
  • #9 21879969
    Marek Marcinek
    Level 16  
    p.kaczmarek2 wrote:
    I'm also surprised by the extra four transistors - there are eight in total.

    Four segments + four leds on the panel ;)
  • #10 21880364
    kris8888
    Level 40  
    p.kaczmarek2 wrote:
    In addition to the solder, I also noticed a capacitor, it looks slightly swollen, although the module itself does not have a switching power supply, so it surprises me a bit more than usual.

    Happens if, for example, a rectifier bridge has short-circuited or a capacitor has been running at elevated temperatures all the time.
    p.kaczmarek2 wrote:
    I always look with curiosity at devices signed as Made in Poland

    Made in Poland but unfortunately probably not a single component inside was made in Poland. Even the transformer is not Polish. Which is a shame.
    I wouldn't be surprised if the circuit boards themselves were also commissioned somewhere in a foreign company.
    p.kaczmarek2 wrote:
    with typical mains voltages.

    It always puzzles me why the 230V AC 50/60Hz designation is used on the housing when there are only a handful of countries in the world where the very unusual 230V AC 60Hz supply standard applies, and I doubt this regulator will ever be exported there.
    The more common standard for 60Hz is 110V AC.
  • #11 21880407
    pawlik118
    Level 33  
    kris8888 wrote:
    Made in Poland but unfortunately probably not a single component inside was made in Poland. Even the transformer is not Polish. A pity.


    After all, this is a transformer made by Breve - a Polish company from Lodz https://www.breve.pl/
    A much nicer company to deal with than Indel, very good quality products.
  • #12 21880418
    Mateusz_konstruktor
    Level 37  
    kris8888 wrote:
    p.kaczmarek2 wrote:
    In addition to the solder, I also noticed a capacitor, it looks slightly swollen, although the module itself does not have a switching power supply, so it surprises me a bit more than usual.

    Happens if, for example, a rectifier bridge has short-circuited, or a capacitor has been running at an elevated temperature all the time.

    I see a different factor here. These units typically run either most of the time or virtually continuously. An example of a food storage unit must provide the correct temperature whatever the circumstances. It is not unusual to operate continuously for months or even years. Meanwhile, such electrolytic capacitors have a nominal life specified at 1000, 2000 or 3000 hours of operation. In my opinion, this is where natural wear and tear has occurred. With the thesis of the reason being the increased temperature, I cannot agree. Standard electrolytic capacitors have a permissible operating temperature of 85°C.
  • #13 21880429
    kris8888
    Level 40  
    pawlik118 wrote:
    After all, this is a transformer made by Breve - a Polish company from Lodz https://www.breve.pl/

    And actually, something confused me about that company name on the transformer. I've had no contact with their products so far.

    There is also some Swedish shareholder there from what I read, but I think it's a minority one.
    Mateusz_konstruktor wrote:
    Then such electrolytic capacitors have a nominal life specified at 1000, 2000, or 3000 hours of operation. In my opinion, this is where natural wear and tear has occurred. With the thesis of the reason being the increased temperature, I cannot agree

    It is just that natural wear and tear in the temperature range generally manifests itself as drying out or leakage of electrolyte through the seals around the leads and consequent loss of capacity. The capacitor casing is rarely swollen in this way, unless the capacitor belongs to a so-called "black list" of capacitors with a faulty electrolyte which has caused this type of effect.
  • #14 21880497
    Ryszard49
    Level 39  
    Mateusz_konstruktor wrote:
    It is not unusual to operate continuously for months or even years. Meanwhile, such electrolytic capacitors have a rated life of 1000, 2000, or 3000 hours of operation.

    The regulators I have installed have been in service for over 20 years, at a minimum of 10 hours a day.
  • #15 21881001
    pawlik118
    Level 33  
    The service life of a capacitor, e.g. 2000h (4 months), is determined for the maximum operating temperature and with a slight deterioration in parameters (capacitance and ESR). Reducing the temperature by 10 degrees increases the life by 2x. That is, for operation at 40C, there should be an estimated 128,000h (14 years). Nevertheless, in this circuit the capacitor conducts almost all the current as it is charged in the sine peaks and discharged all the time, although the current should not be large because the trafko is low power. I also happened to have a whole series of Samxons which all "exploded" well below the estimated life, just some manufacturing defect in the capacitors.
    https://www.megastar.com/content/pdfs/RMU_Series.pdf
  • #16 21881312
    Mateusz_konstruktor
    Level 37  
    I come with specifics.
    @pawlik118
    Daewoo Electronics is the name used since March 2006.
    However, there was Partsnic between that date and December 2000.
    It is also possible that the Partsnic logo was temporarily used just after the name change to Daewoo, and which is the logo on the unit in question.
    We are not sure if any of the technical data has not also been changed.
    Here we have a Partsnic-branded capacitor, a product of the company of the same name and operating in South Korea.
    The model is an RMU, designed for a maximum temperature of 105°C.
    The so-called load life is 2000h at 105°C.
    There is also an important piece of data here: this is a product from some twenty years ago, with many consequences.

    kris8888 wrote:
    Only that natural wear within the permissible temperature range generally manifests itself as drying out or leakage of the electrolyte through the seals around the leads and consequent loss of capacity.

    This is exactly what worn out, or even damaged, electrolytic capacitors encountered by me in domestically manufactured products from many years ago look like. I am referring here to all sorts of "Unitry and Kasprzaks". Meanwhile, in western products, I find such specimens bulging at the top, and this in transformer power supplies. There must be some detail in the design of old Polish capacitors, although this has never been the subject of my research.
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FAQ

TL;DR: For engineers, repair techs, and DIY users, the RE22-121000 is a compact 4-board temperature controller with a 4-digit display; one user reported “only one failure” across several hundred ER71 replacements. It supports RTD, thermocouple, and analogue inputs, and the disputed IP65 rating applies to the front panel, not the whole housing. [#21879854]

Why it matters: This FAQ clarifies what is actually inside the RE22, which parts drive its display and inputs, and which spec-sheet claims matter during repair, retrofit, or reuse.

Model Role in thread Reported field experience Noted takeaway
RE22 Original controller discussed Brief use mentioned Compact, feature-rich, repairable
ER71 Replacement used in installations Several hundred units, 1 failure Described as cheap and reliable

Key insight: The most important correction is that IP65 applies only to the front panel. The rear terminals and connections are discussed as IP20, which changes how you mount and protect the controller in real installations.

Quick Facts

  • The RE22-121000 supports resistance temperature sensors, thermocouples, and standard analogue signals, and it can run in on/off mode with hysteresis or with PID plus auto-adaptation. [#21879622]
  • Internally, the controller uses four separate PCB boards, an Atmega32 microcontroller, a ULN2003 driver, an LM358, an HCF4051, and a TL431. [#21879622]
  • The power section includes a BREVE TEZ 2.5/D transformer rated about 2.0 VA with 7.5 V on the secondary, followed by a 78M05 regulator. [#21879622]
  • The display uses individual LSD3155-20 digits rather than a dedicated I2C-style display driver, which points to direct multiplexed control from the main logic. [#21879622]
  • A current price of £349 was cited in the thread, while the protection class was clarified as IP65 from the front and IP20 at the contacts. [#21879792]

What inputs does the RE22-121000 temperature controller support, such as RTD sensors, thermocouples, and analogue signals?

It supports resistance temperature sensors, thermocouples, and standard analogue signals. The same post says it can control temperature in simple on/off mode with hysteresis or with PID, and it also offers password protection and relay output control for small loads. That makes it suitable for plastics, food processing, drying, and other temperature-stabilisation tasks. [#21879622]

How is the RE22-121000 built internally, and why does it use four separate PCB boards instead of a single board?

It is built from four separate laminate PCB boards joined with pin headers or direct soldering. That stacked layout lets the controller fit a 4-digit display, four indicator LEDs, three buttons, the power section, and the measurement circuitry into a very small front-panel module. The author presents the multi-board construction as the main reason for its compact design. [#21879622]

What is the 2252A chip in the RE22-121000, and is it likely to be a Texas Instruments TLC2252?

It is likely a TLC2252 from Texas Instruments. A later reply identifies the marking as TLC2252 and adds one practical check: confirm it by tracing the board connections. 1. Read the package code. 2. Follow the pins into the analogue section. 3. Compare the connections with nearby parts such as the LM358 and HCF4051. [#21879846]

Why are there eight transistors inside the RE22-121000, and what parts of the display or front panel do they control?

The eight transistors appear to split control between the display and front-panel indicators. One reply explains them as four lines for the display and four for the panel LEDs, while the original post had already identified four transistors next to the Atmega32 for the individual digits. Together, that matches a small multiplexed front panel with a 4-digit display and 4 indicator lights. [#21879969]

Where does the IP65 rating on the RE22 come from, and does it apply to the whole enclosure or only the front panel?

The IP65 claim comes from the manufacturer specification, but in the thread it is clarified to apply only to the front panel. A follow-up post explicitly states IP20 from the contacts and IP65 from the front, which resolves the concern raised by the visible ventilation slots and unsealed rear connections. For installation, that means the rear still needs enclosure protection. [#21879810]

How should the BREVE TEZ 2.5/D transformer in the RE22 be fused, and what does the fuse marking on the label actually mean?

The transformer should be protected by an external fuse of the value indicated on the label, not by an internal fuse inside the transformer. A reply in the thread states that the BREVE part does not have a built-in fuse and that the symbol on the sticker indicates the required external protection. That interpretation directly answers the earlier dispute about the label marking. [#21879754]

What does IP65 mean on a panel temperature controller, and how is it different from IP20 at the terminals or rear connections?

IP65 here means the front face is protected against dust ingress and water jets, while IP20 at the terminals means the rear contact area has much lower protection. The thread makes that distinction explicit: the controller is specified as IP65 from the front and IP20 from the contacts. In practice, the panel cut-out protects the front, but the wiring side still needs a proper cabinet. [#21879810]

What is auto-adaptation in a PID temperature controller, and how does it help when setting control parameters?

Auto-adaptation is the function that selects PID parameters automatically instead of forcing the user to set them all manually. In this controller, the manufacturer description quoted in the thread says the PID settings can be entered manually or chosen automatically through auto-adaptation. That reduces setup time when the controller is moved between different heaters, sensors, or thermal loads. [#21879622]

How do the Atmega32 and ULN2003 work together in a small four-digit temperature controller display circuit?

The Atmega32 acts as the main controller, and the ULN2003 likely provides the higher-current switching needed for the multiplexed display segments. The post states that four nearby transistors control the individual digits, while the ULN2003 is probably used for the segments. That is a classic small-controller display architecture when no dedicated I2C display driver is present. [#21879622]

Why would an electrolytic capacitor look slightly swollen in a transformer-powered controller that does not use a switching power supply?

A slightly swollen electrolytic capacitor still indicates ageing or stress, even in a transformer-powered design. The author flags that part as unusual because the controller uses a mains transformer, a 7.5 V secondary, and a 78M05 regulator rather than a switching supply. That makes the swelling more noteworthy, not less, because it suggests component wear despite a simpler power section. [#21879622]

How can you identify an unknown IC on a controller PCB by tracing connections and comparing likely parts such as the TLC2252, LM358, and HCF4051?

You identify it by matching its pins to the surrounding circuit, not by package code alone. "HCF4051 is an analogue multiplexer that routes one of several input channels to a shared path, making it useful in mixed-sensor measurement circuits." In this board, the unknown 2252A sits near an LM358, HCF4051, and TL431, so tracing power, inputs, and outputs is the fastest way to confirm whether it is the TLC2252 suggested in the reply. [#21879846]

RE22 vs ER71 temperature regulator: what differences matter most for reliability, features, and replacement in industrial use?

The thread gives reliability data only for the ER71 replacement, not a full feature-by-feature comparison. One installer says they used the RE22 briefly, then replaced it with the ER71, and reports only 1 failure across several hundred installed units. That makes field reliability the clearest differentiator in this discussion, while feature differences are not described in detail. [#21879854]

What is the LSD3155-20 display used in the RE22, and how is it driven without a dedicated I2C-style display driver?

The LSD3155-20 is the individual digit display element used to build the RE22’s 4-digit front readout. The post says the display uses separate LSD3155-20 digits and notes there is no unusual dedicated I2C-style display driver. Instead, the circuit appears to use direct multiplexing from the Atmega32, with transistor switching for digits and a ULN2003 for segment drive. [#21879622]

How would you reuse an RE22-121000 module for a DIY project through its programming port and existing display hardware?

You could reuse it by keeping the existing power, display, and keypad hardware and accessing the programming header on the PCB. The author notes that a programming port is visible and says the unit could likely be brought back to life for a DIY project. The realistic path is to inspect the header, identify the Atmega32 programming interface, and then map the display and button lines. [#21879622]

What real-world reliability and failure rates have users reported for the RE22 controller in industrial installations?

The only concrete field report in the thread is for the ER71 used as a replacement, not for long-term RE22 fleets. One installer says they fitted several hundred ER71 regulators and saw only 1 failure, then describes that model as cheap and reliable. For the RE22 itself, the same user says only that they used it briefly, so no comparable failure rate is given. [#21879854]
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