After correct connection(can be viewed in), we move on to setting the temperature and other settings.

Depending on what we need to heat or cool (at a given temperature, the relay will either close or open the contacts), we set one of two modes: cooling or heating. To do this, press and hold the "SET" button for more than two seconds, the display will show "P0", which means that we have entered the program menu. The "+" and "-" buttons navigate through the program menu, but in our case we are at the desired value "P0", so we press the "SET" button again and select the desired mode: "C" is cooling, and "H" heat.

The next setting in the "P1" menu is hysteresis, this is the temperature difference at which the thermostat turns on or off, ( factory setting 2°C). For example, the thermostat is set to turn off at +40°C, when this temperature is reached, the relay will open. And it will turn on only when the temperature drops to the set hysteresis, that is, at + 38 ° C.

The next two menu items are:

• "P2" upper limit for setting the maintained temperature ( factory setting+110°C).
• "P3" lower limit for setting the maintained temperature (factory setting -55°C). When these temperatures are reached, the W1209 thermostat will turn off.

The menu item "P5" is responsible for the delay of the relay on time, it can be set up to 10 minutes. (default setting 0 min).

The last item "P6" allows you to control the overheating protection. OFF – protection is disabled, ON – protection is enabled.

Setting the temperature: press the "SET" button, the indicator will blink, use the "+" and "-" buttons to set the desired temperature.

To reset to factory settings, you must:

• turn off the power
• press and hold the "+" and "-" buttons
• apply power to the thermostat

The LED display will show "888" followed by the current temperature.

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The W1209 thermal relay module is designed to control temperature in the range from -50 to +100 degrees. Equipped with a 3-character LED display, relay on indicator, three control buttons electronic thermostat, a connector for connecting an external temperature sensor, terminals "K0/K1" for connecting the load and "+12V/GND" for powering the thermostat board. The display shows the current measured temperature from the sensor, "LL" - if the sensor is not connected, and "HH" - if the temperature is out of range.

Characteristics of the thermal relay W1209:

Thermistor	NTC (10K 0.5%) waterproof sensor
Temperature Range	-50°C to +110°C
Measurement accuracy
Control accuracy	0.1°C in the range -9.9°C to 99.9°C, or 1.0°C outside this range
Update time	0.5 seconds
Hysteresis (lag)	0.1°C ....... 5°C
Hysteresis accuracy (lag)	0.1°C
Supply voltage	DC 12V
Quiescent current	< 35 мА
Operating current	< 65 мA
Output voltage	DC 12V
Maximum load current	5A/AC 125V, 15A/DC 14V
Permissible humidity	20% to 85% Rh
Length of cable	0.3 meters
Dimensions	48mm*40mm

The LED display shows the following values:

"LLL" - The sensor is not connected
"HHH" - Temperature out of range (less than -50°C or more than 110°C)
"- - -" - Exceeding the limits set in parameter P6

Preparation for work:

1. Connect a 12V DC power supply to the contacts "+12V" (plus 12V) and "GND" (minus 12V)
2. Connect the load to the contacts "K0" and "K1" (connected to the break in the power supply circuit of the controlled device - serial connection)

After applying 12V power to the contacts "+12V" and "GND", the LED display will display the current temperature measured remote sensor temperature

Setting and setting the set temperature:

To set the control temperature, briefly press the "SET" button. then use the "+" and "-" buttons to set the desired temperature. After setting the temperature, press the “SET” button again, or do not press any buttons for 5 seconds.

Programming:

1. To enter the programming mode, press the "SET" button for 5 seconds!
2. Use the "+" and "-" buttons to select the menu parameter code (P0....P6) from the "Temperature controller menu" table
3. To set the parameter, press the “SET” button and use the “+” and “-” buttons to change the parameter value
4. To save the settings, press the “SET” button, or do not press any buttons for 5 seconds.

To reset parameters to factory settings (default settings):

1. Turn off the power
2. Press and hold the "+" and "-" buttons
3. Apply power to the thermostat

The LED display will show "888" followed by the current temperature.

Temperature controllers are a class of equipment designed to regulate and maintain the temperature in a controlled space within specified limits. They can be used in both heating and cooling applications. These are artificial climate installations, heating systems, freezing equipment.

Mechanical thermostat

According to the principle of operation, thermostats are divided into:

1. Mechanical:

• Bimetallic;
• Capillary.

1. Electronic:

• With mechanical temperature setting;
• Programmable.

Brief overview of the module

Temperature controller W1209 is a programmable temperature control relay. The sensor included in the delivery set is operational in the temperature range from -50°C to +110°C. The controller is designed to work with heating and cooling equipment up to 1 kVA.

Temperature controller W1209

Technical characteristics of thermostat w1209:

• Controlled temperature range – -50°C – +110°C;
• Measurement accuracy in the range from 9.9°С to 99.9°С - 0.1°С, over the range - 1°С;
• Control accuracy in the range from 9.9°С to 99.9°С - 0.1°С, over the range - 1 °С;
• Hysteresis setting - from 0.1°С to 30°С;
• Supply voltage - 12V;
• Current consumption - 22-72 mA;
• Overall dimensions - 48x40x14 mm;
• Weight - 20 g;
• Permissible operating temperature – -10°C – +60°C.

Note! Some sellers position this device with the name xh w1209. All devices of this type absolutely identical.

Setting and operation of the thermostat

Installing a programmable thermostat W1209 consists in connecting the device to a stabilized power source, setting up a temperature sensor and a controlled circuit.

Important! The fundamental point is that the device contains only “dry” relay contacts, that is, it switches the circuit and does not provide any power to the line.

How to connect an electric heater

For proper operation of the device, you should know the features of its operation:

• It is possible to delay switching on from 0 to 10 minutes;
• The circuit has an adjustable hysteresis. Hysteresis is the temperature difference between turning on and off. This function important for switching heating or cooling devices with high inertia.

Further setting consists in selecting the required parameters using the control buttons and the LED digital indicator.

On the considered w1209 thermostat, the instruction does not give detailed description circuitry, but enthusiasts compiled a fundamental circuit diagram w1209 with a 12 V dc power supply, from which it is clear that the work is controlled by a programmable microcontroller, included according to the standard scheme.

Setting procedure

Read the instruction manual before switching on.

To control settings schemeW1209 provides three buttons:

• "set";

All provided functions and capabilities are configured by pressing the listed buttons.

According to the instructions for W1209, to change the settings, you must enter the programming mode. To do this, press and hold the “Set” button for 5 seconds. When the setting item number appears on the screen, the button can be released. To move through the settings menu, use the "+" and "-" buttons.

Whole thermostat instructionW1209 provides from 6 to 8 positions, depending on current firmware embedded microcontroller:

• P0 - switching control of heating or cooling;
• P1 - adjustment of the hysteresis range;
• P2 - change in the maximum temperature control limit;
• P3 - change in the minimum temperature control limit;
• Р4 – correction of temperature measurement error;
• P5 - programming the turn-on delay time;
• P6 - alarm (not used in most firmware);
• P7 - forced shutdown when the upper control threshold is reached;
• P8 - reset to factory settings (does not work on all firmware).

By default, when entering the programming mode, the first menu item is set to P0.

Location of terminals and controls

Having entered the desired item, use the "+" or "-" buttons to set the required parameter value. To exit the programming mode, press and hold the Set button for 5 seconds. Exit to the mode of operation with the recording of settings also occurs after 10 seconds, if no button has been pressed during this time.

The instruction for the w1209 dc 12 v thermal relay informs that this device has a malfunction alarm, which is displayed on the indicator:

• LLL - open temperature sensor;
• 110 or HHH - short circuit of the sensor loop;
• 888 - sensor malfunction.

In addition to using the programming mode, a factory reset can be performed as follows:

1. Remove power from the regulator;
2. Press the "+" and "-" buttons simultaneously;
3. Turn on the power.

Thermal relay calibration W1209

Calibration of the thermal relay is carried out in the programming mode in the menu item P4. For calibration, you need to have an exemplary thermometer. Comparing the readings of the standard with the readings of the structure, they lead to the same values ​​by manipulating the "+" or "-" buttons. After exiting the settings, W1209 automatically corrects the measurement temperature in the entire range.

In the absence of a thermometer, you can use the known values:

• Snow melting temperature - 0°С;
• The boiling point of water is 100°C.

Important! To reduce the error during the calibration process, it is required to use distilled water.

For domestic use, the error will be within acceptable limits when calibrated with boiled water instead of distilled water.

Do-it-yourself modernization of the W1209 thermostat module

The design of the device provides ample opportunities for modernization. You can modify the device as follows:

• Place the thermostat in the housing;
• Extend the temperature sensor cable;
• Change firmware version.

The last point can be performed if you have the skills to work with programmable controllers. For this purpose, the ST-Link V2 USB programmer is used. The required firmware version can be downloaded from the official website of the controller manufacturer. Redesigning the device by changing the firmware to a newer one allows you to introduce new functions and improve performance.

Hull variant

Improvement of the loop makes sense due to the short length of the standard sensor wire (about 0.5 m).

Setting the temperature corrector

The thermostat temperature corrector is set during instrument calibration. The essence of the corrector is to change the measured values ​​in accordance with the actual temperature indicators.

Video

Thermostat W1209 is a electronic device, whose main task is to control the temperature and keep it at certain values. Similar relays are used in devices for maintaining a constant temperature: incubators, heated floors, greenhouses and greenhouses.

The w1209 programmable thermostat has such an important quality as low cost, at present this is the most cheap device from those on the market. The price of this device is in the range of 150-300 rubles.

Brief overview of the module

Digital two-threshold and two-mode - frameless thermostat W1209. The overall dimensions of this device are 4.8x4x1.4 cm. This is a small board with a shorting connector, a terminal block, programming buttons, a display and an on indicator. The main advantages of this device are:

• compactness - the device has a small size;
• versatility - this thermostat can be used in various conditions, it is tolerant of low and high temperatures, has a fairly wide range of settings;
• the presence of a temperature sensor installed on the connector, which is quite convenient in some cases;
• the device is calibrated, this makes it possible to use it with a fairly accurate determination of the parameters.

The basis of the W1209 is the STM8S003F3P6 controller, whose task is to analyze the temperature measured by the temperature sensor, compare it with threshold values, settings. If there is a discrepancy, the controller turns on the load on the current consumer, which brings the temperature range to the programmed values.

Specifications for such an inexpensive device are also impressive:

• temperature control range: -50°C …110°C;
• measurement accuracy: 0.1°C (excluding temperatures below 10 and above 100°C, in this range only whole numbers);
• control accuracy 0.1°C (excluding temperatures below 10 and above 100°C, in this range only whole numbers);
• hysteresis 0.1…15°C, its accuracy – 0.1°C;
• power supply 12V, load current 5A at 220V and 15A at 14V direct current;
• temperature sensor type NTC 10K 0.5%, cable length - 0.3 m;
• power consumption - 65 mA;
• load connection via a single-channel relay.

Additionally, it should be noted that the temperature sensor has a degree of water protection and can operate at relative humidity up to 85%. The set temperature is shown on a three-digit LED display. The w1209 dc 12 V is powered from a 12-14V DC network, with a power of 15A.

Users note a fairly high quality of manufacture and soldering of these devices, at the same time, the short wire of the temperature sensor, only 30 cm, causes criticism.

Important! The thermostatic sensor is protected from moisture, the thermal relay board itself does not have a case, for this reason, installing it in places with high humidity will lead to its failure.

Setting and operation of the thermostat

The thermostat is set using the three buttons below the display. These are the keys: "SET", "+" and "-". "SET" is responsible for selecting the control setting mode, plus and minus are responsible for increasing or decreasing the values ​​of the adjustable parameters. In this case, one of the two main operating modes is configured: this is either heating or cooling the temperature sensor.

When the temperature is within the limits programmed in the device menu, the relay is switched off, switching on occurs when it decreases or increases below the programmed hysteresis. At this moment, the relay turns on and remains in this state until the temperature changes to the level set in the device settings.

When operating in heating mode, the sensor reacts to a decrease in temperature. The microcontroller notes a decrease in temperature on the sensor, below a certain parameter, opens the relay contact and applies a load to the signaling device. If it, in turn, is connected to a heating element, the temperature at the sensor rises. The controller, when analyzing information from the sensor, marks this parameter and its coincidence with the specified one. Then it turns off the signaling device, reducing the load. The same process but in reverse is used in cooling mode.

The controller receives information from the sensor, the connector for it is located on the main board of the device. The temperature sensor itself with a sealed waterproof housing NTC 10K with a resistance of 10 kOhm is connected by a wire through a connector on the board. The disadvantage is only a small cable length - only 30 cm, but if necessary, the wire can be replaced with a longer one. The device diagram is shown below.

Important! The parameter setting is saved even with a short press on the SET key, so you need to be extremely careful when working with the thermostat control.

Setting procedure

The setting is carried out using the control keys. So, when pressing the “SET” button at once, the indicator starts flashing, the display shows the current settings of the module. At this point, you can change the values ​​by operating the plus and minus keys. If there is no action on the control buttons, the sensor returns to the operating mode, it should be noted that the changes made before the menu was turned off are stored in the memory of the W1209 relay chip.

A long press on "SET" will start the programming mode and set the parameters. The instruction offers a detailed description of all operating modes of the device, as well as the main values ​​​​for which the device is designed, but we will duplicate the information here. The parameter menu appears on the display:

• P0 - the main modes of the thermal relay: heating or cooling, letters C and H, cooling is set by default;
• P1 - hysteresis change: from 0.1 to 15, default 2;
• P2 – limiting positive temperature, by default 110 ºС;
• P3 - limiting negative temperature, -50 ºС;
• P4 - correction: -7.0 and 7.0ºС, precise calibration of the temperature range;
• P5 – thermostat on and off time delay, up to 10 min., default 0;
• P6 – shutdown limit temperature, protection against overheating of the device, disabled by default – OFF.

All information is stored in the board controller, and the settings are saved even when the thermostat is briefly disconnected from the power source.

Resetting to factory settings is carried out by simultaneously pressing the SET, plus and minus keys for some time.

Thermal relay calibration W1209

It can be produced from two well-known points: the melting temperature of ice - 0ºС and the boiling point of water - 100ºС. It is worth noting that the last parameter is not constant and depends on the air pressure and its rarefaction; this method will not work in the highlands.

Calibration, verification of the W1209, setting it up at home are quite simple. The sensor is lowered into a container with melting ice or snow, the setting mode is activated on the thermostat. Next, set up menu P4, after which you need to repeat the steps on the second checkpoint at 100 degrees Celsius. In this case, you can be sure that the sensor shows a relatively accurate temperature.

Refinement of the thermostat W1209

Due to the compactness on the main board of the thermostat, the RESET input, the fourth terminal of the controller, is brought to the contacts for programming. This leads to the fact that from time to time the spark knocks down the set values ​​\u200b\u200bof the controller settings. This disadvantage is eliminated by mounting a 0.1 uF SMD capacitor on a common cable.

Despite the relatively low price, the XH-W1209 thermostat is an efficient and compact device for automatic temperature control. Due to the technical and operational characteristics, it can be used for various kinds of technical devices, and directly to control the temperature in mini-saunas and baths.

Video

From this article you will learn what the W1209 device is, how it works, how to connect it.

Shipped from China in 2-8 weeks. Free delivery. Item will be shipped within 1 business day after payment is received. Included with the product will be only a board, a bag, a microcircuit and a sensor.

The thermostat is small. If you compare it with a matchbox, it will look even smaller.

The most noticeable detail of the product is a digital display that shows the temperature down to one tenth of a degree. There are also three buttons and slots for connecting special wires.

W1209 connects very simply. Even regular user, who has no idea about electricity and the principles of its work, will be able to do it on his own and without any effort. To connect Digital Thermometer, you need to find a special socket under the right screw, to the right of the display.

Temperature controller W1209 ideal for temperature control of a homemade incubator. You can buy it for only 145 rubles on the Bangud website by clicking on this link .

Wiring diagram W1209

W1209 operates on DC - 12 volts. Below is a diagram for connecting the W1209. There are four slots on the central unit. The left two slots are for connecting heating elements, the right two are for connecting power.

According to the diagram, the thermostat can be powered from a 220 volt network. However next element in this circuit there must be a special transformer that could convert 220 volts to 12 volts DC.

To the left of the gray block is located heating element(with two characters), which can be connected directly to the W1209. The contact opens in the thermostat and the heater turns off.

Work W1209 on the example of connecting to an incubator

The connection diagram of the thermostat here is almost the same as described above, only the heating elements are added more: a cooling fan, a 12 volt adapter, a fan, a heating element - incandescent bulbs.

The figure below shows the diagram by which the incubator is connected. The wires of all electrical appliances are connected to the W1209 thermostat. Let's start with AC input.

On the right side, you can see the block for connecting the thermostat to a 220-volt DC network. However, it is not connected directly, but through a 12-volt adapter that converts 220 to 12 volts. This adapter is connected to two right slots - "minus" and "plus".

In addition, a 12 volt fan is connected to the same wires. Incandescent lamps are connected to the two left slots. Please note that the light bulbs are connected to the network directly without transformers.

The thermostat itself provides a mode in which, in the event of an increase normal temperature, the circuit opens automatically and the lights go out. The lamps themselves are connected in parallel so that more powerful incandescent bulbs can be screwed in and also they could only work at half their power.

The W1209 temperature sensor is not made in the best way, because the length of its wires does not exceed 50 centimeters. In most cases, this is not enough for the correct installation of the device in order to correctly measure the temperature.

Since the display only shows us the current temperature value, the user will want to set the desired value for him. How to do it? As mentioned above, there are three more buttons on the thermostat: “set”, “plus” and “minus”.

Thanks to these buttons, you can set the desired temperature parameters. This is done as follows - first you need to press the "set" button, then use the "minus" and "plus" buttons to set the required temperature at which the relay will turn on. Actually, the sensor will monitor these indicators.

If the temperature is below the set value, then the contacts of the power terminals will close. The thermostat must be paired with a heater or cooler. If you hold down the "set" button for five or more seconds, then the W1209 will enter the settings mode. The following settings are available:

P0 - choice of heater or cooler
P1 - hysteresis 0.1-15 °C, default 2 °C
P2 - setting the upper operating temperature limit by default 110 ° C
P3 - setting the lower operating temperature limit by default -50 ° C
P4 - temperature correction -7 +7 ° C, default 0
P5 - relay on / off delay 0-10 sec, default 0
P6 - alarm overtemperature 0 +110 °C, off by default

Where P is the program, H is the heater (from the English heat, hot) and C is the cooler (cool). Mode P1 is a hysteresis that keeps the temperature fluctuation within certain limits. It is set in the settings.

Unfortunately, you cannot make all equipment work exclusively from a 12 volt adapter, because this voltage will not be enough to turn on incandescent lamps.

Another option for connecting the thermostat is the ability to connect it not to a constant voltage network (220 volts), but to a 12 volt power source, for example, it can be a car battery.

The figure below shows the connection diagram battery to the thermostat. To the left of the w1209 is a heating element that runs on 12 volts.

Outcome

The W1209 thermostat is an excellent product for temperature control applications such as homemade device like an incubator. It perfectly maintains the optimum temperature.

In case of failure during a sudden power surge, it can be replaced with an analog. In addition, it costs 140-150 rubles. W1209 - very easy to use, even the most novice user without much knowledge of how it works electrical circuit be able to plug it in and use it effectively.

Thermostat W1209 - video on how to use this device