Digital thermometer with remote sensor: circuit and feedback

Digital thermometers are very user-friendly. First of all, it is important to note that they have a low percentage of error. Many models are able to determine the humidity in the room.

Devices with remote sensors are most suitable for laboratory studies. Models differ in sensitivity and type of sensor. In order to ruin this issue, one should consider the standard scheme of a digital thermometer.

Device Diagram

A conventional thermometer includes a multi-channel sensor, as well as a set of resistors. Directly the signal on the display is displayed with a small chip. The condensers are mounted on it. To increase the sensitivity of the device, various types of thyristors are used. The size of the modification depends on the capacitance of the transistors.

How to make a model?

Making a digital thermometer with your own hands is quite simple. The sensor itself needs to be selected with a probe type. Modifications with suckers make it difficult. Also, a thyristor block is required for operation. Next, to make a digital thermometer with your own hands, a compact sensor is taken. The chip is selected by the PP20 series. To increase the sensitivity, various elements are used. In this case, you can use an amplifier. On the market, as a rule, impulse modifications are presented.

They are quite expensive, but they can work a lot. Capacitors are used to perform the calibration process. On average, the cell capacity should not exceed 3.5 pF. To increase the threshold of the permissible temperature, resistors with different conductivity are used. A two-wire cable is required to connect the sensor. With the output contacts of the chip it is connected using a conventional soldering iron.

DC-1 Reviews

This digital thermometer with a remote sensor is very easy to use. First of all, it is important to mention a wide temperature range. If necessary, the device is able to accurately determine the level of moisture. The interface in this case is used by the PC series. A socket for connecting a USB cable is provided by the manufacturer. The accuracy of the thermostat measurement is no more than 1.3%.

The calibration speed of the equipment is quite high. The sensor in the device is applied with a feeler type. For a laboratory study, the model fits well. The protection system is provided by the IP31 series. The standard kit includes a battery sensor and a digital thermometer. The instruction is also attached by the manufacturer. It stands in the market for this model in the area of 540 rubles.

Description of thermometers DC-2

This is a fairly simple and convenient digital thermometer. Its circuit includes field capacitors and a pulsed transistor. For household use, the model fits perfectly. The level of moisture in this case can not be measured. If you believe the buyers, then the equipment turns on quickly enough. Batteries in the standard kit include a small capacity. The through resistance of the presented modification is at the level of 4.5 ohms. The minimum permissible temperature of the sensor is -70 degrees. The interface is simple and straightforward. The function of storing the value in the thermometer is absent. The sensor is used in a probe type.

DC-5 device

This digital remote thermometer has a high threshold temperature. The model is quite expensive, but it has a lot of advantages. First of all, it is important to mention the low percent error. The sensor is of a multi-channel type. The calibration speed is high.

The interface is directly used by the PC series. The protection system in the equipment is installed by IP32. The function of the moisture meter at the device is provided. For field studies, the device is ideal. The through resistance of this modification does not exceed 6 ohms. For sale, the thermometer is offered at a price of 2100 rubles.

Digital Thermometers

It is a compact and convenient digital thermometer. Its circuit includes capacitive capacitors and a sensitive sensor. Many people buy a device for household use. If desired, he is able to show the level of moisture in the apartment. The calibration speed of the model is very low. It is also important to note that the level of error is equal to as much as 2.5%. The through resistance is at 4 ohms. The protection system is used by IP 33. The user can buy a thermometer of the presented brand for only 600 rubles.

Reviews about Digital 320

This digital thermometer with a remote sensor is sold with a fairly high-quality sensor. The sensor itself is installed in a multi-channel type. The average measurement time is 1.2 seconds. As a rule, the error index does not exceed 0.8%. Most often, the model is acquired for laboratory research. However, it is important to note the low threshold temperature limit.

The calibration process in the device takes a long time. If you believe the buyers, then the device starts with a slight delay. In total, the device uses two batteries. Suffices them for about three hours of work. The interface is provided by the manufacturer of the PC series. The connector for the USB port is located on the side panel. Buy this thermometer can be for 1600 rubles.

Description of thermometers Digital 700

The digital thermometer with remote sensor is universal. In the apartment, it will help determine not only the exact temperature, but also the level of humidity. The sensor is directly used by a multichannel type. The sensor is normally provided with a feeler. The gain can not be adjusted in this case. The interface for control is provided for the PC series.

If you believe the customers, then the thermometer turns on very quickly. However, the time for obtaining the result can be prolonged. The sensitivity index of the presented model fluctuates around 4.5 mV. The through resistance of the modification is at the level of 5 ohms. The price of the thermometer is around 1300 rubles.

Digi Sense device

This digital thermometer reviews from buyers basically gets positive. Many owners praise the device for its compactness. If necessary, it is able to determine the exact humidity level in the room. The interface is used as standard in the PC series. If necessary, the user can change the sensitivity parameter. The maximum permissible temperature of the equipment is 200 degrees. In total, the model uses one sensor.

In this case, the resistors are of the impulse type. If you believe the experts, the batteries last about three hours of operation of the equipment. Condensers near the thermometer are of capacitive type. Taking this into account, the equipment has a high temperature measurement accuracy. The error in this case is at the level of 2.1%. Buy a thermometer you can only for 800 rubles.

Thermometers Shenzhen K55

This multifunction digital thermometer with remote sensor is designed for operation in the laboratory. In this case, the sensor is connected via a three-core cable. The equipment is powered by conventional lithium batteries. The battery life is no more than three hours. The chip in this case is of a switched type.

There is a USB connector on the side of the equipment. The function of memorizing results is not provided for in the model. It is also important to note that the model is switched on with a low delay. The through resistance does not exceed 5-4 ohms. A digital thermometer with a sensor is on sale at a price of 800 rubles.

Reviews about Shenzhen K35

Many buyers are positive about this thermometer. In particular, it is praised for its compactness. The batteries are weak, and they last for about an hour of battery life. However, it is important to note that the model is able to determine the humidity level in the room. The interface itself is provided for the PC series. In this case, the values on the screen can be seen clearly.

The transmitter at the thermometer is provided by the manufacturer of a multi-channel type. If necessary, the sensitivity of the device can be adjusted. The end-to-end resistance is equal to no more than 5.5 Ohm. The minimum permissible temperature of the equipment is -60 degrees.

The signal transmission speed of the model is high. In many respects this was achieved through the use of high-quality resistors. The permissible error is not more than 2%. The minimum spread of resistance is at the level of 1%. Condensers in the device are provided in a single-charge type. A digital thermometer with a sensor is on sale at a price of 1200 rubles.