Strength testing of concrete is carried out using special instruments. As a rule, they consist of sensors, as well as a conductor. Modules for devices are selected with adapters. Models differ in the accuracy of measurements, and the permissible temperature. Many devices use controllers. If we consider electronic meters, then they have a screen. In order to understand this issue in detail, it is recommended that you familiarize yourself with existing methods for measuring concrete strength.
Concrete Strength Testing Methods
First of all, the laboratory method is isolated. It consists in the addition of indicator substances. For this purpose, a sample is taken and then diluted in a reagent. The second method is to press the substance. Strength testing of concrete is done by calculating the pressure. The latter method is called non-destructive testing. For this, special devices are produced.
Mechanical meters
It is possible to check the compressive strength of concrete using mechanical meters. They provide a tube to which a wired sensor is attached. A special contactor departs from it, which closes on the plate. Many modifications work with all brands of concrete. The contacts in the device are highly conductive. A catcher is used to check the compressive strength of concrete. As a rule, data is shown by an arrow.
Electronic meters
Recently, electronic modifications are in great demand. The models use a special unit. It receives data on the parameters of concrete. Using the module, all information is calculated. Many models have the option of entering the initial data. The microcircuits for such meters are of the contact type.
The calculation of concrete is carried out thanks to the operation of the module. There are no catchers in this case. The sensors are used with low conductivity filters. Most devices have a high correlation threshold. The maximum allowable temperature of the meters is 45 degrees. Cases are often made of plastic, and the sensors are made of aluminum alloy.
Low precision devices
Low-precision concrete strength meters are typically used on construction sites. These devices can be produced with a mechanical sensor. Most models are equipped with contact transmitters. If we consider the Beton Pro Condtrol meter, then it gives an error in the region of 0.3%. Moreover, the correlation coefficient is quite high.
The conductivity of this type of meter is not very good. The minimum allowable temperature is about -15 degrees. If we consider the Onyx device, then it is not allowed to use it at high humidity. The auto-calibration option is provided in almost all meters. The minimum level of strength for measurement is 3 N. Concrete can be tested with different grades. Catchers in models are used low sensitivity. If we talk about the benefits, it is also worth noting that the devices are cheap.
High precision models
By checking the strength of concrete, a high-precision device can be very useful. Devices of this type are usually used by professional builders. Also, modifications are actively used in the laboratory. Models have special electrode sensors. They process data on the density and humidity of the sample. It should also be noted that they can work at elevated temperatures. Probes in devices are used channel type. The minimum allowable temperature of the meters is approximately -10 degrees.
Contactors in devices are used with expanders. The control units are used with a microprocessor. If we consider electronic devices, they often install modules. Concrete calculator is calculated using the controller. Cards are used to store data. The accuracy of data processing is quite high. Moreover, the error coefficient of maxim is 0.2%. Catchers are used with transmitters, and without them.
Devices with an electronic unit
Electronic devices are typically sold with a probe. Some modifications are equipped with displays for reading data. Processing modules are highly conductive. Some meters work at high humidity. For laboratories, the models fit perfectly. Their correlation coefficient fluctuates around 55%. It is additionally important to note that there are meters with channel electrodes. Microprocessors for them are selected on operational amplifiers. The concrete calculator is calculated by the device thanks to the controller. Most models work with a transmitter. The minimum allowable density of concrete is 5 N.
Models with Sensor
Concrete strength meters with sensors are appreciated for their compactness. Many models use duct probes. It should also be noted that there are modifications on wire transistors. The transmitters for them are selected multi-channel type. The conductivity coefficient in devices of this type is at least 5 microns. The minimum allowable temperature of the meters starts from -15 degrees. Most devices operate in high humidity.
If we consider electronic modifications, then they use a module with an auto-calibration function. Contacts are selected in different shapes. Also on the market are specialized diode devices with an indication system. Quite often they are used in large construction enterprises. Modules are suitable for them with high conductivity. It should also be noted that catchers are installed on the meters, and devices from lithium batteries work.
Sclerometer devices
Concrete strength meters with a sclerometer are highly accurate. Most models are made with contact sensors. Some devices boast a high conductivity coefficient. In this case, the sensitivity indicator starts from 4.5 mV. The minimum allowable temperature of meters of this type is -10 degrees. Sclerometers are installed with tubes, at the end of which there is a trap. The contactor is mounted on a special holder. Data is usually displayed. For fast data processing, a modulator is installed. Some devices are made with a chip that is capable of storing data.
Devices with data backup function
Models of this type are produced with cards that read information from the control unit. Probes in devices are used in different directions. Microprocessors are typically used with pulse conductors. Contactors are used in various forms. Most devices are powered by a dipole modulator. Speaking of compact devices, they have a short tube. The sensor is used one-way type.
The conductivity coefficient in devices reaches 4.3 microns. In this case, the maximum sensitivity is 9 mV. The minimum allowable temperature of this type of meter is -20 degrees. Transmitters are used with channel conductors. Filters are often set at 4 pF. Catchers are installed quite rarely. Lithium batteries are used to charge models. Most meters support automatic calibration.
Pulse Sclerometer Models
Concrete strength meters of this type have good sensitivity. They are able to carry out automatic calibration. Applied devices for different grades of concrete. The minimum allowable temperature of the meters is -10 degrees. The contacts they use are of positive conductivity. Most modifications are equipped with only one probe. In this case, the transmitters are used on two outputs. Model data processing is time-consuming. Some devices are made with dipole modulators. The main disadvantage of the devices is the low correlation coefficient.
Modifications with a diode sclerometer
Devices with diode sclerometers can quickly measure strength. Moreover, data processing does not take much time. Some devices are made with flat displays, which differ in resolution settings. It should also be noted that there are meters with contact probes.
Concrete diagnostics is carried out using a modulator. Most models can be used with high humidity. The minimum allowable temperature of meters of this type is -10 degrees. The electrodes in this case are installed in the tube. Some models are equipped with dipole catchers. Protection systems for meters are used in class P40.
Professional models
Professional modifications only work on wired modules. Contacts are established with conductivity from 5.5 microns. The devices are well protected, and are not afraid of high humidity. In addition, they have the function of calibration and data archiving. Control units are used with a microcircuit. Some devices are powered by lithium batteries. There are also battery modifications. The measurement accuracy for devices starts from 98%. Probes are used tubular type. Protection systems, as a rule, are used in class P55. Most meters are made with displays.
Compact devices
Compact meters are manufactured with dipole catchers. In this case, the tubes are used of small diameter. Most devices are made without probes. It should also be noted that there are modifications of low conductivity. Their correlation coefficient is only 60%. Microprocessors can operate on filters. The minimum allowable temperature of compact meters is -10 degrees. Batteries are often used in small capacity. The electrodes in the devices are made with a sensitivity of 3 mV. The coefficient of dielectric constant is not more than 30%. Auto calibration is not available on all devices.
Glatec Models
Devices of this brand are distinguished by high-quality probes. Some models are actively used in construction enterprises. The minimum level of strength for measurement is 3 N. The microcircuits in the devices use high conductivity. Calculation of concrete is very fast. The contacts of the models are established with transmitters, and without them.
Sensors are used at 3 and 5. mV. The correlation coefficient, as a rule, is in the region of 60%. The minimum allowable temperature for meters of this brand is at least -10 degrees. Additionally, the company specializes in the production of high conductivity models. The sensitivity parameter is induced at the level of 4.5 mV. Many modifications are made with contactors.