XP05 sentence Vibrating frequency (temperature) instrument is following the XP99, XP02 punishment Vibrating frequency instrument developed after yet another practical civil engineering test equipment. Its characteristics is based on monitoring of reinforced concrete construction needs, both vibrating wire sensors for measuring force, load cells, strain measurement, but also digital temperature sensors for temperature measurement, and both from theory to practice can at to achieve high accuracy.
Is worth - mentioning is that most of the past, civil copper resistance, thermal resistance as a temperature sensor, since they are resistive, and therefore the existence of non-compliance, non-linear and lead resistance effects. For lack of better technology and did not prepare the sensor units or user, is difficult to guarantee selection, calibration and application accuracy.
Introduced in the XP05, the adaptation is the United States in recent years, the company introduced DALLAS new single-bus digital temperature sensor DSl8B20, it represents the future, temperature measurement devices and temperature measurement at room temperature trends. The temperature range of -55 ~ 125 , a resolution of 0.0625 , at -10 ~ 85 , within an accuracy of ± 0.5 . It has many unique advantages, here is one that we saw in this, namely: it is to send Hill to the digital signal rather than analog signals. Read the signal as long as it is within the scope of its error of the temperature signal, will not be for reasons such as the formation of lead resistance errors. Therefore, in recognition accuracy within ± 0.5 , the device does not require screening and calibration can be used, so that would give factories and users will be packaging it for wiring work of great practical convenience. Of course, if the conditions of its screening, will be a higher accuracy.
For XP05-type vibrating wire frequency instrument to promote the application of its temperature, we also can provide DSl8B20 been packaged as a core temperature sensor or its packaging technologies.
XP05 sentence Vibrating frequency (temperature) instrument did not account for motivation and applications mainly in the following two aspects:
to improve vibrating wire sensors measuring precision vibrating wire sensors, the string tension stress suffered δ is the natural frequency of vibrating single-valued function f can be characterized as: δ = K F
When the sensor is applied to the temperature changes there is a greater occasion, the style should be: δ = K F b TB
Where: k a calibration factor
F 1 frequency modulus variation, namely, fn-fo
b a correction factor Warming
T a temperature variation, that is, Tn-To
B-constant calculation of the amendment
Therefore, the only increase in a heart-line, it will be DSl8B20 into vibrating wire sensors inside, just XP05 right vibrating frequency f and the ambient temperature T at the same time measurements, substituting into the previous fixes and to improve the accuracy.
In mass concrete construction: monitoring of mass concrete foundation and large-scale construction process of reinforced concrete structures, the need to simultaneously track the stress-strain and temperature monitoring, this time, vibrating wire sensors and temperature sensors in the structure can form co-2 one, can be divided into separate cloth body points.
In the concrete pouring process, according to temperature and stress monitoring results, determine the rate of continuous casting, layered pouring time interval.
In the concrete curing process, the control due to hydration heat of concrete caused by internal and surface temperature and the temperature difference between surface and popularity does not exceed 25 , in order to avoid swelling and shrinkage of concrete volume changes cause stress cracks.
Observation of external factors such as sunlight thermal stress generated by the uneven Buzhi Yu more than the safe limits of concrete structural components.
XP05 sentence Vibrating frequency instrument and give full play of the single-chip microcomputer technology, tightly integrated software and hardware technology, which introduces the frequency measurement precision of measurement, etc., in the temperature measurement method which introduces redundancy check, thus ensuring the test results accuracy.