KJT-Non-contact online infrared thermometer
- Material：Stainless Steel
- Working power ：24 VDC
- protection level：IP65
- Max current：50mA
Infrared temperature sensors can calculate the surface temperature of an object by measuring the intensity of infrared radiation emitted by the target without touching the target. Non-contact temperature measurement is the biggest advantage of infrared thermometers, allowing users to conveniently measure inaccessible or moving targets.
The KJT_DXEW series temperature sensor is an integrated infrared temperature sensor. The sensor, optical system and electronic circuit are integrated in the stainless steel shell; the KJT-DXEW series is easy to install, and the standard threads on the metal shell can be quickly connected to the installation site: At the same time, KJT -DXEW series also has various options (such as purge, mounting bracket, adjustable mounting bracket, purge protective cover, etc.) to meet the requirements of various working conditions.
| protection level | IP65(NEMA-4) |
| ambient temperature | 0-60℃ |
| storage temperature | -20-80℃ |
| Relative humidity | 10-95%(no condensation) |
| Material | Stainless Steel |
| cable length | 1.5M (standard) other special specifications (customized) |
| Operating Voltage | 24VDC |
| Maximum current | 50mA |
| output signal | 4-20mA |
| Spectral range | 8-14μm |
| temperature range | 0-100℃ |
| Optical resolution | 20 |
| Response time | 150ms（95%） |
| Temperature measurement accuracy | ±1% of measured value or ±1.5℃ |
| Repeat accuracy | ±0.5% of measured value or ±1℃ |
| size | 113MMxφ18MM(length*diameter) |
| Emissivity | 0.95 fixed |
Light path diagram
Working principle and precautions
a. Principle of infrared temperature measurement
Any object radiates infrared energy outwards, and the intensity of the radiation changes with changes in temperature. Infrared thermometers generally use infrared radiation energy with a wavelength in the range of 0.8μm-18μm.
Infrared temperature sensor is an optoelectronic sensor that receives infrared radiation and converts it into an electrical signal. It displays or outputs temperature through electronic circuit amplifier, linearization, and signal processing.
b. The maximum distance and size of the measured point.
The size of the measured target and the optical characteristics of the infrared thermometer determine the maximum distance between the measured target and the measuring head. In order to avoid measurement errors, the measured target should fill the field of view of the detector as much as possible. Therefore, the measured point should always be kept smaller than the measured object or at least the same size as the measured target.
c. ambient temperature
KJT-DXEW series infrared temperature sensors can work in the ambient temperature range of 0-60℃. Otherwise, please use a cooling jacket.
d. Lens cleaning
The lens of the instrument must be kept clean to avoid measurement errors or even damage to the lens caused by dust, smoke and other contaminants. If there is dust on the lens, wipe it with lens cleaning paper dipped in absolute alcohol.
e. Electromagnetic interference
In order to prevent electromagnetic interference, please ensure the following
measure:
Please try to keep the infrared temperature sensor away from electromagnetic field sources (such as motors, motors, high-power cables, etc.) during installation. If necessary, add a metal sleeve.
冷却保护套尺寸：
The KJT-DXEW series metal shell has M18×1 thread, which can be used for direct installation or installation by using a mounting bracket. The adjustable mounting bracket can make the adjustment of the measuring head more convenient.
When adjusting the measured target and the measuring head, you must ensure that the light path is unobstructed.
| Type | line color | Function |
| Output 4～20mA | Red | ＋24V |
| Blue | Signal output 4-20mA+ | |
| output 0～5V | Red | ＋24V |
| Black | 0V | |
| Yellow | Signal output＋ | |
| Green | Signal output－ |
For 4~20mA analog signal output. It is a two-wire loop current output mode. Its connection with the display or controller has the following two typical applications (connection methods):
