1. Process conditions: mainly refers to the pressure, flow, temperature, severity, viscosity, corrosivity of the measured medium or controlled medium, and the operating conditions such as the measurement range and allowable deviation of the measured parameters. This is the main basis for selecting the instrument, which is related to the rationality of the instrument selection and the service life of the instrument. For example, the size of the measured value determines the range of the selected meter. Generally, the normal measured value is in the range of 1/2-2/3 of the full scale; if the pressure or temperature is too high, the primary component or the meter can withstand it; the viscosity is too large. Block the pipeline; corrosive should consider isolation measures, high requirements for explosion-proof can be pneumatic instruments or explosion-proof electric meters. In addition, instruments of different accuracy levels can be selected depending on the allowable deviation.
2. Installation location and installation method: The installation location and installation method of the instrument also have an impact on the shape of the instrument. Centrally installed instruments often use unit-combined instruments or meters with long-distance signals. Locally installed instruments can use base-type instruments.
3. Unity: In order to facilitate maintenance and management, attention should be paid to the uniformity of instrument types.
4. Economical and practical: Starting from the domestic instrument industry level, taking into account the supply and use of the instrument, under the premise of satisfying the process production, the instrument should be selected for easy management, simple and practical, and suitable price.
The JUK universal Screw Terminal Block series has the typical features which are decisive for practical applications:
l The universal foot allows the terminal blocks to be easily snapped onto the NS35 or NS32 DIN Rail with G shape.
l Closed screw guide holes ensure screwdriver operation perfect.
l For terminal block with different wire cross-sectional areas, complete accessories are available, such as end plates, partition plates, etc.
l Potential distribution achieved by fixed bridges in the terminal center or insertion bridges in the clamping space.
l Same shape and pitch Grounding Terminal Blocks as the JUK universal series.
l Adopt ZB marker strip system,achieve unified identification.
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Wonke Electric CO.,Ltd. , https://www.wkdq-electric.com