(1) Due to the internal addition of A/D conversion of the pre-amplifier and post-stage microprocessor, temperature sensitive components and other more than 60 electronic components and 350 solder joints, much more than the internal only 11 electronic components and 30 solder joints analog load cell. The average trouble-free time of the load cell is inversely proportional to the number of electronic components and solder joints it contains, so the stability and reliability must be reduced.
(2) The internal electronic components determine the small operating temperature range, generally a 10400C. If you need to work in an environment below 10 ° C, the low temperature components should be selected, and their costs will be several times or even 10 times higher;
(3) After the digital circuit is placed inside the weighing sensor, in addition to conventional detection and calibration, electrostatic discharge immunity, radiofrequency electromagnetic field radiation immunity and electrical fast transient pulse group immunity tests should be carried out according to the requirements of the weighing instrument;
(4) The digital intelligent circuit is placed inside the weighing sensor, reducing the explosion-proof level, if the explosion-proof requirements are met, more expensive explosion-proof and flameproof measures must be used;
(5) The manufacturing and maintenance costs are high, whether the resistance strain gauge bridge circuit part or the digital intelligent circuit part of the fault, it is necessary to replace a new digital intelligent weighing sensor.
