Jan 31 2015

Remote meter base table technology specific requirements

Base table length, connecting ends of threaded or flanged, pressure loss and flow rate technical parameters should comply with the relevant provisions of the national standard GB/T778-1996 in the water meter, and at least b-class accuracy grade. Base tables should have the manufacturer’s name or trademark and the product name, model.

Sensor specifications:
Sensors in intelligent remote water meter system is the most critical part of is the key part of this selection and use.
(1) sensor signal conversion methods can be divided into: 1, real time conversion type: electromechanical conversion unit of the sensor turns the signal in continuous motion in General continues to produce electrical signal components. 2, direct-reading: these sensors are electromechanical conversion unit in telemeter recording directly from a base table only if the mechanical indication device reads the cumulative traffic signals.
(2) the sensor shall be ≥ 7 years service life.
(3) the selection and use, direct-reading sensor should be preferred.
(4) the sensor should be better protected against electromagnetic fields, radiation, water hammer, such as outside interference. Electrostatic discharge, electrostatic field, radiofrequency electromagnetic radiation, electrical fast transient/burst, surge (impact) under electromagnetic disturbance, such as, the sensor should not be damaged, data processing and storage of the sensor should not be lost memory data.

(5) in dry and hot, cold, hot and humid weather conditions, the sensor should not be damaged, data processing and storage, memory data that should not be lost, and be able to work properly. In addition, there should be rain-proof, protected against sunburn.
(6) the sensor signal leads should be reserved for 1 metre long sets of stainless steel hose protection and external line should be in the junction boxes and special crimp terminals.