Flow integrator

Abstract

The invention discloses a flow integrator which comprises a main control module, a pulse signal acquisition module, a temperature sensor module, a pressure sensor module, a clock circuit, a data storage circuit, a liquid crystal display module, a remote data transmission module and a data acquisition self-diagnosis module, wherein the temperature sensor module comprises a temperature detection unit and a signal amplification unit; the pressure sensor module comprises a three-terminal adjustable constant flow source, a bridge balance absolute pressure sensor and a differential amplification circuit; the remote data transmission module comprises a 485 communication unit, a CAN (controller area network) bus interface unit and a 4-20 mA signal unit; functions of temperature and pressure compensation, remote data transmission, power failure memory and fault data self-diagnosis are added; the accurate flow measurement is ensured; and the reliability, authority and reliability of the data are improved.

Description

technical field [0001] The invention is applied in the fields of trade settlement and cost accounting, supervision and inspection of energy efficiency and the like, especially a flow accumulating device. Background technique [0002] Energy measurement is usually composed of a primary differential pressure detection element, a transmitter, and a flow totalizer; the flow totalizer is responsible for collecting the flow, temperature and pressure signals of the transmission unit, performing compensation calculations on a single flow signal, and passing the calculation results through 485 communication method to transmit to the upper computer terminal, and then collect and transmit to the collection computer through relevant modules for unified management. [0003] 1. The flow totalizer lacks temperature and pressure fault self-diagnosis and temperature and pressure remote transmission functions. [0004] The flow totalizer calculates the flow through the flow calculation formu...

AI Technical Summary

Problems solved by technology

There are imperfections in the current flow totalizer, especially when the temperature and pressure signals are abnormal, the error information has a great influence on the flow measurement results, and it is easy to cause large measurement errors. Distortion of measurement data

[0005] On-site data acquisition adopts serial transmission and only transmits flow signals, and it is impossible to monitor the temperature and pressure changes of each flow point in the computer acquisition system

[0006] 2. The flow totalizer has the defect of no memory when power off

[0007] The flow totalizer cannot record the power-off time, which can promote the occurrence of cheating behavior. There are usually two situations: one is to power off the flow totalizer, so that even if the primary differential pressure detection element and transmitter work normally, regardless of the actual The amount of energy consumption is reflected in the flow totalizer, and the measurement result during the power outage period is zero; another situation is that although the flow totalizer is not powered off, the flow signal line from the transmitter is transferred from Remove the flow totalizer from the flow totalizer, and the flow totalizer cannot detect the flow meter (we call it "zero signal"), and the measurement result during this period is also zero

Both of these situations can cause inaccurate flow metering data, which will greatly interfere with cost accounting

[0008] 3. The totalizer lacks the self-diagnosis function of collecting faults

When the flow totalizer is connected to the collection system, whether the communication is normal must be checked from the collection terminal, but the on-site collection terminal and the flow totalizer are often far away, which brings great inconvenience to the maintenance work

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