CN1715928A

CN1715928A - Remote on-line analytic detector for conductivity, pH value and oxygen dissolving value

Info

Publication number: CN1715928A
Application number: CNA200510079363XA
Authority: CN
Inventors: 郑刚; 何荣仁; 张元刚; 沈江华; 张立安
Original assignee: SHANGHAI DONGFANG MECHANOELECTRIC SCIENCE AND TECHNOLOGY Co
Current assignee: SHANGHAI DONGFANG MECHANOELECTRIC SCIENCE AND TECHNOLOGY Co
Priority date: 2005-02-02
Filing date: 2005-07-08
Publication date: 2006-01-04

Abstract

The remote on-line analysis and detection instrument for conductivity, pH value and oxygen dissolving value includes primary meter electrode probes and secondary instrument. It features the network interface RJ45 for the connection of CPU to upper computer; the CPU connected to RS485 bus via output module with analog quality output of 4-20 mA, display interface as processor digital bus, and the connection between the CPU and CAN bus; the in-situ data acquisition, front end multistage operation amplifiers and A/D converter set inside the electrode probe of the primary meter; and the split primary meter and the secondary instrument. The CPU is embedded ARM chip and thus has less peripheral devices, less signal interference and high reliability. The present invention has rich industrial interface, the flexible configuration of electrode with the secondary instrument, DCS, industrial control computer and other industrial control equipment and system, multimode display of the acquired signal, etc.

Description

The remote on-line analytic detector of a kind of conductivity, pH value, oxygen dissolving value

Technical field

The present invention relates to the remote on-line analytic detector of continuous monitorings such as a kind of conductivity value that is applied to softening water, steam condensate (SC), sea water by distillation, Yuan Shui, power-plant makeup and deionized water etc., pH value, oxygen dissolving value, belong to field of instrumentation technology.

Background technology

The current main means that become the supervision of factory and enterprise water and steam quality of on-line analysis measuring instrument monitoring, and be aided with a spot of manual analysis.After in-line meter comes into operation, the operations staff will make regular check on and safeguard, adjusts the temperature and the flow of steam sample, when instrument video data generation certain amplitude changes, then whether this steam sample of manual analysis has quality to change, and judges that in-line meter does not have to break down.When confirming the in-line meter fault, then in time handle maintenance.The in-line meter electrode is easily scorched by the high temperature water sample, TWS too high (reaching 60 ℃ sometimes), and the instrument temperature compensation difficult, the activity of measured object also has been subjected to influence in the water sample, and online table meter accuracy descends.In addition because the pollution of aqueous solution etc., make that the maintenance to the souvenir electrode more changes jobs very loaded down with trivial details.Because above all factors, make that the application and the maintenance cost of existing in-line meter are higher, and other existing shortcomings such as conventional online measuring instrument such as conductivity meter, PH meter, dissolved oxygen meter also have: adopt resolution element, the instrument volume is big, detection speed is slow, precision is low, and signal is subjected to external interference, can't be connected with modern communication networks etc.

Summary of the invention

The objective of the invention is shortcoming for prior art, a kind of high reliability is provided, and operability, low cost, volume is little, precision is high, detection speed is fast and the remote on-line analytic detector of the conductivity that can be connected with modern communication networks, pH value, oxygen dissolving value.

Technical scheme of the present invention is, the remote on-line analytic detector of a kind of conductivity, pH value, oxygen dissolving value, it comprises once shows electrode probe and secondary table, the signal that is recorded at the scene by electrode probe is converted to the core cpu processing through on-site data gathering, the multistage amplifier of front end, A/D, by the signal after the CPU processing digital quantity output, analog quantity output are arranged, show through display interface to secondary table, it is characterized in that, addition has network interface RJ45 in secondary instrument, and core cpu is handled and is connected with host computer by this interface; Described CPU is connected with the RS485 bus by output module, and described analog quantity is output as 4-20mA, and display interface is the processor number bus, and CPU also directly can be connected with the CAN bus; Described on-site data gathering, the multistage amplifier of front end, A/D conversion portion are to place in the electrode probe of remote on-line analytic detector of conductivity, pH value, oxygen dissolving value; The ARM embedded chip is adopted in described core cpu processing section.

Described in the ARM chip realization and the self diagnosis of network interface, the network interface part is at first by the open bus interface connection universal network chip based on ARM; By software programming, realize the mutual transmission of network UDP message bag then to ARM; The self diagnosis part, the self diagnosis of probe is determined according to field data by built-in processor, table inside then is to finish in the lump by core processor, and whether fault, output module, output interface, network interface be normal can to detect amplifier, A/D chip.

The invention has the beneficial effects as follows, on whole instrument structure, adopt first and second table split-type design, the embedded-type ARM chip that CPU uses, the quantity of comparing peripheral additional device with conventional one-piece machine system greatly reduces, get rid of the signal interference and the individual difference accumulation that too much cause because of resolution element effectively, thereby realized the high stability and the high reliability of metering circuit.On-site data gathering, the multistage amplifier of front end, A/D conversion portion are to place in the electrode probe, the collection and the signal digital conversion that are about to transducing signal are integrated on the electrode, and provide abundant industrial interface, make electrode can be as required carry out configuration and integration with industrial control equipment such as secondary instrument, DCS, industrial control computer and system neatly, realize that simultaneously the multi-channel multi-mode of acquired signal shows.By abundant industrial interface, link to each other with existing RS485 bus, DCS system, while supporting industry CAN bus, bus standard compatibility with existing Siemens and A-B company makes instrument realize that in the bus aspect the seamless of system connects with the industrial products system that is widely adopted at industrial control field.The arrange in pairs or groups professional monitoring software of my company makes cross-region, remote monitoring cheaply and management become a reality.Instrument has increased the network diagnosis control function, and the centralized management/fault that the embeds an interface Network Based pattern of testing oneself is by the direct on-line dispaly control instrument of this pattern.Thereby improved safety of operators greatly, and work efficiency.

Description of drawings

Fig. 1 is a structured flowchart of the present invention,

Fig. 2 is the sonde configuration block diagram.

Embodiment

By shown in Figure 1, the remote on-line analytic detector of a kind of conductivity, pH value, oxygen dissolving value, it comprises once shows electrode probe and secondary table, both do the split design, therefore, data acquisition, the multistage amplifier of front end, A/D conversion are all placed and once show in the electrode probe, the collection and the signal digital conversion of transducing signal is integrated on the electrode.Be equipped with Industrial Ethernet network interface RJ45 in secondary instrument, core cpu is handled and is connected with host computer by this interface; Described CPU handles core and is connected with the RS485 bus by output module, and described analog quantity is output as 4-20mA, and display interface is the processor number bus, and CPU also directly can be connected with the CAN bus.Because abundant industrial interface, as RS485,4-20mA, Industrial Ethernet, industrial bus, make electrode can be as required carry out configuration and integration with industrial control equipment such as secondary instrument, DCS, industrial control computer and system neatly, realize that simultaneously the multi-channel multi-mode of acquired signal shows.

32 ARM7 embedded chips are adopted in the core cpu processing section, and integrated degree height reduces volume and strengthens reliability, has reduced the production maintenance cost.12-16 position chip is adopted in the A/D conversion, and conversion accuracy is improved.Software of the present invention is three parts: the realization of network interface and self diagnosis in the ARM chip.

1, network interface part at first connects universal network chip (8019, CS8900 etc.) by the open bus interface based on ARM7; By software programming, realize the mutual transmission of network UDP message bag then to ARM.

2, self diagnosis part, by shown in Figure 2, the self diagnosis of probe determines according to field data that by built-in processor table inside then is to finish in the lump by core processor, and whether fault, output module, output interface, network interface be normal can to detect amplifier, A/D chip.

3, remote centralized administrative section by the connection of networks such as Industrial Ethernet, industrial bus, can realize that the teledata of probe is checked, remote parameter is revised and carry out remote software update when needed according to the result of self diagnosis.

Claims

1, a kind of conductivity, pH value, the remote on-line analytic detector of oxygen dissolving value, it is by conductivity, pH value, the signal that the detecting sensor of oxygen dissolving value records at the scene is through on-site data gathering, the multistage amplifier of front end, A/D is converted to core cpu and handles, by the signal after the CPU processing digital quantity output is arranged, analog quantity output, show through display interface to secondary table, it is characterized in that, addition has network interface RJ45 in secondary instrument, core cpu is handled output and is connected with the host computer with telemanagement part by this interface, described CPU is connected with the RS485 bus by output module, analog quantity is output as 4-20mA, display interface is the processor number bus, and output module also is connected with the CAN bus.

2, the remote on-line analytic detector of conductivity according to claim 1, pH value, oxygen dissolving value, it is characterized in that described on-site data gathering, the multistage amplifier of front end, A/D conversion portion are to place in the detecting sensor circuit of on-line analysis detector of conductivity, pH value, oxygen dissolving value.

3, the remote on-line analytic detector of conductivity according to claim 1, pH value, oxygen dissolving value is characterized in that, 12-16 position chip is adopted in described A/D conversion, and 32 ARM7 embedded chips are adopted in the core cpu processing section.

4, the remote on-line analytic detector of conductivity according to claim 1, pH value, oxygen dissolving value, it is characterized in that, described in the ARM chip realization and the self diagnosis of network interface, the network interface part is at first by the open bus interface connection universal network chip based on ARM; By software programming, realize the mutual transmission of network UDP message bag then to ARM; The self diagnosis part, the self diagnosis of probe is determined according to field data by built-in processor, table inside then is to finish in the lump by core processor, and whether fault, output module, output interface, network interface be normal can to detect amplifier, A/D chip.

5, the remote on-line analytic detector of conductivity according to claim 1, pH value, oxygen dissolving value is characterized in that, described host computer remote centralized administrative section at first connects the universal network chip by the open bus interface based on ARM; Then by to the software programming of ARM, the mutual transmission that realizes network UDP message bag passes to host computer with the real time data of electrode probe, and parameter setting information, the software update information of host computer passed to electrode probe.