CN2793729Y

CN2793729Y - Long-range on-line analyzing inspector for electric conductivity, pH value and oxygen dissolving value

Info

Publication number: CN2793729Y
Application number: CN 200520111810
Authority: CN
Inventors: 郑刚; 项元培; 沈江华; 张元刚; 丁玉柱; 朱惠鑫
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: 2006-07-05
Anticipated expiration: 2015-07-08

Abstract

The utility model discloses a long-range on-line analyzing detector for electric conductivity, PH value and oxygen dissolving value, which comprises an electric pole probe head of a primary meter and a secondary meter. The utility model is characterized in that a network interface RJ45 is arranged, and a CPU is connected with an upper computer through the interface, wherein the CPU is connected with an RS485 bus through an output module, and the output of analog quantity is 4-20mA; a display interface is a data bus of a processor, and the CPU is also directly connected with a CAN bus. An on-site data collecting part, a front end multiple-stage operational amplification part and an A/D conversion fraction are arranged inside the electric pole probe of the primary meter, and the meter uses a primary and a secondary meter split bodies in structure. The CPU is inlaid with chips by an ARM so as to reduce peripheral auxiliary devices, reduce signal disturbance and enhance reliability. The utility model has abundance of industrial interfaces, ensures that electric poles can be smartly assembled and conformed with industrial control instruments and systems, such as, the secondary meter, a DCS, an industrial control computer, etc., and meantime, realizes the multi-channel and multi-mode display of collected signals so as to ensure that meters are in a seamless joint state with the systems of widely used industrial products on a bus in the field of industrial control.

Description

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

Technical field

The utility model 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, belongs 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 purpose of this utility model is the 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.

The technical solution of the utility model 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, described analog quantity is output as 4-20mA, display interface is a processor data 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.

The beneficial effects of the utility model are, 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.

Description of drawings

Fig. 1 is the utility model structural representation,

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 a processor data 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 utility model 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 host computer by this interface, described CPU is connected with the RS485 bus by output module, analog quantity is output as 4-20mA, display interface is a processor data 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.