CN205246593U - Can mark gaseous detection device that can dispose electrochemical sensor in batches in advance - Google Patents

Abstract

The utility model discloses a can mark gaseous detection device that can dispose electrochemical sensor in batches in advance, it includes the gaseous module that detects of electrochemistry, the gaseous module that detects of this electrochemistry includes: carry out the power module that supplies power to the gaseous module that detects of electrochemistry, memory cell, it connects the module in MCU through the I2C bus, the front end is taked care of to electrochemistry able to programme, and it connects the module in MCU through the I2C bus, meet the electrochemical sensor who takes care of the front end in electrochemistry able to programme, connect the reference voltage source of taking care of the front end in electrochemistry able to programme. Because probably the component of throw off is integrated arrives among the sensor detection module to the error data storage who produces each device when maring arrives the memory cell of module, makes the module have very good precision. It is that the sensor simulation board can be applicable to different kinds of sensors to use electrochemistry analog front end able to programme, needn't plant gas production analog front end circuit board for each, only need the simple configuration of computer just can match different sensors.

Description

Can demarcate in advance in batches the gas-detecting device of configurable electrochemical sensor

Technical field

The utility model relates to poisonous harmful gas detecting device, especially relates to a kind of gas-detecting device that can demarcate in advance in batches configurable electrochemical sensor.

Background technology

Its simplest a kind of pattern of the sensor of electrochemical principle work is exactly two electrode systems. Its working electrode and electrode is separated by skim electrolyte and via a very little resistance UNICOM external circuit. When gas diffuses into after sensor, be oxidized or reduction reaction generation current by external circuit two electrodes of flowing through on sensitive electrode surface. The size of this electric current and the concentration of gas, can be measured by the load resistance of external circuit.

Sensor, after using one section time, due to device aging individually of sensor, can make the precision that gas detects reduce, and produce drift zero point, therefore gas detecting instrument just needs rezeroing and demarcation after in the time of one section of use. Conventionally about 1-2 of life-span of electrochemical gas sensor, in the time more finishing changing sensor head, also needs again demarcate and return to zero.

The LMP91000 of American TI Company is a programmable analog front end, is applicable to micro-power consumption electrochemical sensing application. It can provide the solution of the complete signal path between sensor and microcontroller, and this scheme can generate output voltage proportional to battery current. The programmability of LMP91000 makes it support multiple electrochemical sensor by a single design relative with multiple discrete solutions, for example, and 3 line toxic gas sensor processed and 3 lines galvanic cell type sensor processed.

Traditional gas detecting instrument needs to demarcate in dispatching from the factory, sensor directly need to be received to on-line proving on gas detecting instrument, and directly data are saved in gas abridged armilla after demarcating well, such shortcoming is that the interchangeability of sensor is poor, must again demarcate if change new sensor, and platform to separate marked ratio more consuming time and relatively waste calibrating gas.

Electrochemical gas sensor is of a great variety, the analog front circuit of each gas sensor all needs to mate, traditional electrochemical sensor analog front circuit is all to know in advance that used sensor gas type, range, model etc. just can, according to concrete parameter production circuit, greatly reduce the versatility flexibility of electrochemical sensor analog circuit like this. Must again change circuit if changed sensor, and electrochemical sensor storage life is shorter, is also not suitable for producing in advance abundant product.

Utility model content

The purpose of this utility model is exactly in order to address the above problem, and a kind of gas-detecting device that can demarcate in advance in batches configurable electrochemical sensor is provided, and it solves gas detecting instrument in enormous quantities and demarcates, and for different electrochemical sensor Circuit Matching problems. In the time that needs are changed sensor type, do not need to change hardware circuit, only need to configuration parameter corresponding sensor be written in sensor assembly by computer.

When client needs more when emat sensor, can to demarcate in advance in factory in advance, scene can directly be installed and used and do not affected precision and the degree of accuracy.

To achieve these goals, the utility model adopts following technical scheme:

Can demarcate in advance in batches the gas-detecting device of configurable electrochemical sensor, it comprises that electrochemical gas detects module, and this electrochemical gas detects module and comprises:

Electrochemical gas is detected to the supply module that module is powered;

Memory cell, it is connected to MCU module by I2C bus;

Electrochemistry conditioning front end able to programme, it is connected to MCU module by I2C bus, and this MCU module is connected to computer by RS485 bus;

Be connected to the electrochemical sensor of electrochemistry conditioning front end able to programme;

Be connected to the reference voltage source of electrochemistry conditioning front end able to programme.

It is overall gas module that described electrochemical gas detects module.

The utlity model has following beneficial effect:

Be integrated in sensor detection module owing to may producing the element of error, and the error information of each device generation be saved in to the memory cell of module in demarcating, make module there is extraordinary precision.

Using programmable Electrochemical Simulation front end, is that Sensor Analog Relay System plate goes for dissimilar sensor, needn't be each gas generation analog front circuit plate, only needs the simple configuration of computer just can mate different sensors.

Brief description of the drawings

Fig. 1 is the gas-detecting device schematic diagram that can demarcate in advance in batches configurable electrochemical sensor.

Detailed description of the invention

For technological means, creation characteristic that the utility model is realized, reach object and effect is easy to understand, below in conjunction with specific embodiment, further set forth the utility model.

As shown in Figure 1, can demarcate in advance in batches the gas-detecting device of configurable electrochemical sensor, it is by supply module 1, memory cell 2, electrochemistry able to programme conditioning front end 3, electrochemical sensor 4, the integrated overall gas module of reference voltage source 5.

The electrochemical gas being made up of electric module 1, memory cell 2, electrochemistry able to programme conditioning front end 3, electrochemical sensor 4, reference voltage source 5 detects module E, described supply module 1 detects module to electrochemical gas and powers, and described memory cell 2 is connected to MCU module G by I2C bus, this MCU module is connected to computer (computer) by RS485 bus. The LMP91000 of described electrochemistry conditioning front end 3(able to programme such as American TI Company) be connected to MCU module G by I2C bus, LMP91000 can pass through I2C interface configuration, for electrochemical sensor provides required bias voltage, change amplifier gain, configuring needed parameter can be saved in the memory cell of electrochemical gas detection module E by computer in advance, described reference voltage source 5 is nursed one's health front end 3 for electrochemistry able to programme a reference voltage is provided, simultaneously with reference to Voltage-output.

When carrying out pre-timing signal, computer initiates to demarcate instruction, and single-chip microcomputer, by I2C bus, reads configuration parameter from the memory cell of gas detection module, re-uses I2C bus configuration programmable analog front end. and make programmable analog front end produce suitable voltage and gain. The reference voltage that single-chip microcomputer use sensor assembly provides, as the reference voltage of Chip Microcomputer A/D C module, can effectively avoid different reference voltage sources to gather and produce error ADC like this.

Be connected because single-chip microcomputer and computer adopt RS485 bus, can in RS485 bus, articulate multiple devices. And all identical sensor assemblies are put into same demarcation chamber, pass into calibrating gas, when passing into after marked gas, electrochemical sensor will generation current, by the transimpedance amplifier in programmable analog front end, convert current signal to voltage signal and amplify. Single-chip microcomputer repeatedly sampled voltage mean value is saved in the memory cell in sensor assembly as a reference value.

The foregoing is only preferred embodiment of the present utility model, protection domain of the present utility model is not limited in above-mentioned embodiment, and every technical scheme that belongs to the utility model principle all belongs to protection domain of the present utility model. For a person skilled in the art, some improvement of carrying out under the prerequisite that does not depart from principle of the present utility model, these improve and also should be considered as protection domain of the present utility model.

Claims (2)

1. the gas-detecting device that can demarcate in advance in batches configurable electrochemical sensor, is characterized in that, it comprises that electrochemical gas detects module, and this electrochemical gas detects module and comprises:

Electrochemical gas is detected to the supply module that module is powered;

Memory cell, it is connected to MCU module by I2C bus;

Electrochemistry conditioning front end able to programme, it is connected to MCU module by I2C bus, and this MCU module is connected to computer by RS485 bus;

Be connected to the electrochemical sensor of electrochemistry conditioning front end able to programme;

Be connected to the reference voltage source of electrochemistry conditioning front end able to programme.

2. the gas-detecting device that can demarcate in advance in batches configurable electrochemical sensor according to claim 1, is characterized in that, it is overall gas module that described electrochemical gas detects module.