CN205643228U - A pH value measurement circuit for water quality monitoring - Google Patents

Abstract

The utility model belongs to the technical field of water quality monitoring, concretely relates to a pH value measurement circuit for water quality monitoring can adopt the mode of electronic measurement to monitor the pH value of water to with the information output of changeing, then transmit control module, realized the non - chemical approach's of quality of water pH value measurement, and can carry out the automatic measure, don't artificial real -time measurement, saved the manpower.

Description

A kind of pH value measuring circuit for water quality monitoring

Technical field

This utility model belongs to water quality monitoring technical field, is specifically related to a kind of pH value measuring circuit for water quality monitoring.

Background technology

Water quality monitoring is to monitor and measure the kind of pollutant, the concentration of each pollutant and variation tendency, the process of evaluating water quality situation in water body.Monitoring range is quite varied, including not being contaminated and the most contaminated natural water (river, river, lake, sea and subsoil water) and various industrial water drainages etc..Main monitoring project can be divided into two big classes: a class is the aggregative indicator of reflection water quality condition, such as temperature, colourity, turbidity, pH value, electrical conductivity, float, dissolved oxygen, COD and Biochemical oxygen demand etc.；Another kind of is some noxious substances, such as phenol, cyanogen, arsenic, lead, chromium, cadmium, hydrargyrum and organic agricultural chemicals etc..For objective appraisal rivers and the situation of ocean water quality, in addition to above-mentioned monitoring project, sometimes need to carry out the mensuration of flow velocity and flow.

Water quality monitoring system is the monitoring system monitoring the multinomial water quality index such as the water temperature of tap water, pressure, flow, dissolved oxygen, pH value, water level, salinity and turbidity in real time, all kinds of water quality datas monitored in real time can be passed to, in pipe network intelligent monitor system Platform Server, have very important effect by water quality monitoring signal pickup assembly within the system.

Existing water quality monitoring system, measures the general method using chemical measurement for pH value, needs manually to carry out water sampling, measure and record, measure relatively difficult, and is difficult to conclusion and is analyzed in system.

Utility model content

The purpose of this utility model is to overcome pH value measurement in existing water quality monitoring to need to use chemical method to measure, the caused problem measuring difficulty.

For this, this utility model provides a kind of pH value measuring circuit for water quality monitoring, including comparator U1, comparator U2, resistance R1～R7, stabilivolt D1, electric capacity C1, and pH value probe, the positive input terminal of described comparator U1 electrically connects with pH value probe, the negative input end of comparator U1 is electrically connected with earth terminal by resistance R1, and the negative input end of described comparator U1 electrically connects also by the outfan of resistance R2 with comparator U1；

The outfan of described comparator U1 electrically connects also by the negative input end of resistance R3 with comparator U2, and the positive input terminal of described comparator U2 is electrically connected with earth terminal by resistance R6；

Described resistance R4 is a little connected with the positive electrical of+5V power supply, and the other end is electrically connected with earth terminal by stabilivolt D1, and described resistance R5 one end electrically connects with resistance R4 and stabilivolt D1 junction, and the other end electrically connects with the positive input terminal of comparator U2；

After described electric capacity C1 is in parallel with resistance R7, one end electrically connects with the negative input end of comparator U2, and the other end electrically connects with the outfan of comparator U2, and the outfan of described comparator U2 electrically connects with outfan OUT.

Described pH value probe is Ag probe or AgCl probe.

The beneficial effects of the utility model: this pH value measuring circuit for water quality monitoring that this utility model provides, the pH value of water is monitored by the mode that can use electronic surveying, and carry out converting output by information, it is then passed to control module, achieve the measurement of the non-chemical method of water pH value, and can automatically measure, the most artificial measurement in real time, save manpower.

Accompanying drawing explanation

Fig. 1 is the pH value measuring circuit schematic diagram for water quality monitoring.

Detailed description of the invention

Reach, by this utility model is expanded on further, technological means and effect that predetermined purpose is taked, below in conjunction with drawings and Examples to detailed description of the invention of the present utility model, architectural feature and effect thereof, describe in detail as follows.

Embodiment 1:

Use chemical method to measure to overcome pH value measurement in existing water quality monitoring to need, the caused problem measuring difficulty, this utility model provides a kind of pH value measuring circuit for water quality monitoring as shown in Figure 1, including comparator U1, comparator U2, resistance R1～R7, stabilivolt D1, electric capacity C1, and pH value probe, the positive input terminal of described comparator U1 electrically connects with pH value probe, and the negative input end of comparator U1 is electrically connected with earth terminal by resistance R1, and the negative input end of described comparator U1 electrically connects also by the outfan of resistance R2 with comparator U1；

The outfan of described comparator U1 electrically connects also by the negative input end of resistance R3 with comparator U2, and the positive input terminal of described comparator U2 is electrically connected with earth terminal by resistance R6；

Described resistance R4 is a little connected with the positive electrical of+5V power supply, and the other end is electrically connected with earth terminal by stabilivolt D1, and described resistance R5 one end electrically connects with resistance R4 and stabilivolt D1 junction, and the other end electrically connects with the positive input terminal of comparator U2；

After described electric capacity C1 is in parallel with resistance R7, one end electrically connects with the negative input end of comparator U2, and the other end electrically connects with the outfan of comparator U2, and the outfan of described comparator U2 electrically connects with outfan OUT.

Described pH value probe is Ag probe or AgCl probe；Output signal 59.16mV/pH, when 25 degrees Celsius, outfan OUT output voltage is 0V, and now pH value is 7.

This is used for the pH value measuring circuit of water quality monitoring, the pH value of water is monitored by the mode that can use electronic surveying, and carry out converting output by information, it is then passed to control module, achieve the measurement of the non-chemical method of water pH value, and can automatically measure, the most artificial measurement in real time, save manpower.

In actual applications, the parameters of circuit can be according to the required precision of reality application, considering cost, the factor such as effect of acquirement, mate, measured can draw the pH value wanted, and be transmitted to control module, control module control display pH information or be transferred on the platform of water quality monitoring system.

Above content is to combine concrete preferred implementation further detailed description of the utility model, it is impossible to assert that of the present utility model being embodied as is confined to these explanations.For this utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, it is also possible to make some simple deduction or replace, all should be considered as belonging to protection domain of the present utility model.

Claims (2)

1. the pH value measuring circuit for water quality monitoring, it is characterized in that: include comparator U1, comparator U2, resistance R1～R7, stabilivolt D1, electric capacity C1, and pH value probe, the positive input terminal of described comparator U1 electrically connects with pH value probe, and the negative input end of comparator U1 is electrically connected with earth terminal by resistance R1, and the negative input end of described comparator U1 electrically connects also by the outfan of resistance R2 with comparator U1；

The outfan of described comparator U1 electrically connects also by the negative input end of resistance R3 with comparator U2, and the positive input terminal of described comparator U2 is electrically connected with earth terminal by resistance R6；

Described resistance R4 is a little connected with the positive electrical of+5V power supply, and the other end is electrically connected with earth terminal by stabilivolt D1, and described resistance R5 one end electrically connects with resistance R4 and stabilivolt D1 junction, and the other end electrically connects with the positive input terminal of comparator U2；

After described electric capacity C1 is in parallel with resistance R7, one end electrically connects with the negative input end of comparator U2, and the other end electrically connects with the outfan of comparator U2, and the outfan of described comparator U2 electrically connects with outfan OUT.

A kind of pH value measuring circuit for water quality monitoring, it is characterised in that: described pH value probe is Ag probe or AgCl probe.