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pH controller

A controller and control module technology, applied in the field of control, can solve the problem of high price

Active Publication Date: 2016-09-21
杭州美仪自动化有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, regardless of whether it is a foreign or domestic PH controller, the current transmission output adopts the D / A method. Although the D / A method has high precision, the price is also higher than the pwm method.

Method used

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Experimental program
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Embodiment Construction

[0042] The present invention will be further described below in conjunction with accompanying drawing.

[0043] Such as figure 1 As shown, the PH controller includes a control module 1, a PH / ORP acquisition module 2, a temperature acquisition module 3, a man-machine interface 4, an operation status indication module 5, a reference module 6, an LDO voltage regulator module 7, an alarm indication module 8, a beeper Sounder module 9, RS485 communication module 10, transmission output module 11, negative pressure conversion module, main control system filter module and relay alarm module; control module 1 controls the light-emitting diode of alarm indication module 8 to turn on and off; man-machine interface 4 Connect to the control module.

[0044] Such as figure 2As shown, the control module 1 includes a main control chip U5, an eighth resistor R8 and a ninth resistor R9; the model of the main control chip U5 is STM8L052R8; the 6-pin of the main control chip U5 is connected t...

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PUM

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Abstract

The invention discloses a PH controller. The cost of the existing PH controller can be further controlled. According to a control module, PH / ORP acquired by a PH / ORP acquisition module and temperature acquired by a temperature acquisition module are compared with that of a reference module, and code values acquired by the PH / ORP acquisition module and the temperature acquisition module are converted into PH values through a PH electrode algorithm; the PH values are converted into 4-20mA transmitting current by the control module through a PH / ORP transmitting output algorithm, and 4-20mA transmitting current is remotely transmitted through a transmitting output module; the PH values are converted by the control module through a standard MODBUS protocol and outputted through an RS485 communication module; and the control module controls the buzzer of a buzzer module to alarm and controls the light-emitting diode of an alarm indicating module. Current transmitting output adopts a pwm mode of which the precision is beyond that of a D / A mode. An isolation module is also omitted from a power supply module so that the cost can be greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of control, and in particular relates to a PH controller with low cost and low interference degree of current transmission output. Background technique [0002] PH controller is one of the intelligent online chemical analysis instruments, widely used in continuous monitoring of PH value or OPR value and temperature in solutions such as thermal power, chemical fertilizer, metallurgy, environmental protection, pharmaceutical, biochemical, food and tap water. [0003] Foreign PH controllers have a short stabilization time, but the cost is high; in fields such as sewage treatment, the requirements for the stabilization time of PH controllers are not high, and high-cost PH controllers will increase the burden on enterprises. Therefore, foreign PH controllers The device is not a good choice for fields such as sewage treatment. [0004] Although domestically produced PH controllers have a price advantage, the cost...

Claims

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Application Information

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IPC IPC(8): G05D21/02
CPCG05D21/02
Inventor 邓泽微丁程范光兴林以成邹丽娜周丽连蒋艳
Owner 杭州美仪自动化有限公司