Chemical plant alkaline concentration monitor

1、 Instrument Introduction

Shanghai Xuantian SJT-6000A typeChemical plant alkaline concentration monitorIt is a precision instrument designed for industrial scenarios based on electrode measurement principles, used for real-time and continuous monitoring of alkaline solution concentrations such as sodium hydroxide (NaOH). It collects the physical and chemical properties of the solution (conductivity, refractive index, density, etc.) through sensors, and outputs accurate concentration values after signal processing and temperature compensation.

2、 Main features

1. Real time online monitoring
Continuous measurement (response time usually<30 seconds), real-time reflection of changes in liquid alkali concentration, avoiding the lag of offline sampling analysis, and facilitating timely adjustment of processes (such as controlling the amount of liquid alkali added in acid-base neutralization reactions).

2. Adapt to industrial working conditions
The electrode material and equipment structure (waterproof, corrosion-resistant shell) are resistant to high concentrations of liquid alkali, high temperatures (such as 0-90 ℃), and certain impurities (such as a small amount of suspended particles), making them suitable for harsh environments in industrial sites.

3. Automation and Intelligence
Equipped with automatic temperature compensation function (to solve the impact of temperature on conductivity), data can be directly connected to the production control system to achieve closed-loop control (such as automatic adjustment of liquid alkali injection amount).

4. Easy to operate and low maintenance
No need for complex reagents (only standard solution for calibration), avoiding the problems of reagent consumption and waste liquid treatment in chemical methods (such as titration); Daily maintenance mainly involves regular cleaning of electrodes (to prevent scaling from affecting measurements), with low maintenance costs.

Chemical plant alkaline concentration monitorTypical application scenarios

1. Accident chlorine absorption system

Regulatory requirements: The "Technical Specification for Chlorine Gas Safety in Chemical Enterprises" (GB11984-2024) clearly stipulates that the concentration of alkali solution absorbed by accident chlorine should be maintained at 15%~20%, and should not be lower than 5% when changing alkali.

Monitoring value: Real time warning of abnormal concentration, automatic activation of concentrated alkali addition or water dilution, forming a closed-loop control to eliminate the risk of chlorine gas overflow.

2. Chlor alkali production process

Monitoring of caustic soda concentration at the outlet of the electrolytic cell (32%, 50%).

Control the evaporation and concentration process to ensure product quality consistency.

Monitoring the concentration of alkaline solution in the circulating water system to prevent equipment corrosion.

4、 Technical indicators

Product model: SJT-6000A

Measurement range: 0-50% (depending on the sensor)

Screen display: LCD digital display

Resolution: 0.01%

Accuracy: ± 1.5%

Temperature compensation: automatically compensates for temperature up to 100 ℃

Relays: 2 sets of relay outputs

Current output: 4-20mA current output

Communication: RS-485 digital communication

Working conditions: The ambient temperature is 0-60 ℃, and the relative humidity is ≤ 90%

Working voltage: 220VAC/DC24V

Installation method: panel installation/wall mounted

Protection level: IP65

sensor

Measurement range: 0-50%

Measurement accuracy: ± 1.5%

Resolution: 0.01%

Repeatability: ± 0.5% FS

Pressure range: 0-0.5MPa

Temperature range: 0-90 ℃

Calibration interval:>90 days

Cable: Standard 5m (extended to 30m without signal amplifier)

Installation method: Immersion/Flow/Pipeline/Insertion

Protection level: IP68 waterproof