LOHMET
Designed in-house, building our brand together
Focused on water quality analysis, empowering brand partners
Manufacturer of online water quality analyzers with proprietary hardware and firmware, offering one-stop OEM/ODM solutions from reference standards to fully branded complete units.
Core Team Industry Experience
Core Team Experience
Countries covered by the team's past projects
Past Project Countries
Past Projects Delivered by the Team
Past Projects Delivered
Project History Evaluation
Positive Project Feedback
Core Products
Core Products
LHM-HD-A
Online Hardness Analyzer
Online Hardness Analyzer
Real-time online monitoring of total water hardness, ideal for industrial applications such as boiler feedwater and cooling circulation systems. Supports 4-20mA and RS485 communication outputs.
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LHM-PH
pH Controller
pH Controller
High-precision online pH monitoring and control with integrated dosing automation, widely used in water treatment, chemical processes, and food & beverage industries.
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LHMA-2100CL
Online Chlorine and Total Chlorine Analyzer
Residual/Total Chlorine Online Analyzer
Online continuous monitoring of free and total residual chlorine in water using DPD colorimetry for stable, reliable, unattended operation in applications such as drinking water, recirculating water, and wastewater treatment. The LMTA-2100CL employs the classic DPD (N,N-diethyl-p-phenylenediamine) colorimetric detection principle (per GB/T 11898-1989, "Water quality — Determination of free and total chlorine by N,N-diethyl-1,4-phenylenediamine spectrophotometry"). After the sample and reagents mix and develop color in the reaction cell, a photodetector measures color intensity to calculate residual chlorine concentration. Unlike electrode-based methods, colorimetry is unaffected by pH, temperature, turbidity, or electrode drift, delivering stable, repeatable results without requiring periodic membrane replacement—ideal for long-term continuous online operation. The instrument integrates automatic sampling, reagent dosing, color development, colorimetric measurement, and drain cleaning. It features a 4.3-inch touchscreen display and supports 4–20mA and Modbus-RTU communication for remote integration with PLC and SCADA systems.
View Details →OEM/ODM Partnership
OEM/ODM Partnership
Offer both OEM standard product and custom development models, with full-process technical support from product selection and solution design to mass production.
Standard Product OEM— Use existing products with your brand logo
Custom DevelopmentCustom hardware, firmware, and design tailored to your needs
Proprietary Hardware Firmware
Core sensing module and control algorithm developed entirely in-house.
Industrial-grade quality
Rigorous quality control system built for harsh industrial environments
Flexible OEM Partnerships
Standard Product Labeling and Custom Development Dual-Mode
Technical Support Response
Professional engineering team provides timely technical support.
Success Stories
Case Studies
Online Hardness Monitoring of Boiler Feedwater for a Major Power Group
Device:LHM-HD-A Online Hardness Analyzer
Deployed across 12 power plants to monitor boiler feedwater hardness in real time, trigger alerts on threshold breaches, protect heat exchange equipment, and ensure continuous stable operation for 18 months.
Automatic pH Control System for Circulating Cooling Water in Chemical Industrial Parks
Device:LHM-PH pH Controller
Provided 30 LHM-PH pH controllers for a chemical industrial park to enable automatic monitoring and dosing linkage control of circulating cooling water pH, significantly improving water quality compliance rates.
Online Chlorine Residual Monitoring Project for Municipal Water Treatment Plant
Device:LHM-CL Free Chlorine Analyzer
Deploy LHM-CL free chlorine analyzers for the city's water authority at key nodes, including finished water and network extremities, to ensure safe water disinfection.
News & Updates
Latest News
LOHMET to exhibit at the 2027 Shanghai International Water Treatment Exhibition
LOHMET will attend the 2027 Shanghai International Water Treatment Expo with its full range of water quality analysis instruments, offering opportunities to exchange technical solutions and explore partnerships with industry peers.
Water Hardness Unit Conversion
Water hardness is a key indicator of divalent metal ions like calcium and magnesium in water. Different units are used across industrial water treatment, boiler feedwater, pure water production, and municipal supply systems. This table uses CaCO₃ (calcium carbonate) as the standard conversion reference.
LOHMET Online Hardness Analyzer LHM-HD-A Officially Launched
After years of independent R&D, LOHMET launches a new generation of online hardness analyzer featuring a proprietary sensor module for more stable measurements and easier maintenance.
Industry Applications
Industries We Serve
Boiler Room
Boiler Room
cooling tower
Cooling Tower
Water Softening and Reverse Osmosis
Softening & RO
Water Treatment Plant
Water Treatment Plant
Wastewater Treatment Plant
Wastewater Treatment Plant
Seawater Desalination
Desalination