For water quality professionals who need fast, accurate on-site chlorine detection, the ERUN-SP7-K6 Portable Free and Total Chlorine Meter delivers laboratory-grade precision with ±0.01 mg/L accuracy across a 0.02–10.00 mg/L measurement range, backed by CE, ISO 9001, and RoHS certifications. Whether you are monitoring drinking water, wastewater, food processing water, or swimming pools, this portable chlorine analyzer ensures compliance with international water safety standards through EPA-standard DPD colorimetric methodology.
A portable free and total chlorine meter is a handheld photometric instrument that measures both free chlorine (the active disinfectant form) and total chlorine (free chlorine combined with chloramines) in water samples using the DPD colorimetric method. Free chlorine indicates the active disinfection power available to kill pathogens, while total chlorine represents the sum of free and combined chlorine—both are critical parameters for verifying water safety in municipal supply, industrial processing, and recreational water systems.
The ERUN-SP7-K6 employs advanced optoelectronic technology and DPD colorimetric methodology, following EPA standard methods for reliable chlorine quantification. This single instrument eliminates the need for separate free and total chlorine testing devices, streamlining field workflows and reducing equipment costs.
Parameter | Specification |
|---|---|
Measurement Range | 0.02–10.00 mg/L |
Margin of Error | ≤ ±3% |
Repeatability | ≤ 2% |
Optical Stability | ≤ 0.002A/20min |
Accuracy | ±0.01 mg/L resolution |
Material | ABS, IP65-rated (waterproof, dustproof, corrosion-resistant) |
Standby Time | Up to 6 months |
Power Consumption | < 10W |
Dimensions | 410mm × 300mm × 130mm |
Weight | 4KG |
The ERUN-SP7-K6 portable chlorine tester features an automatic wavelength selection function, large LCD screen for easy operation, data storage and printing capabilities, and a one-click recovery function. Its IP65-rated ABS housing ensures reliable performance in demanding field environments—from water treatment plants to food processing facilities.
International certifications are non-negotiable for water quality instruments used in regulated industries. The ERUN-SP7-K6 carries CE certification (confirming compliance with EU health, safety, and environmental standards), ISO 9001 (validating quality management system adherence), and RoHS certification (ensuring restriction of hazardous substances).
For procurement managers, these certifications provide:
Regulatory acceptance: Certified instruments are recognized by health authorities and regulatory bodies worldwide.
Quality assurance: ISO 9001 certification indicates consistent manufacturing quality and reliable instrument performance.
Environmental compliance: RoHS certification ensures the instrument meets global environmental standards for electronic equipment.
When sourcing water quality testing equipment, certified instruments from reputable manufacturers reduce compliance risk and ensure measurement integrity.
Portable chlorine meters are essential across multiple industries where water disinfection must be verified. The ERUN-SP7-K6 is widely applied in:
Municipal Water Supply: Monitoring residual chlorine throughout the distribution network from source to tap ensures drinking water safety.
Food and Beverage Processing: Verifying sanitation water quality in food production facilities, where chlorine is used to control microbial growth.
Medical and Pharmaceutical: Ensuring water purity for pharmaceutical manufacturing and healthcare facility water systems.
Swimming Pools and Spas: Maintaining free chlorine levels between 0.3–1.0 mg/L to effectively kill bacteria and viruses.
Wastewater Treatment: Monitoring chlorine residuals in effluent discharge to meet environmental permit requirements.
The global portable chlorine meter market is experiencing steady growth, with projections increasing from $1.2 billion in 2025 to $1.9 billion by 2034, driven by rising regulatory scrutiny and water quality monitoring requirements worldwide.
The DPD (N,N-diethyl-p-phenylenediamine) colorimetric method is the industry-standard technique for chlorine analysis, recognized by EPA and international water quality organizations. When DPD reagent is added to a water sample containing chlorine, a color reaction occurs—the sample turns pink, with color intensity proportional to chlorine concentration. The portable photometer measures this color change at a specific wavelength (typically 520 nm) to quantify chlorine levels precisely.
The ERUN-SP7-K6 implements this method with high-precision optoelectronic technology, achieving ±0.01 mg/L resolution and ±3% accuracy—performance comparable to benchtop laboratory instruments. This ensures that field measurements are reliable enough for regulatory compliance and critical decision-making.
Q: What is the difference between free chlorine and total chlorine?
Free chlorine is the active, uncombined form of chlorine (hypochlorous acid and hypochlorite ion) that is immediately available for disinfection. Total chlorine is the sum of free chlorine and combined chlorine (chloramines). The difference between total and free chlorine indicates the presence of combined chlorine, which has weaker disinfecting power.
Q: What chlorine concentration is safe for drinking water?
Free residual chlorine in drinking water should typically be maintained between 0.3 and 1.0 mg/L to effectively kill bacteria and viruses while avoiding taste and odor issues.
Q: How often should a portable chlorine meter be calibrated?
Calibration frequency depends on usage conditions. Most portable photometers with factory calibration, like the ERUN-SP7-K6, maintain accuracy over extended periods. Regular verification with standard solutions is recommended for critical applications.
Q: Can this meter measure both free and total chlorine simultaneously?
Yes, the ERUN-SP7-K6 measures both free and total chlorine using the DPD colorimetric method with dedicated reagent protocols.
Q: What industries require portable chlorine testing?
Municipal water suppliers, food and beverage manufacturers, pharmaceutical companies, swimming pool operators, wastewater treatment facilities, and environmental monitoring agencies all require portable chlorine testing for regulatory compliance and quality assurance.
The ERUN-SP7-K6 Portable Free and Total Chlorine Meter combines laboratory-grade accuracy (±0.01 mg/L) with field-ready durability (IP65-rated, 6-month standby) and full international certification (CE, ISO 9001, RoHS) . With a 0.02–10.00 mg/L measurement range and EPA-standard DPD colorimetric methodology, this instrument delivers reliable chlorine measurements across municipal water, food processing, pharmaceutical, and recreational water applications.
For water quality professionals who demand precision, compliance, and reliability in a portable format, the ERUN-SP7-K6 represents a trusted solution backed by rigorous quality standards and proven optoelectronic technology.
Erun Environmental Protection is committed to providing high-precision water quality testing instruments that meet international standards, helping industries worldwide safeguard water safety and achieve regulatory compliance.
https://www.erunwas.com/products-detail/id-305.htmlFor detailed specifications and ordering information
