KHC0D-12ZStandardized COD digestion unit, utilizing microcomputer technology, capable of simultaneously heating and refluxing digestion for 12 250ml conical flasks. Fully complies with the national standard method HJ828-2017, ensuring boiling for 2 hours.

  KHC0D-12ZStandardized COD Dissolution Unit with a special heating plate panel.Microcrystalline glass countertops, overall structure, reasonable air gap design, easy to install and replace electric stove tops.Uniform heat distribution during heating, with quick升温 and 降温 processes. Additionally, cleaning up any accidental spills of the sample solution is more convenient.

 KHC0D-12ZStandardized COD Dissolution Apparatus with adjustable dissolution time, countdown display for dissolution time, automatically stops heating upon completion, the instrument fan continues to operate to assist in sample cooling, and can be unattended.

KHCOD-12ZType GB standard COD digestion回流 deviceAnother innovation that alters the fixed heating power of conventional COD dissolvers, eliminating issues of boiling over in summer and under-boiling in winter. Utilizes silicon-controlled rectifier for adjustable heating, ensuring optimal boiling results.

　KHC0D-12ZStandard COD digestion apparatus with glass burr reflux tubes in place of spherical reflux tubes, and using air-cooling and water-cooling techniques instead of recirculating water cooling, making operation more convenient. The cooling section is mainly achieved by water-cooled burr condensers and fan air-cooling. The upper part of the condenser is spherical, providing better cooling effects, with the catalyst added here to prevent the instant volatilization of light components in the sample and allowing for a cover with a volatile cap. The lower part is shaped like "burrs," with multiple opposing "cooling bubbles" extending from the condenser wall on a plane, which increases the cooling area more than a simple spherical condenser and can block the passage of volatile substances and vapors. This is further enhanced by the dual action of the cooling water in the upper spherical reflux tube and the internal fan of the machine.

KHC0D-12ZStandardized COD Dissolution Apparatus with回流Cooling and Insertable Bristle Reflux Tube for Enhanced Safety and Stability.

Technical Specifications:

National Standard: New Standard HJ828-2017

Measurement Range: 5-700 mg/L; diluted water samples measured from 700 mg/L to 10,000 mg/L

Dissolution Time: 1 minute to 2 hours and 30 minutes (user selectable heating time)

Measurement Error: The relative standard deviation of the phthalic acid hydrogen potassium standard solution (500mg/L) is not more than 5.0%.

        Industrial organic wastewater (500 mg/L) relative standard deviation not exceeding 8.0%

Ambient Temperature: ≤ 40℃

Cooling Method: Dual-fan air cooling with 3-tube condenser water cooling

Sample Dissolution Quantity: 12 x 250ml conical flasks, dissolution by heating in three rows on a microcrystalline plate, easy and clean sampling.

Heating Power: ＜2400W (AC 220V, 50Hz) (adjustable power)

Heating Surface: Microcrystalline glass heating surface, integrated heating plate structure, suspended heating, easy replacement and maintenance by simply removing.

Instrument dimensions: 452*372*620mm (H)

Note: KHCOD-8ZGB Standard Method for Chemical Oxygen DemandFlow Diverting Device (8)250mlConical flask