COD reflux digestion instrument

The standard microcrystalline COD digester uses a glass burr reflux tube instead of a spherical reflux tube and air cooling technology instead of tap water cooling. The cooling part is mainly completed by a burr condenser tube and a fan. The upper part of the condenser tube is spherical, and the catalyst is added from here to prevent the instantaneous evaporation of light components in the sample. The lower part is "burr" shaped, with three opposing spherical condenser tubes extending from the condenser tube wall on a plane. In addition, the dual effect of cooling water and fan in the upper spherical reflux tube ensures the reflux cooling of the sample.

The standard microcrystalline COD digester adopts imported microcrystalline panels. The panel is a high-temperature resistant microcrystalline board that can withstand 800 ℃, with uniform heating on the surface and fast heating and cooling rates. The heating part uses a new type of imported high-temperature resistant ceramic fiber heating plate. The bottom plate and surrounding heat loss of the digester are small, and the heating and thermal conductivity are uniform, resulting in higher thermal efficiency.

1. Microcrystalline panels are flat, smooth, and easy to clean; If the surface is contaminated, simply wipe it dry with a cloth to reduce damage to the instrument caused by improper operation.

2. The new type of glass burr reflux tube and heat dissipation system ensures the parallelism and accuracy of sample digestion results due to its excellent digestion reflux effect.

3. Digital display of microcrystalline panel temperature, temperature range (between 100 ℃ -440 ℃).

4. Digital display of digestion time: The digestion time is between 0-180 minutes.

5. After digestion is complete, the instrument automatically stops heating, the heating indicator light goes out, and there is a prompt sound. The fan cools the sample for digestion. After a delay of 120 minutes, it automatically stops and the cooling indicator light goes out.

6. Energy and water conservation, safety and reliability have improved the work efficiency of operators.

The standard microcrystalline COD digester mainly consists of four parts: body, reflux pipe, fan, microcrystalline heating plate, etc. It uses microcomputer PID technology to control the heating of the electric furnace plate and fan at a fixed time, and can simultaneously heat 12 digestion bottle reflux devices. The chemical solution preparation, operation, and COD calculation of the instrument follow the (HJ828-2017) dichromate method. For COD water samples below 50mg/L, the accuracy can be improved by diluting the titrant and oxidant. For COD water samples above 700mg/L, the determination can be completed by diluting the water sample proportionally.