Description: Various phosphorous compounds in the water sample are turned into orthophosphoric acid ions by oxidative digestion of potassium persulphate in high-temperature and high-pressure acid environment. Orthophosphoric acid ions react with ammonium molybdate and antimony potassium oxide tartrate to produce phosphomolybdic acid before being reduced by ascorbic acid to produce blue complexes. Then, the concentration of total phosphorus in the water sample is obtained by optical determination combined with data processing and calculation.

Features
During the testing process, the tested sample is firstly taken to rinse the pipeline, dosing tank and reaction pool, eliminating memory effects produced by the instrument during measurement to make the measurement result more coincide with the actual value.
The unique optical dosing system guarantees highly precise sample dosing and more accurate measurement result.
The action of air-blowing agitation, high temperature, high pressure and catalyst promotes reaction.
The unique fan pipeline persistently forcing the cooling system makes the measurement cycle shorter.

Accuracy: The user may set the automatic calibration time, and select two different standard samples according to the variation of measurement range, making the instrument have desirable linearity and guaranteeing its accuracy.

Easy operation: The instrument may store up to thousands of arrays of data, adopt touch screen technique and hierarchical management over menus, output COD with 4-20mA analog and transmit COD by MODBUS RTU Protocol, and provide the special protocol data interface according to user requirements, thus ensuring easy operation of the instrument.

Reliability: The unique structural design adopted makes the circuit and pipeline of the instrument mutually independent and fully isolated so as to avoid mutual influence and guarantee reliability of the instrument.

Consistency: Under certain reaction conditions, digestion is performed, and digestion time may be set to guarantee sufficient reaction, making the measurement value of total phosphorous quite consistent with the actual value of the water sample.

Security: With the transparent safety guard panel employed, the instrument can only be operated when the panel is well mounted; the panel can only be opened when the instrument is out of operation and in a secure condition.
Intelligentization: When the instrument fails, failure points and corresponding causes may be diagnosed automatically and displayed on the touch screen to guarantee the intelligent instrument.

Convenience: Nanjing Panda provides various reagents for the complete set of instruments, so users may avoid a variety of complicated chemicals and dangers to ensure convenience to them.

Technical Parameters: