Parameters Lab Detection

Multiple & portable water quality instrument LH-M900 adopts method of spectrophotometry, which supports the wavelengths of 420nm, 470nm, 520nm and 620nm, and can support multiple parameter detection.Many experiments shows that this method is simple, quick and sensitive.The instrument is small size, light and easy to carry, suitable for field and work field use.By adopting imported sensor, advanced optical system and expanding the measuring range of colorimeter, the time needed for sample dilution is saved.Test items can be freely matched according to customer requirements.The instrument has been used in various environmental protection bureau, factory waste water discharge detection, aquaculture, lake and bay detection, river regulation, laboratory scientific research detection field.
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Product Details


Technical  parameter

Absorbance measuring range

0-3.0 Abs

Stability of optical path


Absorbance resolution


IP Class

IP65 above

LED operating life

100000 hours

Optical filter life

5 years

Rated capacity


Operating repeatable



420nm, 470nm, 520nm 620nm


1.Novel type,beautiful form

2.Professional optical path design, reliable optical performance. 
3.Small size,light weight,the protection grade is above than IP65,
4.1.69 inch OLED screen,can choose Chinese/English operation interface,

5.5 touch key,Acrylic protective panel,long life time,
6. Manually store the test results,save memory space,
7.The meter simulates USB flash drive,can store more than 5000 records, it is convenient to check the documents and easy to operate,

8.A variety of ways to supply power. USB & battery power supply.

COD: In environmental chemistry, the chemical oxygen demand (COD) is an indicative measure of the amount of oxygen that can be consumed by reactions in a measured solution. It is commonly expressed in mass of oxygen consumed over volume of solution which in SI units is milligrams per liter (mg/L). A COD test can be used to easily quantify the amount of organics in water. 

PH: pH is a measure of acidity or alkalinity.The hydrogen ion concentration index ((hydrogen ion concentration)) refers to the ratio of the total number of hydrogen ions to the amount of total substances in the solution. It is commonly referred to as "pH", not "pH". For the determination of hydrogen ion activity index, the qualitative method can be determined by using pH indicator and pH test paper, while the quantitative pH measurement needs to be measured by pH meter.

Phosphate is a chemical derivative of phosphoric acid. The phosphate ion (PO4)3−is an inorganic chemical, the conjugate basethat can form many different salts. In organic chemistry, a phosphate, or organophosphate, is an ester of phosphoric acid. Of the various phosphoric acids and phosphates, organic phosphates are important in biochemistry and biogeochemistry (and, consequently, in ecology), and inorganic phosphates are mined to obtain phosphorus for use in agriculture and industry. At elevated temperatures in the solid state, phosphates can condense to form pyrophosphates.

Ozone or trioxygen, is an inorganic molecule with the chemical formula O3. It is a pale blue gas with a distinctively pungent smell. It is an allotrope of oxygen that is much less stable than the diatomic allotrope O2, breaking down in the lower atmosphere to O2 (dioxygen). Ozone is formed from dioxygen by the action of ultraviolet light (UV) and electrical discharges within the Earth's atmosphere. It is present in very low concentrations throughout the latter, with its highest concentration high in the ozone layer of the stratosphere, which absorbs most of the Sun's ultraviolet (UV) radiation.

The nitrite ion, which has the chemical formula NO−2, is a symmetric anion with equal N–O bond lengths. Upon protonation, the unstable weak acid nitrous acid is produced. Nitrite can be oxidized or reduced, with the product somewhat dependent on the oxidizing/reducing agent and its strength. The nitrite ion is an ambidentate ligand, and is known to bond to metal centers in at least five different ways.Nitrite is also important in biochemistry as a source of the potent vasodilator nitric oxide. In organic chemistry the NO−2 group is present in nitrous acid esters and nitro compounds. Nitrite (mostly sodium nitrite) is also used in the food production industry for curing meat.Nitrate is a polyatomic ion with the molecular formula NO−3 and a molecular mass of 62.0049 u. Organic compounds that contain the nitrate ester as a functional group (RONO2) are also called nitrates.

Chlorine dioxide is a chemical compound with the formula ClO2. This yellowish-green gas crystallizes as bright orange crystals at −59 °C. As one of several oxides of chlorine, it is a potent and useful oxidizing agent used in water treatment and in bleaching.The compound has been fraudulently marketed as a cure for a wide range of diseases, including childhood autism. Children who have been given enemas of chlorine dioxide as supposed cure for childhood autism have suffered life-threatening ailments and even died. The FDA has likened the health effects of ingesting chlorine dioxide to those of ingesting industrial bleach.

Sulfide (British English also sulphide) is an inorganic anion of sulfur with the chemical formula S2− or a compound containing one or more S2− ions. Solutions of sulfide salts are corrosive. Sulfide also refers to chemical compounds large families of inorganic and organic compounds, e.g. lead sulfide and dimethyl sulfide. Hydrogen sulfide (H2S) and bisulfide (SH−) are the conjugate acids of sulfide.

Urea, also known as carbamide, is an organic compound with chemical formula CO(NH2)2. This amide has two –NH2 groups joined by a carbonyl (C=O) functional group. Urea serves an important role in the metabolism of nitrogen-containing compounds by animals and is the main nitrogen-containing substance in the urine of mammals. It is a colorless, odorless solid, highly soluble in water, and practically non-toxic (LD50 is 15 g/kg for rats).[5] Dissolved in water, it is neither acidic nor alkaline. Urea is widely used in fertilizers as a source of nitrogen (N) and is an important raw material for the chemical industry.

Ammonia nitrogen means nitrogen present in the form of free ammonia(NH3)and ammonium ions(NH4)in water. The nitrogen content of animal organic compounds is generally higher than that of vegetable organic compounds. At the same time, nitrogen-containing organic matter in human and animal feces is very unstable and easily decomposed into ammonia. Therefore, when the content of ammonia nitrogen in water increases, it refers to the nitride in the form of ammonia or ammonium ions.

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