Phosphates are particularly important for the growth and development of plant roots, and hence are one of the most common fertilizers used in agriculture.
   In addition, phosphates are usually utilized in detergents and are needed, in small quantities, for heating systems. However, high concentrations of phosphates can cause environmental pollution: they are for example a primary cause of eutrophication.
   For these reasons, it is necessary to closely monitor the phosphate levels present in both civil and industrial waste water.
   In order to cater to the different needs of users in a wide array of applications, the phosphate meters have been designed to cover the following ranges:
   • From 0.00 to 2.50 mg/L (HI 93713)
   • From 0.0 to 30.0 mg/L (HI 93717)
Specifications
   Range 0.00 to 2.50 mg/L
   Resolution 0.01 mg/L
   Accuracy ±0.04 mg/L ±4% of reading
   Light Source LED 890 nm
   Light Life Life of the instrument
   Light Detection Silicon Photocell
   Battery Type / Life 1 x 9V / approx. 40 hours of continuous use;
   auto-off after 10 minutes of non use
   Environment 0 to 50°C (32 to 122°F); RH max 95% non-condensing
   Dimensions 180 x 83 x 46 mm (7.1 x 3.3 x 1.8")
   Weight 290 g (10 oz.)
   Method Adaptation of the ascorbic acid method;
   The reaction between phosphate and the reagent causes a blue tint in the sample