Can I still get replacement LDO probes for the Hach HQ10 and HQ20 meters?
Hach LDO probe for HQ10 and HQ20
Yes, The Hach LDO probes and the Hach LDO Sensor caps are still available for the old HQ10 and HQ20 meters Please see the links for information and current pricing.
The HQ10 and 20 have been replaced by the HQ30 and HQ40 meters which are available from Camlab. Please note that the sensor caps and the probes are not intechangeable with the new meters.
A number of customers have asked us for a definition of COD or Chemical Oxygen Demand which is detailed below:
Chemical oxygen demand (COD) is a measure of the capacity of water to consume oxygen during the decomposition of organic matter and the oxidation of inorganic chemicals such as ammonia and nitrite. COD measurements are commonly made on samples of waste waters or of natural waters contaminated by domestic or industrial wastes. Chemical oxygen demand is measured as a standardized laboratory assay in which a closed water sample is incubated with a strong chemical oxidant under specific conditions of temperature and for a particular period of time. A commonly used oxidant in COD assays is potassium dichromate (K2Cr2O7) which is used in combination with boiling sulfuric acid (H2SO4). Because this chemical oxidant is not specific to oxygen-consuming chemicals that are organic or inorganic, both of these sources of oxygen demand are measured in a COD assay.
Chemical oxygen demand is related to biochemical oxygen demand (BOD), another standard test for assaying the oxygen-demanding strength of waste waters. However, biochemicaloxygen demand only measures the amount of oxygen consumed by microbial oxidation and is most relevant to waters rich in organic matter. It is important to understand that COD and BOD do not necessarily measure the same types of oxygen consumption. For example, COD does not measure the oxygen-consuming potential associated with certain dissolved organic compounds such as acetate. However, acetate can be metabolized by microorganisms and would therefore be detected in an assay of BOD. In contrast, the oxygen-consuming potential of cellulose is not measured during a short-term BOD assay, but it is measured during a COD test.
You can find more about Camlab, Hach and Hanna COD – Chemical Oxygen Demand test vials and colrimters here. They maks measurement simple and do the calculations for you.
You can read more about the definition of COD here–> COD
Does the Hach Sension range of meters include a carry case?
The Hach Sension meters are an established range of portable and benchtop electrochemistry meters for pH, conductivity and Disssolved Oxygen.
The portable meters are all supplied with a carry case.
Hach Process LDO
The LDO dissolved oxygen sensor from Hach has made measuring DO in many samples much easier. Its robust and simple to use. However you need a new cap to calibrate the unit once a year, so which one do you need?
There are three versions in common use with our customers:
The original HQ10 and HQ20 Replacement sensor cap part Number HH/51812-00
The New HQD range including the HQ30 and HQ40 Replacement sensor cap part number HH/57911-00
Process LDO Replacement sensor cap part number HH/58112-00
