How to maintain the 807 Dosing Unit

The 807 Dosing Unit requires regular maintenance to ensure optimal performance and longevity. Learn about best practices for daily cleaning, how to unblock a valve disk, and how to properly clean and grease the 807 Dosing Unit.

Best practice: Automated cleaning

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Solutions such as potassium hydroxide in isopropanol, silver nitrate, or iodine can crystallize and form deposits on the glass wall. Since these deposits can destroy the piston and cause leakage, it is essential to clean the glass cylinder of the Dosing Unit daily.

The automated cleaning procedure (best practice procedure) is easy to implement into your daily analysis routine.

This video shows:

Working principle of cleaning procedure
Necessary hardware components
Setup of the hardware
Additional handling tips

Unblocking the valve disk

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Especially after a period of inactivity, the valve disk of your 807 Dosing Unit can become blocked. This video shows you how to unblock the valve disk of your Dosing Unit without breaking it.

This video shows:

Removal of Dosing Unit
Cleaning of Dosing Unit
Reassembly of Dosing Unit
Mounting of Dosing Unit
Tips to prevent blockage

Cleaning and greasing

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You should regrease your Dosing Unit from time to time as some solutions are fat-dissolving. If the regreasing is not performed regularly, its valve disk can become blocked.

This video shows:

Cleaning before greasing
Greasing procedure
Reassembly of Dosing Unit
Additional handling tips

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From Reaction to Release: Raman and NIR Analysis for Fertilizer Production

Fertilizer production depends on timely chemical measurements, but reference techniques such as titration and ICP-OES can require sample transport, preparation, reagents, specialized analysts, and significant time before results are available. Raman and near-infrared spectroscopy can provide faster, simpler analysis closer to production while reducing reagent use and cost per measurement. Using examples from phosphate, urea, ammonium nitrate fertilizer production this webinar will explore the development of quantitative spectroscopic methods, from collecting representative production samples and reliable reference data through calibration and independent validation. The session will also examine method transfer and deployment across instruments and production sites. Adam J. Hopkins, Ph.D., Product Manager for Spectroscopy at Metrohm USA, will introduce Raman and NIR fundamentals and the Metrohm products, sampling options, and software used for production measurements. Hannah Schorr, Ph.D., Applications Specialist for Spectroscopy at Metrohm USA, will then present the analytical science behind the fertilizer applications, including how quantitative methods are developed, validated, transferred, and maintained for reliable routine analysis.