Ammonium Hydroxide

Dynatrol® Density Measurement Systems are used extensively for measurement and control of density, specific gravity, or percent concentration with Ammonia solution, also known as ammonium hydroxide, ammonia water, ammonical liquor, ammonia liquor, aqua ammonia, aqueous ammonia, or simply ammonia.

  • Eliminate multiple hand sampling when mixing
  • Real time percent concentration measurements of ammonium hydroxide with no effects from pressure changes or pipe vibration
  • Virtually no maintenance costs

Automation Products, Inc. was approached by a chemical company to devise a solution for online measurement of an ammonia solution. The process is describer below.


The chemical company needed online measurements while mixing anhydrous ammonia with water. Their pressurized ammonia was bubbled into a mixing tank with ultra pure water, and a sample stream was constantly pumped from the bottom of the tank to give a real time reading of percent concentration for aqueous ammonia.


The chemical company chose a Dynatrol® Density System to solve their problem. The Dynatrol® Density Meter has the Temperature vs. Density vs. Percent concentration curves programmed into the Series 2000 Digital Density Converter. The density meter provides 4-20 mA signals to the chemical company’s control room for percent concentration and temperature of the ammonia and water solution. Since the Dynatrol® Density Meter outputs percent concentration, there was no need to program a complicated set of algorithms into the DCS control system to calculate percent concentration from density.

After months of comparing hand sample measurements to the measurements of the Dynatrol® Density Meter, the company found that the Dynatrol® Density Meter correlated directly to the hand measurements. The company now uses the Dynatrol® Density System in the control of the mixing process. This eliminates the bi-hourly hand sampling that technicians would have to perform.

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Power Plant

Dynatrol® instruments provide Bulk Solids Level Measurement of fly ash applications, Density Measurement of water treatment chemicals, various liquors and lime slurries and Viscosity Measurement of fuel oil and waste oil.

Bulk Solids Level Detection

Dynatrol® CL-10DJ series level switches are used for fly ash applications in power generation plants and for fly ash collection. These level indicators are also used in applications where fly ash is used as a filler. Our CL-10DJ level probes are made from high strength stainless steel. For more abrasive or corrosive service, our level switches can be made from other materials. These level switch probes are well suited for the high temperature and harsh environments that are always a part of fly ash applications.

Density Measurement

The Dynatrol® CL-10HY Density Cell and Series 2000 Digital Density Converter can be used to measure density, specific gravity or percent solids of water treatment chemicals such as caustic soda or sulphuric acid. Our equipment is also used to measure black liquor, green liquor and lime slurries, etc. at process conditions.

Our application software is written to use temperature and density information that comes from the CL-10HY cell to calculate various units at process conditions

Viscosity Applications

The Dynatrol® CL10-DV series Viscosity Meter and Series 3000 Viscosity Digital Converter are used to measure the viscosity of fuel oil in fuel oil to burner applications. Thus, helping to increase combustion efficiency and decrease particulate emissions. Dynatrol® Viscosity Systems are also used in waste oil incineration and waste oil pumping applications.

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Ethylene Glycol

The Dynatrol® CL-10HY Density Cell and Series 2000 Digital Density Converter can measure the temperature and density of an ethylene glycol process stream. Applications may include antifreeze and deicing fluid, also for use in manufacturing of resins and polyester fibers in the plastics industry, as well as removing water vapor during natural gas production.

How it works: The Series 2000 Digital Density Converter processes basic information from the Density Cell to calculate density at a reference temperature. The process value can be used to calculate the specific gravity, Baumé and percent concentration. This information is made available to the operator or process engineer.

The standard Series 2000 has an analog output corresponding to either of these process variables. Optionally, it can be programmed to have two analog outputs that can be calibrated for any two process variables. (Density, Temperature, Baumé, Specific Gravity, Percent Concentration)

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Dynatrol® Density Systems are used worldwide in pipeline applications for measurement and control of density, specific gravity, API gravity or percent concentration. Typical applications are custody transfer or interface measurement and may include crude oil, refined products or various other chemicals.

Dynatrol® Density Cells are used to measure the liquid being transported in the pipeline. The Cell’s operation is extremely accurate and dependable, requiring no pressure compensation.

Working with the Density Cell, the Dynatrol® Digital Density Converter translates the product density and temperature readings into the customers’ required units of measurement. For example, if a United States pipeline requires the American Petroleum Institute (API) scale or a Canadian Pipeline requires output in kilogram per cubic meter (kg/m 3), Dynatrol® electronics are programmed for each application’s specific measurement needs.

The Dynatrol® Systems are user-friendly. Converters come pre-programmed for simple calibration. Many Dynatrol® Density Cells have sustained accuracy in the field without need of service for over 20 years!

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Pulp and Paper

Dynatrol® instruments are used for a variety of applications in the Pulp and Paper industry. Measure the Density or percent concentration of alkalies, acids and coatings, determine the Viscosity during the pulping/bleaching process or assess point Level Detection of wood chips in bins. Our Interface level probes can be used to detect the interface between black liquor and soap.

Density Measurement

The Dynatrol® CL10-HY Density Cell and Series 2000 Density Digital Converter are designed for continuous measurement and control of density or percent concentration for alkalies, acids and coatings such as:

  • corn starch
  • potato starch
  • sizings
  • clay coatings
  • and more...

Viscosity Measurement

The Dynatrol® CL10-DV series Viscosity Meter and Series 3000 Viscosity Digital Converter are used to measure the viscosity during the pulping/bleaching process. Dynatrol® Viscosity Meters are being used for the following applications:

  • Alkaline Waste Black Liquor
  • Black Liquor
  • Black Liquor Sludge
  • Black Liquor Soap Interface
  • Cellulose Acetate Dope
  • Cellulose Solutions
  • Green Liquor
  • Low-viscosity Cellulose
  • Pulp Slurry Additives
  • Resins for Tissue Making & First Layer of Paperboard
  • Softwood Sulfite Pulp
  • Terpene Resin

Bulk Solids Level Detection

The Dynatrol® CL-10DJ Level Detector is used for high, intermediate or low level detection of wood chips in chip bins, hoppers, silos, etc.

Interface Level Detection

The Dynatrol® CL-10DJI Level Detector is used for level detection of black liquor and soap.

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