HMT 1000 oil mist separator heatable modular testing system

Quality assurance and the development of filters/separators/traps should ideally be carried out under testing conditions that are relevant to the actual conditions encountered. Therefore, the oil separator must be tested at high temperatures up to 120 ° C and, depending on the application type, at high pressures.

Using the modular testing system HMT 1000, the oil separator (such as for separating aerosols blown in internal combustion engines or for separating oil mist downstream of compressors) can be quickly and accurately characterized, and successfully tested through isothermal particle measurements up to 120 ° C under practical conditions

• Classification separation efficiency
• Load/hold time
• Total separation efficiency/weight analysis
• Pressure loss

Due to the modular layout, individual components of the test bench, such as the high-resolution heatable light scattering spectrometer Promo, are included ® 1000 H， Both the heatable dilution system KHG 10 D and the heatable aerosol generator PLG 2100 can be easily removed from the HMT 1000 and used for other applications, such as direct measurement on the engine.

Over the years, multiple companies around the world have evolved from Palas, which are heatable and pressure resistant ® Beneficial from the testing component, it is used for isothermal and isobaric particle size and quantity measurement of oil mist.

Palas ® The HMT 1000 filter test bench has been used in the global industry since 2001 and has achieved great success.

The core of HMT 1000 is the light scattering spectrometer Promo ® 1000 H， It is used to measure particle size and particle quantity (and therefore concentration) independently of each other simultaneously. With Promo ® 1000 H， Can perform very fast, clear, reproducible, and isothermal measurements.

Figure 1: Promo ® 1000 H

The advantages of optical particle measurement over pure weight analysis measurement are:

Traditional quantitative weight analysis measurements are often not fast or sensitive enough, and cannot provide information about particle size distribution. Due to the excellent correlation between quantitative distribution measurement and weight analysis, it ensures very fast and volume dependent testing of oil separators. You can use Promo ® The 1000 H system determines the concentration of clean gas within 1 minute.

Why use isothermal measurement?

The viscosity of oil - and therefore the size and concentration of particles in oil mist - varies as a function of engine temperature. Therefore, oil separators must be tested at different temperatures, such as with different particle sizes (up to about 5-8 µ m) and particle concentrations (about 105-107 particles/cm3), as well as different volumetric flow rates, in order to clearly characterize their separation ability. The changes in the separation characteristics of the separator, such as changes in volume flow rate, temperature, filter load, etc., must be clearly determined through reliable online or on-site measurements. To avoid condensation and evaporation effects on HMT 1000, the entire aerosol conduit (including preparation, sampling, and measurement volumes) can be heated to 120 ° C. This allows for isothermal measurement of the separation efficiency of the stages. Isothermal in-situ measurement, such as on an engine

The HMT 1000 testing system is mobile and has a modular layout. Therefore, individual components can also be used for other tests and particle measurements, such as in-situ measurements on engines.

Figure 2: Isothermal particle sampling and on-site measurement using Palas ® FTControl software for automatic measurement data collection

The software has been tested and tested using particles, and can achieve fully automatic characterization of the oil mist separator. This means that the results are independent of the personnel operating the test bench (see "Software" product group: FTControl). Test bench control:

Automatic control of volumetric flow rate
The automatic activation process of aerosol generator
Automatic switching between raw gas/clean gas measurement points
• Automatic temperature regulation
Evaluate and record measurement signals, such as Dp, relative humidity, temperature, volumetric flow rate, absolute pressure, etc.

Automatic measurement process:

• Automatically evaluate pressure loss curve
• Automatic measurement of classification and separation efficiency
• Automatically evaluate the pressure loss curve under different loading states, including measuring the efficiency of graded separation

Figure 3: Comparison of different oil separators

HMT 1000 oil mist separator heatable modular testing systemAdvantages:

HMT 1000 oil mist separator heatable modular testing systemApplication:

Quality assurance of oil separator
New and further developments in oil separators, such as coalescence separators, cyclone separators, and other inertial separators, electric filters, and filter combinations, for example, for use in
-Leakage aerosol
-Downstream oil mist of the compressor
-Cooling lubricant for machine tools
-Aerosol with minimal lubrication

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