HVM 472: Multirange Viscometer / Thiết bị đo độ nhớt động học tự động

Many petroleum products, and some non-petroleum materials, are used as lubricants, and the correct operation of the

equipment depends upon the appropriate viscosity of the liquid being used. In addition, the viscosity of many petroleum

fuels is important for the estimation of optimum storage, handling, and operational conditions. Thus, the accurate

determination of viscosity is a very essential characteristic of many product specifications

Designed as a stand-alone instrument that requires no external PC for operation, the Herzog HVM472

Viscometers determines automatically the kinematic viscosity from 0.5 to 5000 mm2

/s while meeting or

exceeding the requirements of ASTM D 445.

SMART BATH DESIGN FOR PRECISE MEASUREMENT UNDER ULTRA STABLE CONDITIONS

To ensure accurate analysis under ultra-stable conditions, the HVM472 configuration has 2 independent

baths, each equipped with one multi-range capillary (viewable from 180° angle) and superior

microprocessor temperature control and thermal timing systems. The accuracy and uniformity of the bath

temperature, which exceeds the requirements of ASTM D445, is measured with a 0,001°C resolution

control circuit. Three heaters per bath minimize equilibration time when changing to a higher bath

temperature. The bath is designed to automatically compensate for the thermal volume expansion of the

silicone oil from 20° to +150°C. It is also protected against over temperature and low liquid level.

The bath temperature can be calibrated at 10 individual temperature set points (temperatures between

such points are derived by interpolation), within temperature range from +20° to +150°C. From over +40°C

to +150°C, the HVM472 operates without any external cooling (under ambient temperature of 25 °C) and

down to +20°C with the support of an external chiller or fresh water source (thanks to the built-in cooling

coil). When equipped with the Cooling Control System (option), the system will automatically reduce the

flow from an external chiller when full cooling capacity is not necessary.

CONTINUOUS AND USER-FRIENDLY OPERATION THROUGH FULL AUTOMATION PROCESSING

Kinematic viscosity determination is very straightforward, using the HVM472: The operator fills the beaker

(20 ml glass or plastic) with sample and places it in the loading position. The system automatically detects

the beaker and prompts the operator to key-in the sample ID, description (optional) and test conditions

parameters (choice to start the measurement immediately OR to place the sample in a queue to be tested

after the previously inserted samples). When the sample is ready to be tested, the HVM472 automatically

delivers it into the capillary by vacuum up to the appropriate level, and then begins the measurement cycle.

After the measurement is done, sample is drained back into the same beaker, test result is displayed and

stored in the internal or optional HLIS results database and cleaning/drying cycle is automatically starts.

Each bath has its own 26 position auto sampler to enable unattended automatic operation of the system.

As the beakers filled with sample is inserted one by one into the auto sampler tray, the testing starts

according to the entry order. After measurement completion, the sample beaker is transported to a tray

where the tested samples remain stored until the operator unloads it. This tray has a capacity of 10 beakers

and is equivalent to testing throughput. Removing finished samples from the tray as they are collected

enables the operator to insert additional new beakers into the auto sampler thus maintaining continuous

operation of the HVM472 beyond the initial 26 samples that were inserted.

FLEXIBLE CONFIGURATION THAT EVOLVES WITH USER TESTING NEEDS

Preheating of samples (Optional) – Prior to being introduced into the capillary, samples may be delivered

to a preheating position (optional sample-preheating block & heated slop assembly) to reduce sample

equilibrium time in the capillary. The preheating option is also useful for samples with high pour point which

needs to be preheated to a fluid temperature prior to being delivered to the capillary for measurement,

therefore preventing from any system plugging.

Sophisticated Cleaning System – The HVM472 is equipped with a sophisticated cleaning system, using

two different solvents to ensure thorough cleaning and complete drying of the capillaries. Should the two

standard solvents not meet the special cleaning requirements of particular samples, two additional solvents

are available as an option. The solvent reservoirs are not pressurized and can be placed up to 5m below

and 10m away from the HVM472. A fluid pump transports the solvents from the reservoirs to each capillary

independently. The valve system uses Kalrez® seals that withstand aggressive solvents like Acetone or

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Toluene. When equipped with the special slop sensor (optional), the waste reservoir over filling is prevented

by slop valve switch off. An alarm message then alerts the operator to empty the waste reservoir. All testing

is paused until the alarm is reset.

Multi-Instrument Network through IRIS Software program – As the testing needs are growing, IRIS

Software allows more flexibility in the operation of the HVM472 by enabling easy inter-connection between

several instruments as well as control management via an external PC. Additional Features are also

unlocked under IRIS Software program usage, such as viscosity index calculation, statistical analysis,

automatic specification comparisons, viscosity as function of the temperature, oil blending calculation acc.

ASTM D 341, Hagenbach energy correction, optimization of throughput by adjusting the min./ max. flow

time per capillary, calculation of dynamic and relative viscosity (polymer industry), K- value and viscosity

number, measurement programs specific to test materials and or reference materials, calibration and test

verification history, multi-level security protection, diagnostic and one central results database.

Methods

ASTM D 445, D446 per section 1.3, IP 71 Section 1, ISO 3104 and EN ISO 3104.

Main Features

• Two bathes with independent sample changers, for continuous and unattended operation

• Viscosity Index determination