Automatic Microscale Vapor Pressure Analyzer

Description

The design of the K24870 Microscale Vapor Pressure Analyzer is based on the Triple-Expansion Principal for vapor pressure determination. The sample of known volume is injected into a temperature controlled measuring chamber with a piston in it, which is then sealed. The volume of the sample is expanded by X times in three steps. The total pressure after every expansion step is measured and the dissolved partial pressure of the air and dissolved partial pressure of air in the sample are calculated. The temperature is then raised to a certain value and the total pressure is measured at the temperature. By taking the difference of the total pressure after final expansion and the partial pressure from dissolved air, the vapor pressure of the sample is calculated.

TEST METHOD:

ASTM D5191: Determines the total vapor pressure exerted in vacuum by air-containing, volatile, liquid petroleum products, including automotive spark-ignition fuels with or without oxygenates. This test method is suitable for testing samples with boiling points above 0 C (32 F) that exert a vapor pressure between 7 kPa and 130 kPa (1.0 psi and 18.6 psi) at 37.8 C (100 F) at a vapor-to-liquid ratio of 4:1. Measurements are made on liquid sample sizes in the range from 1 mL to 10 mL. No account is made for dissolved water in the sample. ASTM D6378: Determines the vapor pressure exerted in vacuum by volatile, liquid petroleum products, hydrocarbons, and hydrocarbon-oxygenate mixtures. This test method is suitable for testing samples with boiling points above 0 C (32 F) that exert a vapor pressure between 7 kPa and 150 kPa (1.0 psi and 21 psi) at 37.8 C (100 F) at a vapor-to-liquid ratio of 4:1. The liquid sample volume size required for analysis is dependent upon the vapor-to-liquid ratio chosen and the measuring chamber volume capacity of the instrument.

FEATURES:

Fully Automatic

Measuring method is selected and the corresponding result will appear on the screen upon completion

Small Sample Size

Required amount of sample for each test is 1 mL

2.5 mL of sample is needed for each rinse to avoid contamination (3x rinse per cycle)

Industrial Touch Screen User Interface

7-Inch Integrated Color Touch Screen

Built-in standard test methods

USB and Network Connections

RS232 interface for connection to thermal printer

USB interface for connection with mouse or storage device

Internet (Ethernet) connection

Software Capabilities

Standard test methods are preprogrammed or user-defines test programs can be created

Results will automatically appear on the screen after completion of the test

Ability to measure multiple temperature points in steps as low as 0.1 C and up to 100 points

Built-in storage of up to 1,000 test results.