Normalab NAE 440 Automatic Aniline Point Tester

Aniline point testing with two independent dry-bath stations

The NAE 440 is Normalab’s automatic aniline point tester. Equal volumes of aniline and sample are mixed in a U-tube and heated until they become one clear phase, then cooled until the mixture turns cloudy again; the temperature at which that happens is the aniline point. A low aniline point indicates a highly aromatic product, so the test is used for solvents, fuels and rubber process oils to judge aromatic content and solvent power.

Normalab lists ASTM D611, ISO 2977 (method 5), ISO 21493:2019 and IP 2 and related methods. They cover the aniline point of petroleum products and hydrocarbon solvents, and the mixed aniline point of those having aniline points below the temperature at which aniline crystallizes from the aniline-sample mixture.

Technical specifications

Delivery, options and operation

The NAE 440 is delivered ready to use with two U-tubes (P/N 40546) and two probes (P/N 40536). Options listed are a cryostat from -15 to 60 °C with a 5 litre volume and lid (cryostat on request), an insulated tubing set for connecting it, a Dispensette S Organic digital dispenser of 1 to 10 ml in 0.05 ml steps, a thermal printer, a printer cable and printer paper in a 10-spool pack for the 440 range.

The dry bath removes the liquid bath used in older manual apparatus, and each station runs independently, so two samples can be started at different times. Automatic detection of the clouding point removes the need for the operator to watch the tube, and visual checking is still possible when a sample is difficult.

What to confirm before ordering

Aniline is toxic, so plan a ventilated bench, waste handling and the dispenser for measuring aniline and sample accurately. Because low-temperature tests need cooling below ambient, confirm whether a cryostat and insulated tubing are needed; the web page and leaflet state the lower temperature limit differently, so state your required range in the enquiry.

A product that is very dark or highly viscous may need the mixed aniline point approach or a different dilution, as set out in the standard. Results should be repeated according to the repeatability limits in the method. Also confirm the standard, the dispenser, printer, spare U-tubes and probes, and the 230 V supply. Related equipment is grouped under liquid analytical systems.

Documents and quotation

The Normalab NAE 440 leaflet is attached. Send the products tested, temperature range and options for a quotation; availability and lead time are confirmed before ordering.