Technical Specifications


1, 0.1, 0.01, 0.001 fringes, equivalent to Refractive Index 1 x 10-6, 1 x 10-7, 1 x 10-8, 1 x 10-9. Switchable noise reduction filter on displayed result that shows average reading if result is unstable
±2.09715175 Refractive Index equivalent to ±2097151 fringes
Liquid Crystal Display showing the following: Fringe count, differential refractive index, at least 50 gas concentration scales. The display also indicates if any fringes have been missed (error detection), available menus and other advice and information as required.
16 keys: 0-9, Minus, Dot, Scroll, Print, Enter, Zero
Two RS 232 full duplex serial ports: Port 1-printer, Port-2 PC
A user entered serial number can be output along with the results
Optical unit: precision aluminium casting
Counter: desktop console with membrane keypad.
Optical unit: width 775mm x depth 385mm x height 165mm Counter: width 290mm x depth 200mm x height 130mm (rear) 60mm (front)
110 or 230 V AC, 50 or 60 Hz

Product Information

The GR1 Gas Laser Refractometer is a high accuracy optical interferometer which counts the number of fringes that are created by the change in optical path length through the sample cell as the refractive index of the gas within it changes.

The GR1 has its own special counting unit (ICF 1/1000) to carry out this exacting task. The unit displays and outputs the results in terms of fringe count, refractive index (RI) or, if the appropriate scaling factors are entered, gas concentration.

At the heart of the GR1 lies a special type of self-compensating Jamin interferometer. This ensures that besides being an extremely sensitive instrument, it is also ultra-stable. The GR1 incorporates a patented operating system, developed by the UK National Physical Laboratory (NPL) and manufactured by Index Instruments under licence from the British Technology Group (BTG). The entire system is engineered into a high quality, robust, main frame, designed to withstand the rigours of an industrial environment. It is therefore equally at home in both a research and manufacturing quality control situation.