NDT Italiana S291 Electronic Photofluorometer

NDT Italiana S291 Electronic Photofluorometer

NDT ITaliana S291
Electronic Photofluorometer

S291 Photofluorometer

The S291 Electronic Photofluorometer is specially designed to carry out fluorescence measurements faster, easier, and with higher accuracy. It has unique features like the zero and calibration adjustment with fine sensitivity potentiometer and digital display.

The S291 can also be used for ultraviolet and thermal stability tests on liquid penetrants. It can be used to measure the fluorescence of fluorescent and dual colored magnetic powders.

Measure of fluorescent brightness of penetrants as required by AMS 2644 (replacing MIL-I-25135), ASTM E-1417 (replacing MIL-STD-6866), EN ISO 3452-2. The NDT S291 is listed in ASTM E-1135 and completely meets the EN 571-2.


  • Sample Holder — Designed for insertion in the sample slot on the front of the photofluorometer. The sample holder comes with the instrument.
  • Primary Light Filter — The primary light source filter for the S291 photofluorometer is an integrally filtered long-wave 4-W lamp.
  • Secondary Light Filters — The S291 uses an OGR green and OB14 blue glass filter that is pre-installed.
  • All filters are installed by the manufacturer, so the instrument is ready for use.

    1. Turn on the instrument and allow a 10 to 15 minute warm up
    2. Compare the prepared papers under the black light and choose one of the brightest papers to set the instrument.
    3. Place the chosen paper in the sample holder and insert the holder into the sample port of the photofluorometer.
    4. Adjust the meter response to 80 by turning the “CAL” adjustment knob.
    5. Remove the sample holder and replace the fluorescent paper with an untreated blank paper and re-insert into the instrument
    6. Adjust the meter response to 00 by turning the “Zero” adjustment knob.
    7. Remove the blank paper and insert the prepared sample for measurement. Alternate samples of test and standard material to minimize effect of any instrument drift that might occur.

    calculation tab

    Calculate the fluorescence of the test material as a percentage of that, of the standard material by the formula.

    X/S × 100

    X = the average of the test material reading
    S = the average of the standard material reading

    specifications tab

    Digital Display LED 000 ÷ 999
    Drift Negligible
    Lamp UV Lamp 4 Watt 365 nanometers
    Primary and Secondary Filters In accordance with specifications
    Zero and Calibration FIne potentiometers continuously adjustable (10 turns)
    Power Supply 220V/50Hz, 30VA (117V/60Hz)
    Dimensions 260 x 210 x 130mm
    Weight 6.6lbs (3kg)
    Reflectance Sample Holder In accordance with specifications

    Product Literature

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