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ANALOG RADIACHROMIC READER
MODEL FWT-91R
(THIS READER HAS BEEN DISCONTINUED - ONLY SERVICING OF UNITS MAY STILL BE AVAILABLE)

The model FWT-91R reader is a dual wavelength photometer for readout of the FWT Radiachromic dosimeters. The meter reads directly in Optical Density (OD) or percent transmission. The two wavelengths available are 510 nm and 600 nm and are used to cover the range of the Radiachromic Dosimeters.

The instrument is simple to use. The front panel controls are used to setup the instrument for operation. The wavelength is selected from the front panel switch and the dosimeter is placed in the holder and lowered into the well. The x10 switch increases the sensitivity for reading high OD dosimeters.


The instrument uses bandpass filters, which have excellent long term stability, for wavelength selection. The lamp has a long life and is easily replaced.

  Specifications
Range:0.01 to 1.00 OD 1.00 to 2.00 OD using the X10 switch 0-100% transmission
External Controls: Power On/off, Wavelength selection, X 10 button, 0%T and 100%T adjustments.
Wavelength Selections: 510 or 600 nm.
Meter and Scale: 4" Meter W/ 0-2 OD log scale, 0-100%T
Warm Up Time: 10 minutes
Drift: ± 0.02 OD/hr near 0 OD
Photometric Precision: ± 3% transmission full scale
Filter Wavelength: ± 2 nm
Filter Bandwidth:510 nm: 7.7 nm ± 1.5 nm; 600 nm: 10.1nm ± 1.5 nm
Lamp life: 8,000 hours
Power Requirements: 110 VAC 60HZ
Size: 25 W x18 D x 18 H cm (10 x 7 x 7 in)

  Options
Neutral Density Filter Set: FWT-82S (standard); FWT-82C (Certified)
220V 50Hz Operation (Model FWT-91R-220)
Alternate wavelengths available.
Please consult the factory for other changes or modifications.

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Specifications subject to change without notice.
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