The model FWT-92D reader is a dual wavelength photometer for readout of the FWT Radiachromic Dosimeters. The LED digital display reads directly in Optical Density (OD). The two wavelengths 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 1/2 “ digital display shows the Optical density to 2 or 3 decimal places.

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

Options include an RS232 output for computer interface and a set of neutral density filters for checking the operation of the instrument.

Specifications
 OD Range: 0.001 to 1.999, 2.00 to 3.00.
 Internal Controls: None
 External Controls: Zero (HI) and Gain (LO) adjustments.
 Wavelength Select: 510 or 600 nm.
 Warm Up Time: 20 minutes
 Drift: ± 0.005 OD/hr near 0 OD
 Photometric Precision: ±0.003 OD @ 0.000 to 1.000 OD; ± 1% of reading @ 1.000 to 1.999 OD; ± 2% of reading @ 2.00 to 3.00 OD
 Filter Wavelength: ± 2 nm
 Filter Bandwidth:510 nm: 7.7 nm ± 1.5 nm; 600 nm: 10.1 nm ± 1.5 nm
 Lamp life: 8,000 hours
 Power Requirements: 110 VAC 60HZ
 Size: 31W x 23D x 17H cm (12 x 9 x 7 “)