Firma:              Beckman

Modell:                         UV-24

Kommentar:     Dokumente engl.

These devices are intended for use by operators experienced with the methodology, during those parts of in vitro diag­nostic enzymatic or quantitative or qualitative analysis pro­cedures which require measurement of light transmission through reagents at wavelengths in the visible and ultraviolet regions of the electromagnetic spectrum.

The Model 24 is capable of measuring light at wavelengths from 340 to 700 nanometers (190 to 700 nanometers with optional deuterium source).

The Model 24 Spectrophotometer are double­-beam, digital-reading or recording instruments which can make absorbance, concentration, percent transmission and differential absorbance measurements. Quantitative and qualitative analysis and reaction-rate studies are easily ac­complished. Specialized techniques such as automatic sam­pling and batch sampling, are possible with addition of easily mounted accessories.

The Model 24 Spectrophotometer is housed in a compact case with front and rear panel controls, and a four-digit display. Major design features of the instrument include: one source (tungsten), monochromator, detector, large sample compartment, fixed slit, solid-state circuitry, a fixed aperture, 340 to 700-nanometer operating range, and readout in ab­sorbance, concentration, and differential absorbance modes.

Specifications

MONOCHROMATOR

Single monochromator, filter-grating, 1200 lines/mm and blazed    at 250 nm.

OPTICAL PRINCIPLE

Double-beam and single-beam.

WAVELENGTH RANGE

Model 24 Spectrophotometer: 340 to 700 nm.

WAVELENGTH PRESENTATION

Linear, digital counter.

WAVELENGTH ACCURACY

±0.5 nm.

WAVELENGTH REPEATABILITY

Better than 0.20 nm.

STRAY LIGHT

Model 24 Spectrophotometer: less than 0.1 % at 370 nm.

RESOLUTION

Model 24 Spectrophotometer: 4 nm.

SLITS

Model 24 Spectrophotometer: Fixed, 0.8 mm.

PHOTOMETRIC READOUT

Digital Display

Four-digit digital display, 0 to 2 A, or 0 to 8000 counts in concentration. In addition, 0 to 200%T an the Model 26.

Recorder

100-millivolts per absorbance unit or 100 millivolts per 100%T on the Model 26.

Differential

-0.3 A to +0.7 A with 1 A Pushbutton depressed (on Models 24 and 25).

BCD Connector

0 to 2 A or 0 to 8000 counts in concentration through 36-pin connector.

BCD OUTPUT

16-line BCD

-10 to + 8000 counts.

BCD PRINT OUTPUT

A positive true-open collector pulse, 20 microseconds wide, occurs 6 seconds after completion of sipper fill time.

DATA READY OUTPUT

0.5-millisecond positive pulse indicating data will remain valid for 0.25-second. Occurs approximately one-third of a second after receiving a convert input.

CONVERT INPUT

A ground true pulse of at least 50-microseconds duration. A new update is initiated on trailing edge of pulse.

BCD DISPLAY HOLD INPUT

A false logic level or a ground will inhibit the updating of the output register while data are being taken. This signal should be used only if data are being taken asynchronously.

PHOTOMETRIC ACCURACY

0.5% of reading or 0.001 A, whichever is larger.

PHOTOMETRIC REPEATABILITY

0.25% of reading or 0.001 A, whichever is larger.

RECORDER SCALES

0.1 A, 0.25 A, 0.5 A, 1.0 A, and 2.0 A fullscale; and 10%, 25%, 50%. 100% and 200%T fullscale on Model 26.

SCANNING SPEEDS

100, 50, 20, and 5 nm/min selectable on accessory recorder unit.

CHART SPEEDS

.1, .2, .5, 1, 2, 5, and 10 in/min.

0 A LINE

±0.009 A maximum deviation (including noise) from 200 to 700 nm.

BASELINE STABILITY

Double-beam better than 0.0004 A per hour at zero A.

APPROXIMATE WEIGHT

Normal: 70 pounds net.

Shipping: 85 pounds.

OVERALL DIMENSIONS

24 inches long x 16 inches deep x 14 inches high.

POWER REQUIREMENTS

120/240 volts (±10%), 50/60 Hz. Two amperes at 120 volts and one ampere at 240 volts.