manufacturer :       Merck-Hitachi

model :                   L-4000

annotation :           Dokumente engl.

The light beam emitted from the light source (D2 or W lamp) reflects on the condens-ing mirror Ml, passes through slit S1 and is dispersed by the stigmatic concave grat-ing Gl.

It is split into two beams by the half mirror HM1.

One beam passes through slit S2 and flow cell to reach detector S.

The other beam passes through slit S3 and reaches detector R.

The latter optical signal serves as a reference signal for correcting fluctuations of the light source. Electric signals provided from detectors S and R are converted into absorbance-linear signals by a log amplifier, and output to a recorder and data processor.

Specifications

(1)   Photometric system            Double-beam type (ratio photometric system)

(2)   Light source                         D ₂ lamp

(3)   Wavelength range                195 ~ 380 nm

(4)   Wavelength setting              Manual

(5)   Wavelength accuracy          ±2 nm

(6)   Band width                           10 nm

(7)   Measuring range                  0.001, 0.002, 0.005, 0.01, 0.02, 0.05, 0.1, 0.2, 0.5,

                                                  1.0, 2.5 AUFS

(8)   Response                            Selectable among FAST (0.1 sec), MED (0.5 sec)

                                                  and SLOW (2 sec)

(9)   Noise (peak to peak)            2.5 x 10 ^-5 AU or less

                                                  (250 nm, air in cell, response MED)

(10) Drift                                     5 x 10- ⁴ AU/hour or less

                                                  (250 nm, air in cell, response MED)

(11) Auto zero

      1) Zero adjustable range      2.0 AU or less

      2) Reproducibility of

          zero adjustment               Within -±1 % of full scale

(12) Offset                                  +0.1 AU, ON/OFF setting from operation panel

(13) Input signal

      1) Auto zero (contact closure of ≥ 0.1 second)

      2) Marker (contact closure of ≥ 0.1 second)

(14) Output signal

      1) Recorder                          10 mV full scale

      2) Data processor                1 V/AU, 0.4 V/AU

      3) Lamp error (contact closure)

(15) Capacity and withstand pressure of flow cell

      1) 11.3 µl (optical path length 5 mm)                   Standard cell

      2) 2.4 µl (optical path length 3 mm)                     Semi-micro cell

      3) Withstand pressure                                        Less than 10 bar

(16) Operating

      temperature range               15 to 35°C

(17) Relative humidity                45 to 85 %

(18) Power reciuirements          100 to 115 V, or 220 to 240 V AC, 50/60 Hz

(19) Dime nsions                        260 (W) x 435 (D) x 150 (H) mm

(20) Weight                                Approx. 14 kg

(21) Power consumption           Approx. 150 VA