Mettler Toledo - Mettler Toledo DP550 Mode D'emploi

5. Malfunctions and possible causes
No signal:
Signal fluctuations:
6. Technical specifications
Measuring principle:
Light path in sampler:
Light wavelength:
Spectral bandwidth:
Ambient conditions:
Maximum sample temperature: 75 °C
Measuring range:
Measuring accuracy:
Stability:
Signal output:
Time constant:
Probe material:
Power supply:
Weight:
– Mirror (4) or window (3) is dirty.
– Unscrew mirror assembly, connect
Phototrode to power supply and check whether
the light is coming through the window (3). If no
light is visible, send the phototrode along with
the power unit to the nearest
Service facility.
– These can be caused by air bubbles or solid par-
ticles in the sample solution. Vary the stirrer speed
until the air bubbles disappear.
Single-beam measuring process;
chopper-modulated
2 cm
DP550: λ = 555 nm; DP660: λ = 660 nm
Approx. 30 nm (at 50% relative intensity)
Temperature 15° C...35 ° C
Maximum relative atmospheric humidity up to 80%
0...100 % transmittance
Better than 1.5% transmittance
After 30 min, warm-up time: ≤ 0.5% transmit-
tance/10 min, (at constant ambient temp.)
100 % transmittance = 1000 mV DC
0.7 s typically
Polypropylene and glass
29 V DC/70 mA from standard equipment power
unit
Approx. 250 g (not including power unit)

METTLER TOLEDO