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Idiomas disponibles
Idiomas disponibles
1. General information
The photoelectric probe "DP550 Phototrode" operates with green light (555 nm),
and the "DP660 Phototrode" operates with red light (660 nm). The output signal is
1 V at 100% transmittance. The high-frequency light modulation permits significant
suppression of external disturbances caused by sunlight or artificial light. Quite aside
from their different designations, the only difference in their external appearance is
a red (DP660) or a green (DP550) cap on the adjustment knob.
2. Setting up the instrument
– Plug power unit (10 or 11) into an outlet (230 V European plug; 120 V USA plug).
– Insert the small black plug (9) from the power supply cable into the socket of the
power unit.
– Connect the signal cable (6, 7 or 8) to the titrator.
3. Adjustment
– Connect the Phototrode as described in Paragraph 2.
– Dip the probe into water or in the solvent to be used.
– Lightly depress the adjustment knob (1) and turn it until it snaps into position.
– Adjust the output potential to 1000 ±5 mV (100% transmittance) by turning the
knob which has been snapped in place.
– For precise measurements, it is recommended that the warm-up time of 30 min.
be observed.
4. Maintenance
Make absolutely sure that the mirror (4) and the window (3) are always clean. It is
best to clean them with a cotton swab. The probe is resistent to most acids and
solvents. Make sure that the probe is rinsed thoroughly with water after use, espe-
cially if alkaline mixtures which contain chloroform are used. If there is any dulling of
the mirror, the mirror assembly (5) can be replaced easily (Order No. 22684).
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