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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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