Maintenance
5-12
Part 1120277_01
E 2012 Nordson Corporation
Calibrating the Level Sensors
The melter is shipped with both level sensors calibrated for standard PUR
adhesive. If recalibration becomes necessary, follow this procedure.
1. Operate the melter normally until the reservoir is empty. If the slug in the
hopper is not empty, lift out the solid slug before pumping the adhesive
from the reservoir.
2. Remove all debris or cured adhesive from the sensor probes. Refer to
Cleaning the Reservoir and Level Sensors earlier in this section, then
return here to continue.
3. Ensure that the melter is switched on.
4. SeeFigure5-4.Opentheelectricalenclosureandlocatethetwosensor
amplifiers (items 1 and 2 in Figure 5-4).
WARNING! Risk of equipment damage, personal injury, or death. This
procedure requires you to perform work inside the electrical enclosure with
the power on. Follow electrical safety procedures and observe all
high-voltage indicators.
5. Remove the plugs that cover the sensor adjustment screws.
6. Turn each adjustment screw as follows:
S clockwise until the LED turns yellow,
S counterclockwise until the LED turns green,
S counterclockwise two (2) additional turns
NOTE: When an LED turns yellow, the system believes that adhesive is
present. Because we know that adhesive is not present, turning an
adjustment screw counterclockwiseuntiltheLEDturnsgreenandthen
adding an additional two (2) counterclockwise turns calibrates the
sensors.
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