Thermo Scientific APEX 100 User Manual page 295

Electrical Interference
It is always good practice to suppress electrical interference at its source and, if trouble
is experienced, the offending source should be located and suppressed. If this is not
possible, it may be necessary to operate the APEX at a reduced sensitivity.
A relay in the metal detector is often used to control solenoid valves, power contractors,
and similar electrical devices. When these devices are switched off, the collapsing field of
the winding generates a wide- band interference, which may be picked up by the search
coils in the detector head and cause false triggering.
A capacitor of suitable capacity and working voltage connected across the offending
device and grounded as close to the device as possible will often provide satisfactory
suppression.
Pneumatic Air
Connect incoming air to the detector's air-regulator fittings using a coiled copper tube or
air hose. Adjust the incoming air pressure to 30–40 PSI (2.1–2.5 kg/cm
devices, or 40–80 PSI (2.8–5.6 kg/cm
Head Balancing
Metal detectors are sensitive instruments and, after they have been shipped or moved,
we recommend the head be re-commissioned by a suitable certified Thermo Fisher
Scientific field-service representative.
Photo-Eye Installation and Connection
A photo eye is used for conveyor systems inspecting discrete products or packages.
Refer to the specific photo-eye installation manual for installation procedures. A photo-
eye is necessary to use the following APEX features.
•
Automatic product tracking
• Reverse detection
• Photo-registered reject timing
Thermo Scientific APEX User's Guide
2
) for air rejects.
2
) for pneumatic
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