 The Tinker & Rasor
Model M1/AC Holiday Detector is a highly sensitive electrical instrument,
designed to locate holidays (pin holes, voids, etc.) in thin film coatings of relatively
high electrical resistance when such films are brushed or sprayed to the surface of
material of low electrical resistance. In these applications, such as painted metal
surfaces, the M1/AC Detector will locate these points very accurately. This method of
electrical inspection of thin film is considered a non-destructive test with an applied
voltage of 67.5 volts DC to the coated surface.The
Model M1/AC Detector was designed to inspect thin film coatings from 1 to 10 mil
using ordinary tap water. The cellulose sponge electrode, when dampened with water is
moved over the coated surface. When the electrode passes a void or bare spot a small
current flows and actuates an audible signal. The M1/AC Detector is
effective on films to 20 mils if a wetting agent is used with the water. Non-sudsing type
wetting agents similar to those used in developing photographic film are recommended.
The detector operates from 110/120 VAC, 56/60 Hz line
current, and the electrical design of the M1/AC Detector utilizes a very
sensitive relay which is activated by a voltage regulated, solid state power supply. When
a current of approximately 750 microamps flows through the system, the relay closes and
actuates a signal bell.
Features
- Regulated inspection voltage
- Instant calibration verification
- Non-destructive detector metal case
- Low applied voltage of only 67.5 volts to coated surface.
Specifications
Model M1/AC Detector Complete consists of:
- Detector Unit. Input 110/120 VAC, 50/60 Hz. Output 67.5 VDC.
- Wand with 18" phenolic handle, clamp and 15-foot cable.
Longer wand handle or cable available at extra cost.
- Cellulose sponge electrode 2" x 2" x 7".
- Ground wire, 15-foot cable with clamp.
- Set of operating instructions.
Shipping
- Domestic shipping weight approximately 8 lbs (3.6 kg).
- Export shipping weight approximately 15 lbs (6.8 kg).
- Shipping box, domestic (L x W x H): 19" x 18" x
13" (48 x 46 x 33 cm).
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