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CORROSION MITIGATION INSTRUMENTATION
P. O. B
1667 S
B
, C
92402
T
: (909) 890-0700
F
: (909) 890-0736
OX
AN
ERNARDINO
A
EL
AX
P
I
RODUCT
NSTRUCTIONS
MODEL M/1
WET SPONGE HOLIDAY DETECTOR
DESCRIPTION
The Model M/1 Holiday Detector is a highly sensitive device designed to locate holidays (pin
holes, voids, etc.) in thin film protective coating of relatively high electrical resistance when such
films are applied to the surface of material of low electrical resistance. In these applications, such
as painted metal surfaces, the Model M/1 Holiday Detector will locate these points very
accurately with an audible signal. This method of inspection of thin film is a non-destructive test
and will not injure the protective coating.
EQUIPMENT
The Model M/1 Holiday Detector consists of a portable battery powered electronic instrument, a
non-conductive handle w/sponge clamps, open cell sponge (cellulose) and ground wire. The
instrument is housed in a sturdy plastic case with provision for attachment to the operators belt.
The detector is a "non-destructive wet sponge" type holiday detector. The basic electronic design
of the Model M/1 Holiday Detector is that of a very sensitive circuit which is energized by six "AA"
batteries. When current of 500 or 700 (+/- 10/%) micro-amperes flows in the circuit, an audible
signal is actuated.
The test lead wire used in the wand handle and ground wire is capable of handling a minimum of
100 milliamps at 100 volts. If replacement or additional wire is needed, make sure it meets these
requirements. Length of ground wire does not adversely effect the detectors operation.
The exploring electrode is open-cell sponge material and is conductive when saturated with a
wetting solution.
The sponge electrode is attached to the non-conductive wand handle by
securing it between the metal clamps.
The wetting solution should consist of potable tap water and a wetting agent. The ratio of one (1)
ounce agent to one (1) gallon tap water is recommended. Tinker & Rasor WATER-WETTER© is
a non-sudsing wetting agent, available in 8 oz. bottles, factory direct or through stocking
distributors.
RECOMMENDED TESTING PROCEDURES
PRE-ELECTRICAL TEST PROCEDURES
The protective coatings should be dry and free of all contamination prior to electrical holiday
testing. Proper curing and drying time of the protective coating must be established prior to
conducting electrical holiday testing.
Note:
Solvents retained in the protective coating film can cause erroneous indications (false
holidays) during electrical testing.
Web: www.tinker-rasor.com
E-mail: Info@tinker-rasor.com
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Summary of Contents for Tinker&Rasor M/1
- Page 1 The detector is a “non-destructive wet sponge” type holiday detector. The basic electronic design of the Model M/1 Holiday Detector is that of a very sensitive circuit which is energized by six “AA” batteries. When current of 500 or 700 (+/- 10/%) micro-amperes flows in the circuit, an audible signal is actuated.
- Page 2 CALIBRATION Factory calibration on Model M/1 Holiday Detectors are set at 700 micro-amperes (+/- 10) of current flow to complete the circuit for the audible signal to indicate a coating holiday on metal substrates.
- Page 3 NSTRUCTIONS ADJUSTMENT OF SIGNAL SYSTEM Model M/1 Holiday Detectors with mechanical relays, the sensitivity may be changed by adjustment of the armature contacts. The signal sensitivity is determined by the setting of the electronic relay. Turning the adjusting screw of the potentiometer clockwise REDUCES the sensitivity and turning counterclockwise INCREASES the sensitivity.
- Page 4 ERNARDINO RODUCT NSTRUCTIONS MODEL M/1 INFORMATION BULLETIN The electrical holiday detector commonly used for inspection for brushed, sprayed or dip-applied protective coatings is considered a non-destructive device with a source of less than 75 volts applied to the coatings using an electrode consisting of a cellulose sponge dampened with an electrically conductive liquid such as tap water.
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