| 1.
HOLIDAY DETECTOR FUNCTION
The Tinker & Rasor Model AP Voltage
Regulated Holiday is a portable, all-purpose electrical inspection instrument
which maintains a given inspection voltage in spite of the electrical load
on the circuit or the charge on the battery. It is recommended for use
on any pipe diameter as well as on flat surfaces when such surfaces are
coated with a highly electrical resistance material, and when the surface
beneath the coating is electrically conductive. The detector works equally
well on damp or dry surfaces, and is especially desirable where humid conditions
prevail.
2.
UNPACKING & INSPECTION
A. Open the carrying case and make note
of where the various accessories are located. To
ensure proper
storage, repack accessories in the same manner when not in use.
B. Inspection should be made upon receipt.
If damage has occurred during shipment, file a
claim with the
carrier immediately.
C. If it is necessary to contact your supplier
or the manufacturer concerning damaged or
missing items,
be sure to include the serial number, purchase order number, and invoice
number of the
instrument in question.
3.
CHECK-OUT INSTRUCTIONS
A. Remove all accessories from the carrying
case with the exception of the battery charger.
(The instrument
is shipped with two batteries, one of which us already in the unit).
B. Make sure that the detector is turned
OFF.
C. Using the VOLTAGE SELECTION TABLE on
the back panel, select the specific voltage
required Unscrew
the protective cap on the SELECTOR and use a screwdriver to turn the
switch to the
HI or LO position. Replace black plastic cap cover. Use same procedure
to
adjust voltage
settings.
CAUTION:
Always
change HI-LO switch with detector turned OFF.
D. Connect high voltage cable and ground
cable to detector (insert and twist clockwise).
E. Attach probe handle to voltage cable.
F. Attach electrode to the voltage probe
assembly and apply to the structure to be inspected.
The electrode
should always make intimate contact with the surface under inspection.
G. The Model AP Holiday Detector is now
ready to operate.
4.
OPERATING METHODS
A good ground return system for both the
pipe and the detector will always provide the best and most reliable inspection.
The pipe to be inspected must be grounded from the bare pipe to earth at
some point along the pipe. If individual joints of the pipe are to be inspected
that are not electrically connected, each joint must be grounded.
The speed of the electrodes travel along
the pipe should never be excessive, since faulty inspection may result.
Occasional checks of the detector operation should be made, particularly
if no holidays are being found. this can be accomplished by testing for
the spark and signal at the edge of the coating where bare pipe exists,
or by touching the probe end to the bare pipe and noting the length of
the spark and the signal effectiveness.
If the signal does not occur when the spark
discharges from the electrode into a known holiday, the ground return (i.e.
the path between the metallic pipe and earth and the earth to the ground
trail of the detector) is of high resistance. In this case, a better ground
is required and a direct connection between the metal pipe and the ground
wire may be necessary. This type of grounding is extremely uncommon unless
the soil is very dry of the detectors output is low.
Correct voltage output for a given thickness
of coating has long been a matter of controversy. However, recent formulas
have been suggested which may be used as a guide for correct peak voltages
on various coating thickness. the calculation is as follows:
V = K√ T WHERE
V = Peak voltage in volts.
√T = Squareroot of the Thickness of bonded coating in mils
(not including outer wrappers). K = Constant of 1,250 for coatings over
30 mils and 525 for fusion bonded epoxy coatings.
These formulas when applied to a coating
of 3/32" thickness and with a constant of 1,250 would indicate an applied
voltage of 12,500 volts peak or a coating of 16 mil thickness and with
a constant of 525 would indicate an applied voltage of 2,100 volts peak.
A common practice used in setting inspection voltages in the field I s
to adjust the output voltage by visual observation. It is the general consensus
that spark discharge at least twice the thickness of the coating will give
adequate inspection.
Consult the coating
manufacturer for recommended voltage applications.
5.
INSTRUMENT SERVICING INSTRUCTIONS
A. Cleaning
Keep the instrument
clean and dry. Clean the instrument case with a soft cloth
dampened with
kerosene, then wipe dry. Do not use solvents such as lacquer thinner,
methyl ethyl
keytone, etc. KEEP ALL ELECTRICAL CONTACTS CLEAN.
B. Voltage Output Checks
1. In case of
LOW output voltage:
a. Check position of voltage selector switches.
b. Check battery (is it fully charged?).
c. Check for "parted conductor in voltage probe and/or ground trail.
2. In case of
NO output voltage:
a. Check battery.
b. Check for "parted" conductor in voltage probe and/or ground trail.
c. Check battery contacts, MAKE SURE THEY ARE CLEAN.
6.
BATTERY CHARGING INSTRUCTIONS
A. Use ONLY the battery charger provided.
B. Charge battery nightly after use.
C. To charge battery in the instrument.
a. Connect plug
of the battery charger to jack on battery through access door.
b. Plug AC power
cord into proper outlet.
D. Charger indicator light is on during
charging. It will begin to flash on and off when battery is
fully charged.
E. To charge battery OUTSIDE the instrument:
a. Remove battery
through battery access door.
b. Connect battery
charger plug to battery jack and follow step C above.
F. Charge battery at temperatures above
45 degrees for best results.
G. Always disconnect charger from battery
and AC outlet when not in use.
7.
BATTERY MAINTENANCE INFORMATION
A. When instrument fails to operate normally
the battery may be fully discharged. Recharging
battery nightly
will extend battery life.
B. Store at room temperature 68 degrees
F (20 degrees C) or below when not in use.
Note:
Do not store battery in discharged state. Recharge every 30 days, if not
in use.
8.
SHIPPING INSTRUCTIONS
All instruments being returned for repair
should be sent PREPAID to either address below:
Tinker & Rasor
417 Agostino Road
P.O. Box 281
San Gabriel, CA 91778
Include with shipment information the nature
of the problem, purchase order, serial number and return delivery address.
Immediate
service is guaranteed! |