DeFelsko PosiTest High voltage Holiday Detector Manuale utente
Instruction Manual v. 1.0
High voltage Holiday Detector
Introduction
1
The PosiTest High voltage Holiday Detector (HHD) is a Pulse
Type DC Holiday Detector designed to locate small defects and
discontinuities (called “pinholes” or “holidays”) in a protective
coating system applied to a conductive substrate. High voltage
holiday detectors are commonly used to inspect non-conductive
coatings thicker than 500 µm (20 mils).
Designed for maximum versatility, the
PosiTest HHD
can be used
in either a stick-type or wand-type configuration (when used with the
optional wand accessory). www.defelsko.com/manuals/hhd
The PosiTest HHD has two primary operating modes:
1.Standby Mode: The detector is powered-up but not generating
a high voltage.
2.Detection Mode: The detector is generating a high voltage and
analyzing electrode voltage and current to determine if holidays
are present. Holidays can be detected when the charged
electrode is passed over the coated surface. When a holiday is
encountered, current flows from the electrode into the substrate.
The current returns to the detector through the ground (earth)
wire, completing the circuit and triggering audible and visible
alarms. An integrated peak reading voltmeter measures and
displays the output voltage on the display while in use.
This equipment generates high voltages up
to 35,000V (35kV). Accidental contact with the electrode may result
in an electric shock. Always keep the working end of the electrode
away from your body and never touch it when activated. The
PosiTest HHD operator should exercise all due care to minimize
their risk of electric shock and be aware of all relevant safety
guidelines before using this equipment. When in Detection Mode
(pg. 1) generating high voltage or if an arc is being produced, the
PosiTest HHD will generate broadband Radio requency
emissions. Care must be observed in the vicinity of sensitive
electronics or radio equipment.
2
Operational Safety
De elsko recommends that the operator read and
fully understand this manual prior to using the PosiTest HHD.
IMPORTANT:
WARNING:
or safe PosiTest HHD operation:
DO NOT —
wUse in wet or rainy conditions.
wUse if you are fitted with a pacemaker.
wUse without first connecting the ground (earth) cable.
wTouch or allow anyone else to touch the object being tested.
!
DO —
wEnsure that all connections are secure and tight.
wWear appropriate gloves and footwear
wUse flagging tape and signage to keep other personnel away
from the testing area.
wCommunicate the hazards associated with holiday testing with
all personnel on-site via tailgate meetings or ield Level
Hazard Assessments.
wPower O the detector before touching the spring or brush.
wConfirm the testing voltage requirements and ensure this is
communicated to all personnel involved or working in the area.
3
The PosiTest HHD Kit contains the following materials.
APosiTest HHD
B 50 cm (20”) Extension Rod & Thumb Screw
C Stainless Steel an Brush
D 7.6 m (25’) Ground (earth) cable with Ground Clip
E Shoulder Strap
Li-ion Battery Pack with built-in charge state indicator
G Smart Battery charger with universal AC voltage input
H Pelican Storm Case [accommodates rolling spring electrode
for inspecting pipes up to 64 cm OD (25”) and brushes up to
90 cm (36”)]
PosiTest HHD Kit
A variety of optional and replacement accessories are available to
help you get the most out of your PosiTest HHD.
See www.defelsko.com/hhd to learn more.
Accessories
AD
E
CB
H
G
4
PosiTest HHD Overview
Speaker
Strobe alert
LCD display
Control panel
Madein USA
Li-Ion Battery
High voltage Holiday Detector
Madein USA
www.defelsko.com
e
a
f
b d
k
g
h
i
j
l
c
Not Shown
Shoulder Strap
Pelican Case
a an brush
bThumb screw
cAnti-rotation tab
dShoulder strap attachment points
eExtension rod
fLock gate for extension rod
gBattery compartment
hBattery
iBattery cover
jSafety trigger
kGround cable socket
lGround cable
5
Quick Start
The PosiTest HHD powers-up when the power button is
pressed. To preserve battery life, it powers-down after
approximately 5 minutes of no activity. Alternatively, select from
the menu for immediate power-down. All settings are retained.
1. Review Operational Safety (pg. 2)
2. Assemble the detector for the application to be tested –
“Assembly Instructions” (pg. 5).
3. Properly ground the instrument – “Grounding” (pg. 6).
4. Set the test voltage – “Adjusting the Test Voltage” (pg. 7).
5. Confirm that the detector is in proper working condition –
“Operational Check” (pg. 6).
6. Perform the test – “Instrument Operation” (pg. 9).
Assembly Instructions
STEP 1. Attach the Extension Rod: Press and hold the lock gate
button while inserting the rod. Ensure the anti-rotation tab on the rod
is aligned with the corresponding receptacle on the PosiTest HHD.
Release the lock gate button and ensure the rod is securely
attached.
STEP 2. Attach the Electrode: Loosen the thumb screw on the free
end of the extension rod, attach the required electrode (or adaptor),
and re-tighten the thumb screw.
STEP 3. Attach the Ground Cable: Align the flat side of the cable
connector pin with the alignment mark in the ground cable socket on
the detector, insert fully and rotate the connector clockwise 180° to
secure the cable. Rotate the cable connector 180° counter-
clockwise to unlock and remove the ground cable. (see
“Grounding”
pg. 6
)
STEP 4. Attach the Shoulder Strap: Clip the strap to the strap
attachment points.
STEP 5. Install the Battery: Loosen the screw on the battery
compartment and remove the cover. Install the battery in the correct
orientation. Replace the cover and secure with the screw.
6
Grounding
Ensure the ground (earth) cable is uncoiled and fully extended.
Connect the ground clip to an exposed (uncoated) area of the part,
or grounding rod. If no ground is available, a trailing ground wire,
grounding collar, or grounding mat may be used. Verify that the
instrument is properly grounded by touching the electrode to the
grounded substrate, ensuring that the audible and visual alerts are
properly triggered.
Never touch the ground cable while the detector is operating.
WARNING:
Operational Check
Prior to each use, the PosiTest HHD should be checked to ensure
it is operating correctly. This operational check ensures that the
audible and visual alerts are operating properly and the instrument
has voltage output. or Calibration and Verification see pg. 10.
Performing an Operational Check
1. Ensure the instrument and all components are assembled.
2. Visually inspect each cable and connection.
3. Press and release the power button on the top of the
PosiTest HHD
.
4. The
PosiTest HHD
should power on and display the test
voltage.
5. Press and hold the button and then activate and hold the
safety trigger on the
PosiTest HHD
to turn on the high voltage
and activate Detection Mode. The button can now be
released.
6.The
PosiTest HHD
should begin testing at the selected voltage.
The display will show the voltage being generated.
7.Touch the electrode to the bare ground wire or grounded
substrate of the part being inspected. Note the audible and
visual alerts. Repeat this step several times.
A spark may or may not be seen and heard. When
using a lower test voltage and on bright sunny days, the spark
may not be seen or heard.
NOTE:
7
8. Release the safety trigger to turn high voltage O and return
the
PosiTest HHD
to Standby Mode.
The
PosiTest HHD
is now ready to use.
Adjusting the Test Voltage
1.With the detector powered ON and in Standby Mode, press
to open the menu and then select the Voltage Set icon .
2.The detector will display the test voltage
3.Use the or buttons to adjust the voltage. The voltage
adjusts in 10V increments between 500V and 1,000V, and in
100V increments between 1kV and 35kV.
4.Select OK with the button to save the voltage and exit.
-
+
The formula and suggestions for setting voltage are
supplied as a guide. Always consult the coating manufacturer for
recommended voltage settings.
NOTE:
The inspection voltage should be obtained from the coating
manufacturer’s specification or by contacting the coating
manufacturer. Based on international standards, formulas and
tables can be used as a guide for setting voltages on various
coating thicknesses. A sample calculation from NACE International
Standard Practice SP0274-2011 is as follows:
The voltage output of the PosiTest HHD is regulated and maintains
the test voltage under normal electrode loading. When in Detection
Mode, the test voltage being generated is displayed on the
PosiTest HHD. Minor fluctuations on the display are normal during
inspection as the PosiTest HHD is regulating the test voltage.
When the electrode is connected to ground, the display will show
“---" indicating that the generated voltage is less than the minimum
of 500V.
V = 1,250 √T (mils)
V = 7,900 √T (mm)
where V = Voltage in volts
T = Thickness of coating
8
Adjustment using the built-in Voltage Calculator
The Voltage Calculator simplifies the task of setting the correct
test voltage for a particular coating system. It prompts the user to
enter the coating thickness on the part to be tested and the
standard the user is conforming to, and automatically calculates
the correct test voltage.
1. With the detector powered ON and in Standby Mode,
press to open the menu then select the Voltage
Calculator icon from the Menu
2. The gage will display a list of common international standards
3. Use the or button to highlight the desired standard
4. Press the button to select the desired standard
5. Depending on the selected standard, a Units Selection menu
may appear. If prompted, select the desired coating thickness
measurement units.
6. A thickness adjustment screen is now shown. Using the or
button, adjust the coating thickness to the maximum thickness
of the coating to be inspected.
Depending on the standard chosen, the range of
selectable coating thicknesses may be limited.
NOTE:
7. Press the button to select the thickness. The PosiTest HHD
will now calculate the test voltage based on the standard and
units selected.
-
+
-
+
10.5 1
The following standards are available when using the Voltage
Calculator:
AS 3894.1: 1, 2, 3, 4
ASTM D4787, D5162, G62
ISO 29601
NACE SP0274, SP0188, SP0490
Voltage adjustments will be retained when the PosiTest
HHD is powered O . Perform a RESET (pg. 11) to return to the
default voltage setting (1kV).
NOTE:
Questo manuale è adatto per i seguenti modelli
1
Indice
Lingue:
Altri manuali DeFelsko Sensore di sicurezza
