DeFelsko PosiTector SST User manual
Soluble Salt Tester
Innovative
PosiPatchTM
For use with all
Bresle patch types
including the
Instruction Manual
The Bresle ethod DeFelsko Patch is low cost,
latex-free, and works on nearly any surface
geometry or material. It features a low-tack
adhesive which creates a tight seal while
remaining easy to remove without leaving behind
any foam residue.
The Bresle ethod DeFelsko PosiPatch further
simplifies the Bresle method. It requires no
adhesive, as it is held to a steel surface by a
magnetic holding ring. It has a built-in port which
allows deionized (DI) water to be injected using a
dull polypropylene dispensing tube, eliminating sharp needles
from the test. It features a patented air-permeable membrane,
which automatically releases trapped air as DI water is injected,
then allows air bubbles to return and agitate the surface as
solution is withdrawn. It is also reusable, and a single PosiPatch
can be used for multiple tests.
The PosiTector SST can be used as a conventional conductivity
meter making it ideal for testing abrasive materials in accordance
with ISO 11127-6 and AST D4940-15. See Bresle Mode (pg.
10).
Recommended: PosiTector SST Video -
www.defelsko.com/sst/video
Introduction
The PosiTector Soluble Salt Tester (SST) is a hand-held
electronic instrument that measures the conductivity of a solution
and calculates the concentration of water-soluble salts on metal
surfaces in accordance with ISO 8502-6 (the Bresle ethod) and
ISO 8502-9. It consists of a PosiTector body (Standard or
Advanced) and an interchangeable probe.
The PosiTector SST is compatible with all Bresle ethod-type
patches including the Bresle ethod DeFelsko PosiPatch, Bresle
ethod DeFelsko Patch and other adhesive patches. While
compatible with any test patch, there are numerous advantages to
the DeFelsko patch solutions.
1
2
Menu Operation
To access the enu, power-up the gage, then press the center
navigation button . Either the keypad or touch screen can be
used to navigate the menu. If desired, touch screen functionality
can be disabled within the Setup menu (See Touch, pg. 10).
Select a menu option by touching it, or use the and but-
tons to highlight the desired option and press to select it.
On menus longer than one page, the current page number is
displayed below the menu name. Navigate between pages using
when the first menu item is selected, or when the last
menu item is selected. If using touch, navigate between pages
by touching or , or by swiping up or down.
Press the button to power up the Gage. To conserve battery
life, the gage will automatically go to sleep after 5 minutes of
inactivity (15 minutes while in Bresle Mode, pg. 10). While in
Sleep Mode, the gage powers up significantly faster— convenient
when moving between parts or locations. The gage will completely
power off after 4 hours of inactivity. Alternatively, select Power Off
from the main menu. All settings are retained.
Quick Start
When a enu option is highlighted, the
icon indicates on-gage help is available.
Press or touch the icon to display the
help. A formatted PDF containing all on-
gage help items is available at
www.defelsko.com/help
indicates that a sub-menu exists for the
enu option. Select the option to display its
sub menu.
Update your gage to ensure that you
have the latest on-gage help information.
NOTE:
Press the button or swipe right to return to a previous screen.
Select Exit to close the enu.
When powered-up, the PosiTector automatically
determines which probe is attached and does a self-
check. To disconnect a probe from a body, slide the
plastic probe connector horizontally (in the direction of
the arrow) away from the body. Reverse these steps to
attach a different probe. It is not necessary to power-
down the Gage when switching probes.
Additionally, the PosiTector gage body accepts a wide variety of
probe types including magnetic, eddy-current and ultrasonic
coating thickness, surface profile, environmental, hardness, salt
contamination, and ultrasonic wall thickness probes. See
www.defelsko.com/probes
PosiTector SST probes consist of a purpose-
built test cell, optimized for the range, resolution
and test volume of the Bresle ethod.
Conductivity measurements are compensated
to 25°C (77°F) using a built-in temperature
sensor, and the sample temperature is recorded
for each measurement. The probe can be used
as a conventional conductivity meter by
unchecking Bresle Mode (pg. 10).
3
Test
Cell
How To Measure
Test Preparation:
Use deionized (DI) water to thoroughly clean the PosiTector
SST test cell, test cup, syringe and PosiPatch (if used in test).
All test materials should be handled in a manner that minimizes
the potential for contamination. The PosiTector SST operator
may choose to wear nitrile or other non-contaminating gloves
when performing the test.
Remove the protective cap from the probe. Power-up the Gage
by pressing the button. In the default Bresle Mode, the Gage
guides you through three simple steps - 1, 2 and 3.
Probes
4
Step 2: Prepare Bresle Method Patch
Option A: DeFelsko PosiPatch
a) Turn the PosiPatch and magnetic ring upside down. Place the
PosiPatch into the magnetic ring ensuring the arrows align
with the injection port. Do not touch the PosiPatch’s interior.
b) Carefully place the magnetic ring on the steel surface. When
used on vertical surfaces, position the injection port between
the 4 o’clock and 8 o’clock points before attaching the
magnetic ring to the surface.
c) Slowly inject 3.0 ml of DI water into the port using the plastic
dispensing tip. The air within the PosiPatch automatically
escapes through the air-permeable membrane.
Step 1: Obtain Background (Blank) Conductivity
Measurement (γ1)
The Gage automatically displays the previous
background measurement, if any. This measurement can be
reused and step (c) to step (e) can be skipped by pressing the
button.
a) Pour at least 4 ml (milliliters) of deionized (DI) water into the
supplied cup (to prevent contamination of the water source).
b) Fill the syringe completely with DI water from the cup (slightly
more than 3 ml).
c) Completely fill the PosiTector SST probe’s test cell with water
from the syringe (approximately 1 ml).
d) Wait until the measurement stabilizes (up to 5 seconds), then
press the button to save a new background conductivity
measurement (γ1) and the water temperature (T1).
e) Use the syringe to draw all of the water from the test cell.
Shake any remaining water out of the test cell.
f) With the syringe pointing up, expel the air and excess solution
from the syringe until there is 3.0 ml of DI water remaining.
NOTE:
5
When used on horizontal surfaces, fully insert the dispensing tip
into the PosiPatch. On vertical surfaces, insert the dispensing tip
only as far as is needed to see the tip inside the PosiPatch.
a)
a)
b) c)
b) c)
Option B: Bresle Method DeFelsko Patch (or equivalent)
a) Remove the backing and foam center from the patch, taking
care not to touch the interior surface.
b) Press the patch firmly onto the surface making sure most of
the air escapes.
c) Pierce the top of the patch at the foam perimeter, allowing the
needle to penetrate into the center of the patch.
d) Inject half of the water into the patch. Then, use the syringe to
withdraw trapped air.
e) Remove the needle, point it upwards and expel the air.
f) Re-insert the needle and inject the remaining water into the
patch.
t= test duration
T2= sample temperature
Δγ= The change in conductivity. The
initial background measurement (γ1)
is automatically subtracted from the
final measurement (γ2). Test results
are displayed in units of
microsiemens per centimeter
(conductivity).
ρA=The surface density of soluble
salt expressed as sodium chloride.
Test results are displayed in units of
milligrams per square meter, or
micrograms per square centimeter.
6
Step 3: Begin Test (applies to both patch styles)
a) Once the water is injected into either patch, press the but-
ton to start the test timer.
After starting the test timer, the operator can select Power
Off from the Gage menu to conserve battery life. The test timer
will continue to run and the elapsed test time will be displayed
when the Gage is powered-up.
b) Without removing the needle/dispensing tip from the patch,
use the syringe to repeatedly withdraw and inject the water.
ISO 8502-6 recommends this process be completed at least
four times and that the test time be agreed between interested
parties. DeFelsko recommends a test time of two minutes or
longer.
c) After the desired amount of time has elapsed, withdraw the
water from the patch.
d) To complete the measurement, completely fill the PosiTector
SST probe’s test cell with the water from the patch. Wait
until the measurement stabilizes (up to 5 seconds), then press
the button to save the temperature (T2)and conductivity
(γ2) of the solution. Δγ, the difference between the γ2soluble
salt reading and the γ1background reading, is displayed.
TIP:
If a memory batch is open, the measurement result will be stored
in memory (pg. 11).
e) Press the button to begin a new test.
Patch Removal
The Bresle Method DeFelsko
Patch peels off the surface
easier and with less residue
than conventional Bresle
patches. Remove it immediately
after the test and dispose.
The Bresle Method PosiPatch
lifts cleanly off the surface, with
absolutely no residue. The user
may choose to discard the PosiPatch and begin the next test with
a new one, or simply rinse it with DI water and reuse for several
more tests until worn.
Rinsing the Test Cell
Rinse the test cell with unused DI water several times after each
measurement, shaking the water out after each rinse.
7
8
Calibration and Verification
Two steps ensure best accuracy…
1. Calibration: typically performed by the manufacturer. All probes
include a Certificate of Calibration.
2. Verification of Accuracy: typically performed by the user by
measuring known reference standards such as the supplied
conductivity standard.
Calibration - Calibration is the high-level, controlled and
documented process of measuring traceable calibration standards
over the full operating range of the probe, and verifying that the
results are within the stated accuracy of the probe. Calibrations are
performed by the manufacturer, their authorized agent, or by an
accredited calibration laboratory in a controlled environment using
a documented process
Verification of Accuracy - Verification is an accuracy check
performed by the user with a solution of known conductivity. To
perform a verification, ensure that the conductivity standard and
instrument are at the same temperature. Remove any remaining
DI water in the test cell by filling it with the conductivity standard,
then inverting the test cell to empty it. Fill the test cell with the
conductivity standard again. If the reading is not within the
combined tolerance of the gage and conductivity standard,
proceed to Cleaning the Test Cell, below.
Cleaning the Test Cell - If the Verification reading is outside the
combined accuracy of the conductivity standard and gage, the
probe may need to be cleaned by filling it with DI water and
rubbing the walls of the cell with a supplied foam tip swab. Rinse
with DI water several times before using the cell.
Verify accuracy at the beginning and the end of each work shift.
During the work shift, if the Gage is dropped or suspected of giving
erroneous readings, its accuracy should be re-verified.
Reset (menu Reset) restores factory settings and returns the
Gage to a known condition. The following occurs:
- All batches, stored measurements, batch names and screen
captures are erased.
- Calibration adjustments are returned to factory settings.
- The last stored background measurement (γ1) is erased.
- enu settings are returned to the following:
1. Power down the Gage and wait 5 seconds.
2. Simultaneously press and hold the and buttons until
the Reset symbol appears.
This returns the Gage to a known, “out-of-the-box” condition.
It
performs the same function as a menu Reset with the addition of:
9
- Date, Time and WiFi settings are not affected by either Reset.
Reset
Setup Menu
Memory = OFF
Bresle Mode = ON
Auto Dim = ON
Display = None
Patch Volume = 3.0 ml
Hi Res = OFF
Bluetooth & Stream = OFF
iFi & Access Point = OFF
USB Keyboard & Stream = OFF
BLE Keyboard = OFF
Surface Density units = mg/m2
Temperature units = °C
Units
Perform a more thorough Hard Reset as follows:
Flip Lock = OFF
Backlight = Normal
Auto Sync .net = ON
Sound = edium
Touch = ON
Language = English
Battery Type = Alkaline
Bluetooth Smart = OFF
USB Drive = ON
- Bluetooth Pairing info is cleared.
- enu settings are returned to the following status:
NOTE:
Allows the operator to change the displayed units for both
Temperature (°C or °F) and Surface Density (mg/m2or µg/cm2).
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3
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