The GXL-24PRO GOLD TESTER is
a high technology professional digital
instrument, developed by Tri Electronics, Inc.
for efficient, non-destructive determination of
gold karat values from 6 to 24 karats.
The GXL-24PRO GOLD TESTER determines platinum
and the gold karatage in the 6-24 karat range in
alloys commonly used in the jewelry industry.
Besides determining the karatage of gold, the
Gold Tester is also able to distinguish gold
plated and gold-filled items.
THE GXL-24PRO DISPLAY
THE MECHANICAL SENSOR
The Mechanical Sensor for the
GXL-24PRO Gold Tester consists of two parts: (1)
the sensor body; (2) a polyethylene tube with
gel. The polyethylene tube must be placed inside
of the sensor's body before beginning a test.
When using the Sensor, be sure that:
The sensor nozzle
platinum contact and slots are clean. Use a
cotton swab moistened with cleaner to clean
the platinum contact and dry it before
commencing tests and after every 6-8
Dispense a drop of gel
before the start of each test.
It is recommended that
the sensor be thoroughly cleaned with Tri
SC-10 sensor cleaner when gel tube is
changed or if gel is backing up around the
plunger. The cleaner can be obtained from
Tri Electronics or from your Tri dealer.
THE POLYETHYLENE GEL TUBE
Take off the nose cone
cap (See Diagram).
Remove the Stationary Cap
by turning the Stationary Cap (light colored
barrel) counter clockwise. Please remember
that the stationary Cap and the Rotary Cap
are not detachable.
Insert the Feed Screw
Engagement into the appropriate slot of the
Rotary Cap. Be sure that the Feed Screw is
Take off Tube Cap.
Insert the polyethylene
gel tube, until it is fully lodged in the
sensor and turn the light colored barrel
clockwise until fully fastened. Do not turn
the dark colored top barrel clockwise or it
will damage the mechanism.
Turn the dark colored top
barrel counter clockwise until the first
drop of gel appears at the sensor nozzle (about
10-20 times to fill the cone).
Diagram shows each part
of the mechanical sensor.
Sensor and Polyethylene Gel tube
Load the polyethylene gel
tube into the sensor.
Connect the long black
wire to the sensor's plug outlet, the short
black wire connector to the display unit,
and the red wire to the testing plate.
Turn the unit "ON". The
unit should display "Clean sensor tip ".
Before the start of
testing, use the sensor nozzle cleaner or
any small sharp instrument to remove dried
or used gel from the dispenser opening and
slots and clean the sensor tip thoroughly
with a cotton swab wetted with alcohol, then
dry the tip thoroughly.
Prepare the item for
testing by thoroughly vigorously cleaning a
spot on the jewelry with the eraser provided.
When testing the 18-24K (750-999) gold, be
sure that the eraser tip does not have a
black deposit. Clean the eraser on a paper.
Also clean the area on the item to he
clipped and place cleaned item in clip.
The testing point on the
object should he close to, BUT NOT TOUCHING,
the alligator clip.
Holding the sensor on the
vertical position with the nozzle down,
twist the Rotary Cap counter clockwise, a
click at a time, until a drop of gel appears
on the tip. Wipe this first drop 0/gel on
the towel and turn (usually one or two
clicks) until afresh drop appears. Use a
minimum amount of gel for testing,
especially for high karatage gold tests (above
18k). After dispensing a small dome of gel
on the sensor tip wipe the tip on a piece of
tissue paper by touching the tip to the
tissue while holding the sensor in a
vertical position to the paper. Do NOT use a
dome of gel or an amount of gel that causes
excess gel to appear along the edge of the
sensor tip while testing. If there is not a
sufficient gel to test the instrument will
read "TRY AGAIN", but will not give an
erroneous reading. Do not let gel or sensor
nozzle touch the alligator clip!
Maintain the sensor tip
flat against the sample (perpendicular to
sample) and hold firmly in the same position
approximately five (5) seconds while the
instrument displays the gold value in karat
and European standard.
If there are any
problems regarding the GXL-24PRO, please contact:
TRI Electronics Inc.
9570 Ridgehaven Court, Ste "A"
San Diego, CA 92123
Attn. Service Dept.
Phone 858) 571-4881
FAX (858) 571-5404