Gammon GTP-322 Manuel d'utilisation - Page 3

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SAMPLE CONNECTION continued

The sampling connection may be located on the pipe before and after a filter vessel (filter separator or monitor) to allow you

to compare the readings to determine the performance of the filter in removing free water. Connections should be available

for obtaining Aqua-Glo test results all the way from the refinery to the aircraft refueling nozzle.

FLUSHING

Attach the empty test pad holder assembly to the quick disconnect coupler at the sample connection. Establish system

flow. Open the toggle valve by lifting the handle. Allow at least 1 liter of fluid to pass through the assembly into a collection

container. Opening and closing the valve several times will insure better flushing. Remove the assembly after flushing.

SPOILAGE OF WATER DETECTOR PADS

Aqua-Glo test pads are heat sealed in aluminized composite envelopes to ensure that moisture from the air will not reach

the pad. Pads that were stored for 8 years were still in good condition, but statistical studies have proven that up to 4 or

5% of the envelopes have enough water permeability to spoil the pads. This occurs in the first six months. A spoiled pad

is easily identified by its yellow color. The operator should inspect every pad before it is used. If it is not orange in color, it

must not be used.

TEST PROCEDURE

NOTE: An abbreviated test procedure may be found on last page of this manual.

Do not remove the test pad from the hermetically sealed package until ready to use. Do not touch the pad with fingers; use

the included pointed tweezers to handle the pad at all times. Do not allow any discrete water droplets to come into contact

with the pad (from rain, sneezing, coughing etc.). Exposure of the test pad to the atmosphere, especially on humid days, will

also ruin the pad in a matter of minutes.

Open the test pad holder assembly and insert a test pad in the outlet half using tweezers. Be sure that the orange colored

side of the pad is facing upstream (you can see the orange side with the pad in the holder). Run the test immediately.

Attach the test pad holder assembly to the quick disconnect. Open the toggle valve.

Pass 500 ml of fuel through the pad, accurately measuring the test sample quantity in the calibrated plastic bottle in the kit.

Normal sample volume is 500 ml of test fuel, but if the reading is off scale (on high side), a sample volume as small as 100

ml in volume may be used in a repeat test using a new pad, by applying a correction factor, as explained below. A small

graduated cylinder should be used to measure smaller sample volumes accurately. The reading must be adjusted to allow

for a smaller sample volume; see Calculation on the next page.

RATING PROCEDURE

Remove the test pad from the holder using tweezers and press between dry paper blotters or absorbent towels to remove

excess fuel. Press firmly (about 5 lb. force) 3 or 4 times with heel of hand, moving the pad with tweezers each time.

For maximum accuracy, the test pad should be read within 3-5 minutes after sampling is initiated. If the test pad is not read

immediately after sampling, it must be placed in a desiccator to prevent moisture pick up from the air. However, readings

made on dried test pads, that is, not damp with fuel, should be avoided if possible since they will give high and erroneous

results. Conversely, rating a pad which has not been well blotted will give a low reading as the excess fuel will absorb part

of the ultraviolet light and decrease fluorescence.

The ultraviolet light must be on to get a reading. This can be verified when the switch is turned on. The center of the white

indicator button will glow a light green if the ultraviolet tube is operating. In bright sunlight, you may have to cup your hand

over the indicator to see that the button is glowing.

Turn off the instrument light immediately after use to conserve battery power. If the pointer will not go all the way to the zero

(center). Move the lever until the pointer is as close to the center as possible. If the lever is below the 1 mark, your fuel has

less than 1 ppm of water. If the lever is at the 12 end of the scale, you have more than 12 ppm.

Record the instrument reading where the lever crosses the scale (estimated to the nearest tenth). Record the sample

volume and the fuel temperature at the time of the test. See section titled "Comments."

Visual observation of the used test pad is often of value. This is easily accomplished by removing the photocell comparator

assembly and viewing the test pad through the rectangular window on the side of the instrument in a darkened room with

the ultraviolet light turned on. Free water in fuel is normally well dispersed and will form an even distribution of many small

points of yellow fluorescence on the test pad when illuminated.

Large water drops, however, will form a few large spots of yellow fluorescence on the pad. These large spots usually are

indicative of a separator element failure, rather than a coalescer element failure if the test is performed downstream of a

filter separator.