Gammon GTP-322 Manuale operativo - Pagina 4

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CALCULATION

Correct the reading if the sample volume is other than 500 ml.

PPM free water =

NOTE: The velocity of the fuel through the pad will have an influence on accuracy if the flow rate is not between 600 and

800 ml/min. The 1 mm diameter orifice upstream of the test pad serves to control velocity over a wide pressure range but

on site controls may be required. The orifice also serves to break up water droplets and promote uniformity of distribution

on the test pad.

OTHER FLUIDS

The Aqua-Glo Water Detector Kit can be used to determine the undissolved water content of fluids that are not in the jet fuel

category but there are several factors that must be considered. First of all, material compatibility of the detector pad holder

and its various components must be studied. The detector pad holder itself and the toggle valve are anodized aluminum.

Seals are Buna N. Tubing is urethane. Components made of other materials are available and will be quoted on request.

Another consideration is the detector pad itself. Certain alcohols may remove the fluorescein coating. Strong chemicals may

damage the filter paper pad itself.

Low boiling point fluids, such as LNG, butane, etc., create special problems that require consideration. First of all, the

volume of a fluid that evaporates rapidly cannot be determined in the open bottle that is provided in the kit. Several methods

can be used, depending on the test fluid. One method is to use a sample bomb. Another is to place a graduated cylinder in

a refrigerated bath. Precautions must also be taken to prevent condensation of moisture on the cold detector pad after the

pad has been removed from its holder. An effective way to handle this is to immediately drop the pad in a beaker containing

clean, dry kerosene. The use of dry kerosene as a "conditioner" is required whenever a test is to be performed on a non-jet

fuel fluid. The reason is that the calibration of the Aqua-Glo scale is based on a jet fuel damp detector pad.

Gasoline - No special procedure is required when testing gasoline, except that the pad must be placed in clean, dry

kerosene (jet fuel) briefly before blotting it between paper towels. See Rating Procedure. This is a necessary step to prevent

moisture from humid air from condensing on the pad as it cools during evaporation of the gasoline. Also, the Aqua Glo

instrument is calibrated with a kerosene-damp pad and this procedure will insure that condition.

Heating oil and diesel fuels- Some oils and fuels such as diesel, fuel oil and lubricating oils have a natural fluorescence

(they glow in ultraviolet light). This can cause an error. You can predetermine the error to allow you to correct the reading, if

any, in the Aqua-Glo. Simply dip a new pad in the oil to be tested; then blot it as instructed above and take a reading. This

number must be subtracted from a test result for water. Alternatively, you can eliminate the error by flushing the pad, after

testing, with known dry kerosene or jet fuel.

Additives in fuels, including jet fuel, have variable effects on readings. Generally, heating oil additives tend to mask the

presence of water, but experience to date indicates that additives in jet fuel tend to cause slightly higher readings.

CARE OF THE MAIN BATTERY (GTP-2324)

Do not leave the Aqua-Glo light running continuously. Do not leave the battery charging for more than 2 days without use.

The main battery is built-in and is rechargeable. If it is ever necessary to replace it, the entire side cover of the light unit must

be removed (7 screws). Then separate the wire connector having the black and red wires. The battery clamp can now be

removed by first removing 2 screws, one at each end.

An external battery is not supplied with the kit but may be ordered as Model GTP-2404. It is useful when extended tests

must be run when AC power is not available for recharging. To recharge the external battery, connect it to the power supply

using a connector cable Model GTP-9329

To recharge the internal battery, simply connect the power supply included. It will operate correctly on 115 VAC to 240 VAC,

50/60 Hz. A full charge takes up to 16 hours.

CARE OF THE PHOTOCELL COMPARATOR (INSTRUMENT PACK)

Heavy use will eventually deplete the 9 volt battery in the instrument pack. If very frequent recalibration is necessary, this

can mean that the battery is weak. If the meter responds sluggishly, this may also indicate a weak battery. Replace with any

good quality 9 v battery or order our Model GTP-892. Remove the 4 battery cover screws to reach the battery.

Frequently wipe dust and finger marks from the green glass filters. Use a soft cloth or a bit of cotton. This assembly is easily

damaged if it is dropped. Generally, the damage is one or more of 3 problems.

Therefore, if it is dropped, the operator should inspect as follows:

1. Bent attachment flange - This can be straightened, but any black paint that is scratched must be replaced to prevent

errors due to reflection. Use dull, flat black paint.

scale reading x 500

sample volume, mL