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For more information, or if you have questions not addressed on this page, please check the catalog or get in touch with us via phone or email.

Table of Contents

Aqua Glo:

Gammon Gauge:

Other Questions:


The Aqua-Glo:


Do the standards have a shelf life?

They will last indefinitely unless physically damaged.

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What happens if I lose a calibrating or fluorescing standard?

Send the remaining standard to us for evaluation. We may be able to make a new match for it. If we cannot, then you will have to buy a new set, GTP-835.

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What happens if I lose both standards?

You can buy a new set, GTP-835.

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How long are the water detector pads good for?

As long as the seal on the barrier bag is not broken, they should last indefinitely. However, if a pad has turned yellow, then it has spoiled and is no longer fit for use.

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What do I do if my Aqua-Glo doesn't work?

Call us, and we will advise you as to whether or not you need to return the unit to us.

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How often do I need to calibrate the Aqua-Glo?

Our instruction manual explains that you must calibrate it every time you use it.

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What is the return/repair procedure for an Aqua-Glo?

If you need to return an Aqua-Glo for repairs, see the Return Service page.

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The Gammon Gauge:


Does the gauge ever need calibration?

As long as the piston falls within the zero range on the scale when at rest, you do not need to calibrate the Gammon Gauge.

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What do I do if the piston doesn't fall within the zero range?

If the piston will move freely in the glass cylinder when removed from the gauge, the spring must be replaced.

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What do I do if the piston won't move freely?

Disassemble the gauge. Clean the glass with a Scotch brite pad. Do not use anything else. Reassemble the gauge. If the piston still will not move freely in the glass cylinder when removed from the gauge, you can either return the gauge to us or replace the glass and piston. Never send in a gauge that has fuel in it!

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What if I can't get the piston out?

You can either return the gauge to us or replace the glass and piston. Never send in a gauge that has fuel in it!

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What is the return/repair procedure for the Gammon Gauge?

If you need to return an Gammon Gauge for repairs, see the Return Service page.

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How do I change the set point on the GTP-8980 Gammon Gauge Control System to 15PSID?

Please refer to the document "Adjusting GTP-8980 Differential Pressure Set Point."

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The Gammon Gauge is showing high differential pressure. Do I need a new spring?

Probably not. Test the spring with the 3-way valve. If the piston deflects to 30PSID with flow and returns to zero when the test valve is released and pump is off, the Gammon Gauge is working. Check filter elements and check the fuel for dirt, water, or icing. You do not need to send the Gammon Gauge out for calibration. See the calibration certificate.

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I need to change my Gammon Gauge from 0-30psi to 0-15psi, or vice versa. How do I do that?

You must change the scale and the spring inside the piston. This is a good time to replace the O rings and the filter as well. Clean the glass tube inside and the piston outside with Scotchbrite, and/or cotton cloth.

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Other Questions:


My Mini-Monitor housing is leaking at the large bottom thread. What o-ring do I need?

There is no o-ring on the threaded housing. Fuel should only travel through the plastic monitor, not around it. If you are re-using the plastic monitors, try using a new one. The leak may be due to a worn-out plastic monitor. If not, then replace the 2 o-rings INSIDE the housing. GTP-2200-06V on top. GTP-2200-12V on the bottom. This does not apply to the GTP-3318 high pressure monitor holder, which is rarely used except on high pressure pipeline use. It is all stainless, not gold like our standard MiniMonitor “Millipore”-type tester.

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Can I test or calibrate my Viper or Scorpion additive injector pump with fuel?

If the Viper or Scorpion is for anti-icing additive: NO! The neoprene seals work great with anti-icing additive but are not compatible with fuel. Pumps for other additives would be OK, but it is preferable to test with the additive the pump is intended for. There is no rubber compatible with both jet fuel and pure DiEGME anti-icing additive - a.k.a. “Prist” or FSII. We do provide replacement seals at a small charge.

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My fuel is a different or darker color than usual or the membrane color rating is darker or a different color or a hydrometer reading if different that we usually get, can I use the fuel?

GTP cannot advise whether or not to use fuel. If it is different than what you are used to seeing, you must investigate further. Contact the fuel supplier and ask them if their fuel has changed. Compare your results with their test results. If the fuel you received is different from what they sent to you, isolate the fuel and do not use it until it is cleared by your supplier as safe. A common cause of contamination is accidental mixing of fuels at the terminal or in the delivery truck or pipeline.

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What is that little valve next to the pump on the Sump Separator? There is tubing back to the tank.

GTP-8884 is a bleeder valve to help the centrifugal pump prime. Air, then fuel, will be released until pump pressure builds up.

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