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Gammon - Gauge |
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The Peak-Hold feature registers the highest reading, locking the piston so the operator can see maximum differential pressure for the most recent fueling operation. Turning the large knob releases the piston so that it can return to zero. |
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Peak-Hold
With Push Button Test Valve GTP-534PB-PH |
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Original Model
GTP-534 |
Push Button
In Front GTP-534 PBF |
Rotary 3-Way
Test Valve GTP-534V |
Push Button
3-Way Test Valve GTP-534 PB |
Unique Features
Peak-Hold reading - The maximum differential pressure that is measured during an operation automatically locks the piston so that the operator will have that information without actually having watched the gauge at the time. After the reading has been seen, the operator releases the piston by turning a knob. It is usually impossible for the operator to see the gauge while refueling an aircraft so the highest differential pressure reading is rarely seen, just as a case of an unmanned facility such as a pipeline or hydrant system. This feature eliminates that problem. Push Button Test Valve - hold the button inward to relieve pressure under the piston. System pressure will force the piston down so the operator can observe notion. Erratic movement of the piston indicates contamination of piston and glass tube, requiring cleaning. Pressure Relief Feature - Incorporated in all Push Button models is a pressure relief valve set at 300 psi to protect the gauge from excessive pressure if isolation valves have been closed. Common Features of All Models of the Gammon Gauge
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System pressure gauges available to mount at top of all models To add a 2" face diameter gauge, order: GTP-686A for 0-60 psi GTP-686C for 0-160 psi |
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Examples:
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Note 1 | A suffix D provides 2 selector valves, one at each connection. The ports on each valve are labeled A and B so that the gauge can be connected to measure differential pressure alternately on two different filters or on a filter having two stages. | |
Note 2 | Same as note 1 but suffix G denotes 1/4 B.S.P. threads | |
Calibration Testing |
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To meet API-1581 and 1583, you must have a 3-way test valve. Our 3-way valve GTP-2305 and the Push Button Gammon Gauges meet this requirement and are used to check calibratiion as well as to check free movement of the piston.
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If the piston returns to zero, you have not only calibrated the gauge, you have checked it for free movement across it's entire range. If the piston moves slowly or erratically, the filter (located in the top of the gauge) may be clogged and need replacement. This calibration technique is accepted by all major oil companies, airlines and military services worldwide. Gammon Gauges have been in service in virtually every major airport in the world for as long as 30 years and we have never heard of, or seen a single gauge go out of calibration. Occasionally a piston will stick after many years in service, but hand cleaning with "Scotch Brite" plastic abrasive will make it as good as new. (Do not use sandpaper or steel wool). Replace o-rings and reassemble. | ||
Conversion of Existing Gammon Gauges |
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An existing Gammon Gauge can be converted to have the Peak-Hold and the Push Button Test Valve by replacing the lower flange of the gauge. Order as follows: | ||
Standard GTP-534
Aluminum |
add Push Button
GTP-552-8PB |
add Push Button and Peak Hold
GTP-552-40 |
On Gammon Gauges without a Push Button, a GTP-2305 3-way ball valve can be installed. |
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Protect Against Filter Element Bursting
Add A Differential Pressure Switch To The Gammon Gauge Sound Alarm - Stop Flow, Turn on Second Filter If differential pressure suddenly increases or a facility is operated without personnel monitoring the differential pressure, filter element failure can occur. This new switch is unique. It adds differential pressure control at a low cost using a non-powered proximity switch. This simple double-sealed switch is ideal for use in PLC ( miniature computer) and relay controlled systems. The connection box is rated NEMA 4X. Control options are also available if you don't plan to use an external control. We have weather tight and explosion proof versions. We strongly recommend a 3-way test valve for properly testing the Gammon Gauge and Proximity Switch and / or system. Conversion? Any Gammon Gauge can be converted to include the new proximity switch. |
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How to Order the Correct Part Number |
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Example
GTP-8980-C-B12 is a different pressure as follows: Push Button Gauge |
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