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THEORY OF OPERATION
MECHANICAL (cont’d)
9.1
The pneumo system operates on the bases of a tube extending from the surface of the water to
the depth at which the measurement is going to be taken. Air (pressurized) is forced into the tube,
until all the water is forced out of the tube. In fact, bubbles of air will come out of the end hose.
The air is then shut OFF, (this eliminates any additional pressure from flow) the pressure will then
stabilize equal to the pressure at the end of the hose. The pressure in the hose will then equal the
pressure at the end of the hose, and the depth.
The pressure is then read on a very accurate gauge. The dial of the gauge is calibrated in Feet of
Seawater rather than Pounds per Square Inch (PSI), eliminating the need to convert from PSI to
FSW.
The pneumo gauges have a 6-inch dial, dual scale 0-250 FSW/0-76 MSW, with 1-foot calibration
increments. The accuracy of the gauge is 0.25% of full scale. Gauges are supplied with calibration
certificates traceable to the National Bureau of Standards. The gauges must be Calibrated every
six months to guaranty their accuracy. Gauges should be cross checked before every dive, if there
is a discrepancy of more than 2% between gauges, the gauges must be calibrated before being
placed in service.
Pneumo valves, one for each diver, shut off type valve, KEL-F seat for positive shut-off.
Pneumo gauge protectors, each pneumo gauge is protected by an automatic valve which is
factory set to shut off all pressure to the gauge when the pressure reaches or exceed the set
point. The set point for a slow rising pressure is approximately 10% above full scale, 122 PSI. Fast
rising pressures will be shut off at a lower pressure. The gauge protector will automatically release
when the pressure is reduced. The gauge protector also includes a gauge snubber to protect the
gauge from pulsations (shocks) in the pressure applied to the gauge.
34
Содержание 8225-HP
Страница 16: ...CONTROLS CONNECTIONS AIR CONTROL FRONT PANEL MODEL 8225 HP 6 3 12...
Страница 18: ...CONTROLS CONNECTIONS PNEUMO FRONT PANEL MODEL 8225 HP 6 6 14...
Страница 20: ...CONTROLS CONNECTIONS COMMUNICATOR FRONT PANEL MODEL 2825A 8225 6 8 16...
Страница 29: ...OPERATING PROCEDURES DIAGRAM SET UP INSTRUCTIONS Figure 3 8 7 25...
Страница 31: ...OPERATING PROCEDURES DIAGRAM SIMULCOM 4 Wire Connection Model 2825 8225 Figure 4 8 9 27...
Страница 39: ...THEORY OF OPERATION FLOW DIAGRAM MODEL 8225 HP 9 2 35...
Страница 42: ...THEORY OF OPERATION FUNCTIONAL BLOCK DIAGRAM MODEL 2825 8225 9 4 38...
Страница 52: ...REFERENCE MATERIAL DIVING LOG U S NAVY CHART 12 1 48...
Страница 53: ...REFERENCE MATERIAL REPETITIVE DIVE WORKSHEET 12 2 49...
Страница 58: ...DRAWINGS SCHEMATICS SCHEMATIC DIAGRAM MODEL 2825A 8225 13 1 54...
Страница 59: ...DRAWINGS SCHEMATICS PARTS IDENTIFIER 2832 202 13 2 55...
Страница 60: ...DRAWINGS SCHEMATICS SCHEMATIC DIAGRAM 28FDW OPTION 13 3 56...
Страница 61: ...DRAWINGS SCHEMATICS SCHEMATIC PARTS LOCATOR MODEL 2324 202 13 4 57...
Страница 62: ...DRAWINGS SCHEMATICS PARTS LOCATOR MODEL 8225 200 Pneumo Front Panel 13 5 58...
Страница 63: ...DRAWINGS SCHEMATICS PARTS LOCATOR MODEL 8225 200 Pneumo Back Panel 13 6 59...
Страница 64: ...DRAWINGS SCHEMATICS PARTS LOCATOR MODEL 8225 400HP Air Control Front Panel 13 7 60...
Страница 65: ...DRAWINGS SCHEMATICS PARTS LOCATOR MODEL 8225 400HP Air Control Back Panel 13 8 61...
Страница 66: ...DRAWINGS SCHEMATICS PARTS LOCATOR MODEL 8225 400HP2 Air Control Front Panel 13 9 62...
Страница 67: ...DRAWINGS SCHEMATICS PARTS LOCATOR MODEL 8225 400HP2 Air Control Back Panel 13 10 63...
Страница 68: ...DRAWINGS SCHEMATICS PARTS LOCATOR MODEL 2825A 8225 28FDW Diver Communications 13 11 64...
Страница 69: ...DRAWINGS SCHEMATICS 65 PARTS LOCATOR MODEL 8000 0201 Regulator 13 12...