Section VII. PRESSURE GAUGES

5-4220-200-12-1

Section VII. PRESSURE GAUGES

GENERAL.

4-19

This section contains instructions for the inspection and maintenance of both tank pressure gauges (fig. 1-1 fur-

nished with the open circuit SCUBA system. Operational use of these gauges are located in paragraph 2-5, Chap-

4-20 INSPECTION.

Gauges will be checked for accuracy in accordance with Table 4-2, item 2. Meter accuracy must be within the follow-

ing tolerance levels: ± 50 PSI at 500 PSIG and ± PSI at 3000 PSIG. If a gauge does not meet these requirements

replace with a new gauge.

4-21

REPAIR.

Tank Pressure Gauge Assembly (Regulator Attachable). Item (1), (3), (5), (7) and (8) (fig. 4-6) may be

replaced when required. Do not attempt to repair the pressure gauge (1) cover (2) or fittings (4) and (6).

Gauge Tank Pressure. Do not attempt to repair this gauge. If defective replace with a new one.

Section VIII. LONG TERM STORAGE

4-22 GENERAL.

This section contains long term storage (in excess of 180 days) instructions for all components of this system.

4-23 DEMAND REGULATOR.

For prolonged storage of the regulator, an airtight plastic bag is used to maintain the life of the rubber parts. The

regulator and hose must be thoroughly dried before storage. Place it in the bag, suck all air from the bag, and twist

on a lock wire to seal it closed. Store it in a dry place.

TWIN TANK BLOCK ASSEMBLY.

4-24

For prolonged storage place the complete assembly (including valve manifold and harness assembly) in a plastic

bag and store in an upright position.

Each cylinder should contain air pressure from 50 to 100 PSI. Store in a cool

place.

4-25 PRESSURE GAUGES.

Place each gauge in an airtight plastic bag. This will increase the life of the rubber components of the gauge.

4-29