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Maintenance tips – Humboldt H-2786 Air Meter User Manual

Page 5

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4

6. Screw curved tube into the outer end of petcock and by pressing

on thumb lever and controlling flow with petcock lever, fill the 5%

calibrating vessel level full of water from the base.

7. Release the air at the free petcock. Open the other pet cock and let

the water in the curved pipe run back into the base. There is now 5%

air in the base.

8. With petcocks open, pump air pressure in exact manner as out

lined in paragraph 4. Close petcocks and immediately press the

thumb lever. Wait a few seconds for exhaust air to warm to normal

temperature, and for the needle to stabilize. The dial should now

read 5%.

9. If two or more consistent tests show that the gauge reads incorrectly

at 5% air in excess of .2% (or whatever is considered satisfactory),

then remove gauge glass and reset the dial hand to 5% by turning

the recalibrating screw.

10. When gauge hand reads correctly at 5%, additional water may be

withdrawn in same manner to check results at 10%, 15%, 20%, etc.

11. The recalibrating screw is located in the center of the pointer.

Maintenance Tips

1. Prompt cleaning with water of the air meter cover and pot, both

inside and out will ensure a proper seal and volume are maintained.

2. Periodic oiling of petcock screws will prevent them from seizing.

WD-40 or a similar product is sufficient.