03.09
product manual
H-2786C
Air Meter
Operation Instructions
1. Place a representative sample of concrete in 3 equal layers,
consolidating each layer by rodding and tapping the bowl, vibration
may be substituted.
2. Using a sawing motion, strike off the excess concrete across the top
flange with the screeding tool. Wipe the flanges clean.
3. Clamp the cover on with the petcocks open.
4. Using the plastic wash bottle (supplied), inject water through one
petcock until all the air is expelled through the opposite petcock.
5. Roll the air meter on the perimeter of the base while lightly tapping
the sides to release entrapped air and to ensure complete filling.
Gently close the “hands-free” valve.
6. Pump up air to the initial pressure point, as shown for your meter,
using the super pump.
7. Wait a few seconds and stabilize the gauge needle on the “initial
pressure” line by pumping up or by loosening the bleeder cap,
whichever is necessary.
8. Close both petcocks and open the “hands-free” valve. Lightly tap
the gauge with fingertips to stabilize the gauge needle.
9. Read and record the percent of air shown on the dial.
nnmm
10. Gently close the “hands-free” valve. Open the petcocks to release
the pressure. Remove the cover.
11. Clean the petcock openings, air meter and accessories with water.
12. Open the “hands-free” valve to release the pressure on the gauge.
To Check Calibration of Meter Gauge
The calibration of the meter may be checked as follows:
1. Fill the base with water.
2. Screw the short piece of straight tubing into the threaded petcock
hole on the underside of the cover. Clamp cover on the base with
the tube extending down into the water.
3. Open both petcocks, introduce water via the wash bottle through
the threaded petcock until all the air is forced out the opposite
petcock. Leave both petcocks open.
2
4. Pump up air pressure to a little beyond the pre-determined initial
pressure line.
5. Wait a few seconds for the compressed air to cool to ambient temperature, then stabilize the gauge hand at the proper initial pressure
point by pumping or bleeding off as needed.
6. Close both petcocks and immediately crack open the “hands-free”
valve, exhausting air into the base.
7. Wait a few seconds until the hand is stabilized. If all the air has been
eliminated and the initial pressure line was correctly selected, the
gauge should read 0%. If two or more tests show a consistent variation from 0%, then change the initial pressure line to compensate for
the variation. Use the newly established “initial pressure” point for
subsequent tests.
8. Screw the curved tube into the outer end of the threaded petcock.
Controlling the flow with the petcock lever, fill the 5% calibration
vessel to its full capacity (354ml) with water from the base of the air
meter.
9. Close the “hands-free” valve.
10. Release the air at the free petcock. Open the other petcock and let
the water in the curved pipe run back into the base. There is now 5%
air in the base.
11. With the petcocks open, pump air pressure in the exact manner
as outlined in step 4. Close petcocks and immediately open the
“hands-free” valve. Wait a few seconds for the needle to stabilize
and for the exhaust air to warm to ambient temperature. The dial
should now read 5%.
12. If two or more consistent tests show that the gauge reads incorrectly
at 5% air (in excess of 0.2%, or whatever is considered satisfactory),
then remove the gauge glass and reset the dial hand to 5%. Do this
by turning the recalibration screw, located just below and to the
right of the center dial.
13. When the gauge hand reads correctly at 5%, additional water may
be withdrawn in the same manner to check results at 10, 15, 20%,
etc.
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.
3
3. Maintenance of the “hands-free” valve:
Unscrew the valve stem from the valve body using the top brass
hex nut. Using a coarse piece of emery cloth or sandpaper, remove
the debris and wear lines on the brass valve taper with 2 or 3 quick
sandings. One, or two quick polishes with 500 emery cloth finishes
the cleaning. Coat the valve taper with white lithium or plumber's
grease. Before returning the valve stem to the valve, ensure that the
valve hole is clear all the way through to the underside of the cover.
Screw the valve stem back into the valve.
4. If the “hands-free” valve continues to leak, put the air meter cover
on a flat surface and strike the top of the valve with a direct hammer
blow. You may need to turn the top handle once or twice to tighten
it down. Repeat if leaks persist.
4
H-2785.7
H-2785.2
H-2785.3
H-2785.6
H-2785.5
H-2785.6A
H-2785.DB
H-2786C.6
H-2786C.6A
H-2786.10
H-2785C.43
H-2785.5
H-2785.2
H-2786C.9A
H-2786C.3
H-2785.21
H-2785.7
H-2785.3
H-2786C Replacement Parts
H-2786C.3
H-2785.20
H-2785.19
H-2786C.11SA
H-2785.27
H-2785.23
H-2785.24
H-2785.28
H-2785.25
H-2785C.22
H-2785.26
H-2785.29
H-2785.2 Pressure chamber cap
H-2785.3 Pressure chamber elbow
H-2786C.3 Pressure chamber gasket
H-2785.5 Air-release stem
H-2786C.6 Air-release cap
H-2786C.6A Release cap gasket
H-2785.7 Air meter gauge
H-2786C.11SA Valve assembly complete
H-2785.19 Cover
H-2785.20 Cover o-ring
H-2785.21 Cover Petcock
H-2785C.22 Clamp
H-2785.23 Clamp nut
H-2785.24 Clamp trunnion
H-2785.25 Clamp spring
H-2785.26 Clamp toggle
H-2785.27 Clamp toggle set screw
H-2785.28 Clamp toggle lock nut
5
H-2785.29 Base
H-2785.51 Pump piston o-ring
H-2785.53 Pump tube o-ring
H-2785.DB Super pump assembly
H-2785C.43 Upper o-ring for adapter
H-2786.10 Super Pump adapter
H-2786C.9A Lower o-ring for adapter
H-2785.DB10
H-2785.DB12
H-2785.DB5
H-2785.53
H-2785.DB9
H-2785.DB7
H-2785.DB3
H-2785.DB2
H-2785.51
H-2785.DB6
H-2785.DB4
H-2785DB Super Pump Replacement Parts
H-2785.DB1 Valve nut
H-2785.DB2 Valve
H-2785.DB3 Valve O-ring
H-2785.DB1
H-2785.DB4 Pump tube
H-2785.DB5 Pump cap
H-2785.DB6 Stem nut
H-2785.DB7 Pump piston
H-2785.DB9 Pump stem
H-2785.DB10 Pump handle
H-2785.DB12 Stem cap
H-2785.51 Pump piston O-ring
H-2785.53 Pump tube O-ring
6
Warranty
Humboldt Mfg. Co. warrants its products to be free from defects in
material or workmanship. The exclusive remedy for this warranty is
Humboldt Mfg. Co., factory replacement of any part or parts of such
product, for the warranty of this product please refer to Humboldt
Mfg. Co. catalog on Terms and Conditions of Sale. The purchaser is
responsible for the transportation charges. Humboldt Mfg. Co. shall not
be responsible under this warranty if the goods have been improperly
maintained, installed, operated or the goods have been altered or
modified so as to adversely affect the operation, use performance or
durability or so as to change their intended use. The Humboldt Mfg.
Co. liability under the warranty contained in this clause is limited to the
repair or replacement of defective goods and making good, defective
workmanship.
Humboldt Mfg. Co.
875 Tollgate Road
Elgin, Illinois 60123 U.S.A.
Testing Equipment for
HUMBOLDT
www.humboldtmfg.com
U.S.A. Toll Free: 1.800.544.7220
Voice: 1.708.456.6300
Fax: 1.708.456.0137
Email: hmc@humboldtmfg.com
Construction Materials
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