5
Vaporless Manufacturing, Inc.
8700 East Long Mesa Drive, Prescott Valley, Arizona 86314
800-367-0185 928-775-5191 Fax: 928-775-5309
Email: [email protected] Web Site:
www.vaporless.com
2.
Install LDT-890 Test Unit
Select the dispenser at the highest point of the delivery system. If there is no elevation
difference, select the dispenser farthest from the turbine.
Caution: Eye protection required during the calibration process.
3.
Carefully remove the plug from the test port on the impact valve. There should still be pressure
in the line.
4.
Install the 18” whip hose supplied with the test unit. The application of thread sealing
compound is recommended.
5.
Connect the quick disconnect coupler on the hose from the test unit to the whip hose.
6.
Set the test unit selector to the
P
RESSURE
S
TEP
T
EST
position.
7.
Power On
Turn on the circuit breaker for the product under test.
8.
System Purge
Authorize the dispenser. The turbine should start running. On the right-hand pressure gauge of
the LDT-890, watch for the turbine to achieve operating pressure.
9.
Check all connections for leaks. Correct any fault conditions.
10
. With the large beaker (1000 ml) under the LDT-890 discharge hose, set the selector to the
D
ISPENSER
N
OZZLE
position. Purge the tester of air by allowing 800 to 1000 ml of fuel to flow
into the beaker. After purging the LDT-890, set the selector to the
P
RESSURE
S
TEP
T
EST
position.
11.
Purge the dispenser line by running several gallons of fuel into an approved safety container.
12.
Bleed-Back Measurement
Remove the dispenser authorization. The turbine should stop running. Unless there are fault
conditions such as a leak or significant thermal contraction, the line pressure should stabilize
at 20 – 30 PSI for fractional horsepower turbines, or 20 – 40 PSI for high-capacity or high-
pressure turbines.
13.
With the large beaker under the LDT-890 discharge hose, carefully move the selector to the
D
ISPENSER
N
OZZLE
position. Fuel will begin to flow into the beaker. When fuel stops flowing,
return the selector to the
P
RESSURE
S
TEP
T
EST
position.
14.
Note the volume of fuel collected. This volume is referred to as the
bleed-back
measurement.
Repeat the collection process several times to confirm the bleed-back volume.
Depending on the measured volume, the use of the small (250 ml) beaker may provide more
accurate measurements. The averaging of several consecutive samples is necessary to accurately
determine the bleed-back volume. It is recommended that a record be made of these values and
stored in a convenient location for future reference.
