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46 Water draw procedure: (Reference Figure 4-4 and notes on page 47)
Section 4: Maintenance Operating and maintenance instructions
January 2015 3-9008-701 Rev J
necessary, to maintain the water level in the test measure near the zero mark. When the
flag exits the second optical volume switch, the solenoid valve (SV) will close and the
water flow will stop.
21. Fully open valve W3 to drain the test measure and wait any specified drain time. Close
valve W3.
22. Check and record the system (flow tube) pressure at P1. Actuate the RUN/RETURN
switch (S1) to the run position. (See Note 3 on page 47.) This will open the solenoid
valve (SV) on the water draw hardware kit and begin to fill the test measure. Open valve
W1, if desired, to increase piston travel speed.
23. Record temperature measurements at T1 and T2 under flowing conditions.
24. Valve W1 must be closed before the flag reaches the first optical volume switch. This
can be determined by listening to the tone of the water splashing in the test measure.
When the water level begins to rise into the tapered top of the test measure, the tone
will rapidly increase. At this point, immediately close valve W1. When the flag exits the
first optical volume switch, valve SV will close and the water flow will stop. The test
measure now contains the upstream volume.
25. Slide optical assembly cover back to expose the second optical volume switch and the
ends of the invar rods. Measure and record the temperature at Td (invar rod
temperature) using the digital thermometer and contact probe. Replace the optical
assembly cover. See Note 4 on page 47.
26. Record the scale reading shown on the calibrated section of the test measure. This
measurement must be taken from the bottom of the meniscus inside the glass tube.
27. Record Tm, the temperature of the test measure (i.e. the water temperature inside the
test measure). See Figure 4-5. Open valve W3 momentarily, allowing about ½ gallon (2
liters) of water to drain out, and measure the temperature of the drained water with the
temperature thief.
28. Open valve W1 momentarily to replace the water drained from the test measure. This
will allow the flag to proceed upstream just beyond the first optical volume switch.
29. For the Upstream (procedure a) water draw: The measurement piston must be moved
to the downstream position. Close valve D2, and open valves V2 and D1. This will allow
the measurement piston to move downstream. Observe the flag position until the
piston reaches the full downstream position and replace the optical cover. Proceed
from step 19 for as many Upstream measurement cycles as desired. See Note 2 on page
47.
For the Combined (procedure c) water draw: Reset the valves for downstream flow (V2 and D1
open; V1 and D2 closed) and continue to step 30.
30. Toggle the UPSTREAM/DOWNSTREAM switch (S2) on the interface board to the
downstream position. Actuate the RUN/RETURN switch (S1) to the run position. (See
Note 3 on page 47.) This will open the solenoid valve (SV) and the measurement piston
will begin to move downstream. Throttle valve W3, if necessary, to maintain the water