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44 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
Be sure this procedure places the measurement piston and flag into the full downstream
position.
10. The measurement piston must now be placed into the start position for the
measurement cycle.
For an Upstream water draw (procedure a): Skip to step 19.
For a Downstream (procedure b) or Combined (procedure c) water draw: Turn on the hydraulic
system motor. Toggle the UPSTREAM/DOWNSTREAM switch (S2) on the interface board to the
downstream position. Actuate the RUN/RETURN switch (S1) to the return position. (See Note 3
on page 47.) This will engage the hydraulic system and return the piston upstream. Reference
Figure 2-3 and Figure 2-4.
Once the measurement piston reaches the upstream position, actuate the RUN/RETURN switch
(S1) to the run position. This will release the hydraulic pressure and the measurement piston will
begin traveling downstream. This will also open the solenoid valve (SV) on the water draw
hardware kit. (If this water draw procedure is being repeated from step 19, valve W1 may be re-
opened). When the flag nears the first optical switch (within 1” to 2”), close valve W1 while
throttling valve W3 back to maintain water level in the test measure at or near the zero mark.
Replace the optical assembly cover immediately. The hydraulic system motor may now be
turned off if desired.
11. Water flow into the test measure is now only through the solenoid valve (SV). When the
flag enters the first optical volume switch, the solenoid valve (SV) will close and all
water flow will stop. At this point, fully open valve W3 to drain the test measure and
wait any specified drain time. Close valve W3.
12. 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.
13. Record temperature measurements at T1 and T2 under flowing conditions.
14. Valve W1 must be closed before flag reaches the second 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 enters the
second optical volume switch, valve SV will close and the water flow will stop. The test
measure now contains the downstream volume.