DH Instruments E-DWT-H, Руководство по эксплуатации и обслуживанию

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3. OPERATION
Page 19 © 2009 DH Instruments, a Fluke Company
Connect the system under test/DUT to the E-DWT-H TEST port.
Use [HEAD] to enter the fluid head correction for the difference in height between the
E-DWT-H TEST port and the DUT reference level if significant (see Section 3.7.8).
Fill and prime the system under test/DUT (see Section 3.5.1):
Open the test system/DUT at the highest point possible.
Use the filling and priming pump to fill the test system.
Close the test system/DUT when all air has been purged.
Use [AutoRange] (see Section 3.7.5) or [AutoTest] (see Section 3.1.3) to set up the
RPM4-E-DWT for the specific test to be run.
Set zero gauge pressure to the DUT by opening the reservoir cap vent valve, the
reservoir shut off valve and the TEST shut off valve. The RPM4-E-DWT indication may
not be zero if the DUT reference height is different from the E-DWT-H reference height
and/or if a head correction value is set (see Section 3.7.8).
Set the next pressure. Close the reservoir shut off valve. Check that the TEST shut off
valve is open. Use the variable volume and fine adjustment valve to set pressure as
needed (see Sections 3.5.2, 3.5.3).
When the DUT is stable, read the reference pressure applied from the RPM4-E-DWT.
After the last pressure, return to zero by opening the reservoir shut off valve. The
RPM4-E-DWT indication may not be zero if the DUT reference height is different from the
E-DWT-H reference height.
3.2 Test Port Connection
High pressure TEST ports are provided on the top and rear of the E-DWT.
The test port connection is a DH500 F. DH500 is a gland and collar type fitting for 1/4 in. (6 mm) coned
and left hand threaded tube. DH500 is equivalent to AE F250C, HIP HF4, etc.
W
Caution
•
USE THE CORRECT PRESSURE CONNECTORS: The E-DWT-H TEST port
fitting is a DH500 F (see Section 1.2.1). It is NOT a 1/8 in. NPT F. Never use
a fitting other than the corresponding male fitting in these connectors.
Damage to the connectors and dangerous failure under pressure could
result from using incorrect fittings.
•
DO NOT APPLY PRESSURE UNTIL YOU ARE FAMILIAR WITH OPERATION:
The E-DWT-H TEST ports can connect internally to both the RPM4-E-DWT’s
Hi and Lo (if present) Q-RPTs. In E-DWT-Hs with dual Q-RPTs, the LO
Q-RPT SHUT OFF valve on the front of the E-DWT-H isolates the low
pressure Q-RPT when the high pressure Q-RPT is in use. Do not apply
pressure to the E-DWT-H until you are familiar with its operation and know
how to protect the low pressure Q-RPT, if present, from overpressure (see
Section 3.4). FAILURE TO PROTECT THE LOW PRESSURE Q-RPT FROM
OVERPRESSURE MAY DESTROY IT. DAMAGE DUE TO Q-RPT
OVERPRESSURE IS NOT COVERED BY THE PRODUCT WARRANTY.