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

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5. MAINTENANCE, ADJUSTMENTS AND CALIBRATION
Page 97 © 2009 DH Instruments, a Fluke Company
5. Maintenance,
Adjustments and
Calibration
5.1 Overview
E-DWT-H was designed for maintenance free operation. No maintenance is required other than:
•
Regular AutoZeroing of quartz reference pressure transducers (Q-RPTs) (see Sections 3.9.1, 3.7.10).
•
Periodic calibration of Q-RPTs (see Section 5.3).
•
Adjustment of the on-board barometer (see Section 5.2.2).
•
Overhaul of the E-DWT-H (see Section 5.4.1).
From a maintenance, calibration and repair point of view, the RPM4-E-DWT reference pressure monitor
and the rest of the E-DWT-H are treated as separate sub-systems.
Note
•
E-DWT-H is a sophisticated pressure measuring instrument with advanced
on-board features and functions. Before assuming that unexpected
behavior is caused by a system defect or failure, use this manual and other
training facilities to become thoroughly familiar with E-DWT-H operation.
•
For rapid assistance in specific situations see Chapter 6 for
troubleshooting information.
•
Unauthorized service or repair of E-DWT-H during the warranty period is
undertaken at the owner’s risk and may cause damage that is not covered
under warranty and/or may void the warranty. For warranty service,
contact a DHI Authorized Service Provider (see Table 19).
5.2 RPM4-E-DWT Maintenance
The only regular maintenance of the RPM4-E-DWT is day to day zeroing of the Q-RPTs (see Section
5.2.1), regular recalibration of the Q-RPTs (see Section 5.3) and adjustment of the on-board barometer
(see Section 5.2.2).
5.2.1 AutoZero of Q-RPTS
See Sections 3.9.1 and 3.7.10 for complete information on Autozeroing of Q-RPTs.
The RPM4-E-DWT should be AutoZeroed prior to running each test.
Before AutoZeroing, allow at least two minutes for full system stabilization. Be sure that the
pressure applied is truly zero (i.e., the E-DWT-H TEST port is open to atmosphere).
To cause the range to Autozero, press [AutoZ] .