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© 1995 - 2010 Fluke Corporation, DH Instruments Division
5.
Maintenance, Adjustments and
Calibration
5.1
Product Overview
was designed for maintenance free operation. No maintenance is required other than:
•
Taring of Reference Pressure Transducers (RPTs) to zero differential for molbloc-L operation:
This function is not a separate MAINTENANCE function or automatic activity, it is part of
regular operation (see Section 3.4.4.1).
•
AutoZero of Reference Pressure Transducers (RPTs):
Regular rezeroing of the RPTs absolute
measurement mode to a barometric reference standard using the AutoZ function is recommended
(see Section 3.4.4.4).
•
Reference Pressures Transducer (RPT) Calibration:
An annual recalibration cycle is recommended.
See Section 5.2 for RPT calibration instructions.
•
Optional MFC Control Function Verification:
The stability of the MFC control function analog
voltage and current measurements over time is dependent upon the conditions of use. The MFC control
function accuracy should be verified regularly. See Section 5.3 for instructions.
•
Ohmic Measurement System Verification:
A five year verification interval is recommended. See
Section 5.4 for instructions.
•
molbloc Calibration:
molblocs can be calibrated separately from the . A one year recalibration
cycle is recommended. Calibration of a molbloc consists of comparing the mass flow measured by
the combination of the molbloc and a calibrated molbox to a suitable mass flow standard flowing the
gas for which the calibration is being performed. Since the molbloc is a static, stainless steel element,
characterized by proprietary calibration coefficients determined in the original factory calibration, an out of
tolerance molbloc is usually considered to require repair. For facilities requiring the capability to
adjust molblocs to agree with their mass flow standard,
CalTool for molbloc Extension to
COMPASS for Flow
software is available.
This section provides information on maintenance, adjustment, calibration procedures and recommended
overhaul procedures.
Note
Calibration, maintenance and repair services for are offered by DHI
Authorized Service Providers (see Section 7.4).
Caution
•
is a sophisticated measuring instrument with advanced on-board
features and functions. Before assuming that unexpected behavior is
caused by a system defect or breakdown, use this manual and other
training facilities to become thoroughly familiar with operation.
For rapid assistance in specific situations and other troubleshooting
information, see Section 6.
•
is covered by a limited 1 year warranty (see Section 7.4).
Unauthorized service or repair during the warranty period is undertaken at
the owner's risk and may cause damage that is NOT covered under product
warranty and/or may void the product warranty.
