Siemens 7MF4033 series, Руководство пользователя

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UMSITRPDS3-1 Calibration And Maintenance
November 2010
7-3
Calibration Procedure Section References
Calibration Needed Local (Pushbutton) HART Communicator
Position-induced zero Section 6.2.5 Section 6.4.4
On-line zero Section 6.2.2 Section 6.4.2
Calibrate DAC --- Section 6.4.14
This completes calibration of the transmitter.
7.2 PREVENTIVE MAINTENANCE
Preventive maintenance consists of periodic inspection of the transmitter, cleaning the external surface of
the transmitter enclosure, draining condensate from conduit, and blowing-down or purging impulse
piping to keep them free of sediment. Perform preventive maintenance at regularly scheduled intervals.
7.2.1 Transmitter Exterior Inspection
The frequency of the inspection will depend on the severity of the transmitter’s environment.
1. Inspect the exterior of the transmitter enclosure for accumulated oil, dust, dirt, and especially any
corrosive process over-spray.
2. Check that both enclosure caps are fully threaded onto the enclosure, compressing the O-ring between
the cap and the enclosure. The O-ring must not be cracked, broken, or otherwise damaged.
3. Inspect the display viewing glass for cleanliness and damage. Replace the enclosure cap assembly if
the glass is damaged or missing.
4. Inspect both enclosure electrical conduit entrances for possible moisture leaks. An unused conduit
entrance must be plugged and sealed. Inspect the cable clamps of all watertight cable conduits for
loose clamps and deteriorated sealing material. Tighten clamps and reseal as necessary.
5. Inspect conduit drain seals for obstructions.
6. Inspect transmitter and mounting bracket hardware for tightness. Tighten loose hardware as
necessary. Consider steps to reduce vibration.
7. Inspect process connection blocks for evidence of leakage at the impulse pipe connections and at the
block interface to the transmitter end caps. As necessary, add sealant to pipe threads, tighten block
bolts, and replace block Teflon® seals.
7.2.2 Transmitter Exterior Cleaning
After an exterior inspection of the transmitter, the enclosure can be cleaned with the transmitter operating.
1. Clean the enclosure (except enclosure cap glass) and process manifold with a mild, nonabrasive liquid
detergent, and a soft bristle brush, sponge, or cloth. Rinse the weatherproof enclosure with a gentle
spray of water.
Remove an excessive accumulation of process residue. Hot water or air may be used to flush away process
residue if the temperature of the cleaning medium does not exceed the operating temperatures of the transmitter
as listed in Section 9.3 Specifications.
2. Clean enclosure cap glass with a mild, nonabrasive liquid cleaner and a soft, lint-free cloth.