Emerson Rosemount 644h Handbuch PDF herunterladen (Seite 9)

1-3

Rosemount Inc

Appendix B: Hazardous Locations Certifications

• Hazardous locations certifications

• Installation drawings

Appendix C: Model 644 and 244E Manual Supplement

• Comparison between new and old Models 644 and 244E

• Specifications

CONSIDERATIONS

General

Electrical temperature sensors such as RTDs and thermocouples produce low-level

signals proportional to their sensed temperature. The Model 644 converts the low-

level sensor signal to a standard 4–20 mA signal that is relatively insensitive to

lead length and electrical noise. This current signal is then transmitted to the

control room via two wires.

Mechanical

When choosing an installation location and position, take into account the need for

access to the transmitter.

Wiring Connections

Make wiring connections through the cable entry in the side of the connection

head. Be sure to provide adequate clearance for

cover removal.

Electrical

Proper electrical installation is necessary to prevent errors due to sensor lead

resistances and electrical noise. Shielded cable should be used in electrically noisy

environments.

Environmental

The transmitter electronics module is permanently sealed within the housing,

resisting moisture and corrosive damage. Verify that the operating atmosphere of

the transmitter is consistent with the appropriate hazardous locations

certifications.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 67 68

Keine Kommentare

Emerson Rosemount 644h Handbuch Seite 9