Emerson Rosemount 644h Handbuch PDF herunterladen (Seite 42)

A-6

Rosemount Inc

Temperature Effects Example

When using a Pt 100 (α = 0.00385) sensor input with a 0–100 °C span at 30 °C

ambient temperature:

RTDs and thermocouples have a stability of ±0.1% of reading or 0.1 °C (whichever

is greater) for twelve months.

Power Supply Effect

Less than ±0.005% of span per volt

Vibration Effect

The Model 644H and Model 644R are tested to the following specifications with no

effect on performance:

Digital Temperature Effects: 0.003 °Cx(30– 20) = 0.03 °C

D/A Effect: [0.001% of 100] x (30 – 20) = 0.01 °C

Worst Case Error: Digital + D/A + Digital Temperature Effects + D/A Effects = 0.15 °C

+0.03°C+0.03°C+0.01°C = 0.22 °C

Tot al P ro ba bl e Er ro r:

Frequency Vibration

10–60 Hz 0.21 mm peak displacement

60–500 Hz 3 g peak acceleration

0.15

0.03

0.01

+ + + 0.16°C=

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Emerson Rosemount 644h Handbuch Seite 42