Emerson Rosemount 644h Manuál stáhnout pdf (Strana 40)

A-4

Rosemount Inc

Accuracy Example

When using a Pt 100 (α = 0.00385) sensor input with a 0 to 100 °C span: Digital

accuracy would be ±0.15 °C, D/A accuracy would be ±0.03% of 100 °C or ±0.03 °C,

Total = ±0.18 °C.

DIN

Typ e U

DIN 43710 –200to

600

–328to

1112

25 45 ± 0.35 ± 0.63 ±0.03% of

span

Typ e

W5Re/

W26Re

ASTM E 988–96 0to

2000

32 to

3632

25 45 ±0.70 ±1.26 ±0.03% of

span

Millivolt

Input

–10 to 100 mV 3 mV ±0.015 mV ±0.03% of

span

2-, 3-, 4-Wire Ohm Input

0 to 2000 ohms 20 ohm ±0.45 ohm ±0.03% of

span

(1) No minimum or maximum span restrictions within the input ranges. Recommended minimum span will hold

noise within accuracy specification with damping at zero seconds.

(2) Digital accuracy: Digital output can be accessed by HART Communicator or Rosemount control system.

(3) Total Analog accuracy is the sum of digital and D/A accuracies.

(4) Total digital accuracy for thermocouple measurement: sum of digital accuracy +0.5 °C

(5) Digital accuracy for NIST Type B T/C is ±3.0 °C from 100 to 300 °C.

(6) Digital accuracy for NIST Type K T/C is ±0.70 °Cfrom–292 to –130 °F(–180 to –90 °C).

Sensor

Options

Sensor Reference Input Ranges

Recommended

Min. Span

(1)

Digital

Accuracy

(2)

D/A

Accuracy

(3)

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 ... 67 68

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