Rosemount 848T Dokumentacja Pobierz pdf (Strona 71)

Reference Manual

00809-0100-4697, Rev GA

Appendix A: Reference Data

November 2014

Reference Data

A.4.11 Ambient temperature notes

Examples

When using a Pt 100 (α = 0.00385) sensor input at 30 °C ambient temperature:

 Digital Temperature Effects: 0.003 °C x (30 - 20) = 0.03 °C

 Worst Case Error: Digital + Digital Temperature Effects = 0.3 °C + 0.03 °C = 0.33 °C

 Total Probable Error

Type R, Type S

•0.016 °C

• 0.023 °C - (0.0036% of R)

•R ≥ 200

•R < 200

Type T, DIN Type U

• 0.0064 °C

• 0.0064 °C + (0.0043% of |R|)

•R ≥ 0

•R < 0

GOST Type L

•0.007 °C

• 0.007 °C + (0.003% of IRI)

•R ≥ 0

•R < 0

Millivolt

• 0.0005 mV

N/A

2- and 3-wire ohm

• 0.0084 ohms

N/A

4–20 mA (Rosemount)

• 0.0001 mA

N/A

4-20 mA (NAMUR)

• 0.0001 mA

N/A

(1) Change in ambient is in reference to the calibration temperature of the transmitter (20 °C (68 °F) typical from the factory).

NIST type Accuracy per 1.0 °C (1.8 °F) change in ambient temperature

(1)

°C Temperature range (°C)

0.30

0.03

+0.30°C=

1 2 ... 66 67 68 69 70 71 72 73 74 75 76 ... 135 136

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