
A-3
EN
Rosemount Inc
Performance
The Model 644 transmitters maintain a specification conformance of at least 3σ.
Accuracy
Table A-6. Model 644 Input Options and Accuracy.
Sensor
Options
Sensor Reference Input Ranges
Recommended
Min. Span
(1)
Digital
Accuracy
(2)
D/A
Accuracy
(3)
2-, 3-, 4-Wire RTDs
°C °F °C °F °C °F
Pt 100
IEC 751, 1995
(α = 0.00385)
–200to
850
–328to
1562
10 18 ±0.15 ±0.27 ±0.03%
of span
PT 100
JIS 1604, 1981
(α = 0.003916)
–200to
645
–328to
1193
10 18 ± 0.15 ± 0.27 ±0.03%
of span
Pt 200
IEC 751, 1995
(α = 0.00385)
–200to
850
–328to
1562
10 18 ±0.27 ±
0.49
±0.03%
of span
Pt 500
IEC 751, 1995
(α = 0.00385)
–200to
850
–328to
1562
10 18 ± 0.19 ± 0.34 ±0.03%
of span
Pt 1000
IEC 751, 1995
(α = 0.00385)
–200to
300
–328to
572
10 18 ±0.19 ±0.34 ±0.03%
of span
Ni 120
Edison Curve
No. 7
–70 to
300
–94 to
572
10 18 ± 0.15 ± 0.27 ±0.03%
of span
Cu 10
Edison Copper
Winding No. 15
–50 to
250
–58 to
482
10 18 ±1.40 ±2.52 ±0.03%
of span
Thermocouples
(4)
Typ e B
(5)
NIST Monograph
175, IEC 584
100 to
1820
212 to
3308
25 45 ±0.77 ±1.39 ±0.03%
of span
Typ e E
NIST Monograph
175, IEC 584
–50 to
1000
–58 to
1832
25 45 ± 0.20 ± 0.36 ±0.03%
of span
Typ e J
NIST Monograph
175, IEC 584
–180to
760
–292to
1400
25 45 ±0.35 ±0.63 ±0.03%
of span
Typ e K
(6)
NIST Monograph
175, IEC 584
–180to
1372
–292to
2502
25 45 ± 0.50 ± 0.90 ±0.03%
of span
Typ e N
NIST Monograph
175, IEC 584
–200to
1300
–328to
2372
25 45 ±0.50 ±0.90 ±0.03%
of span
Typ e R
NIST Monograph
175, IEC 584
0to
1768
32 to
3214
25 45 ± 0.75 ± 1.35 ±0.03% of
span
Typ e S
NIST Monograph
175, IEC 584
0to
1768
32 to
3214
25 45 ±0.70 ±1.26 ±0.03% of
span
Typ e T
NIST Monograph
175, IEC 584
–200to
400
–328to
752
25 45 ± 0.35 ± 0.63 ±0.03% of
span
DIN
Typ e L
DIN 43710 –200to
900
–328to
1652
25 45 ±0.35 ±0.63 ±0.03% of
span
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