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34-ST-03-64
Page 6
Performance Under Rated Conditions * - Model STR12D (0-10 to 0-400 inH
2
O)
Parameter Description
Upper Range Limit ** inH2O
mbar
400 (39.2°F/4°C is standard reference temperature for inH
2
O range.)
1000
Minimum Span inH2O
mbar
10 Note: Recommended minimum span in square root mode is 20 inH
2
O (50 mbar).
25
Turndown Ratio
40 to 1
Zero Elevation and Suppression
No limit except minimum span within ±100% URL.
Accuracy (Reference – Includes
combined effects of linearity,
hysteresis, and repeatability)
• Accuracy includes residual error
after averaging successive
readings.
• For F
OUNDATION Fieldbus use
Digital Mode specifications. For
HART use Analog Mode
specifications.
In Analog Mode: ±0.2% of calibrated span or upper range value (URV), whichever is
greater, terminal based.
For URV below reference point (50 inH
2
O), accuracy equals:
±0.1 + 0.1
⎝
⎛
⎠
⎞
50 inH
2
O
span inH
2
O
or ±0.1 + 0.1
()
125 mbar
span mbar
in % of span
In Digital Mode: ±0.175% of calibrated span or upper range value (URV), whichever is
greater, terminal based.
For URV below reference point (50 inH
2
O), accuracy equals:
±0.075 + 0.10
⎝
⎛
⎠
⎞
50 inH
2
O
span inH
2
O
or ±0.075 + 0.10
()
125 mbar
span mbar
in % of span
Combined Zero and Span
Temperature Effect per 28°C
(50°F) ***
In Analog Mode: ±1.2% of span.
For URV below reference point (200 inH
2
O), effect equals:
±0.2 + 1.0
200 in H
2
O
span in H
2
O
⎝
⎛
⎠
⎞
or ±0.2 + 1.0
500 mbar
span mbar
⎝
⎛
⎠
⎞
In % span±0.2 + 1.0
200 in H
2
O
span in H
2
O
⎝
⎛
⎠
⎞
200 in H
2
O
span in H
2
O
⎝
⎛
⎝
⎛
⎠
⎞
⎠
⎞
or ±0.2 + 1.0
500 mbar
span mbar
⎝
⎛
⎠
⎞
500 mbar
span mbar
⎝
⎛
⎝
⎛
⎠
⎞
⎠
⎞
In % span
In Digital Mode: ±1.175% of span.
For URV below reference point (200 inH
2
O), effect equals:
±0.175 + 1.0
200 in H
2
O
span in H
2
O
⎝
⎛
⎠
⎞
or ±0.175 + 1.0
500 mbar
span mbar
⎝
⎛
⎠
⎞
In % span
±0.175 + 1.0
200 in H
2
O
span in H
2
O
⎝
⎛
⎠
⎞
200 in H
2
O
span in H
2
O
⎝
⎛
⎝
⎛
⎠
⎞
⎠
⎞
or ±0.175 + 1.0
500 mbar
span mbar
⎝
⎛
⎠
⎞
500 mbar
span mbar
⎝
⎛
⎝
⎛
⎠
⎞
⎠
⎞
In % span
* Performance specifications are based on reference conditions of 25°C (77°F), zero (0) static pressure, 10 to 55% RH, and
316L Stainless Steel barrier diaphragm.
** Transmitter URL limit or maximum seal pressure rating, whichever is lower.
*** Specification applies to transmitters with 2 seals only. Apply 1.5 times factor to temperature effect for capillary lengths greater than 10
feet.