34-ST-03-64 Page 6
Performance Under Rated Conditions * - Model STR12D
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Upper Range Limit ** | inH2O | 400 (39.2°F/4°C is standard reference temperature for inH2O range.) | ||||||||||||||||
| mbar | 1000 |
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Minimum Span | inH2O | 10 Note: Recommended minimum span in square root mode is 20 inH2O (50 mbar). | ||||||||||||||||
| mbar | 25 |
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Turndown Ratio |
| 40 to 1 |
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Zero Elevation and Suppression | No limit except minimum span within ±100% URL. |
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Accuracy (Reference – Includes | In Analog Mode: ±0.2% of calibrated span or upper range value (URV), whichever is | |||||||||||||||||
combined effects of linearity, | greater, terminal based. |
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hysteresis, and repeatability) | For URV below reference point (50 inH2O), accuracy equals: | |||||||||||||||||
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• Accuracy includes residual error | ±0.1 + 0.1 ⎛ | 50 inH2O | ⎞ | or ±0.1 + 0.1 |
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| 125 mbar |
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after averaging successive |
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readings. |
| ⎝ span inH2O⎠ |
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• For FOUNDATION Fieldbus use | In Digital Mode: ±0.175% of calibrated span or upper range value (URV), whichever is | |||||||||||||||||
Digital Mode specifications. For | greater, terminal based. |
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HART use Analog Mode |
| For URV below reference point (50 inH2O), accuracy equals: | ||||||||||||||||
specifications. |
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| ⎛ 50 inH2O |
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| 125 mbar | |||||
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| ±0.075 + 0.10 | ⎝ |
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| ⎠ or ±0.075 + 0.10 ( |
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| span inH2O | span mbar | |||||||||||||||
Combined Zero and Span | In Analog Mode: ±1.2% of span. |
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Temperature Effect per 28°C | For URV below reference point (200 inH2O), effect equals: | |||||||||||||||||
(50°F) *** |
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| ⎛ | 200 in H2O |
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| ⎛ 500 mbar | ⎞ | ||||||||
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| ±0.2 + 1.0 ⎝ |
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| ⎠ or ±0.2 + 1.0 | ⎝ |
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| ⎠ In % span | |||||
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| span in H2O |
| span mbar | |||||||||||||
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In Digital Mode: ±1.175% of span.
For URV below reference point (200 inH2O), effect equals:
| ⎛ | 200 in H2O ⎞ | ⎛ | 500 mbar ⎞ | |||
±0.175 + 1.0 | ⎝ |
| ⎠ or ±0.175 + 1.0 | ⎝ | span mbar | ⎠ In % span | |
span in H2O | |||||||
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*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.
