A.4 | Setting Range Values (Local Zero and Span), Continued | |||||||||||
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Procedure, continued |
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| Table |
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| Setting Range Values Using Local Zero and Span | |||||||
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| Adjustments, Continued |
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| Step |
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| Action |
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| 7 | Using an accurate pressure source, apply pressure equivalent to |
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| desired upper range value to transmitter. |
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| ATTENTION | For differential pressure transmitters, apply pressure |
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| to the high pressure head and be sure that the pressure to the low |
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| pressure head is at its reference value. |
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| 8 | Check that milliammeter reading is 20 mA. |
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| If reading … |
| Then… |
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| is not exactly 20 mA |
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| is correct |
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| ATTENTION | If you have the smart meter with local zero and |
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| span adjustment option, you may substitute the smart meter readings |
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| for the milliammeter readings. For example, with URV input pressure |
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| applied assume that the meter reads 396 inH2O instead of 400 |
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| inH2O. In this case, the meter reading is less than 100% (or 20 mA). |
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| 9 | a. Press and hold SPAN button on local zero and span assembly or |
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| smart meter. |
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| ATTENTION | The smart meter readings revert to the default unit of |
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| percent (%) during this operation. If the error code Er0 appears on |
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| the display, you are working with a model STD110 transmitter that |
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| does not support the local zero and span adjustments. If the error |
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| code Er4 appears, you are trying to set a SPAN value that is outside |
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| acceptable limits for your transmitter. Readjust applied pressure to |
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| be within acceptable range limits and repeat this procedure. |
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| b. |
| Press Increase button once to complete this function. |
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| ATTENTION | The smart meter display goes blank for a 1/2 |
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| second and then returns reading 100%. |
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| c. Check that milliammeter reading equals 20 mA and release SPAN |
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| button. |
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| ATTENTION | If milliammeter reading doesn’t change, be sure you |
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| are not working with a model STD110 transmitter that ignores local |
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| adjustments. The smart meter readings return to the set engineering |
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| units after you release the SPAN button. |
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| Continued on next page | ||
2/05 | ST 3000 Release 300 Installation Guide | 57 |