Rosemount 3051 model code: sensor range versus calibrated span
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Rosemount 3051 range and model code
A Rosemount 3051 model code identifies an ordered hardware configuration. The configured lower and upper range values describe the measuring span in service. Record both: a range number in the model code does not tell you the current 4 mA and 20 mA pressure settings.
Keep the hardware code and range settings together
| Item | What to check |
|---|---|
| Nameplate record | Complete model, serial identification and pressure reference. Retain every suffix. |
| Configuration record | Pressure units, lower range value (LRV), upper range value (URV) and transfer function. |
| Application requirement | Required operating span and pressure conditions, checked against the limits for that sensor. |
| Documentation | Applicable data-sheet revision and the calibration record, if required. |
Use Emerson’s ordering and sensor-limit tables for the specific family and output version. Sensor limits, allowed configured span and overpressure limits answer different questions; do not use an overpressure figure as a measuring-range rating.
Source: Emerson Rosemount 3051 product data sheet, October 2025. Match the document to the full model and revision on your unit.
A span calculation for a clearly defined example
Consider an illustrative transmitter configuration with a linear 4 to 20 mA pressure output, LRV = 0 psig and URV = 150 psig. The configured span is 150 psi. At 75 psig, the ideal linear output is 12 mA: 4 + 16 × (75 - 0) ÷ (150 - 0).
This is a calculation example, not a reading from an offered transmitter. It assumes linear output and excludes diagnostic, alarm or multidrop behavior. Check the actual device configuration before using that relationship in a loop test.
Do not decode a shortened title as a complete model
For 3051TG4A2B21AK6M5, the dedicated model guide keeps the exact hardware discussion in one place. When reviewing another 3051, use its own complete code and the matching Emerson ordering table. A supplier title can omit options that appear on the nameplate.
Ask for a fresh label photograph when a quotation and product photo disagree. Write down unresolved fields instead of copying an assumed value into the purchase order.
Prepare a range record that survives the replacement
- Installed full model and pressure reference.
- Current units, LRV, URV and transfer function, captured before removal when possible.
- Required replacement settings and the person authorized to approve them.
- Reference equipment and acceptance criteria for the commissioning check.
Check the listed part
Send the complete model label and current LRV/URV record when comparing the 3051TG4A2B21AK6M5 listing.
Manufacturer references
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