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| Type: | Rosemount |
| Material: | Copper |
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Rosemount™ 3051 Pressure Transmitter: Wiring Terminal Product Introduction
1. Overview and Safety Warnings
The Rosemount 3051 series is an industry-standard pressure, level, and flow measurement transmitter renowned for reliability and precision. Its terminals support 4-20 mA HART®, 1-5 Vdc Low Power, and PROFIBUS® PA protocols. Safety is paramount due to risks of explosion, electrical shock, and process leaks:
Explosion Hazard: Do not remove covers in explosive atmospheres while powered. Install per ATEX/IECEx standards
Electrical Shock: Terminals may carry high voltage. Avoid contact with leads during operation
Process Leaks: Tighten process connectors before pressurization. Use only validated O-rings for flange adapters
2. Electrical Specifications
Power Supply:
4-20 mA HART: 10.5-42.4 Vdc, with ≤2% ripple.
1-5 Vdc Low Power: 6-14 Vdc, Vout load ≥100 kΩ
Loop Resistance: Minimum 250 Ω for HART communication
Cabling:
Type: Shielded twisted pair (24 AWG or larger).
Length: ≤5,000 ft (1,500 m).
Drip Loop: Mandatory to prevent moisture ingress; position below conduit entry .
3. Terminal Block Structure
3.1. Physical Layout
Terminals are housed in a compartment under the removable cover. Labels are laser-etched for durability:
4-20 mA HART Terminals:
+ (PWR/COMM+): Positive power/communication.
- (PWR/COMM-): Negative return
1-5 Vdc Low Power Terminals:
+ PWR: Power input (+).
PWR-: Power return (-).
Vout/comm+: Voltage output/HART+
Test Terminals:
Warning: Never connect powered signals-may damage test diodes
3.2. Transient Voltage Protection
Terminal blocks include transient voltage protection.
Critical: Transmitter must be grounded; otherwise, protection is void .
| Parameter | Specification | Remarks |
| Output Types | 4-20 mA HART or 1-5 Vdc HART (low power) | Selectable via wiring configuration |
| Terminal Identification | 4-20 mA HART: + (PWR/COMM), - (PWR/COMM) - 1-5 Vdc HART: + PWR, - PWR, Vout/comm+ | For 1-5 Vdc, signal wire connects to Vout/comm+; power wires to + PWR and - PWR |
| Power Supply | - 4-20 mA HART: 10.5-42.4 Vdc - 1-5 Vdc HART: 6-14 Vdc | Power ripple must be <2% For HART communication, loop resistance ≥250 Ω is required |
| Wiring Specifications | - Cable Type: Shielded twisted pair - Wire Gauge: ≥24 AWG - Max Length: 1,500 m (5,000 ft) | Drip loops mandatory; bottom of loop must be below conduit entry |
| Grounding Requirements | - Transmitter chassis grounded per local regulations - Cable shield: Insulated from transmitter housing, bonded to next shield (if via junction box), and connected to power supply ground | Essential for transient voltage protection |
| Safety Warnings | - Explosive Atmospheres: Do not remove cover when powered . - Test Terminals: Never connect live signals (damages diodes) . - Nuclear Applications: Not rated for nuclear use; non-compliance causes measurement errors |
Certification compliance (e.g., IECEx, ATEX) required for hazardous areas |
4. Wiring Procedure
Follow these steps to ensure safety and compliance:
De-energize: Disable power in hazardous areas before removing the cover.
Terminal Access:
Remove the field-side cover.
Verify O-ring integrity to maintain weatherproofing (IP66/IP67)
Connect Wires:
4-20 mA HART:
Positive wire → + terminal.
Negative wire → - terminal.
1-5 Vdc:
Positive power → + PWR.
Negative power → PWR-.
Signal wire → Vout/comm+
Grounding:
Secure the housing to facility ground per local codes.
Shield must be:
Insulated from transmitter housing.
Continuous to the power supply ground .
Conduit Sealing:
Seal unused entries with NPT/M20 plugs.
Install drip loops below conduit entry points
5. Grounding for Hazardous Areas
Intrinsic Safety (IS):
Use IS barriers; ensure loop impedance ≤20 Ω at 1,200 Hz for multi-transmitter systems
Explosion-Proof Installations:
Conduit entries must be Ex-certified.
Ambient temperature limits apply for process connections >185°F (85°C) (see Table 1)
Table 1: Temperature Limits for Hazardous Areas
| Process Temp (°F) | Max Ambient Temp (°F) |
| ≤185 | 158 |
| 185-250 | 60-158 (reduced 1:1.5) |
6. Diagnostics and Troubleshooting
HART Communication Issues:
Verify loop resistance ≥250 Ω.
Check for EMI sources (e.g., parallel power cables).
Output Faults:
Use test terminals (de-energized) for mA validation
Diagnostic LEDs:
LCD display (optional) shows loop current, alerts, or HART status
7. Maintenance Best Practices
Terminal Inspection:
Annually check for corrosion, loose connections, or shield damage.
Replacement Parts:
Use only Emerson-supplied bolts and O-rings to maintain pressure containment
Software Updates:
Ensure Device Drivers (DD/DTM) are updated via
8. Compliance and Certifications
Global Standards:
ATEX, IECEx, FM, CSA, INMETRO.
Safety Integrity Levels (SIS):
SIL 2/3 compliant per IEC 61508
Conclusion
The Rosemount 3051's terminals integrate robust electrical design with stringent safety protocols, ensuring reliable operation in critical applications. Adherence to wiring guidelines, grounding, and environmental limits is essential for optimal performance. For detailed schematics or protocol-specific diagrams, consult the Rosemount 3051 Reference Manual (00809-0106-4007)
The packaging and transportation of instrumentation in global trade hinges on a synergy of advanced materials, rigorous testing, regulatory compliance, and smart logistics. By adopting hybrid structural designs, leveraging real-time monitoring technologies, and prioritizing sustainability, exporters can ensure the safe, efficient, and cost-effective delivery of precision instruments. Continuous innovation in materials science and IoT integration will further redefine industry standards, enhancing resilience in an increasingly interconnected market.
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Q: What is the delivery time?
A: Our delivery time is within 3-7 days after we get your payment;
for large qty mass orders, the time should be confirmed again for you.
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A: Do not worry about the package, we have rich experience in packing, and all our package is wooden case package.
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Q: Do you provide samples?
A: Yes, we have materials in stock to help you to get the samples as soon as we can.
Q: What is the MOQ?
A:1PC.
Q: Can I get a lower price if I order large quantities?
A: Yes, cheaper prices with more bigger size orders.
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