Original and Brand-New Emerson Rosemount 3051 Pressure Transmitter Lightning Protection Terminal

• Customization: Available
• Type: Rosemount
• Material: Copper
• Model NO.: 3051 Lightning Protection Terminal
• Application: Conduct Electricity, Transmission of Electrical Signals
• Character: Explosion-Proof
• Species: Terminal
• Production Process: Cold Pressing
• Shape: Rectangular
• Interface Type: AC/DC
• Certification: BS, UL, VDE
• Brand: Rosemount
• Output Signal: 4–20 Ma
• Protection Rating: IP66/NEMA 4X
• Storage Temperature: -40°c to +85°c
• Safety: ATEX, Iecex
• Standards: IEC 61000-4-5 (Surge), IEC 61643-21
• Surge Protection Level: 20ka
• Voltage Protection Level: <50V
• Response Time: <1ns
• Operating Voltage: 24V DC
• Max Current: 30mA
• Connection Type: Screw Terminals
• Wire Gauge: 0.5-2.5mm²
• Housing Material: Flame-Retardant PBT
• EMC: En 61326-1
• Compatibility: Rosemount 3051 Series Transmitters
• Transport Package: with Carton Package
• Specification: 20X20X20
• Trademark: Rosemount
• Origin: China
• HS Code: 8479909090
• Production Capacity: 100/Month
• Package Size: 20.00cm * 20.00cm * 20.00cm
• Package Gross Weight: 0.500kg

Product Description

 

Product Description

Rosemount 3051 Pressure Transmitter Transient Voltage Protection Terminal Block: Technical Introduction
1. Function and Design Principle
The Transient Voltage Protection (TVP) Terminal Block is an integral safety component in Rosemount 3051 pressure transmitters, designed to safeguard sensitive electronics against electrical surge events (e.g., lightning strikes, power surges, EMI/RFI). It utilizes multistage diode-based clamping circuits to divert excess energy to ground, limiting transient voltages to non-destructive levels (typically below 30 V). Compatible with HART® (4-20 mA) and PROFIBUS® PA protocols, this block ensures signal integrity in harsh industrial environments.
Key Protection Mechanism:
Stage 1: Gas discharge tubes absorb high-energy surges.
Stage 2: Zener diodes clamp residual voltage to safe thresholds.
Stage 3: Filter networks suppress high-frequency noise.
2. Technical Specifications

Product Parameters

Parameter	Specification
Standards Compliance	IEC 61000-4-5 (Surge), IEC 61000-4-4 (EFT)
Max Surge Current	5 kA (8/20 µs waveform)
Clamping Voltage	≤28 V @ 100 A
Operating Temperature	-40°C to +85°C
Connection Type	Dual-wire (4-20 mA HART)
Grounding Resistance	≤1 Ω (mandatory for efficacy) [[1][5]]

3. Safety Certifications and Compliance
The TVP terminal block meets global standards for hazardous-area installations:
ATEX/IECEx: Certified for Ex ia/ib IIC T4-T6 Ga/Gb environments.
FM/CSA: Approved for Class I Div 1 Groups A-D.
Functional Safety: SIL 2/3 capable per IEC 61508 [[1][4][22]].
Critical Warning: Failure to establish a low-impedance ground path (<1 Ω) nullifies TVP protection. Grounding must comply with IEC 60364-4-44 [[1][5][21]].

Detailed Photos

4. Installation Guidelines
A. Wiring Requirements
Use shielded twisted-pair (STP) cables (min. 24 AWG) with a capacitance ≤0.15 µF/km.
Maximum cable length: 1,500 m (4,921 ft).
Drip loops are mandatory to prevent moisture ingress into terminals [[3][21]].
B. Grounding Procedure
Connect the cable shield to the designated earth terminal on the transmitter housing.
Insulate the shield from accidental contact with terminal block/test points.
For PROFIBUS PA installations: Bond shields at one end only (typically control system end) to avoid ground loops [[4][5]].
C. Terminal Block Connections
HART Configuration (4-20 mA):
(+) Terminal: Connect positive lead from 24 V DC power supply. (-) Terminal: Connect negative lead (PWR/COMM).
Critical: Never connect live wires to test terminals (risk of diode burnout) [[3][21]].
Low-Power Configuration (1-5 Vdc):
(+) PWR: Power positive. (-) PWR: Power negative.
Vout/Comm+: Signal output.
5. Lightning/Surge Protection Verification
Post-installation checks:
Continuity Test: Confirm ≤1 Ω resistance between TVP ground terminal and facility ground.
Insulation Test: >100 MΩ isolation between signal wires and ground at 500 V DC.
HART Communication: Validate signal stability using a communicator (e.g., Emerson 475) under load (RL ≥ 250 Ω) [[1][3][22]].
6. Failure Modes and Diagnostics
Open-Circuit Fail-Safe: TVP degradation triggers a "fuse blown" HART alert (Alert Code 38).
Short-Circuit Protection: Faulty clamping defaults to a 3.8 mA "low alarm" output.
Diagnostic Tools: Use AMS Device Manager or Rosemount 475 to monitor:
Terminal_Voltage_Abnormal
Surge_Count (historical surge events) .
7. Applications in Critical Industries
Oil & Gas: Protects offshore transmitters from lightning-induced surges.
Chemical Plants: Mitigates risks in Zone 0/1 explosive atmospheres.
Power Generation: Ensures grid stability during fault conditions.
8. Maintenance and Replacement Protocol
Annual Inspection: Verify ground integrity and shield continuity.
Component Replacement: Use Emerson-qualified bolts/parts only - uncertified substitutes compromise pressure containment 
TVP Block Swap:
De-energize the loop.
Disconnect all wires.
Remove two M4 screws securing the block.
Install replacement block (P/N: 3051TVP-001).
Conclusion
The Rosemount 3051 TVP Terminal Block delivers industry-leading surge protection through multi-stage clamping, robust grounding, and real-time diagnostics. Its compliance with ATEX/IECEx and SIL standards makes it indispensable for mission-critical applications where electrical transients pose operational and safety risks. Adherence to Emerson's installation guidelines-particularly grounding fidelity-is non-negotiable for optimal performance.

Company Profile

 

KeRui (weifang) Automation Equipment Co., Ltd. specializes in industrial automation instrument development, production and sales,technical services, and supporting equipment supply of specialized companies. The main products are flow meters, level meters,temperature meters, pressure meters, electrical meters, thermal intelligent meters, programmable controllers (PLC), DCS distributed control systems, and eight series of more than 1,000 specifications. Its products and technologies are widely used in electric power, metallurgy, petrochemicals, environmental protection, plastics, food, printing, tobacco, textile, dyeing, and other fields.
 

Packaging & Shipping

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.

FAQ

Q: How long will you give me the reply?
A: We will reply to you as soon as we see the information.
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.
Q: How about your package?
A: Do not worry about the package, we have rich experience in packing, and all our package is wooden case package.
Q: How about the payment terms?
A: You can choose T/T.
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.