7NG4142-8AA SIEMENS

7NG4142-8AA SIEMENS Basis unit

Product  Description：

The SITRANS TH300 (7NG4142-8AA) is a two-wire device that combines high accuracy with a versatile communication interface. It is typically installed in the connection head (Form B) of a temperature sensor. Its core functionality involves sensing a temperature-dependent electrical signal and transforming it into a linear-to-temperature current signal. Because it utilizes HART 7, it allows for remote configuration, detailed diagnostics, and integration into asset management systems like SIMATIC PDM.

Product Parameters

The technical specifications of the 7NG4142-8AA highlight its industrial-grade capabilities:

• Input Types: Supports RTDs (e.g., Pt100, Pt500, Pt1000, Ni100), Thermocouples (Types B, E, J, K, L, N, R, S, T, U), Resistance-type sensors ($0 \text{ to } 2200 \text{ }\Omega$), and Millivolt signals ($-10 \text{ to } +1100 \text{ mV}$).

• Output Signal: $4 \text{ to } 20 \text{ mA}$ current loop, 2-wire system.

• Communication Protocol: HART version 7.

• Accuracy: Error is typically $\le 0.1\%$ of the programmed span for RTD inputs.

• Supply Voltage: Operates between $11 \text{ and } 35 \text{ VDC}$ ($30 \text{ VDC}$ for intrinsically safe versions).

• Isolation Voltage: $1500 \text{ VAC}$ between input and output.

• Operating Temperature: Range of $-40^{\circ}\text{C}$ to $+85^{\circ}\text{C}$ ($-40^{\circ}\text{F}$ to $+185^{\circ}\text{F}$).

• Approvals: ATEX, IECEx, and FM approvals for use in hazardous areas (Intrinsically Safe).

Product Advantages

• High Accuracy and Stability: The 1:1 conversion of signals ensures minimal drift over time, providing precise data for critical process control.

• Universal Application: By supporting multiple sensor types in a single unit, it reduces the need for stocking multiple transmitter models, thereby lowering inventory costs.

• Enhanced Diagnostics: Through the HART protocol, the device provides status information such as sensor breakage, short circuits, or "out of range" errors, which facilitates predictive maintenance.

• Compact Design: The small form factor allows for easy mounting in the standard Form B connection head or on a DIN rail using an optional adapter.

• Galvanic Isolation: The high isolation voltage protects the control system from electrical interference and ground loops.

Important Considerations and Precautions

• Explosion Protection: When using the device in hazardous areas, ensure the specific Ex-rating on the nameplate matches the zone requirements of the installation site.

• Proper Grounding: To minimize electromagnetic interference (EMI), ensure that the shield of the signal cable is grounded according to industry standards.

• Load Resistance: The maximum allowable load resistance in the output loop depends on the supply voltage. Ensure the loop can support the resistance of the cables and any connected indicators.

• Configuration Tools: While it can be programmed via HART, you will need a HART modem and software like SITRANS mobile IQ or SIMATIC PDM for full parameterization.

• Installation Environment: Avoid installing the transmitter in areas with extreme vibration or direct proximity to high-voltage equipment unless additional shielding and damping measures are taken.

Product Applications

The 7NG4142-8AA is widely utilized across several heavy industries due to its reliability and HART capabilities:

• Chemical and Petrochemical: Monitoring reactor temperatures and distillation columns where precision and safety certifications are mandatory.

• Power Generation: Measuring steam temperatures and bearing temperatures in turbines and generators.

• Food and Beverage: Temperature monitoring in pasteurization, brewing, and storage where sanitary conditions and high-accuracy measurements are required.

• Oil and Gas: Use in refineries and offshore platforms for pipeline temperature monitoring and gas processing.

• Water and Wastewater: Monitoring temperatures in treatment processes and chemical dosing systems.

The structure and details of the product：

Our services：

Shipping Port:  China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

Warranty: one year

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