SIEMENS 7NG4142-8AA Pressure Transmitter
Brand：SIEMENS
model：7NG4142-8AA
Warranty: 12 months
Lead Time：3-day working day
Country of origin: USA Price: Please contact us
Product weight：0.44kg
Shipping Port: China
Payment: Bank of Chicago, Bank of Singapore
SIEMENS 7NG4142-8AA Pressure Transmitter
1. Product Description
The SITRANS TH300 (7NG4142-8AA) acts as a bridge between temperature sensors (RTDs or Thermocouples) and the control system. It converts the sensor signal into a stable, noise-immune 4 to 20 mA current signal.
Communication: HART 7 protocol.
Mounting: Designed for Head Mounting (Type B).
Galvanic Isolation: High electrical isolation between input and output to ensure signal integrity and safety.
2. Technical Parameters
| Feature | Specification |
| Input Type | Universal (Resistance thermometers, Thermocouples, Resistance-type sensors, DC voltage signals) |
| Output Signal | 4 to 20 mA, 2-wire with HART communication |
| Auxiliary Power | 11 V to 35 V DC (standard) / 11 V to 30 V DC (Intrinsically Safe) |
| Galvanic Isolation | 1500 V AC |
| Load | Max. $(U_{aux} - 11 V) / 0.023 A$ |
| Accuracy | Approx. 0.1% of the set span |
| Ambient Temperature | -40°C to +85°C |
| Housing Material | Molded plastic (Potting: Epoxy) |
3. Product Advantages
Universal Compatibility: One device can handle almost all common sensor types, reducing your spare parts inventory.
HART Functional Diversity: Supports remote parameterization via SIMATIC PDM or handheld communicators.
High Reliability: Features sensor burnout and short-circuit monitoring, ensuring the system fails safely in case of hardware issues.
High Accuracy: Excellent long-term stability and minimal temperature drift.
Compact Design: Fits into even the smallest Type B connection heads.
4. Key Applications
This transmitter is widely used in industries requiring high precision and remote monitoring:
Chemical and Petrochemical: Monitoring reactor temperatures.
Power Plants: Steam and exhaust gas temperature measurement.
Food and Beverage: Temperature control in pasteurization or storage.
Water and Wastewater: Monitoring process temperatures in treatment plants.
5. Important Considerations (Precautions)
Explosion Protection: Ensure the specific sub-model matches the zone requirements (e.g., ATEX/IECEx if used in hazardous areas).
Wiring: Always follow the polarity markings for the 4-20 mA loop to avoid damage.
Configuration: While it can be used with default settings, specialized calibration via HART is recommended to match the specific sensor curve (Callendar-Van Dusen coefficients) for maximum accuracy.
Environment: If installed outdoors, ensure the Connection Head has an appropriate IP rating (e.g., IP65 or higher) to protect the transmitter from moisture.
Shipping Port: Xiamen, China
Payment: Bank of Chicago, Bank of Singapor
Express cooperation: fedex, DHL, UPS and your express account
Service: Professional Sales provides 24 hours /7 days online service
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