Introduction to COOPER AAP3798102-00037
Product Description
The COOPER AAP3798102-00037 is a high-performance industrial pressure transmitter designed for precise pressure measurement in harsh and hazardous environments. Manufactured by Cooper Instrument Corporation, a leading provider of process instrumentation, this transmitter is engineered to deliver reliable performance in applications such as oil and gas production, chemical processing, power generation, and wastewater treatment.
Featuring a robust stainless-steel construction and advanced sensor technology, the AAP3798102-00037 excels in measuring gauge, absolute, or differential pressure of liquids, gases, and vapors. Its design incorporates intrinsic safety and explosion-proof certifications, making it suitable for use in Zone 0/1 hazardous areas where flammable substances may be present. The transmitter converts pressure signals into a standardized 4-20 mA analog output, enabling seamless integration with control systems, PLCs, and data acquisition devices for real-time monitoring and process control.
Technical Parameters
- Measurement Range: 0-1000 psi (gauge pressure); optional ranges available (0-500 psi to 0-5000 psi)
- Accuracy: ±0.1% of full scale (including linearity, hysteresis, and repeatability)
- Output Signal: 4-20 mA DC with HART communication protocol (two-wire)
- Power Supply: 12-45 V DC (loop-powered)
- Operating Temperature: -40°C to +85°C (-40°F to +185°F)
- Process Temperature: -50°C to +125°C (-58°F to +257°F)
- Pressure Limit: 150% of full scale (overpressure); 300% of full scale (burst pressure)
- Process Connection: 1/2 NPT male (stainless steel 316L)
- Electrical Connection: 1/2 NPT conduit entry with terminal block
- Enclosure Material: 316L stainless steel
- Protection Rating: IP67 (weatherproof and dust-tight)
- Certifications: ATEX/IECEx (Zone 0/1), UL/cUL Class I Div 1, FM approved
- Vibration Resistance: 10-2000 Hz, 10 g peak (IEC 60068-2-6)
- Shock Resistance: 50 g peak (11 ms duration, IEC 60068-2-27)
- Response Time: ≤100 ms (90% of step change)
Usage Methods
- Installation:
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- Mount the transmitter using the 1/2 NPT process connection, ensuring the sensing element is oriented vertically to avoid air entrapment in liquid applications.
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- Install in a location with minimal vibration and away from direct heat sources or corrosive fumes.
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- For hazardous areas, ensure proper grounding (resistance ≤4Ω) and use certified conduit fittings to maintain explosion-proof integrity.
- Wiring:
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- Connect the transmitter to the control system using twisted-pair shielded cable (22 AWG minimum).
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- Wire the 4-20 mA signal: positive lead to the system’s analog input, negative lead to the system’s 24 V DC power supply (loop completion).
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- Ground the cable shield at the control system end to minimize electromagnetic interference.
- Calibration:
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- Perform zero and span calibration using a HART communicator (e.g., Rosemount 475) or compatible software.
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- Apply a known pressure source to the transmitter and adjust the zero (4 mA) and span (20 mA) settings to match the reference values.
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- Verify calibration across the measurement range to ensure accuracy.
- Operation and Maintenance:
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- Monitor the 4-20 mA output using a multimeter or control system to confirm proper operation.
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- Use HART communication to read process variables, configure parameters (e.g., units, damping), and perform diagnostics.
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- Inspect the process connection quarterly for leaks or corrosion; tighten fittings if necessary.
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- Clean the sensor surface annually using a soft cloth and mild detergent (avoid abrasive materials).
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- Recalibrate the transmitter every 12-24 months, depending on application requirements.
System Introduction
The COOPER AAP3798102-00037 operates as a critical sensing component in industrial process control systems, integrating with three key layers:
- Sensing Layer: The pressure sensor (a piezoresistive element) converts applied pressure into a small electrical signal, which is amplified and conditioned by internal electronics.
- Signal Conversion Layer: The conditioned signal is converted into a 4-20 mA analog output, where 4 mA corresponds to 0% of the measurement range and 20 mA corresponds to 100%. HART protocol enables bidirectional digital communication for configuration and diagnostics.
- Control Integration Layer: The 4-20 mA signal is transmitted to a PLC, DCS, or SCADA system, which uses the data to adjust valves, pumps, or other actuators and maintain process pressure within desired limits.
In a typical oil refinery application, the transmitter monitors the pressure of crude oil in a pipeline. If pressure exceeds the setpoint, the control system receives the elevated 4-20 mA signal and triggers a valve to open, relieving pressure and preventing overpressure incidents. HART communication allows operators to remotely troubleshoot the transmitter without interrupting the process.
Related Models in the Series
- AAP3798102-00038: 0-5000 psi range variant, designed for high-pressure applications such as hydraulic systems and wellhead monitoring.
- AAP3798102-00040: Differential pressure model (0-100 psi), ideal for filter monitoring, flow measurement, and level control in closed tanks.
- AAP3798102-00039: Absolute pressure version (0-1000 psi), suitable for applications requiring reference to a perfect vacuum, such as vacuum systems.
- AAP3798102-00042: Intrinsically safe only model (no explosion-proof housing), optimized for cost-sensitive Zone 0 applications.
- AAP3798102-00045: Wireless HART variant, eliminating wiring costs in remote locations (e.g., offshore platforms, pipeline segments).
- AAP3798102-00041: High-temperature model (-50°C to +150°C process temperature), designed for steam systems and furnace pressure monitoring.
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