Technical Specifications:

• Measurement Type: Differential Pressure (DP), Gauge Pressure, Absolute Pressure (selectable)
• Measurement Range: 0 to 100 kPa (varies by configuration)
• Accuracy: ±0.04% of URL (Upper Range Limit)
• Static Pressure Effect: ±0.04% of URL per 10 MPa
• Overpressure Protection: 1.5 times URL (up to 40 MPa static pressure)
• Output Signals: 4–20 mA DC (HART 7), FOUNDATION Fieldbus, Profibus PA, Modbus
• Power Supply: DC 12 V to 45 V (2-wire loop-powered)
• Protection Rating: IP67 (transmitter); IP68 (cable gland)
• Ambient Temperature: -40°C to +85°C
• Process Temperature (Diaphragm Seal): -40°C to +200°C (depends on fill fluid and seal material)
• Response Time: ≤ 100 ms (with capillary length ≤ 3 m); increases with capillary length

Material Composition:

• Diaphragm Seal Material: SUS316L stainless steel, Hastelloy C-276, Tantalum, Monel, Titanium (selectable by A1DH/BR/FF1/FN1 code)
• Fill Fluid: Silicone oil (standard), fluorinated oil (high-temp), or inert oil (sanitary)
• Transmitter Housing: Aluminum alloy with epoxy coating
• Capillary Tube: SUS316L stainless steel (3.2 mm OD)
• Process Connection: 1/2-14 NPT (standard for diaphragm seals)

Model Code Breakdown:

• AE: EJX series transmitter
• 102: Differential pressure / gauge pressure transmitter
• M: Remote diaphragm seal (wet leg) configuration
• N: Specific output/communication configuration
• AB1: Housing material / certification code
• LNA: Process connection / capillary specification
• A1DH: Diaphragm material option (Hastelloy C-276)
• BR: Fill fluid option (standard silicone)
• FF1: Flange rating / temperature rating
• FN1: Special options (calibration, display, etc.)

Working Principle:
The process pressure acts on the diaphragm of the remote seal, which is transmitted through a capillary tube filled with incompressible fill fluid to the silicon resonant sensor inside the transmitter. The sensor uses dual resonant element technology — two H-shaped silicon resonators vibrate at their natural frequency. Differential pressure causes a frequency shift proportional to the pressure difference, which is converted to a 4–20 mA output. The remote seal configuration allows the transmitter to be mounted away from the process, protecting it from extreme temperatures, corrosive media, and clogging.

Advantages & Highlights:

• ±0.04% accuracy — highest in class for DP transmitters
• Remote diaphragm seals enable measurement of highly corrosive, viscous, or sanitary fluids
• Dual resonant sensor provides excellent long-term stability (±0.04% per 10 years)
• Multi-sensing capability: DP, GP, AP, level, flow, density
• Self-diagnostics with HART 7 and FOUNDATION Fieldbus

Applicable Industries:

• Chemical and petrochemical plants (corrosive acids, alkalis)
• Pharmaceutical and biotech (sanitary applications, SIP/CIP compatible)
• Oil and gas (crude oil, slurry, heavy oil)
• Power generation (boiler drum level, condenser level)
• Pulp and paper (black liquor, white liquor)

Installation Requirements:

• Mount the transmitter at the same elevation as the upper tap for level measurement, or below for flow measurement
• Keep capillary tube length as short as practical (≤ 15 m maximum recommended) to minimize response time degradation
• Avoid sharp bends in capillary tubing (minimum bend radius: 75 mm)
• Ensure all connections are leak-tight — any leak in the capillary system will cause measurement error

Usage Precautions:

• Do not exceed the maximum static pressure rating of the diaphragm seal at the operating temperature
• For high-temperature service (> 150°C), verify fill fluid compatibility and maximum temperature rating
• Perform zero calibration with both process taps at equal pressure (for DP) or at atmospheric pressure (for GP/AP)
• In cold climates, ensure the fill fluid does not freeze (use appropriate fill fluid for sub-zero temperatures)