Model Number Breakdown:

• PK200: EJA series pressure transmitter (general-purpose, high-performance)
• A73: Pressure range 0–100 kPa (gauge); output 4–20 mA HART
• FF1: Flush diaphragm (齐平膜片) with 316L SS wetted material; DN25 (1″) flange
• AM: Aluminum mounting bracket (process connection adapter)
• SS: Stainless steel (SS316L) for all wetted parts

Key Specifications:

• Measured Variable: Gauge Pressure (0–100 kPa)
• Output Signal: 4–20 mA DC (HART 7 superimposed); FOUNDATION Fieldbus (FF) optional
• Accuracy: ±0.04% of URL (URL = Upper Range Limit = 100 kPa)
• Operating Pressure Range: 0 to 100 kPa (gauge)
• Ambient Temperature: -40 to +85 °C (operating); -40 to +120 °C (storage)
• Process Temperature: -40 to +120 °C (with flush diaphragm)
• Static Pressure Effect: ±0.04% of URL per 10 MPa
• Temperature Effect: ±0.04% of URL per 50 °C
• Overpressure Protection: 1.5 × URL (150 kPa) without damage
• Burst Pressure: 4.0 × URL (400 kPa)
• Response Time (T90): ≤ 100 ms (with flush diaphragm)
• Power Supply: 12–45 V DC (typical 24 V DC)
• Power Consumption: ≤ 22 mA (at 24 V DC, with HART)
• Communication: HART 7; FOUNDATION Fieldbus H1 (31.25 kbps) optional
• Protection Rating: IP67 (with proper cable gland)

Functional Features:

• Smart Diagnostics: Self-diagnosis, sensor health monitoring, impulse line blockage detection, overpressure alert
• Range Adjustment: Remote zero and span adjustment via HART handheld or DCS
• Damping: Adjustable 0.1 to 32 seconds
• Square Root Extraction: Built-in √ function for flow measurement (with orifice plate)
• Totalizer: Pulse totalizer for batch or cumulative flow applications
• Multivariable Option: Can simultaneously output pressure and temperature (with built-in RTD)

Material Composition:

• Sensor: Silicon resonant sensor with Hastelloy C-276 diaphragm
• Wetted Parts: SS316L stainless steel (FF1 flush diaphragm specification)
• Housing: Aluminum alloy (AM mounting bracket) with epoxy powder coating
• Cable Gland: SS316 stainless steel (PG13.5, IP68)
• Process Connection: DN25 (1″) flange per JIS 10K / ANSI 150; FF1 flush diaphragm — no dead volume

Structural Characteristics:

• Form Factor: In-line / direct mounting with flush diaphragm
• Dimensions (Transmitter Body): 72 mm (Ø) × 170 mm (L) (approximate, excluding flange)
• Weight: Approximately 2.8 kg (with flange and bracket)
• Process Connection: DN25 (1″) JIS 10K flange; flush diaphragm (FF1) — no impulse line required

Operating Principle:
The silicon resonant sensor consists of a vibrating silicon diaphragm whose resonant frequency changes proportionally with applied pressure. The sensor is fabricated using MEMS (Micro-Electro-Mechanical Systems) technology on a single silicon chip. The pressure applied to the Hastelloy C-276 diaphragm is transmitted through silicon oil fill fluid to the silicon resonant element. The change in resonant frequency is converted to a digital signal, linearized, temperature-compensated, and output as a 4–20 mA DC signal. The HART 7 protocol superimposes digital communication on the 4–20 mA loop for remote configuration and diagnostics. The flush diaphragm (FF1) design eliminates impulse lines, preventing clogging, freezing, or leakage in viscous, corrosive, or hygienic applications.

Advantages & Highlights:

• Exceptional Accuracy: ±0.04% of URL — industry-leading for smart transmitters
• Flush Diaphragm (FF1): Zero dead volume — ideal for sanitary, viscous, or crystallizing process fluids
• Silicon Resonant Sensor: No drift over time — long-term stability of ±0.04% per year
• Multivariable Capability: Simultaneous pressure and temperature output from a single transmitter

Applicable Industries:

• Chemical & Petrochemical
• Oil & Gas (Production/Refining)
• Pharmaceutical & Biotech (Sanitary Applications)
• Food & Beverage
• Power Generation
• Pulp & Paper
• Semiconductor Manufacturing

Installation Requirements:

• Mount the transmitter vertically with the pressure port facing upward for gas service or downward for liquid service
• Use shielded twisted-pair cable; maximum cable length: 1500 m (depending on wire gauge)
• Tighten flange bolts to 25 N·m torque using a torque wrench — do not over-tighten
• Provide 24 V DC loop power with minimum 25 mA capacity
• Ensure the flush diaphragm is fully exposed to the process fluid — no bypass piping

Usage Precautions:

• Do not apply pressure exceeding 150 kPa (1.5 × URL) — permanent sensor damage may occur
• Do not expose the transmitter to temperatures above +120 °C — silicon oil may degrade
• For corrosive process fluids, verify SS316L compatibility — for stronger acids, consider Hastelloy C-276 wetted parts option
• Perform zero calibration after installation — the mounting position may cause a static head offset
• Do not disassemble the flush diaphragm assembly in the field — it is hermetically sealed