Technical Overview
The Yokogawa F9900RR functions as the central processor assembly for the DPharp EJA series pressure transmitters. This module converts raw pressure signals into a 4-20 mA DC output for reliable process control applications. It also supports HART protocol communication, enabling remote configuration and digital diagnostics from a central location. The F9900RR integrates seamlessly with the sensor module to deliver accurate and stable pressure measurements over extended operating periods.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Yokogawa Electric Corporation |
| Product Type | CPU Assembly / Electronic Module |
| Compatibility | DPharp EJA series pressure transmitters |
| Output Signal | 4-20 mA DC |
| Communication | HART protocol (digital communication) |
| Power Supply | 10.5–42 VDC |
| Current Draw | 4–20 mA (signal current) |
| Load Resistance | 250 Ω (HART communication) |
| Diagnostic Functions | Self-diagnostics, sensor error detection |
| Mounting Type | Integral to transmitter housing |
| Enclosure Material | Aluminum alloy / Stainless steel |
| Protection Class | IP67 |
| Operating Temperature | -40°C to +85°C |
| Storage Temperature | -50°C to +90°C |
| Humidity Tolerance | 0% to 100% RH |
| Weight | 0.5 kg (approx.) |
| Certifications | CE, CSA, TÜV (IEC 61508) |
Signal Processing and Communication
The Yokogawa F9900RR uses advanced digital signal processing to convert the sensor’s frequency output into a standard analog signal. This conversion maintains high accuracy across the full measurement range, from -40°C to +85°C operating temperature. The integrated HART protocol supports simultaneous digital and analog communication, enabling remote access to diagnostic data and transmitter configuration parameters.
Integration and Diagnostic Capabilities
This module integrates directly with the EJA series sensor assembly, forming a complete pressure measurement solution. The F9900RR performs continuous self-diagnostics, monitoring internal functions and sensor integrity for reliable operation. Consequently, it supports predictive maintenance strategies by providing early warnings of potential failures or calibration drift.
Environmental Protection and Durability
The F9900RR features a rugged, hermetically sealed housing that protects sensitive electronics from moisture and corrosion. Its IP67 rating ensures reliable operation in outdoor, washdown, or high-humidity environments. With a wide power supply range and robust construction, this CPU assembly delivers consistent performance in harsh industrial settings such as refineries or chemical plants.
Details
| Weight | 0.5 kg |
|---|---|
| Dimensions | 32 × 178 × 142 mm |
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