Product Overview
The Yokogawa F9342LA functions as the central processing unit for F9342 series differential pressure transmitters. This CPU board manages all measurement calculations and digital communications. Process control systems depend on this module for reliable pressure data acquisition. The assembly’s firmware supports BRAIN and HART protocols for flexible integration.
Technical Specifications
The Yokogawa F9342LA features a low-power microcontroller optimized for field instrument applications. Its design emphasizes measurement accuracy and long-term stability in harsh environments. The board integrates seamlessly with the transmitter’s sensor and output electronics. This processor handles both differential pressure and static pressure calculations simultaneously.
| Parameter | Specification |
|---|---|
| Product Type | CPU Assembly / Processor Board |
| Series Compatibility | Yokogawa F9342 Series (DPharp transmitters) |
| Processor | 16-bit microcontroller with hardware multiplier |
| Resolution (A/D) | 24-bit delta-sigma with 4-channel multiplexer |
| Sampling Frequency | 15 to 80 Hz (configurable) |
| Communication Protocols | BRAIN and HART |
| Output | 4-20 mA with superimposed digital signal |
| Memory (Flash) | 128 KB for firmware storage |
| Memory (EEPROM) | 16 KB for calibration and configuration |
| Data Retention | 20 years without power |
| Diagnostics | Continuous self-test with alarm output |
| Temperature Compensation | Factory-calibrated sensor drift correction |
| Power Supply | 12 to 45 V DC (loop-powered) |
| Current Consumption | 3.5 mA minimum; 22 mA maximum |
| Dimensions (L x W x H) | 50 mm x 38 mm x 14 mm |
| Weight | Approximately 0.11 kg |
| Connector Type | 8-pin and 12-pin headers |
| Operating Temperature | -40°C to +85°C |
| Storage Temperature | -50°C to +100°C |
Processing and Signal Conditioning
The Yokogawa F9342LA digitizes sensor signals with 24-bit resolution for high accuracy. Its internal algorithms apply polynomial corrections for linearity and thermal effects. The processor runs a damped averaging algorithm for stable readings in turbulent flows. This board calculates both differential pressure and static pressure values simultaneously.
Communication and Diagnostics
The Yokogawa F9342LA supports both BRAIN and HART digital communication protocols. Its diagnostic routines monitor sensor health and detect calibration drift over time. The module transmits status information along with the primary measurement value. This CPU assembly enables remote configuration and troubleshooting from control room workstations.
Power Management
The Yokogawa F9342LA operates entirely from the 4-20 mA current loop power. Its efficient design minimizes voltage drop for stable loop operation. The processor maintains functionality even with loop supply voltages as low as 12 V DC. This low-power characteristic makes the module suitable for long-distance field wiring.
Application Scenarios
This CPU board serves in oil and gas flow measurement using orifice plates and venturis. Chemical plants deploy it for reactor pressure monitoring and tank level applications. The Yokogawa F9342LA also supports clean water distribution and wastewater treatment systems.
Details
| Weight | 0.11 kg |
|---|---|
| Dimensions | 50 × 38 × 14 mm |
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