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Yokogawa SPW481-SEPA
Product Type: Wireless Pressure / Differential Pressure Transmitter (Battery-Powered)
Product Introduction:
The SPW481-SEPA is a battery-powered, wireless pressure transmitter from Yokogawa’s SPW smart wireless product line. It is designed for pressure and differential pressure measurement in remote or hard-to-wire locations. The “SEPA” suffix denotes a specific configuration variant for a particular pressure range and output protocol.
Detailed content
Model Code Breakdown:
- SPW481 — Smart Wireless Pressure Transmitter, EJA-based sensing
- SEPA — Configuration code: Specific pressure range, 4–20 mA / HART output, absolute pressure type (SE), with process connection option (PA)
Technical Specifications:
| Parameter | Value |
|---|---|
| Measurement Type | Pressure / Differential Pressure / Absolute Pressure / Gauge Pressure |
| Sensing Element | Silicon resonant sensor (EJA-derived) |
| Pressure Range | 0 to 100 kPa (configurable, depends on SEPA variant) |
| Accuracy | ±0.075% of URL (typically) |
| Output Signal | 4–20 mA DC (HART 7 protocol superimposed) |
| Wireless Protocol | WirelessHART (IEC 62591), ISA100.11a |
| Battery Life | ≥ 5 years (at 1 measurement/minute, 25°C) |
| Battery Type | 3.6V DC Lithium battery (ER6V/14500, 2.4 Ah) |
| Operating Temperature | -40°C to +85°C |
| Process Temperature | -40°C to +120°C (depending on wetted materials) |
| Enclosure Rating | IP67 / IP68 (NEMA 6P) |
| Process Connection | 1/2 NPT (standard), other options available |
| Wetted Materials | 316L Stainless Steel (standard), Hastelloy C-276, Monel, Tantalum (options) |
| Communication Range | Up to 100 m line-of-sight (wireless), unlimited via gateway |
| Certifications | ATEX, IECEx, FM, CSA, SIL2 (optional) |
Functional Features:
- Wireless communication eliminates need for signal cabling
- Self-diagnostics with alerts for sensor degradation, battery low, and blockage
- Multi-variable output: Primary variable (pressure) + secondary variables (temperature, static pressure for DP)
- Damping adjustment via HART communicator or wireless configuration
- Zero and span calibration via HART or wireless command
- Data logging capability with timestamped measurements
Structural Features:
- Compact cylindrical housing (approximately 60 mm diameter x 180 mm length)
- Integral process connection (no impulse lines required for gauge/absolute)
- LCD display optional (via HART handheld)
- Wall/pipe mounting bracket included
Applicable Industries:
- Oil and gas (wellhead, pipeline monitoring)
- Chemical processing
- Power plant (boiler, condenser monitoring)
- Water and wastewater
- Remote tank level measurement (via DP)
Installation Requirements:
- Mount the transmitter at or below the process connection point for liquid service
- Ensure line-of-sight to wireless gateway within 100 m
- Use approved cable glands for process connection (Ex-rated for hazardous areas)
- Verify battery installation polarity before commissioning
Usage Precautions:
- Do not expose the transmitter to temperatures exceeding +120°C at the process connection
- Replace battery only with Yokogawa-specified ER6V/14500 lithium battery
- Perform zero calibration after any mechanical shock or impact
- In hazardous areas, ensure the Ex-rating of the transmitter matches the zone classification
