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YOKOGAWA MW100-E-1D-SS3/M1/M3
Product Introduction:
The MW100-E-1D-SS3/M1/M3 is a digital weight transmitter from Yokogawa’s MW100 series, designed for weighing applications in hazardous (explosive) areas. The E suffix denotes explosion-proof (Ex d) certification. The 1D option indicates 1-channel (single weight) digital indication/transmission. SS3 specifies 316L stainless steel housing for maximum corrosion resistance. M1/M3 are specific output/communication options.
Detailed content
Technical Specifications:
| Parameter | Value |
|---|---|
| Product Type | Digital Weight Transmitter / Indicator |
| Number of Channels | 1 (1D = single channel) |
| Input | Up to 4 × 350 Ω load cells (parallel) or 1 × 350 Ω load cell |
| Excitation Voltage | 10 V DC (regulated, 50 mA max.) |
| Display | 6-digit, 20 mm high red LED (5-digit + 1-digit sign/decimal) |
| Output Signal | 4–20 mA DC (isolated) / RS-485 (Modbus RTU) — per M1/M3 option |
| Accuracy | ±0.02% of full scale (typ.) |
| A/D Resolution | 24-bit sigma-delta |
| Sampling Rate | 80 Hz |
| Zero Tracking | Auto zero tracking with user-adjustable filter |
| Explosion Protection | Ex d IIC T6 Gb (ATEX), Ex d IIC T6 (IECEx), Class I Div.1 Group ABCD (FM/CSA) |
| Housing Material | 316L Stainless Steel (SS3) |
| Protection Rating | IP66/IP67 (stainless steel housing) |
| Operating Temperature | -20°C to +60°C (Ex rated) |
| Power Supply | 24 V DC (9–36 V DC range) |
| Power Consumption | Max. 8 W |
| Panel Cutout | 96 mm × 48 mm (1/16 DIN, rectangular) |
| Weight | Approx. 1.2 kg |
| Option M1 | 4–20 mA output + RS-485 (Modbus RTU) |
| Option M3 | Dual 4–20 mA outputs (primary + secondary) + RS-485 |
Functional Features:
- 24-bit A/D conversion — ultra-high resolution for precise weighing
- Auto zero tracking — compensates for drift due to temperature changes
- Digital filtering — configurable cutoff frequency for stable readings in vibrating environments
- Tare function — with preset tare memory (up to 10 tare values)
- Gross/Net/Tare display selectable
- Modbus RTU communication — integrates with SCADA, PLC, DCS
- Explosion-proof certification — safe for use in Zone 1 and Zone 2 hazardous areas
Material Composition:
- Housing: 316L Stainless Steel (SS3) — resistant to chlorides, acids, and caustic solutions
- Window: Sapphire glass or hardened borosilicate glass
- Gaskets: FKM (Viton) O-rings
- Terminals: 316L stainless steel with ceramic insulation
- Internal PCB: Conformal coated, potted for moisture resistance
Structural Features:
- 1/16 DIN rectangular panel cutout: 96 × 48 mm
- Depth behind panel: approx. 100 mm
- Cable gland entries: 2× M20 × 1.5 (Ex d certified)
- Front-panel push buttons with stainless steel bezels
- LED display recessed behind sapphire window
Working Principle:
Load cells (strain gauge type) produce a millivolt signal proportional to applied force (typically 2 mV/V at full scale). The transmitter provides a regulated 10 V DC excitation to the load cells. The millivolt signal is amplified by a 24-bit sigma-delta A/D converter with programmable gain. The microprocessor applies linearization, temperature compensation, zero tracking, and filtering to produce a stable weight reading. The result is displayed on the LED and transmitted as 4–20 mA or Modbus RTU to external systems.
Advantages & Highlights:
- 316L stainless steel — ideal for food, pharmaceutical, and chemical weighing in corrosive environments
- Ex d IIC T6 — highest explosion protection level, suitable for gas and dust hazardous areas
- 24-bit resolution — readable to 0.001% of full scale
- RS-485 Modbus — easy integration with existing plant networks
- Auto zero tracking eliminates need for manual zeroing in temperature-varying environments
Applicable Industries:
- Chemical & Petrochemical (hazardous area weighing)
- Pharmaceutical (powder/granule weighing in clean/corrosive environments)
- Food & Beverage (washdown-capable stainless steel)
- Mining & Minerals (explosive atmosphere weighing)
- Paint & Coating (solvent-resistant)
- Waste Management (truck/hopper scales)
Installation Requirements:
- Mount in 1/16 DIN cutout (96 × 48 mm) with gasket seal
- Use shielded cable for load cell connections — max. 30 m recommended
- Excite load cells with transmitter power only — do not use external excitation
- Ground the housing to equipment earth with ≤ 1 Ω resistance
- Ensure cable gland torque: 10 N·m for Ex d integrity
Usage Precautions:
- Do not open housing in hazardous area — all servicing must be done in safe area or by certified personnel
- Verify Ex certification matches your zone classification before installation
- Do not exceed 4 load cells (350 Ω each) in parallel — will overload excitation circuit
- Calibrate with certified test weights at installation and annually thereafter
- Do not apply shock loads exceeding 150% of full scale — will damage load cells
