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YOKOGAWA MW100-E-1H
Product Introduction:
The MW100-E-1H is a high-precision weight transmitter from Yokogawa’s MW100 product line. The “E” designation indicates the enhanced functionality variant, and “1H” specifies the particular output and configuration code. This transmitter converts the low-level millivolt signal from load cells into a standardized 4–20 mA output with HART digital communication capability.
Detailed content
Technical Specifications:
- Input Signal: 0.5 to 3 mV/V (load cell mV output)
- Output Signal: 4 to 20 mA DC (2-wire), HART 7 protocol
- Excitation Voltage: 10 V DC (regulated, 50 mA max)
- Accuracy: ±0.02% of calibrated span
- Temperature Drift: ±0.002% of span per °C (0 to 50°C)
- Response Time: ≤10 ms (10% to 90% step change)
- Operating Temperature: -20°C to +70°C
- Protection Rating: IP65 / NEMA 4X (front panel)
- Power Supply: 12 to 36 V DC (loop-powered)
Functional Features:
- Supports HART 7 digital communication for remote configuration and diagnostics
- Zero and span calibration via HART communicator or local push buttons
- Built-in digital filtering with selectable time constants (0.2 s to 10 s)
- Overload protection rated at 150% of full scale
- Reverse polarity protection on power supply input
Performance Parameters:
| Parameter | Value |
|---|---|
| Load Cell Input Impedance | 350 Ω to 1000 Ω |
| Insulation Resistance | ≥100 MΩ at 500 V DC |
| Dielectric Strength | 1500 V AC for 1 minute (input to output to chassis) |
| Loop Resistance (max) | 600 Ω at 24 V DC supply |
Material Composition:
- Housing: Aluminum die-cast with epoxy powder coating (RAL 7032 pebble gray)
- Terminal Block: Phosphor bronze with tin plating
- Seals: Fluorocarbon rubber (Viton) gaskets
Structural Characteristics:
- Dimensions: 96 mm (W) × 144 mm (H) × 112 mm (D)
- Weight: Approximately 1.4 kg
- Mounting: Wall-mount or pipe-mount (35 mm DIN rail compatible via adapter)
- Display: 4-digit LCD with backlight (shows mA output, error codes)
Working Principle:
The MW100-E-1H receives the millivolt/volt signal from a load cell, amplifies it using a precision instrumentation amplifier with auto-zero calibration, converts it to a 4–20 mA current loop output via a 16-bit D/A converter, and superimposes HART FSK (Frequency Shift Keying) digital signals on the same loop for bidirectional communication.
Key Advantages:
- ±0.02% accuracy — among the highest in the weight transmitter class
- HART 7 compatibility enables remote diagnostics without physical access
- IP65 front panel allows deployment in washdown and outdoor environments
- Compact form factor reduces panel space requirements
Applicable Industries:
- Pharmaceutical batch weighing
- Food and beverage production line weighing
- Chemical process batch control
- Bulk material hopper and silo weighing
- Packaging and filling machines
Installation Requirements:
- Mount at ambient temperature within -20°C to +70°C
- Route load cell cables in shielded twisted-pair, minimum 0.5 mm² cross-section
- Connect shield ground at transmitter end only (single-point grounding)
- Ensure loop power supply ≥12 V DC with adequate current headroom (≥25 mA)
Usage Precautions:
- Do not exceed 36 V DC supply voltage — will destroy the internal regulator
- Perform zero calibration with no load on the scale before each weighing session
- Do not open the housing in explosive atmospheres — the unit is not intrinsically safe (purchase IS version if required)
- Verify load cell mV/V rating matches transmitter input range (0.5–3 mV/V)
