AMM21

Product Overview

Yokogawa AMM21 is a high-performance, microprocessor-based magnetic flow converter designed to work seamlessly with remote magnetic flow tubes.

Technical Specifications

Functional Performance

• Accuracy: Up to ±0.5% of flow rate depending on flow tube size and fluid conditions

• Display Unit: Multi-line LCD showing flow rate, span, totalized flow, and diagnostic alarms

• Data Memory Protection: EEPROM-based non-volatile storage with no backup battery required

• Input Signal (Status Input): Dry contact input for reset, zero adjustment, and range switching functions

• Current Output: 4 to 20 mA DC with up to 1000 Ω load resistance

Digital Communication

• Protocols: Brain or HART communication superimposed on 4–20 mA loop

• Minimum Load Resistance: Brain 250–600 Ω; HART 230–600 Ω

• Max Transmission Distance: Up to 2 km using suitable control cables

Physical & Environmental Specifications

• Enclosure Rating: IP67 / NEMA 4X dust and water protection

• Mounting Type: Pipe, wall, or panel mounting options

• Electrical Conduit Entries: 1/2 NPT, M20 × 1.5, Pg13.5, or G1/2

• Ambient Temperature Range: −10°C to 60°C

• Ambient Humidity: 5% to 95% RH non-condensing

Electrical Requirements

• Power Supply: 80–138 V AC, 138–264 V AC, or 20–130 V DC

• Power Consumption: Approximately 15–22 VA depending on configuration

• Grounding: Ground resistance ≤100 Ω, recommended ≤10 Ω for optimal surge protection

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