IFM DD2503 Speed Monitor 0.1-1000Hz 2 Relay 4-20mA DIN Rail

Overview
The IFM DD2503 (MONITOR/FR-1 /110-240VAC/DC) is a microprocessor-controlled evaluation unit for speed monitoring, designed to detect frequency, speed, and rotational speed in industrial automation applications. This versatile device enables reliable monitoring of overspeed or underspeed conditions, featuring two separately adjustable limit values with dedicated outputs for each limit value. Equipped with a clearly readable, luminous OLED display (128 x 64 pixels), the DD2503 provides intuitive programming and real‑time actual value indication, simplifying commissioning and troubleshooting. The unit features two relay outputs (6A at 250V AC, B300/R300 rating) and two transistor outputs for flexible signal processing, plus a programmable analog output (4‑20 mA) for integration into control and monitoring systems. Housed in a compact rectangular enclosure for DIN rail mounting (78 x 45 x 124.7 mm), the DD2503 accepts universal AC (110…240 V, 50/60 Hz) or DC (27 V) power, with an auxiliary 19.6…27.7 V DC output for powering external sensors (SELV, ≤15 mA). Rated IP50 (housing) with IP20 terminals, the unit operates from -40°C to 60°C, offers an integrated frequency-to-current converter, and includes a test function without external frequency for easy verification. With an MTBF of 152 years and compliance with EN 61000-6-2/EMC standards, the DD2503 delivers robust, long‑term reliability for industrial motion monitoring and process control.

Key Features

• Original brand new, within warranty period – Factory‑sealed, genuine IFM component with full manufacturer warranty.

• 100% Satisfaction Guarantee – Risk‑free purchase; if you are not completely satisfied, we will replace or refund.

• Microprocessor‑controlled pulse evaluation – The integrated microprocessor processes incoming pulse signals quickly and precisely for accurate evaluation of frequency, rotational speed, linear speed, pulses, and machine cycles.

• Dual relay and dual transistor outputs – Two relay outputs (6A at 250V AC) and two transistor outputs provide flexible signal processing for overspeed/underspeed alarms and control functions.

• Programmable analog output (4‑20 mA) – Integrated frequency-to-current converter delivers a scalable 4‑20 mA analog output (max. load 500 Ω) proportional to measured speed, enabling seamless integration into PLCs, SCADA, and process control systems.

• Luminous OLED display with intuitive programming – Clearly readable, luminous 128 x 64 pixel OLED display shows real‑time actual values and simplifies programming, eliminating the need for external tools.

• Universal AC/DC power supply – Wide input range: 110…240 V AC (50/60 Hz) or 27 V DC, with a voltage tolerance of <10%, ensuring global compatibility and flexible installation.

• Integrated sensor power supply – Provides 19.6…27.7 V DC auxiliary output (SELV, ≤15 mA) to directly power external sensors, reducing additional power supply components.

• Wide measurement range – Programmable from 0.1 to 1000 Hz (frequency) or 1 to 60,000 Imp/min (rotational speed), accommodating a broad range of industrial monitoring applications.

• Robust DIN rail housing with high protection – Compact housing for DIN rail mounting (78 x 45 x 124.7 mm), IP50 housing with IP20 terminals, operating temperature -40…60°C, and storage temperature -40…85°C.

• Test function and key function for easy verification – Built‑in test function without external frequency and key function allow quick system checks and commissioning without external signal generators.

Technical Specifications

Applications

• Overspeed/underspeed monitoring of rotating machinery such as motors, conveyors, fans, pumps, and turbines.

• Conveyor belt speed monitoring in material handling, packaging, and logistics systems.

• Rotational speed detection for shafts, spindles, and rotating equipment in manufacturing and process industries.

• Frequency monitoring of pulse generators and incremental encoders in automation systems.

• Machine cycle counting for predictive maintenance and performance optimization.

• Industrial automation systems requiring flexible relay/transistor switching outputs and 4‑20 mA analog feedback for SCADA or PLC integration.

• Retrofit and upgrade applications where existing mechanical speed switches require replacement with programmable electronic monitoring.

Package Includes

• 1 × IFM DD2503 evaluation unit for speed monitoring (MONITOR/FR-1 /110-240VAC/DC)

• Dual‑chamber terminal connectors (pre‑installed)

• Standard documentation / instruction manual