SES 2422 Frequency to Analog Converter

The SES 2422 is a versatile frequency‑to‑analog converter designed to interface pulse‑output sensors with standard analog input cards. It accepts frequency, pulse, or NAMUR signals and produces a galvanically isolated 4–20 mA or 0–10 V DC output proportional to the input frequency.

Technical Specifications

The SES 2422 offers high accuracy and linearity, with a response time configurable to suit the application (fast for speed control, slower for averaging in flow measurement). The output is isolated to 2.5 kV AC, ensuring safe connection to the control system. A built‑in sensor supply (8 V DC, 15 mA) can power external NAMUR or proximity sensors directly.

• Input Signals: NPN/PNP pulses, NAMUR (EN 60947‑5‑6), voltage pulses (3–30 V), mechanical contacts

• Frequency Range: 0–10 Hz to 0–10 kHz (programmable)

• Output Types: 4–20 mA, 0–10 V DC (active/passive)

• Accuracy: ±0.2% of full scale

• Isolation: 2.5 kV AC (input/output/power)

• Response Time: 20 ms to 5 s (adjustable)

• Sensor Supply: 8 V DC, 15 mA (for NAMUR sensors)

• Power Supply: 24 V DC ±10%, 3 W max

Application Fields

Typical applications include speed monitoring of rotating machinery (via inductive proximity sensors), flow measurement from turbine or paddlewheel flowmeters, and rotational speed feedback for motor controllers. The unit is also used to convert encoder pulses to a 4‑20 mA signal for display or control purposes.

Configuration and Status

Configuration is performed via DIP switches, allowing selection of input type, frequency range, output mode, and filter time. Status LEDs indicate power, input activity, and output fault conditions. The SES 2422 is housed in a 12.5 mm DIN rail enclosure and meets CE, UL, and RoHS standards.