The Adtech 401800 is a precision signal conditioning and measurement instrument that converts multiple analog input signal types into a standard 4-20 mA DC output. Engineered for industrial process control, monitoring, and automation, the unit accepts AC/DC voltage and current, frequency, millivolts, potentiometer, RTD, thermocouple, and dry contact closure inputs across wide measurement ranges. Independent zero and span controls with elevation/suppression capability up to 100% of range enable flexible signal mapping and offset adjustment.
Technical Specifications
Input signal types include AC voltage (10 mV–100 Vrms DC to 5 kHz; 50 mV–50 Vrms 5–30 kHz), DC voltage (10 mV–100 V), AC/DC current, frequency (0–30 Hz to 0–30 kHz full scale), millivolts, potentiometer inputs, RTD and thermocouple sensors, and dry contact closures rated 2 mA @ 24 VAC. Calibrated accuracy is ±0.1% of span with linearity to ±0.02% maximum (±0.01% typical). Repeatability reaches ±0.005% maximum and ±0.002% typical. Temperature coefficient on zero and span is ±0.01% of span per °C maximum. Power supply effects and load effects are each ±0.005% of span maximum. Output ripple is limited to 10 mV peak-to-peak. Step response time is 350 milliseconds (10%–90%), with -3 dB bandwidth of 1 Hz.
– Key Features
• Zero control: ±10% of span adjustable
• Span control: 50%–100% of selected range
• Power supply range: 8–42 VDC
• Output loop drive capability: up to 1700 ohms @ 42 VDC
• Input/Output/Case isolation: 1000 VDC or 600 VAC
• RFI resistance and reverse polarity protection
• Operating temperature: -25° to 185°F (-31° to 85°C)
• Storage temperature: -40° to 200°F (-40° to 93°C)
– Typical Applications
Process control systems, temperature and pressure monitoring, frequency measurement and conversion, sensor signal conditioning, and multi-signal industrial data acquisition.
– Compatibility & Integration
The 4-20 mA current loop output integrates directly with PLCs, DCS systems, panel meters, and standard industrial instrumentation. The broad input flexibility allows connection to diverse sensor types and signal sources without external transducers.
