Rosemount 1056‑02‑21‑31‑AN‑UL Liquid Analytical Transmitter Unit

Module Feature

1056‑02‑21‑31‑AN‑UL belongs to Rosemount 1056 series intelligent four‑wire multi‑parameter liquid analytical transmitter. It adopts modular hardware design and supports single or dual sensor inputs, compatible with pH, ORP, conductivity, dissolved oxygen and other liquid‑analysis sensors. It features large customizable LCD display, automatic sensor board recognition, built‑in analog 4‑20 mA output, and UL certification. Compact 1/2‑DIN panel‑mount structure saves cabinet space. Widely used for water treatment, municipal water supply, chemical, food‑beverage and industrial circulating‑water quality monitoring.

Working principle

The transmitter receives weak analog signals from field‑mounted analytical sensors. Internal circuit converts raw sensor signals into calibrated engineering values such as pH, conductivity or dissolved‑oxygen concentration. Process measurement values are shown on local display and converted to 4‑20 mA analog output for connecting to PLC or DCS control system. Built‑in temperature compensation circuit corrects measurement deviation caused by liquid temperature variation.

Onboard components

Main CPU circuit board, dual‑channel sensor input module, LCD display panel, membrane keypad, analog output circuit, power‑supply unit, terminal block for sensor and signal wiring, polycarbonate enclosure, sealing gasket.

LED indicators

Status LED indicators for power and fault alarm. Real‑time measured values, alarm information and diagnostic codes are displayed on LCD screen.

Hardware self‑diagnosis

Read on‑board diagnostic codes, monitor sensor signal stability, check analog output loop current, inspect power‑supply voltage, verify wiring terminal tightness, detect sensor open‑circuit or short‑circuit failure.

Programming software

Local parameter configuration via front‑panel keypad. Supports remote parameter access through external host system with analog loop; no dedicated PC configuration software required for basic setup.

Electrical & Process Parameters

Model:1056‑02‑21‑31‑AN‑UL Brand:Rosemount Device type:Multi‑Parameter Liquid Analytical Transmitter Input:Dual‑channel sensor input Output:4‑20 mA analog signal output Mounting:1/2 DIN panel mount Function:Liquid‑quality parameter measurement, process signal transmission

Mechanical & Structure

Mounting:Panel cut‑out installation (1/2 DIN) Protection class:IP65 / NEMA Type 4X Housing:Flame‑retardant polycarbonate housing

Environmental

Operating temperature:0℃ ~ +50℃ Storage temperature:-20℃ ~ +60℃ Ambient humidity:5~95% non‑condensing Certification:UL compliant, industrial process analytical instrument standard Status: Rosemount original 1056 series liquid analyzer transmitter

Installation

Cut cabinet panel according to 1/2‑DIN dimension. Insert transmitter into panel opening and fasten mounting clamps. Connect sensor cables, analog output loop and AC power supply to corresponding terminals. Complete sensor calibration procedure after power‑on, verify measurement reading and 4‑20 mA output accuracy.

Interface

Sensor input screw terminals, 4‑20 mA analog output terminals, AC power terminals, front membrane keypad and LCD display window.

Diagnostic

Inaccurate measurement: uncalibrated sensor, sensor aging or incorrect temperature‑compensation setting. No analog output: loop wiring fault or wrong output configuration. Display alarm code: sensor open‑circuit / short‑circuit or internal hardware failure. No power: power‑supply wiring error.

Product Brief

Rosemount 1056‑02‑21‑31‑AN‑UL multi‑parameter liquid analytical transmitter, provides stable on‑line water‑quality measurement and analog signal transmission for industrial and municipal water‑treatment applications.