2. Model Definition

51304650: Base model for 16-channel galvanically isolated non-HART analog input FTA

-100: Standard baseline PCB grade

Basic full-board moisture & dust resistant conformal coating for standard clean cabinet operating conditions

Standard bidirectional TVS transient, ESD surge suppression per isolated channel

Single-stage RC low-pass EMI filter for low-noise clean control room environments

Independent per-channel galvanic isolation barriers to eliminate field-DCS ground loop circulating currents

Standard capacity isolated loop current limiting resistors for short-circuit overload protection of transmitters and IOP inputs

Basic physical channel isolation partitions to reduce inter-channel analog signal crosstalk

3. Technical Specifications

Channel Count: 16 fully independent channels with full galvanic isolation per channel

Compatible Field Devices

Two-wire conventional non-HART 4–20mA transmitters: pressure, differential pressure, flow, level, RTD/TC temperature, pH, ORP, dissolved oxygen, conductivity analytical transmitters

FTA Structure: Passive isolated termination board without built-in power supply; integrated per-channel single-stage filtering, standard surge protection and short-circuit current limiting

PCB Protection: Basic standard conformal coating; flammability UL94 V0

Terminal Type: Compression screw terminals compatible with solid/stranded copper wire up to 14 AWG; independent isolated positive/negative terminal pair for each channel

Form Factor: Standard B-size footprint, snap-on DIN rail mounting for standard 35 mm rails

Operating Ambient: 0℃ ~ +60℃ clean indoor cabinet; limited tolerance for elevated humidity, dust or corrosive vapors; not suitable for salt fog or chemical fume atmospheres

Circuit Architecture Parameters

Single-stage low-pass filtering to suppress low-level ambient electromagnetic interference

Standard bidirectional TVS suppresses positive/negative transient high voltage on isolated input loops

Galvanic isolation barrier eliminates measurement drift caused by ground potential offset between separate grounding grids

Calibrated standard-tolerance isolated current-limit resistors prevent transmitter burnout and IOP high-impedance input damage during field short faults

Basic isolation partitions minimize inter-channel analog bleed and cross-input measurement interference

Redundancy Support: Fully compatible with primary/standby redundant isolated non-HART AI IOP; hot-swap FTA replacement without shutdown permitted

Approximate Unit Weight: 0.357 kg

4. Interface & Communication Configuration

Inner IOP Connection: Locking flat ribbon cable directly mates to isolated non-HART AI IOP pin headers. Standard cable strain relief prevents pin header deformation under routine wiring harness tension.

Field Outer Terminals: Independent isolated Ch+ / Loop– terminals for each two-wire transmitter loop; field excitation circuit fully galvanically separated from DCS control ground potential.

Signal Mechanism: Pure DC 4–20mA analog process measurement signals; no HART signal coupling circuitry integrated.

No auxiliary communication ports: Only analog measurement signal transmission supported.

5. Core Functions

Full per-channel galvanic isolation: Eliminates circulating ground loop currents at multi-ground sites, resolving unstable PV readings and measurement drift.

Single-stage standard EMI noise rejection: Suppresses low-level ambient EMI in clean cabinet environments to reduce minor measurement jitter.

Standard surge & short-circuit protection: Withstands low-magnitude wiring transients and switching arcs to protect high-impedance IOP input circuits.

Stable loop excitation protection: Fixed current limiting safeguards field transmitters against burnout from accidental field short circuits.

Uniform input linear consistency: Matched passive components deliver consistent measurement response across all 16 channels for simplified calibration.

Redundant hot maintenance: Seamlessly follows primary/standby IOP switching; single-channel disconnection and inspection do not affect the other 15 measurement loops.

6. Application Scenarios

Applicable Industries

Light manufacturing process control, municipal clean water treatment, standard humidity pharmaceutical batch production lines, low-noise light petrochemical auxiliary facilities

Typical Measurement Loops

General pressure/differential pressure monitoring transmitters

Conventional flow rate measurement transmitters

Storage tank level monitoring transmitters

Standard RTD/TC temperature measurement transmitters

Clean water pH/conductivity analytical transmitters

Suitable for single-ground control room layouts, low-VFD low-noise process areas, dry clean cabinet atmospheres with minimal dust accumulation. Not applicable for high-humidity, dusty, corrosive or salt-fog cabinet environments.

7. Wiring Standards

Two-wire transmitter wiring: Transmitter positive → isolated FTA Ch+, transmitter negative → isolated Loop–; reversed polarity creates minor measurement offset.

Cable selection: Shielded twisted-pair instrument cable for all field runs; shield grounded only once at DCS cabinet FTA side with field end ungrounded to suppress ground loop noise.

Power cable separation: Maintain moderate physical separation between analog instrument cables and high-voltage AC power wiring to limit EMI coupling.

8. Incompatible Hardware

Isolated HART AI (51304644), isolated non-HART AO (51304640), isolated HART AO (51304648), non-isolated AI/AO FTAs, discrete DI/DO termination boards, TC/RTD dedicated FTAs, pulse counter and serial communication termination blocks cannot pair with this isolated non-HART AI IOP card.