2. Model Definition

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

-150: Medium reinforced PCB protection grade

Medium upgraded full-board conformal coating with improved resistance to humidity, dust and weak corrosive vapors vs -100

Moderate high-energy bidirectional TVS transient, ESD and line fault surge protection per isolated channel

Dual-stage cascaded RC low-pass EMI filter for medium-noise zones with small to medium VFD and MCC loads

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

Precision matched isolated loop current limiting resistors for uniform short-circuit overload protection

Thickened physical channel isolation partitions to reduce inter-channel analog signal crosstalk and leakage

3. Technical Specifications

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

Compatible Field Devices

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

FTA Structure: Passive isolated termination board with no internal power supply; integrated dual-stage filtering, medium-energy surge protection and short-circuit current limiting

PCB Protection: Medium upgraded conformal coating; flammability UL94 V0

Terminal Type: Compression screw terminals for solid/stranded copper wire up to 14 AWG; each channel has isolated Ch+ / Loop– pair

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

Operating Ambient: 0℃ ~ +60℃ indoor cabinet; wider humidity/dust/weak corrosion tolerance than -100; not rated for salt fog or strong corrosive fumes

Circuit Architecture Parameters

Dual-stage low-pass filtering to suppress medium-level EMI from VFDs and motor control centers

Medium-energy bidirectional TVS clamps positive/negative transient high voltage on isolated input loops

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

Tight-tolerance isolated current-limit resistors prevent transmitter burnout and IOP high-impedance input damage during field shorts

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

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

Approximate Unit Weight: 0.358 kg

4. Interface & Communication Configuration

Inner IOP Connection: Locking flat ribbon cable directly connects to isolated non-HART AI IOP pin headers. Reinforced cable strain relief prevents pin deformation under sustained 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.

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

No auxiliary communication ports; only analog signal transmission is supported.

5. Core Functions

Full per-channel galvanic isolation: Eliminates ground loop circulating currents at multi-ground sites to stabilize PV readings and remove measurement drift.

Dual-stage medium EMI noise rejection: Suppresses moderate electromagnetic interference from VFD and MCC equipment to reduce measurement jitter and fluctuation.

Medium-energy surge & short-circuit protection: Absorbs larger wiring transients and switching arcs to protect sensitive high-impedance IOP input circuits.

Reliable loop overload protection: Consistent current limiting prevents transmitter damage when field wiring is shorted.

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

Redundant hot-swappable operation: Seamlessly follows primary/standby IOP switching; single-channel disconnection does not disrupt the remaining 15 measurement loops.

6. Application Scenarios

Applicable Industries

General petrochemical auxiliary areas, medium chemical plants, standard power plant auxiliary monitoring, municipal wastewater treatment, mild-humidity pharmaceutical production lines

Typical Measurement Loops

General process pressure and DP transmitters

Conventional flow transmitters

Tank level monitoring transmitters

RTD/TC temperature transmitters

Water pH and conductivity analytical transmitters

Fit for multi-ground plant layouts, medium-noise VFD areas, cabinets with mild elevated humidity and moderate dust accumulation, low-concentration weak acid/alkaline vapor atmospheres. Not suitable for coastal salt fog, heavy corrosive chemical workshops.

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 at DCS cabinet FTA side, field end ungrounded to suppress ground loop noise.

Power cable separation: Separate analog instrument cables from high-voltage AC, MCC and VFD wiring to lower EMI coupling.

8. Incompatible Hardware

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