Absolute Process Instruments API 4380G – DIN‑rail RTD Signal Conditioner & Isolating Transmitter

The API 4380G is a compact, DC-powered RTD transmitter from Absolute Process Instruments designed for clean, reliable conversion of platinum RTD signals into standard analog outputs. From my experience, it’s the kind of module you drop into a panel when you need stable temperature measurements without fighting ground loops or noise from nearby drives. You might notice that the “G” variant runs on low-voltage DC, which makes it a natural fit for 24 VDC control cabinets and distributed I/O islands.

Company’s Order Placement Process and Guarantees

• Warranty period: 365 days
• Delivery time: typically 1 week for in-stock items; no more than one month at the latest
• Payment: 50% advance payment; full payment prior to delivery
• Express options: FedEx, UPS, DHL

Key Features

• RTD input flexibility – Supports Pt100 platinum RTDs, typically in 2-, 3-, or 4‑wire configurations for better lead compensation.
• Standard analog outputs – 4–20 mA or common voltage ranges (e.g., 0–10 V), so it drops into most PLC/DAQ analog cards without fuss.
• Galvanic isolation – Input, output, and power are isolated to reduce ground loops and noisy coupling from VFDs and high-current loads.
• DIN‑rail housing – Slim, panel-friendly enclosure for TS‑35 rail; wiring is straightforward and serviceable.
• Field rangeability – Typically offers trim for fine zero/span adjustment, useful during commissioning or quick sensor swaps.
• 24 VDC-friendly (G version) – Low-voltage DC power keeps it consistent with modern machine panels and distributed systems.
• Stable, low-drift design – In many cases, you’ll see better long-term stability than with generic head transmitters, especially in mixed-signal cabinets.

Technical Specifications

Application Fields

The API 4380G is commonly used wherever precise temperature monitoring needs to flow into a PLC or DCS as a clean analog value:

• Factory automation: machine temperature monitoring, heater control loops, and interlocks
• HVAC/process utilities: chilled water and heat tracing skids
• Food & beverage: jacketed tanks, CIP temperatures, and packaging tunnels
• Chemical and pharma: reactor jackets, filter dryers, environmental rooms
• Metals & plastics: extruder zones and annealing lines with high EMI nearby

A maintenance engineer told us it “quieted the noise” on a long RTD run next to VFD cables—after swapping in the 4380G, the trend finally stopped wandering.

Advantages & Value

• Reliability – Stable, low-drift conversion minimizes re-calibrations and nuisance alarms.
• Compatibility – Standard 4–20 mA/0–10 V outputs match most PLC/SCADA analog cards without extra converters.
• Cost savings – DIN‑rail form factor and multi-range capability reduce spare part counts and panel space.
• Noise immunity – True isolation helps when RTD leads run near motors or variable frequency drives.
• Support – We can assist with range selection and wiring verification; from my experience, that shortens commissioning time.

Installation & Maintenance

• Cabinet & rails – Mount on TS‑35 DIN rail inside a ventilated panel; keep low-voltage signals separated from high-voltage wiring when possible.
• Wiring – Use shielded twisted pair for RTD leads; land shields at one end only to avoid loops. Observe 2/3/4‑wire RTD terminal designations.
• Power – 24 VDC regulated supply is typical; confirm the available current margin when multiple modules share the same PSU.
• Safety – De-energize circuits before servicing; verify isolation ratings if mixing SELV and non‑SELV circuits.
• Commissioning – Set range and output, then fine-tune zero/span with a simulator or a calibrated RTD bath.
• Routine care – Annual verification is usually enough; check terminal tightness, clean dust, and document any trim changes.

Quality & Certifications

• Conformity: CE compliant; RoHS alignment for lead-free manufacturing in many cases
• Safety/agency: UL/cUL Recognized on many API 4300‑series builds (model-dependent)
• Factory quality: Manufacturer operates under ISO 9001 practices for consistent production
• Warranty: 365-day warranty from our company

Suggested Accessories & Supporting Components

• Pt100 RTD sensors (2/3/4‑wire) with appropriate sheath and lead length
• 24 VDC industrial power supply (with sufficient headroom for multiple modules)
• Shielded signal cable and ferrules for clean terminations
• TS‑35 DIN rail, end stops, and labeled terminal markers
• Portable RTD/temperature calibrator for on-site trimming