Description
Core Product Summary
The Eurotherm Action Instruments G448-0002 is a DIN rail-mounted signal conditioner and field-configurable isolator designed for strain gauge and bridge sensor inputs. Belonging to the Ultra SlimPak series, it accepts low-level millivolt signals from load cells, pressure transducers, or strain gauges and provides conversion to industry-standard analog DC current or voltage outputs. Its compact form factor allows high-density installation in control enclosures while maintaining full three-way galvanic isolation between input, output, and power terminals.
Engineered for precision instrument interfacing, the module provides a regulated 1 to 10 VDC adjustable excitation supply capable of driving up to 120 mA, making it suitable for powering multiple 350 Ω bridges in parallel. The unit accepts full-scale input spans from 10 mV to ±200 mV and features DIP-switch configurable output options, including 4–20 mA, 0–20 mA, 0–1 mA, 0–5 V, and 0–10 V. Operating on a 18 to 30 VDC supply, the G448-0002 utilizes wide-ranging zero and span potentiometers for precise calibration across bi-directional, expansion, or compression strain measurement applications.
Key Technical Specifications
| Specification Parameter | Verified Value |
| Product Series | Ultra SlimPak Series |
| Module Type | Bridge / Strain Gauge Input Field-Configurable Isolator |
| Input Ranges (Full Scale) | 10 mV to ±200 mV (11 field-selectable DIP switch settings) |
| Input Impedance | > 1 MΩ |
| Bridge Excitation Supply | Adjustable 1 VDC to 10 VDC, up to 120 mA maximum drive |
| Configurable Analog Outputs | Voltage: 0–5 V, 0–10 V
Current: 0–1 mA, 0–20 mA, 4–20 mA |
| Galvanic Isolation | 1800 VDC between input, output, and power terminals |
| Accuracy | ±0.1% typical, ±0.2% maximum of selected input range at 25°C |
| Zero / Span Calibration Adjustment | Wide-ranging potentiometers allowing up to 50% offset and gain adjustments |
| Supply Voltage Range | 18 to 30 VDC |
| Power Consumption | 2.5 W typical (single 350 Ω bridge), 4.0 W maximum (four 350 Ω bridges) |
| Operating Temperature Range | 0°C to 55°C (32°F to 131°F) |
| Terminal Wiring Capacity | Screw terminals for 12 to 22 AWG wire |
| Enclosure Dimensions (H × W × D) | 90 mm × 17.5 mm × 110.2 mm (3.54 in × 0.689 in × 4.34 in) |
Detailed Product Overview
The Eurotherm Action Instruments G448-0002 serves as a specialized signal conditioning interface between bridge-based sensor hardware and industrial measurement architectures. In automated process systems, signal paths connected to load cells or strain-gauge pressure transducers often suffer from ground loops, high-frequency electrical noise, and long cable voltage drops. The G448-0002 addresses these signal integrity issues by isolating millivolt-level inputs directly near the sensor and converting them into high-level, noise-immune current or voltage signals suitable for Programmable Logic Controllers (PLCs), Remote Terminal Units (RTUs), and SCADA analog input cards.
A core advantage of the module is its integrated bridge excitation supply, which eliminates the need for external transducer power sources. Capable of supplying up to 120 mA, a single G448-0002 can deliver regulated excitation voltage across up to four 350 Ω strain gauge bridges connected in parallel. Internal ASIC technology underpins the conditioning circuit, providing consistent linearity and thermal stability across industrial operating environments.
The device offers DIP-switch configurable input and output ranges alongside trim potentiometers. The input stage covers 11 fixed range settings, with fine-tuning controls that allow the span to be contracted down to 50% of the selected scale. This permits tailored calibration for expanded, compressed, or bi-directional measurement ranges (such as tension/compression load monitoring or vacuum/pressure scales) without requiring custom factory calibration. Front-mounted diagnostic LEDs provide immediate local operational status by indicating power availability and out-of-range signal conditions.
G448-0002
G448-0002
System Compatibility & Integration Requirements
| Item / Dependency | Verified Compatibility or Requirement | Practical Note |
| Mounting Hardware | Standard 35 mm DIN Rail | 17.5 mm slim housing allows high-density side-by-side panel mounting. |
| Transducer Type | Full-bridge strain gauge / load cell sensors | Accepts 0.5 mV/V to >50 mV/V sensitivity ranges. |
| Bridge Excitation Drive | Up to 120 mA total drive capacity | Powers up to four 350 Ω load cells or transducers in parallel. |
| Power Supply | Nominal 24 VDC (Accepts 18 to 30 VDC) | Requires standard industrial 24 VDC panel power source. |
| Control System I/O Interface | Standard analog I/O modules (4–20 mA, 0–10 V, etc.) | DIP switch configured to match PLC/DCS analog input card specifications. |
| Field Wiring | Screw clamp terminals | Accepts solid or stranded conductors from 12 to 22 AWG. |
Dimensions, Mounting & Connection Notes
- Dimensions: 90 mm high × 17.5 mm wide × 110.2 mm deep (3.54 in × 0.689 in × 4.34 in).
- Weight: Approximately 245 g (0.54 lbs).
- Mounting Method: Direct snap-on mounting on standard 35 mm DIN rail.
- Electrical Connection: Integrated screw terminals designed for 12 to 22 AWG wire sizes.
- Isolation Rating: 1800 VDC continuous galvanic isolation between input, output, and power connection paths.
- Environmental Limits: Designed for operating ambient temperatures between 0°C and 55°C (32°F to 131°F) and relative humidity between 15% and 95% at 45°C (non-condensing).
FAQ
What is the Eurotherm G448-0002?
The Eurotherm G448-0002 is a DIN rail-mounted, field-configurable signal conditioner and isolator built for strain gauge, load cell, and bridge sensor inputs.
Which product family does the G448-0002 belong to?
It belongs to the Eurotherm Action Instruments Ultra SlimPak series of high-density signal conditioning modules.
What excitation voltage does the module provide to strain gauge sensors?
The G448-0002 features an adjustable excitation supply from 1 to 10 VDC with a maximum output drive of 120 mA.
What analog outputs can be configured on the G448-0002?
The module supports DIP switch-selectable output signals including 0–5 V, 0–10 V, 0–1 mA, 0–20 mA, and 4–20 mA.
What level of electrical isolation does this signal isolator offer?
It provides 1800 VDC three-way galvanic isolation between the input, output, and DC power supply circuits.
What power supply voltage is required for operation?
The unit operates on a standard DC supply input range of 18 to 30 VDC.
How many load cells can a single G448-0002 power?
With its 120 mA maximum excitation drive, it can supply power for up to four 350 Ω bridge transducers connected in parallel.
Documented Performance Data
- Accuracy: ±0.1% typical, ±0.2% maximum of selected full-scale input range at 25°C.
- Temperature Stability: ±0.025%/°C typical, ±0.05%/°C maximum drift of full-scale input range.
- Maximum Output Noise: 0.1% of span RMS or 10 mV, whichever is greater.
- Response Time: < 100 ms step response (10% to 90%).
- Diagnostic Flash Indications: Diagnostic LED flashes at 4 Hz for negative/under-range inputs (<0%) and 8 Hz for over-range inputs (>110%).
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