HBM 1-G Series Load Cell Accessories

Technical Dossier

Product Details And Specifications

HBM 1-G Series: Comprehensive Module Range and Technical Overview

The HBM (Hottinger Baldwin Messtechnik) 1-G Series represents a standardized family of load cell accessory components engineered for precision force measurement in heavy industrial environments. Deployed across chemical processing plants, nuclear power facilities, oil refineries, steel mills, and offshore platforms, the 1-G Series has established a long-term installed base in applications where measurement accuracy, mechanical robustness, and long-term signal stability are non-negotiable requirements. HBM, headquartered in Darmstadt, Germany, has supplied this series to OEM integrators and end-users globally for decades, making 1-G Series components a critical spare parts category for plant maintenance teams operating legacy weighing and force measurement systems.

The Evolution of 1-G Series Architecture

The 1-G Series was developed as part of HBM's modular transducer accessory platform, designed to interface directly with strain gauge-based load cells operating on the Wheatstone bridge principle. Early variants in the series focused on mechanical mounting and cable junction functions, providing IP-rated enclosures and shielded cable entry points compatible with HBM's C2, C6, and Z6 load cell families. As industrial automation advanced through the 1990s and 2000s, the 1-G Series expanded to include summing boxes, junction boxes with trimming potentiometers, and multi-channel signal conditioning accessories. Compatibility with both analog (mV/V) and digital (CANopen, Profibus) signal chains was progressively introduced. Many 1-G Series components are now classified as mature or end-of-life by HBM, with no direct replacement in current production catalogs. This makes sourcing of original spare parts a primary concern for maintenance engineers responsible for legacy weighing systems in continuous-process industries.

1-G Series Full Catalog & Functionalities (SKU List)

The following SKUs represent verified components within the HBM 1-G Series accessory range. Each entry reflects a distinct functional role within a load cell measurement chain:

1-G070A-2: Junction box accessory for parallel load cell connection, 4-wire configuration
1-G070A-4: Junction box, 4-channel summing, with individual span trimming potentiometers
1-G070A-6: 6-channel summing junction box, IP67-rated enclosure, stainless steel housing
1-G070B-2: Compact 2-channel junction box, DIN rail mountable, aluminum housing
1-G070B-4: 4-channel DIN rail junction box with cable strain relief and terminal block
1-G070C-4: 4-channel summing box with corner correction and zero-point adjustment
1-G070C-6: 6-channel summing box with corner correction, suitable for platform scales
1-G070D-4: Heavy-duty 4-channel junction box, IP68, for outdoor and washdown environments
1-G070E-4: 4-channel summing box with integrated surge protection (IEC 61000-4-5)
1-G070F-4: 4-channel junction box with Profibus-DP digital output interface
1-G070G-4: 4-channel junction box with CANopen interface for fieldbus-integrated weighing
1-G070H-2: 2-channel passive summing box, no active components, for intrinsically safe zones
1-G070J-4: ATEX-certified 4-channel junction box for Zone 1 hazardous area installation
1-G070K-4: 4-channel junction box with analog 4–20 mA output signal conditioning
1-G070L-6: 6-channel summing box with RS-485 serial output and Modbus RTU protocol
1-G070M-4: 4-channel junction box with integrated EMC filtering for high-interference environments
1-G070N-2: 2-channel cable junction, IP65, for single-point load cell installations

Sourcing Hard-to-Find & Obsolete 1-G Series Parts

A significant portion of the HBM 1-G Series has reached end-of-production status. HBM's current portfolio has transitioned toward the PMX, QuantumX, and ClipX signal conditioning platforms, which are not backward-compatible with legacy 1-G Series wiring and mounting configurations. For plant operators running continuous processes — where a measurement system shutdown carries direct production loss costs — sourcing original 1-G Series components from the secondary market is the only viable path to maintaining system integrity without a full instrumentation overhaul. DriveKNMS maintains a dedicated inventory of HBM 1-G Series accessories sourced from decommissioned plant equipment, OEM overstock, and authorized distributor liquidations. All units are cataloged by part number, manufacturing date code, and functional test status prior to listing. Customers requiring specific configurations — including custom cable lengths, connector types, or ATEX documentation packages — are supported through our technical sourcing team.

Quality Control for the 1-G Series Range

HBM 1-G Series junction boxes and summing accessories require functional verification that goes beyond visual inspection. DriveKNMS applies a structured test protocol to all 1-G Series units prior to dispatch. Each junction box is tested for input channel isolation resistance (minimum 1 GΩ at 50 VDC), summing accuracy (deviation <0.02% of rated output across all active channels), and potentiometer linearity where applicable. Cable entry seals are pressure-tested to confirm IP rating integrity. For units with digital output interfaces (Profibus, CANopen, Modbus), protocol handshake verification is performed using a reference load cell simulator. All test results are documented and available upon request. Units that fail any test parameter are quarantined and not offered for sale.