sensors

SG Load Cell

Resistive strain gauge load cell designed for dynamic load monitoring and high-frequency data acquisition.

Capacity
200, 500, 1000, 2000 kN
Rated Output
2.0 mV/V (Nominal)
Accuracy
±0.5% F.S.

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Overview

Resistive strain gauge load cell designed for dynamic load monitoring and high-frequency data acquisition.

The Geolook SG (Strain Gauge) Load Cell is a high-capacity force sensor designed for measuring loads in tiebacks, rock bolts, and structural cables where dynamic response is required. Unlike Vibrating Wire cells which are optimized for static, long-term monitoring, the SG Load Cell utilizes a foil strain gauge Wheatstone bridge configuration. This technology provides an instantaneous analog voltage output, making it capable of capturing rapid load fluctuations, such as traffic loads on bridges, wind gusts on guy wires, or impact loads during pile testing.

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Benefits & Features

  • Instantaneous response time for dynamic monitoring
  • Standard mV/V analog output
  • High-strength alloy steel construction
  • Temperature compensated full-bridge design
  • Compatible with high-speed industrial data loggers
  • Center-hole design for strands and bolts
  • IP67 / IP68 protection available

Detailed Description

VW vs. SG: Which to choose?

The choice depends entirely on 'Time' and 'Cable Length':

  • Choose VW (G74-V750): For static, long-term monitoring (e.g., checking a dam anchor once an hour for 20 years). Better for very long cables.
  • Choose SG (G74-F750): For dynamic events (e.g., measuring the impact of a truck crossing a bridge). VW sensors are too slow to catch these spikes.

Wheatstone Bridge Technology

The sensor utilizes a set of bonded foil strain gauges arranged in a full Wheatstone bridge circuit. As the steel cylinder compresses under load, the resistance of the gauges changes linearly.

This setup provides excellent temperature stability (as thermal effects cancel out across the bridge) and a standardized output that connects easily to almost any industrial data acquisition system (DAQ) or PLC.

Installation & Cables

Because SG cells output a voltage signal (millivolts), they are more susceptible to signal drop over very long cables compared to VW sensors. For cable runs exceeding 100m, we recommend using a local signal conditioner (4-20mA transmitter) or a 6-wire sensing circuit to compensate for lead resistance.

Available Models

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Specifications

Capacity
200, 500, 1000, 2000 kN
Rated Output
2.0 mV/V (Nominal)
Accuracy
±0.5% F.S.
Bridge Resistance
700 Ω or 350 Ω
Safe Overload
150% F.S.
Material
High Strength Alloy Steel
Operating Temp
-30°C to +80°C