Moment Insensitive Single Point LOAD CELL OBU Series

Product catalog summary

OBU Series Load Cells Overview

The OBU series consists of moment insensitive single point load cells designed primarily for industrial and laboratory scales but suitable for a broad range of force measurement applications. These load cells are optimized for measuring low forces cost-effectively, featuring robust construction and high accuracy.

Models and Ranges

OBUG: Capacities from 0.5 kg up to 35 kg, with mounting threads M3x0.5 or M6x1 depending on capacity.
OBUC: Capacities from 5 kg to 100 kg, with M6x1 mounting threads.
OBUH: Capacities from 50 kg to 1000 kg, with M8x1.25 mounting threads.

Key Features

Moment insensitive design for accurate single point load measurement.
Environmental protection rated at IP65 standard, with optional IP67 sealing for OBUC and OBUH models.
Constructed from anodised aluminium alloy for low weight (stainless steel versions available on request).
Sense wire facility on OBUC and OBUH models to compensate for voltage drops along the cable.
Overload stops available for mechanical protection.
High accuracy with low non-linearity, hysteresis, and repeatability errors.
Wide operating temperature range (-30°C to +80°C depending on model).
3-year warranty and ATEX certification (EEx ia IIC T4) available.

Specifications Summary

Model	Capacity Range (kg)	Max Platform Size (mm)	Rated Output (mV/V)	Non-Linearity (% of Rated Capacity)	Hysteresis (% of Rated Capacity)	Repeatability (% of Rated Capacity)	Operating Temp Range (°C)	Environmental Protection
OBUG	0.5 to 35	200x200 (0.5-2kg), 350x350 (3-35kg)	2.0 ±10%	<1.0	<0.002	<0.002	-20 to +80	IP65
OBUC	5 to 100	400x400	2.0 ±10%	<10.0	<0.002	<0.002	-10 to +70	IP65 (IP67 optional)
OBUH	50 to 1000	600x600	2.0 ±10%	<10.0	<0.0015	<0.006	-30 to +70	IP65 (IP67 optional)

Electrical Characteristics

Input Resistance: Approximately 350 to 415 ohms depending on model.
Output Resistance: Approximately 350 ohms.
Recommended Excitation Voltage: 10 VDC or VAC.
Maximum Excitation Voltage: 15 VDC or VAC.

Mechanical and Installation Details

Mounting threads vary by model and capacity (M3, M6, M8).
Dimensions and mounting hole patterns provided for each model (see outline drawings).
Cable options include 4-core or 6-core cables with lengths customizable.

Wiring and Compensation

OBUC and OBUH models include sense wires (+ve and -ve sense) to compensate for voltage drops in the load cell cable, improving measurement accuracy. The wiring schematic includes excitation and output lines with sense wires noted.

Options and Additional Information

Other capacity ranges available on request.
Stainless steel versions for harsh environments.
Can be supplied calibrated as a system with compatible instrumentation.
Equivalents to other manufacturers' load cells available.
Integration support for finished weighing platforms.

Manufacturer Contact

Applied Measurements Limited
3 Mercury House, Calleva Park, Aldermaston, Berkshire, RG7 8PN, UK
Tel: +44 0118 981 7339
Fax: +44 0118 981 9121
Email: [email protected]
Website: www.appmeas.co.uk

Note: Continuous product development may result in minor specification changes.

Catalog excerpts

Moment Insensitive Single Point LOAD CELL OBU Series-1

Moment Insensitive Single Point LOAD CELL High Accuracy Robust Construction Sense wire facility Excellent Performance/Price Ratio Options Available Other Ranges available on request Equivalents to other manufacturers available IP67 Sealing option on OBUC & OBUH Integration into a Finished Weighing Platform Stainless Steel versions rvailable on request Can be supplied calibrated as a system with any of our Instrumentation range The OBU series of moment insensitive single point load cells were primarily engineered for use and integration within industrial and laboratory scales, they are however equally suited for use in a wide range of force measurement applications. The design of the OBU accompanied by the volume manufacturing techniques employed to build this series of load cells makes it an ideal solution for applications where low forces are to be measured within a tight Environmental sealing to IP65 (IP67 optional) gives the series added protection when in use in damp or wet environments, whilst overload stops are easily employed to give added mechanical protection. The OBU is constructed from anodised aluminium alloy, giving it a low self weight. The OBUC & OBUH are provided with sense wires for compensation of voltage drops along the load cell cable. Transducer Specialists. APPLIED MEASUREMENTS LIMITED 3 MERCURY HOUSE - CALLEVA PARK - ALDERMASTON - BERKSHIRE - RG7 8PN - UK

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Moment Insensitive Single Point LOAD CELL OBU Series-2

Wiring Schematic Diagram NOTE sense wires on OBUC & OBUH only {as standard) OBUG Outline Drawing OBUC Outline Drawing OBUH Outline Drawing APPLIED MEASUREMENTS LIMITED Continuous product development may result in minor changes to published specifications.

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