Avery Weigh-Tronix Technical Specification T302

T302
super-precision load cell
Description
A hermetically sealed load bearing
unit operating in compression to
produce an analogue output which
is proportional to the applied load.

Construction
100% stainless steel, natural finish.

Capacities
23 tonne 50,000 lb.
45 tonne 100,000 lb.
Accuracy 5000d as standard.

Examples of Use

• Road weighbridges

• Rail weighbridges

• Tank weighing

• Hopper weighing

• Process control

Special Features • Unique, low torque, anti-

rotation load button design. Specification
• 100% stainless steel
construction.
• Fully compatible with 8701 for
approved as well as non- Environment

•
approved applications. Resistance to Dirt & Moisture
Surge arresters fitted internally
to provide protection against
lightning damage
• An electrically, mechanically
and chemically tough
The load cell has been designed to
exceed IP68 rating.

(See application note on polyurethane sheathed cable. Electrical Disturbance

lightning protection). Custom designed to obtain the Immune to electrical distur-
optimum electrical balance bance including RFI as detailed in
• Special ATEX version, approved
for use in hazardous areas to


properties required for high
accuracy weighing
EN45501:1992.
Storage Temperature Range
CENELEC standards. applications in industrial - 30O C to + 85O C.
40 metre cable length only. environments.

• Supplied ready-assembled • 23 tonne and 45 tonne cells

approved to OIML R60 for
Operating Temperature Range
- 20O C to + 60O C.
with gaiters and load buttons 5000 divisions. Calibrated Temperature Range
for simple installation. - 10O C to + 40O C.
T302 Avery Weigh-Tronix Technical Specification

Specification
50,000 lb/100,000 lb 23 tonne/45 tonne
Excitation Electrical (Recommended) 10 - 12 v, AC or DC 10 - 12 v, AC or DC
Excitation Electrical (Maximum) 20 v, AC or DC 20 v, AC or DC
Terminal Resistance Input at 20o C 560 - 620 Ω 560 - 620 Ω
Terminal Resistance Output at 20o C 480 Ω Nominal 480 Ω Nominal
Rated Output 1.75 mV/V ± 0.1% 1.75 mV/V ± 0.1%
(at 50 klb/100 klb) (at 50 klb/100 klb)
Zero Balance ± 1% of Rated Output ± 1% of Rated Output
Combined Error ±0.03% of Rated Output ±0.013% of Rated Output
Repeatability 0.01% of Rated Output 0.01% of Rated Output
30 min Creep and Zero Return (OIML R60) ± 0.01% of Rated Output ± 0.01% of Rated Output
Temperature Effect on Rated Output (-10o C to + 40o C) ± 0.0008%/o C ± 0.0008%/o C
Temperature Effect on Zero Balance (-10o C to + 40o C) ± 0.0009%/o C ± 0.0009%/o C

Overload Rating (without affecting Performance) 150% Rated Capacity 150% Rated Capacity
Overload Rating (Ultimate) >225% Rated Capacity >225% Rated Capacity
Insulation Resistance (Minimum) >5,000 MΩ >5,000 MΩ

Hazardous Area Version
Electrical Termination
4 core 7 x 0.12 mm or equivalent. Special ATEX version approved for Umax in 24 V
Standard length 25 metres. use in hazardous areas to CENELEC
Hazardous area version, 40 metres. Imax in 400 mA
Outer tinned copper sheath. standards.
Wmax in 1.3 W
(floating)
Certificate No. Leq 31 µH
Overall sheath. DEMKO 01 ATEX 129328X Ceq 33 nF
Input: Black - Green + Classification EEx ia IIC T6.
Output: Red - White + ATEX CAT II 1 G D

Screen
Lin T
Green

T
White

Sa1 Sa2

Black
T
Red

Circuit Diagram.
Avery Weigh-Tronix Technical Specification T302

Applications
This transducer is designed to Normal Load Off-Centre Load
operate with loads applied through
the central axis of the cell. For high
accuracy weighing applications
Side Force
the load cell is protected from side
forces and/or off centre loads by
mounting it as a double pendle
(strut) unit.

Tie bars or bumper stops will be

required to restrict horizontal
movement of the load platform.
The cell can be mounted either way
up.

Typical Vehicle Weighing

Applications
In the weighbridge application
shown below, the strut unit pro-
vides the cell with the optimum
loading conditions needed for high
accuracy vehicle weighing.

Load Cell Strut Assembly

Illustration shows a typical Avery Weigh-Tronix load cell concrete weighbridge.

T302 Avery Weigh-Tronix Technical Specification

Dimensions

Ø 120

15

184 236

92

15

Ø 76

Ø 100

55

Minimum 30
clearance

All dimensions in millimetres

© Avery Weigh-Tronix Limited 2009. All rights reserved. This publication is issued to provide outline information only which, unless agreed by Avery Weigh-Tronix Limited in writing, may not be regarded as a representation relating
to the products or services concerned. Avery Weigh-Tronix Limited reserves the right to alter without notice the specification, design, price or conditions of supply of any product or service.

Your local distributor:

Foundry Lane, Smethwick,

E mail: info@awtxglobal.com West Midlands, England B66 2LP.
Internet: http://www.averyweigh-tronix.com Tel: +44 (0)845 3 667788 Fax: +44 (0)845 246 6799

Produced by Avery Weigh-Tronix Publicity Department T302/11.09/Issue 4