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8.0 MAINTENANCE
Routine maintenance of the canister style load cell should
include cleaning the electrical connectors, housings, and
mounting surfaces with solutions and techniques that will not
harm the physical material of construction. Make sure liquids
are not allowed to migrate into devices that are not
hermetically sealed. Such devices should only be wiped with
a damp cloth, and never be submerged or have liquids poured
on them. Never use a pressure washer on the load cells.
Yearly calibrations are recommended to ensure that the unit's
outputs match the factory specifications.
9.0 TROUBLESHOOTING
Proper performance of a load cell requires careful attention to
both electrical and mechanical aspects of the measurement
system. A basic understanding of the electrical and
mechanical installation requirements is recommended.
9.1 Mechanical Troubleshooting
A mechanical checklist includes:
1. Check for proper installation of fixturing.
2. Check integrity of the fixturing.
9.2 Electrical Troubleshooting
An electrical checklist should start with:
1.
Check cables for proper wiring and make sure
connections are secure and proper.
2.
Inspect for loose or dirty electrical connections.
3.
Check for improper shield grounds.
4.
Check for proper grounding of the structure that the
load cell is mounted on.
5.
Check the signal conditioning electronics for proper
setup.
6.
Check
the
insulation
conductors for short circuits.
7.
Check isolation resistance, load cell flexure to
conductors.
8.
Check load cell bridge resistances, (A-D) excitation
and (B-C) the signal leads.
9.
Check bridge balance.
CANISTER LOAD CELL OPERATION MANUAL
resistance
of
shielded
PCB Load & Torque
Toll-Free in USA 866-684-7107
10. Keep a record of your observations, correct problems,
or contact PCB factory for assistance.
10.0 CALIBRATION / REPAIR SERVICES
PCB Load & Torque offers calibration and repair services.
The PCB Calibration Laboratory in Farmington Hills,
Michigan is A2LA Accredited per ISO/IEC 17025.
Standard calibration certificates list five force points
ascending and one point descending. Additional data points
are available at extra cost upon request. A 60 K ohm (±0.1%)
shunt calibration resistor is supplied with each load cell
calibration.
Certificate information includes tabulated measurement
variable data zero balance, bridge input/output resistance,
computer nonlinearity and hysteresis, static error band (SEB)
calculations and entries abilities and traceability statements.
If an initial evaluation shows that a transducer requires repair,
PCB will provide the customer with an estimate prior to taking
any corrective
action.
10.1 RMA / Purchase Order
Please request a return material authorization (RMA) before
sending a load cell back to the factory for any reason. For
calibration services, if possible, a copy of the purchase order
covering the requested services should be included with the
returned load cell.
11.0 WARRANTY
Standard warranty on canister style load cells covers parts and
workmanship.
For full details, refer to the Warranty
Statement supplied with each load cell.
If the load cell is defective for reasons other than overloads,
return it to the factory for detailed evaluation. Factory
evaluation may show that the load cell is repairable or non-
repairable and if repair or replacement will be under warranty.
If not under warranty,
a
cost of repairs and recalibration
be
provided. Once authorization to proceed is received, a
delivery date will be provided.
716-684-0001
www.pcb.com
5
will
Manual Number: 56337
Manual Revision: A
Revision Date: 5/19/15
ECO Number: 44231
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