1. Basic Check Link Principles
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Basic Check Link Principles
General Idea for a Check Rod
System, Orientation, and Adjustments
Lead in sheet.
Covering the different aspects of PROCESS WEIGHING.
Hardware, configuration, simple application examples, system trouble shooting and calibration.
The propose of process weighing is to insure product quality and to deliver a standard product.
Weighing gives you a way of tracking each ingredient from the start to finish.
If each scale system was slightly off in weight the end product and profits will suffer.
Remember whenever you complete working on a scale system, verify operation and weight readings.

2. System Overview Load Points have some built-in lateral and
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System Overview
Load Points have some built-in lateral and
horizontal restrains, but these are limited
in scope.
Protecting the load sensors and keeping the
scale vessel on the load points sometimes
require additional mechanical assistance.
The following screens have several suggestion.
At each page there is an opportunity to try the new information on a demo instrument. Try to identify the menu, section, or parameter talked about on each slide before proceeding.
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3. 2/16/2019
Orientation
This Check rod set up will reduce the scales movement in both lateral directions. Two opposite corners are usually sufficient to protect a vessel. With more violent applications three corners would require check links.
Installation manuals are available on the web, to help install and maintain your scale system.
The load sensor and mounts may be purchased separately. Mounts are only sold as complete assemblies and most individual parts are not available. The exception is the rocker pins for the advantage load points. Custom mounts are possible on some models of load sensors. Other load sensors are made to only function in a mount designed for that load cell. Contact Hardy Instruments if you are thinking of using an alternate mount assembly. Where Hardy does not make custom mounting system, we have seen applications and will be able to help identify which load cell is best suited for your application.
When replacing a defective load cell or sensor, you do not need to replace the mounting hardware. Only replace the sensor portion. Replace the mounts only if you note damage or corrosion to the existing mounting hardware. That is why the model number on the load point assembly is that of the load cell/sensor and not the load point.

4. A Typical Check Link Installation tips
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A Typical Check Link Installation tips
Install double nuts to lock the Gap.
Base
Hand Tighten
The strain gauges are bonded or glued to the inside of the Load sensor to form a Wheatstone bridge.
Rated capacity is determined by the amount of deflection when weight is applied.
The load cell body is machined to achieve full deflection at the rated load.
The load or force must be applied straight down on the load cell to avoid side loading and weighing errors.
Because of this manufacturing technique, load cells with similar capacities are also physically the same size.
Caution must be used to not mix load sensor capacities, Mv/V rating, or load resistances.
Load cells mounted upside down will produce a negative signal output. Just switching the wires are not always the answer. The physical form or design of the load sensor creates a single direction of use.
Consult your load cell installation guide to insure your load cell installation will function and provide linear weight readings.
The Web tech knowledge at the Internet site is there to assist you in trouble shooting most system problems, 7-24.

5. Two examples of a simple check rod system
Two examples of a simple check rod system. Where the gap between the nuts and plate are .010” top gap at empty and .015” bottom gap. This will stop the movement before it can cause damage. You will want to double nut to prevent the gap setting from changing.
LOAD
.010” gap
.015” gap
Load cell movement
stopped by nuts.