Checkline R55 - Manual (Page 3)

Plug & Test
TM
Smart Force & Torque Sensors User’s Guide
2
1 OVERVIEW
1.1 General Overview
Several series of Plug & Test
TM
sensors are available to accommodate numerous force and torque
measurement requirements – from 0.25 to 10,000 lbF (1 N to 50 kN) of force, and from 10 ozFin to 5,000
lbFin (7 Ncm to 550 Nm) of torque. These sensors can be handheld or mounted to a fixture or test stand
for more sophisticated testing requirements.
Plug & Test
TM
sensors are used with Mark-10 7i, 5i, and 3i indicators. They may be disconnected from
one indicator and connected to another without the need for re-calibration or re-configuration. All such
data is saved within a PCB located inside the smart connector.
The model number, serial number, and capacity of the sensor are identified in the rectangular label
located on the Plug & Test
TM
connector. The model and serial numbers are also identified in the
Information screen of the indicator. Refer to the indicator user’s guides for more information.
1.2 Accuracy and Resolution
Indicator accuracy must be combined with sensor accuracy to determine the total accuracy of the system.
Since sensors may be used with the 7i, 5i or 3i indicators, the accuracy of the indicator being used must
be identified and taken into account, as follows:
Indicator Model Accuracy
7i / 5i ±0.1% of full scale
3i ±0.2% of full scale
The total system accuracy can be calculated by adding the sensor accuracy and indicator accuracy.
Refer to the following examples:
Example 1
Model MR01-100 sensor with Model 5i Indicator
MR01-100
±0.15% of full scale
+
5i
±0.1% of full scale
=
Total
±0.25% of full scale
This translates into a fixed error of up to:
0.25% x 100 lbF = 0.25 lbF
Example 2
Model MR50-50Z sensor with Model 3i Indicator
MR50-50Z
±0.35% of full scale
+
3i
±0.2% of full scale
=
Total
±0.55% of full scale
This translates into a fixed error of up to:
0.55% x 50 ozFin = 0.275 ozFin
Because accuracy is defined as a percentage of full scale, the fixed error is possible anywhere on the
scale from 0 to the capacity. As such, this value represents an increasingly large error as percentage of
reading towards the low end of the scale. It is, therefore, recommended that a sensor is selected with
capacity as close as possible to the expected load.