Rockwell Automation 1442 Eddy Current Probe System - Manual (Page 8)

8 Rockwell Automation Publication ICM-UM004C-EN-E - February 2014
Preface
You can find the gap between the sensor and the target by measuring the sensor
impedance if the following relationships are identified:
• Relationship between the sensor and the target gap.
• Relationship of the sensor impedance.
System Configuration
Example This system is designed to fulfill the specifications when used under the following
configuration.
Figure 1 - System Configuration Example
IMPORTANT Always combine the components of this system (sensor, extension cable,
and driver) to configure it as follows. If this system is not configured as
shown below, or if the 1442 extension cable is not used in combining the
1442 sensor and driver, the output characteristics will differ dramatically.
Sensor Extension Cable System Cable Length Driver
(1)
0.5 m (1.64 ft) + 4.5 m (14.76 ft) = 5.0 m (16.40 ft)
→
1442-DR-xx50
1.0 m (3.28 ft) + 4.0 m (13.12 ft) = 5.0 m (16.40 ft)
→
1442-DR-xx50
0.5 m (1.64 ft) + 8.5 m (27.89 ft) = 9.0 m (29.53 ft)
→
1442-DR-xx90
1.0 m (3.28 ft) + 8.0 m (26.25 ft) = 9.0 m (29.53 ft)
→
1442-DR-xx90
(1) Where xx = appropriate code for probe size.