Download 7400 Plus - User Manual

7400 Plus
Instruction Manual
Table of Contents
1.
Safety and General Information .................................................................... 1
1.1.
1.2.
1.3.
1.3.1.
1.4.
1.5.
1.5.1.
1.6.
2.
Introduction ................................................................................................... 7
2.1.
2.1.1.
2.1.2.
2.1.3.
2.1.3.1.
2.1.3.2.
2.1.3.2.1.
2.1.4.
2.1.5.
2.1.6.
2.2.
2.3.
3.
Physical Components .......................................................................... 7
Motherboard ......................................................................................... 9
Internal Display Assembly .................................................................. 12
Input Options ...................................................................................... 13
Analog Input Option ........................................................................... 13
Bridge Sensor Input Option ................................................................ 14
Cat Bead Sensor Input Wiring Diagrams....................................... 16
4-20 mA Analog Output Option .......................................................... 18
Discrete Relay Option ........................................................................ 18
MODBUS RS-232/RS-485 Interface Option ....................................... 19
Using the Keypad ............................................................................... 21
Specifications ..................................................................................... 22
Physical Installation..................................................................................... 24
3.1.
3.2.
3.2.1.
3.3.
3.3.1.
3.3.2.
3.4.
3.5.
3.6.
3.7.
3.7.1.
3.7.2.
4.
Important Notices ................................................................................. 1
Certifications and Approvals................................................................. 1
Warnings, Cautions, and Notes............................................................ 2
General Warnings and Cautions .......................................................... 2
General Rules of Use ........................................................................... 3
Warranty............................................................................................... 4
Contacting Scott Health & Safety ......................................................... 4
Acronyms Quick Reference.................................................................. 5
Installation Considerations ................................................................. 24
Mounting the 7400 Plus ..................................................................... 24
Optional NEMA 7 Explosion Proof Enclosure..................................... 25
Electrical Configurations..................................................................... 26
Electrical Codes ................................................................................. 26
Optional External Power Supply......................................................... 26
Evaluating Wire Length and Size ....................................................... 27
Sensor Head Wiring ........................................................................... 28
Cat Bead Sensor Initial Setup ............................................................ 29
Calibration .......................................................................................... 35
Determining Span Gas to Use............................................................ 37
Sensor Calibration Procedure ............................................................ 37
Operation .................................................................................................... 40
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087-0041 Rev B