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11.3 Cable Resistance Guide; 11.4 Catalytic Sensors - Honeywell 5701 Operating Instructions Manual

Sieger system 57.
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MAN0443.P65 Issue 13 Aug 04
05701-M-5001 A02279
CHAPTER 4 - INSTALLATION INSTRUCTIONS

11.3 Cable Resistance Guide

A guide to the resistance of various copper cable sizes is given below:
Cross Sectional Area (mm˝) Maximum resistance at 20°C (ohm/km)
0.50
0.75
1.00
1.50
2.50
Cross Sectional Area (mm˝) Maximum resistance at 20°C (ohm/km)
0.50
0.75
1.00
1.50
2.50

11.4 Catalytic Sensors

The maximum line resistance of cabling for a catalytic sensor varies
with the current and voltage requirements of the type of sensor installed.
It is also subject to a maximum of 10V permitted across terminals S
and NS at the Field Interface/Relay Card.
Maximum line loop resistance is calculated as follows:
R
L
Where:
R
=
L
V
=
s
I
=
s
Solid Copper Conductor
Stranded Copper Conductor
10 - V
s
=
I
s
Total Line Resistance (ohms)
Sensor Voltage (V)
Sensor Current (A)
4 - 21
5701 Control System
38.0
25.3
19.0
12.6
7.6
36.8
24.5
18.4
12.3
7.4

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