Honeywell ToxyPoint, User Manual

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16 ToxyPoint User Manual
511407
Honeywell
6/07
Introduction
Cable Installation
Cable Installation
The distance the 4-20 mA signal can travel is dependent on several
factors including cable gauge. Maximum cable resistance is 650 ohms
less the controller resistance.
The table below assumes a constant 24 volt power supply (at 20C),
copper wire and a Controller resistance of 250 ohms. The signal range
from the Controller/PLC etc. to the ToxyPoint takes into account the
return loop. The distance shown is from the Controller to the
Transmitter.
Maximum Cable Lengths Between Controller and ToxyPoint
Conductor size Distance
22 AWG 0.64 mm 2,045 m (6,715 ft)
20 AWG 0.75 mm 3,253 m (10,953 ft)
18 AWG 1.00 mm 5,167 m (16,953 ft)
Recommended: Use shielded cable, or cable in conduit to
avoid electrical interference. The shield (including mylar)
must be grounded. Keeping the shield as short as possible,
tie the shield and extra wires to the electrical box grounding
screw. Pull 2-wire cable into the enclosure(s).
Output Signals: If accessing the output signal(s) at O/P1
and/or O/P2 additional wire(s) will be required from the
sensor. Wire as shown in the Alarm Outpus Installation
diagram.