Honeywell 9782 Series - Manual (Page 85)

Input and Output Wiring
7/99 9782 Series Conductivity/Resistivity Analyzer/Controller - Operator’s Manual 6-3
Recommended maximum wire size
Table 6-1 Recommended Maximum Wire Size
Gage Number mm
2
Description
14 2.081 power and relays
see Parts List 0.823 inputs*
18 0.823 isolated outputs
* Automatic compensation for input lead resistance is available. See Section 10 for details.
Cables for locations without interference
For steel (metal) conduit or open wiring away from any sources of interference, use
recommended Honeywell cables listed in the parts list in Section 11.
Shielded wiring for locations with interference
In applications where plastic conduit or open wire trays are used, shielded 6-conductor 22 gage
(0.326 mm
2 ) or heavier signal input wiring is required.
Avoiding interference
Instrument wiring is considered Level 1, per section 6.3 of IEEE STD. 518 for plant facilities
layout and instrumentation application. Level 1 wiring must not be run close to higher level
signals such as power lines or drive signals for phase fired SCR systems, etc. Unprotected input
wiring in high electrical noise environments is subject to electromagnetic, electrostatic, and radio
frequency interference pickup of sufficient magnitude to overload input filters. The best
instrument performance is obtained by keeping the interfering signals out of the instruments
altogether by using proper wiring practices.
References
Refer to the following when wiring the unit.
•
IEEE STD. 518, Guide for the Installation of Electrical Equipment to Minimize Electrical
Noise Inputs to Controllers from External Sources.
•
Appropriate wiring diagram supplied with cells.