MSA Ultima X Series Instruction Manual

Power cable wiring lengths for the Ultima X Series Gas Monitor
with internal relays differ from models without internal relays
(TABLE A-1).
NOTE: To avoid electrical noise problems, do not run
AC lines from relays in the same conduit or cable
tray as the DC Signal lines.
TABLE A-1. Power Cable Distances for the Ultima X Series Gas
Monitor with Internal Relays (4-20 mA Model)
SENSOR TYPE
POWER
SUPPLY
VOLTAGE
WIRE SIZE
MAXIMUM
CABLE LENGTH
(IN FEET)
MAXIMUM LOAD
RESISTANCE
(mA OUTPUT
ONLY)
CATALYTIC
COMBUSTIBLE
12 VDC 16 AWG 900 300 OHMS
CATALYTIC
COMBUSTIBLE
24 VDC 16 AWG 3000 600 OHMS
TOXIC OR OXYGEN 12 VDC 16 AWG 2500 300 OHMS
TOXIC OR OXYGEN 24 VDC 16 AWG 8000 600 OHMS
• In all installations, twisted instrument-quality cable is
recommended.
• Shielded cable is recommended in situations where radio
frequency interference (RFI), electro-magnetic interference
(EMI) or other electrical noise sources exist or are anticipated.
Appendix A, Internal Relay Option
A-5

MSA Ultima X Series Specifications

General

Brand	MSA
Model	Ultima X Series
Category	Measuring Instruments
Language	English