Ultima X Series Gas Monitor Internal Relays; Relay Specifications; Table A-2. Relay Specifications - MSA Ultima X Series Installation & Maintenance Instructions Manual

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.
See Ultima Controller and Calibrator Manual (P/N 813379) for complete
relay configuration information.
Power cable wiring lengths for the Ultima X Series Gas Monitor with
internal relays differ from models without internal relays (TABLE A-1).
Table A-1. Cable Length and Wire Size for Units
With Internal Relays
GAS SENSOR DC
TYPE OUTPUT VOLTAGE
SUPPLY
Oxygen
or Toxic 3 Wire 12 VDC
24 VDC
Combustible 3 Wire 12 VDC
24 VDC
XIR 3 wire 12 VDC
24 VDC
• 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.

Ultima X Series Gas Monitor Internal Relays

Relay Specifications

Table A-2. Relay Specifications

TEMPERATURE
RANGE
HUMIDITY
RELAYS 3 ALARMS SPDT FAULT
(NORMALLY-ENERGIZED)
RELAY At 125 or 250 VOLTS AC,
RATINGS NON-INDUCTIVE
At 30 Volts DC,
NON-INDUCTIVE
A-2
WIRE MAXIMUM
SIZE CABLE LENGTH
(AWG) WITHOUT HART
(FEET) (METERS)
16 2,500 762
16 8,000 2,438
16 900 274
16 3,000 914
16 400 152
16 2,500 762
-40 to +60°C (-40 to +140°F)
15 to 95% RH, non-condensing
(Single pole, double throw)
SPDT (Single pole, double throw)
5.0 Amps or 5 Amps @ 1/10 Hp
5.0 Amps or 5 Amps @ 1/10 Hp
MAXIMUM
LOAD
RESISTANCE
(OHMS)
250
500
250
500
250
500