MSA Ultima - Relay Specifications; Relays; Ultima Gas Monitor Internal Relays

Table C-1. Power Cable Distances for the Ultima Gas Monitor with
Internal Relays (4-20 mA or Frequency Output Models)
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
IR COMBUSTIBLE 12 VDC 16 AWG 500 300 OHMS
IR COMBUSTIBLE 24 VDC 16 AWG 3800 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.
Ultima Gas Monitor Internal Relays
Relay Specifications
Table C-2. Relay Specifications
TEMPERATURE RANGE
-20 to +50
o
C (-4 to +122
o
F)
HUMIDITY
15 to 95% RH, non-condensing
RELAYS
2 ALARMS
SPST (Single pole, single throw)
FAULT
(NORMALLY-ENERGIZED)
SPST (Single pole, single throw)
RELAY
RATINGS
At 125 or 250 VOLTS AC,
NON-INDUCTIVE
5.0 Amps or 5 Amps @ 1/10 Hp
AT 30 VOLTS DC,
NON-INDUCTIVE
5.0 Amps or 5 Amps @ 1/10 Hp
POWER
CONSUMPTION
(TOTAL UNIT
WITH RELAYS)
OXYGEN AND TOXICS
7 to 30 VDC @ 220 mA max.
CATALYTIC
COMBUSTIBLES
7 to 30 VDC @ 610 mA max.
IR COMBUSTIBLE
10 to 30 VDC @ 410 mA max.
Appendix C, Internal Relay Option
C-4