Outputs
Relays
Relay Specifications
Table 1-2. Relay Specifications
RELAYS
3 ALARMS
SPDT (Single pole, double throw)
FAULT
(NORMALLY-ENERGIZED)
SPDT (Single pole, double throw)
HORN RELAY
SPST (Single pole, single throw), N/O
RELAY
RATINGS
At 125 or 250 VOLTS AC,
NON-INDUCTIVE
5.0 Amps
AT 30 VOLTS DC,
NON-INDUCTIVE
5.0 Amps
AT 1/10 HP
5.0 Amps
Alarm Relays
There are three alarm relays, a fault relay and a horn relay in
the Toxgard II Gas Monitor.
NOTE: Alarms are automatically disabled at the following
times to avoid "nuisance" alarms:
• during first minute of power-up, while cell stabilizes
• during calibration and for two minutes
following calibration.
Alarm Features
There are alarm levels in the Toxgard II unit, and a relay for
each level. There are many user-selectable alarm features
enabled or disabled by selecting or de-selecting them.
• Relays are standard electromechanical devices chosen for long
life and high reliability.
• Relay contacts are brought out to the terminal block and
used to control external lights, horns, and other equipment
(FIGURE 1-6).
• Alarms generally default to 10, 20 and 30% of the full-scale
reading and are set when the gas reading is above these
values.
• The Oxygen Model is a special case where:
• Caution is set to 19.5%, negative acting
• Warning is set to 18% oxygen, negative acting
• Alarm is set to 22% oxygen, positive acting.
Chapter 1, Set-up
1-12
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