Trace Oxygen Analyzer Installation
Teledyne Analytical Instruments 17
The specific descriptions for each type of alarm are as follows:
Power Fail Alarm: This alarm changes state when the AC or DC
system power is lost.
Alarm #1: Programmable as high or low alarm (actuates when
concentration is above threshold). Can be set anywhere between 0
and 9999ppm, but must be set ABOVE the threshold set for Alarm 2.
Alarm #2: Programmable as high or low alarm (actuates when
concentration is below threshold). Can be set anywhere from 0 to
9999ppm.
CAUTION: THERE COULD BE HAZARDOUS VOLTAGE AT THE
ALARMS TERMINALS, EVEN WHEN POWER IS
REMOVED FROM THE INSTRUMENT.
3.3.4 Relay Ratings
The 3300/OT-3 has 2 relay ratings.
• Higher rating —established by the manufacturer
DC Rating: 0-30 VDC maximum @ 2.0 Amps
(resistive)
AC Rating: 125 VAC maximum @ 0.5 Amps
minimum reliable switching rating:
10 µA @ 10mV
• Lower rating—maximum safe rating for Cl 1 Div 2 Group
C or D hazardous location
DC Rating: 0-30 VDC maximum @ 0.9 Amps
maximum
AC Rating: 125 VAC maximum @ 0.2 Amps
maximum
minimum reliable switching rating:
10 µA @ 10mV
To safely use the alarm relays in a hazardous location, the
characteristics of both the switched voltage and the components or load
being operated must be known. The alarm relays must not be attached to