Teledyne OT-3 operating instructions Relay Ratings

Trace Oxygen Analyzer Installation

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

Teledyne Analytical Instruments 17