Teledyne 3190Z operating instructions Contact ID for Failsafe Relay Operation

Trace Oxygen Analyzer Installation

Alarm Relays: The three alarm circuit connectors are screw terminals for making connections to internal alarm relay contacts. There is one set of contacts for each type of alarm. Contacts are Form C, with normally open and normally closed contact connections capable of switching up to 0.5A at 125 VAC into a resistive load.

The alarm relay circuits are designed for failsafe operation, meaning the relays are energized during normal operation. If power fails the relays de-energize (alarms activated).

The contact connections are indicated diagrammatically on the rear panel as normally closed (NC), common (C), and normally open (NO). Figure 3-3 explains how these act in failsafe operation.

The specific descriptions for each type of alarm are as follows:

HI Alarm Configured as high alarm (actuates when concentration is above threshold). Can be set anywhere within the full range of the analyzer (1- 1,000 ppm), but must be set ABOVE the threshold set for the LO Alarm.

LO Alarm Configured as low alarm (actuates when concentration is below threshold). within the full range of the analyzer (1-1,000 ppm), but must be set BELOW the threshold set for the HI Alarm.

Sensor Fail Not active in this product

Figure 3-3: Contact ID for FAILSAFE Relay Operation

Teledyne Analytical Instruments 15