Teledyne 3020M - Explosion proof paramagnetic oxygen analyzer - Manual (Page 29)

Percent Paramagnetic Oxygen Analyzer Installation 3
3-7 Teledyne Analytical Instruments
3.3.4 Alarm Relays
There are three alarm-circuit connectors on the alarm relays block
(under RELAY OUTPUTS) for making connections to internal alarm relay
contacts. Each provides a set of Form C contacts for each type of alarm.
Each has both normally open and normally closed contact connections. The
contact connections are indicated by diagrams on the connector panel. They
are capable of switching up to 3 amperes at 250 VAC into a resistive load.
See Figure 3-6.
Figure 3-6: Types of Relay Contacts
The connectors are:
Threshold Alarm 1: • Can be configured as high (actuates when concen-
tration is above threshold), or low (actuates when
concentration is below threshold).
• Can be configured as failsafe or non-failsafe.
• Can be configured as latching or non-latching.
• Can be configured out (defeated).
Threshold Alarm 2: • Can be configured as high (actuates when concen-
tration is above threshold), or low (actuates when
concentration is below threshold).
• Can be configured as failsafe or non-failsafe.
• Can be configured as latching or non-latching.
• Can be configured out (defeated).
System Alarm: Actuates when DC power supplied to circuits is
unacceptable in one or more parameters. Permanently
configured as failsafe and latching. Cannot be de-
feated. Actuates if self test fails.
To reset a System Alarm during installation, discon-
nect power to the instrument and then reconnect it.
Further detail can be found in chapter 4, section 4-10.