Teledyne 3010TA, Operating Instructions Manual, Page: 27 / 101

Oxygen Analyzer Part I: Control Unit
Part I: 3-5
Alarm Relays: The three alarm-circuit connectors are spring terminals
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 rear panel. They are capable of switching up to 3 am-
peres at 250 V ac into a resistive load. See Figure 3-6. 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 fail-safe or non-fail-safe.
• Can be configured as latching or nonlatching.
• 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 fail-safe or non-fail-safe.
• Can be configured as latching or nonlatching.
• Can be configured out (defeated).
System Alarm: Actuates when DC power supplied to circuits is
unacceptable in one or more parameters. Permanently
configured as fail-safe and latching. Cannot be de-
feated. Actuates if self test fails.
(Reset by pressing
I/O
button to remove power. Then
press
I/O
again and any other button EXCEPT
System
to resume.
Further detail can be found in chapter 4, section 4-5.
Figure 3-6: Types of Relay Contacts