Teledyne 3000TA - General purpose trace oxygen analyzer - Manual (Page 28)

3 Installation Model 3000TA
3-6 Teledyne Analytical Instruments
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 3-5. 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 nonfailsafe.
• 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 failsafe or nonfailsafe.
• 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 failsafe and latching. Cannot be de-
feated. Actuates if self test fails.
(Reset by pressing button to remove power. Then
press again and any other button EXCEPT Sys-
tem to resume.
Further detail can be found in chapter 4, section 4-5.
Figure 3-5: Types of Relay Contacts