User guide

Installation Model 2120XL
Teledyne Analytical Instruments 22
Alarm Relays: The nine alarm-circuit connector pins connect to the
internal alarm relay contacts. Each set of three pins provides one set of
Form C relay contacts. Each relay has both normally open and normally
closed contact connections. The contact connections are shown in Table
3-2. They are capable of switching up to 3 amperes at 250 VAC into a
resistive load. The connectors are:
 Threshold Alarm 1:
 Can be configured as high (actuates when concentration 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 concentration 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).
Table 3-2: Alarm Relay Contact Pins
Pin Contact
45 Threshold Alarm 1, normally closed contact
28 Threshold Alarm 1, moving contact
46 Threshold Alarm 1, normally open contact
42 Threshold Alarm 2, normally closed contact
44 Threshold Alarm 2, moving contact
43 Threshold Alarm 2, normally open contact
36 System Alarm, normally closed contact
20 System Alarm, moving contact
37 System Alarm, normally open contact