Teledyne 3010MA – Paramagnetic oxygen analyzer, no 0-100% range – (superceded) - Manual (Page 53)

Paramagnetic O2 Purity Analyzer Operation
Teledyne Analytical Instruments 53
4.5 The Alarms Function
The Model 3010MA is equipped with 2 fully adjustable
concentration alarms and a system failure alarm. Each alarm has a relay
with a set of form “C" contacts rated for 3 amperes resistive load at 250 V
ac. See Figure in Chapter 3, Installation and/or the Interconnection
Diagram included at the back of this manual for relay terminal
connections.
The system failure alarm has a fixed configuration described in
chapter 3 Installation.
The concentration alarms can be configured from the front panel as
either high or low alarms by the operator. The alarm modes can be set as
latching or non-latching, and either failsafe or non-failsafe, or, they can be
defeated altogether. The setpoints for the alarms are also established using
this function.
Decide how your alarms should be configured. The choice will
depend upon your process. Consider the following four points:
1. Which if any of the alarms are to be high alarms and which if
any are to be low alarms?
Setting an alarm as HIGH triggers the alarm when the oxygen
concentration rises above the setpoint. Setting an alarm as LOW triggers
the alarm when the oxygen concentration falls below the setpoint.
Decide whether you want the alarms to be set as:
• Both high (high and high-high) alarms, or
• One high and one low alarm, or
• Both low (low and low-low) alarms.
2. Are either or both of the alarms to be configured as failsafe?
In failsafe mode, the alarm relay de-energizes in an alarm
condition. For non-failsafe operation, the relay is energized in an alarm
condition. You can set either or both of the concentration alarms to
operate in failsafe or non-failsafe mode.
3. Are either of the alarms to be latching?
In latching mode, once the alarm or alarms trigger, they will
remain in the alarm mode even if process conditions revert to non-alarm
conditions. This mode requires an alarm to be recognized before it can be
reset. In the non-latching mode, the alarm status will terminate when
process conditions revert to non -alarm conditions.