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Teledyne ML - T100 UV Fluorescence SO2 Analyzer
3.4.7. CONNECTING THE CONCENTRATION ALARM RELAY (OPTION 61)
3.4.7.1. "ALARM 1" RELAY
3.4.7.2. "ALARM 2" RELAY & "ALARM 3" RELAY
The concentration alarm option is comprised of four (4) "dry contact" relays on the rear
panel of the instrument. This relay option is different from and in addition to the
"Contact Closures" that come standard on all Teledyne ML instruments. Each relay has
3 pins: Normally Open (NO), Common (C) and Normally Closed (NC).
Figure 3-11:
"System OK 2"
Alarm 1
"Conc 1"
Alarm 2
"Conc 2"
Alarm 3
"Range Bit"
Alarm 4
Alarm 1, which is "System OK 2" (system OK 1 is the status bit), is in the energized
state when the instrument is "OK" and there are no warnings. If there is a warning
active or if the instrument is put into the "DIAG" mode, Alarm 1 will change states.
This alarm has "reverse logic" meaning that if you put a meter across the Common and
Normally Closed pins on the connector you will find that it is OPEN when the
instrument is OK. This is so that if the instrument should turn off or lose power, it will
change states and you can record this with a data logger or other recording device.
Alarm 2 relay is associated with the "Concentration Alarm 1" set point in the software;
Alarm 3 relay is associated with the "Concentration Alarm 2" set point in the software.
Alarm 2 Relay
SO
2
Alarm 3 Relay
SO
2
Alarm 2 Relay
SO
2
Alarm 3 Relay
SO
2
Alarm 2 relay will be turned on any time the concentration value exceeds the set-point,
and will return to its normal state when the concentration value returns below the
concentration set-point.
Even though the relay on the rear panel is a NON-Latching alarm and resets when the
concentration goes back below the alarm set point, the warning on the front panel of the
instrument will remain latched until it is cleared. You can clear the warning on the front
panel either manually by pressing the CLR button on the front panel touch-screen or
remotely through the serial port.
Concentration Alarm Relay
Alarm 1 = xxx PPM
Alarm 2 = xxx PPM
Alarm 1 = xxx PPM
Alarm 2 = xxx PPM
Getting Started
49
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