Teledyne GFC-7001T - Trace CO Analyzer - Manual (Page 51)

Getting StartedTeledyne API – Model T300/T300M CO Analyzer
Teledyne Analytical Instruments 51
Figure 3-13: Concentration Alarm Relay
Alarm 1 “System OK 2”
Alarm 2 “Conc 1”
Alarm 3 “Conc 2”
Alarm 4 “Range Bit”
“A LARM 1” R ELAY
Alarm 1 which is “System OK 2” (system OK 1, is the status bit) is in the energized
state when the instrument is “OK” & 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 &
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.
“A LARM 2” R ELAY & “A LARM 3” R ELAY
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
CO Alarm 1 = xxx PPM
Alarm 3 Relay CO
2
Alarm 2 = xxx PPM
Alarm 2 Relay CO Alarm 1 = xxx PPM
Alarm 3 Relay CO
2
Alarm 2 = xxx PPM
The Alarm 2 Relay will be turned on any time the concentration set-point is exceeded &
will return to its normal state when the concentration value goes back below the
concentration set-point.
Even though the relay on the rear panel is a NON-Latching alarm & 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 by either pushing the CLR button on the front panel or through the serial port.
In instruments that sample more than one gas type, there could be more than one gas
type triggering the Concentration 1 Alarm (“Alarm 2” Relay). For example, the
GFC7001TM instrument can monitor both CO & CO
2
gas. The software is flexible
enough to allow you to configure the alarms so that you can have 2 alarm levels for each
gas.
CO Alarm 1 = 20 PPM