Figure 3-12: Concentration Alarm Relay - Teledyne T200 Operation Manual

Teledyne API – T200 NO/NO
3.3.1.7. CONCENTRATION ALARM RELAY (OPTION 61)
06858E DCN7057
/NO Analyzer Operation Manual
2 X
The concentration relay option provides four (4) "dry contact" relays on the rear panel
(Figure 3-12), each with 3 pins: Common (C), Normally Open (NO), and Normally
Closed (NC).
Figure 3-12:
Alarm 1 "System OK 2"
Alarm 2 "Conc 1"
Alarm 3 "Conc 2"
Alarm 4 "Range Bit"
―A 1‖ R
LARM 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 a meter across the Common & Normally Closed
pins on the connector will show 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 can be
recorded with a data logger or other recording device.
―A 2‖ R & ―A
LARM ELAY
The "Alarm 2 Relay" is associated with the "Concentration Alarm 1" set point in the
software, and the "Alarm 3 Relay" on the rear panel is associated with the
"Concentration Alarm 2" set point in the software.
Alarm 2 Relay
Alarm 3 Relay
Alarm 2 Relay
Alarm 3 Relay
The Alarm 2 Relay will be turned on any time the concentration set-point is exceeded
and will return to its normal state when the concentration value returns below the
concentration set-point.
Although the relay on the rear panel is a NON-Latching alarm that resets when the
concentration returns below the alarm set point, the warning on the front panel display
will remain latched until it is cleared. Clear the front panel warning on by either
touching the CLR menu button or going 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 T200
instrument can monitor both NO & NO
configuring the alarms with 2 alarm levels for each gas.
NO Alarm 1 = 20 PPM
NO Alarm 2 = 100 PPM
Concentration Alarm Relay
3‖ R
LARM ELAY
NO Alarm 1 = xxx PPM
NO Alarm 2 = xxx PPM
2
NO Alarm 1 = xxx PPM
X
NO Alarm 2 = xxx PPM
X
gas. The software for this instrument allows
2
Getting Started
39