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Getting Started Teledyne API – Model T400 Photometric Ozone Analyzer
48
Table 3-7: Control Input Pin Assignments
Input # Status Definition ON Condition
A
REMOTE ZERO CAL
The Analyzer is placed in Zero Calibration mode. The mode field of the
display will read ZERO CAL R.
B
REMOTE
LO SPAN CAL
The Analyzer is placed in Lo Span Calibration mode. The mode field of the
display will read LO CAL R.
C
REMOTE
SPAN CAL
The Analyzer is placed in Span Calibration mode. The mode field of the
display will read SPAN CAL R.
D, E & F Spare
Digital Ground
The ground level from the analyzer’s internal DC Power Supplies (same as
chassis ground).
U External Power input Input pin for +5 VDC required to activate pins A – F.
+
5 VDC output
Internally generated 5V DC power. To activate inputs A – F, place a
jumper between this pin and the “U” pin. The maximum amperage through
this port is 300 mA (combined with the analog output supply, if used).
3.3.1.7. Connecting the Concentration Alarm Relay (Option 61)
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 API instruments. Each relay has
3 pins: Normally Open (NO), Common (C) and Normally Closed (NC).
Figure 3-11: Concentration Alarm Relay
Alarm 1 “System OK 2”
Alarm 2 “Conc 1”
Alarm 3 “Conc 2”
Alarm 4 “Range Bit”
“ALARM 1” RELAY
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.
06870C DCN6332