Teledyne 3290 - OEM percent oxygen analyzer - Manual (Page 30)

Installation Model 3290
Teledyne Analytical Instruments 20
The specific descriptions for each type of alarm are as follows:
HI Alarm
Configured as high alarm (actuates when
concentration is above threshold). Can be set
anywhere between 1 and 25 %, but must be set
ABOVE the threshold set for the LO Alarm.
LO Alarm
Configured as low alarm (actuates when
concentration is below threshold). Can be set
anywhere from 1 to 25 %, but must be set BELOW
the threshold set for the HI Alarm.
Sensor Fail
Actuates when the output of the oxygen sensor falls
below the pre-programmed level, typically 0.05%..
Figure 3-2: Contact Identification for FAILSAFE Relay Operation
Optional RS-232 Port: The digital signal output is a standard RS-
232 serial communications port used to connect the analyzer to a modem
or other digital device. Only the output mode is implemented in this
instrument. The data is concentration information in serial digital form.
The RS-232 protocol allows some flexibility in implementation in
the choice of values for certain parameters. Table 3-1 lists the RS-232
values required by the Model 3290 implementation.
Note: The RS-232 port is an optional feature and is not present
on all instruments.