Teledyne GFC-7000T - Trace CO2 Analyzer - manual User Manual
Page 159
Operating Instructions
Model GFC7000TA Carbon Dioxide Analyzer
Teledyne Analytical Instruments
141
* This refers to the internal voltage level of the function NOT the output signal level
of the Test channel itself.
6.14. SETUP
MORE ALRM: Using the Gas Concentration
Alarms
The Model GFC 7000TA includes two CO
2
concentration alarms. Each alarm has a user settable limit,
and is associated with an opto-isolated TTL relay accessible via the status output connector on the
instrument’s back panel (See Section 6.15.1.1). If the CO
2
concentration measured by the instrument
rises above that limit, the alarm‘s status output relay is closed.
The default settings for ALM1 and ALM2 are:
Table 6-23: CO
2
Concentration Alarm Default Settings
ALARM STATUS
LIMIT SET POINT
1
ALM1
Disabled 100
ppm
ALM2
Disabled 300
ppm
1
Set points listed are for PPM. Should the reporting range units of measure be changed (See Section 6.7.6) the
analyzer will automatically scale the set points to match the new range unit setting.
Note
To prevent the concentration alarms from activating during span calibration
operations make sure to press CAL or CALS button prior to introducing span gas
into the analyzer.