Teledyne GFC-7000T - Trace CO2 Analyzer - manual - 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.