Teledyne GFC-7000T - Trace CO2 Analyzer - manual - Manual (Page 82)

Operating Instructions Model GFC7000TA Carbon Dioxide Analyzer
Teledyne Analytical Instruments 64
Besides SAMPLE and SETUP, other modes the analyzer can be operated in are:
Table 6-1: Analyzer Operating modes
MODE MEANING
DIAG One of the analyzer’s diagnostic modes is being utilized (See Section 6.13).
M-P CAL This is the basic, multi-point calibration mode of the instrument and is activated by pressing
the CAL key.
SAMPLE Sampling normally, flashing indicates adaptive filter is on.
SAMPLE A Indicates that unit is in SAMPLE Mode and AUTOCAL feature is activated.
SETUP
1 SETUP mode is being used to configure the analyzer (CO
2
sampling will continue during this
process).
SPAN CAL A Unit is performing span cal procedure initiated automatically by the analyzer’s AUTOCAL
feature.
SPAN CAL M Unit is performing span cal procedure initiated manually by the user.
SPAN CAL R Unit is performing span cal procedure initiated remotely via the RS-232, RS-4485 or digital i/o
control inputs.
ZERO CAL A Unit is performing zero cal procedure initiated automatically by the analyzer’s AUTOCAL
feature.
ZERO CAL M Unit is performing zero cal procedure initiated manually by the user.
ZERO CAL R Unit is performing zero cal procedure initiated remotely via the RS-232, RS-4485 or digital I/O
control inputs.
1 The revision of the Teledyne Instruments software installed in this analyzer will be displayed following the word
SETUP . E.g. “SETUP G.4 ”
Finally, the various CAL modes allow calibration of the analyzer. Because of its importance, this mode is
described separately in Section 7.
6.2. Sample Mode
This is the analyzer’s standard operating mode. In this mode the instrument is analyzing the gas in the
sample chamber, calculating CO
2
concentration and reporting this information to the user via the front
panel display, the analog outputs and, if set up properly, the RS-232/485/Ethernet ports.
NOTE
A value of “XXXX” displayed in the CO2 Concentration field means that the M/R
ratio is invalid because CO2 REF is either too high (> 4950 mVDC) or too low (<
1250 VDC).