5Methods
102 Operation Manual
GC Output Signals
Signal is the GC output to a data handling device, analog or digital. It can be a detector output
or the output from flow, temperature, or pressure sensors. Two signal output channels are
provided.
Signal output can be either analog or digital, depending on your data handling device. Analog
output is available at either of two speeds, suitable to peaks with minimum widths of
0.004 minutes (fast data rate) or 0.01 minutes (normal rate). Analog output ranges are 0 to 1 V,
0 to 10 V.
Digital output rates are set by your Agilent data system, such as OpenLAB CDS or MassHunter
Workstation.
See Table 11 for the conversions from units shown on the GC display to units as shown in
Agilent data systems and integrators.
When outputting a column pressure signal, the GC reports the pressure in absolute units. For
example, an inlet pressure of 68.9 kpa would be reported as 170.2 kpa.
Analog signals
If you use an analog recorder, you may need to adjust the signal to make it more usable. Zero
and Range in the Signal parameter list do this.
Analog zero
Zero Subtracts value entered from baseline. Either select On to set Zero at the current signal
value, or enter a number between -500,000 and +500,000 as the setpoint to subtract from the
baseline.
Table 11 Signal conversions
Signal type 1 display unit is equivalent to:
Detector:
FID, NPD 1.0 pA (1.0 10
-12
A)
FPD+ 150 pA (150 10
-12
A)
TCD 25 uV (2.5 10
-5
V)
ECD 1 Hz
Analog input board (use to connect the GC to
non-Agilent detector)
15 µV
Nondetector:
Thermal 1 C
Pneumatic:
Flow
Pressure
Diagnostic
1 mL/min
1 pressure unit (psi, bar, or kPa)
Mixed, some unscaled
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