14 Flow and Pressure Modules
206 Operation Manual
PIDs
The behavior of a pressure control module is governed by a set of three constants, called P
(proportional), I (integral), and D (differential).
Certain gases or special applications (such as headspace vial pressurization, flow splitter, and
backflush applications) require different PIDs than those provided at the factory.
If you need to update or change the pneumatic PID values for an application, use the utility
program on the GC and GC/MS User Manuals & Tools DVD provided with the GC.
The table summarizes custom PID values required for selected applications. Note that if you
are updating an AUX EPC module, you will need to change the frit for the channel used. See
also “Restrictors.”
Table 24 PIDs and frits
Application Module AUX frit Select Available PID Values
Purged splitter and Deans Switch when
using backflush
AUX EPC No color or rings Quickswap
Purged splitter and Deans Switch AUX EPC 1 ring (or brown dot) Standard
Headspace vial pressurization AUX EPC No color or rings AUX_EPC_Headspace
Headspace sampling loop PCM in backpressure control PCM_Headspace
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