Does the FID detector require Nitrogen make up flow in Standby mode?

The FID typically has makeup flow of nitrogen or helium during normal operation.  If the system is simply idling between batches of samples, you can turn off the FID flame and all flows off.  When you start back up, allow 10-15 minutes for the baseline to stabilize.  During standby I would keep the FID temperature at its normal method setpoint.  If you want to lower it, keep it above 100 or the oven temperature, whichever is higher.

Thank you.  We typically don't run a lot of samples, so I would like to conserve gases as much as possible.  I will look at possibly switching to nitrogen rather than costly helium when the instrument is idling in standby mode as well.

We do offer a helium conservation module for 7890 and 88x0 GCs to automate that process.  More information can be found at https://www.agilent.com/en/product/gas-chromatography/gc-systems/helium-conservation-module-for-gc