What is your process for adding the seasoning packets to the noodle packs? I'm assuming the seasoning packet is added to the noodle package via a machine. If you have an engineering team available, you could devise a system based on sensor detection and moving guide rails. It would require the use of a sensor installed in the part of your process when seasoning packets are added to the noodle package. Here's my idea, which assumes that the packet is dropped into the noodle pouch in some way.
- As the seasoning packet is dropped into the noodle pouch, it passes in front of a sensor which can register disruptions in the sensor beam's path.
- If the sensor detects a packet passing in front of it, a guide rail or flap switches on the production line to guide the completed package towards the normal production path.
- The guide rail is timed based on your belt speed to activate as product approaches it. Therefore, while the sensor is not registering seasoning packets, the rail instead directs the line towards a rejection/rework channel. This channel would be intended for noodle packages that do not have seasoning packets added.
Well...it's a very convoluted and roundabout idea, but it was interesting to come up with! Scampi's suggestion is much more straightforward, but I wanted to brainstorm more 
. Here is a link to a sensor manual that may be suited for this process. I like Scampi's scale idea, but my only concern would be the rejection criteria of the scale involved. Would the scale's rejection criteria for expected weight with or without seasoning packet not conflict with the allowable weight variations in the rest of the product? Given that the seasoning only accounts for a small portion of the total weight, it may be difficult to tell when you're slightly low on noodles vs missing a packet.
