Might have a punt on that. Like the idea of metering ASM. Need to check the spec and suitability at a time when I haven't just got back from the pub.
Prodominantly PVC and it's electromagnetic. Gives a capacity per stroke and I assume you vary the stroke rate.
Metering pumps I've played with in the past have been plunger pumps with a constant speed and variable stroke.
Think I'll pass if anyone else want a crack at it.