Endress+Hauser Proservo NMS83 Operating Instructions Manual page 18

Installation
18
5.1.2 Mounting without a guide system
NMS8x is mounted on a nozzle of the tank roof without a guide system. Sufficient
clearance inside the nozzle is necessary to allow the displacer to move without hitting the
inner walls (for details of D, →  19).
 5 No guide system
D Inner diameter of the tank nozzle
1
d Diameter of the displacer
1 Displacer
D
1
1
d
Proservo NMS83
A0026908
Endress+Hauser