The sight glasses / flow indicators DA 4.00 - 4.30

with two borosilicate glasses. A good view of the fluid is provided by the two opposite glasses.

DA 4.00 without indicator device, for basically visual control.
Installation position:
» any position

DA 4.10 with internal indicator flag, for constant flow direction.
Nominal diameters G 3/8 - G 1 and DN 15 - 25 are without resetting spring as standard, subsequent installation is possible. All others are with resetting spring.
Installation position:
» with resetting spring any position
» without resetting spring horizontal with flag downwards, vertical only with flow from below upwards

DA 4.30 with impeller, for constant flow direction:
Installation position:
» horizontal or vertical, for small flow rates (v < 1 m/s)