MS495-90  ABB  Operator unit

The driving liquid produces the required torque, which varies as a function of the gear position, to rotate the gears.

For example, the torques on the lower gear in the left side of Fig. 2-1 cancel each other while the torque on the upper gear is one sided and actually causes the rotation. Around the upper gear a bounded crescent like volume exists which is pushed towards the outlet of the meter. Each rotation of the pair of oval gears transports a defined liquid volume.

The number of rotations is therefore an exact measure of the quantity of liquid which has flowed through the meter. The precision teeth assure a good seal between the two gears. The clearance between the oval gears and the walls of the measuring chambers is so small that the leakage flow (gap loss) is negligible.

The rotations of the pair of oval gears are transmitted without a stuffing box to an indicator either by a permanent magnet coupling or by a feedback-free magnetic field controlled pulse transmitter.

The gears and bearings are subject to mechanical wear. Through selection of materials for the housing, oval gears, and bearings as well as by design consideration of expansions due to high temperatures, oval gear totalizers are suitable for almost all operating conditions.

The error limits shown in Fig. 2-3 represent the relationship to the measuring medium, especially as a function of its viscosity. For low viscosities and a given accuracy the span is appreciably smaller than for higher viscosities.

The structure and details of the product：

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