www.ittcontrols.com contact@ittcontrols.com
4
Section 1 Model 227A Dierential Pressure Indicator
The indicator movement has a micrometer screw for range adjustment. Zero
is adjusted by "slipping" the pointer on the hub. Both the zero and range ad-
justments can be made without removing the scaleplate or pointer. Linearity
adjustments are accessible when the scale plate is removed.
The orientation of the indicator mechanism varies with the case design. In the
universal case design (Figure 1.2), the torque tube extends through a hole in
the bottom half of the indicator, and the range adjust control is located in the
top half. In the inverted design (Figure 1.3, page 5), the torque tube extends
through a hole in the top half of the indicator, and the range adjust control is
The indicator is available in two case material variations. The standard Model
227A indicator has a black aluminum case, and the Model 227AS indica-
tor has a stainless steel case. Model 227A holds a fully-functional nuclear
structural integrity and pressure boundary integrity applications.
Figure 1.2—Indicator mechanism for universal case
To Next Page
Loading...