Wafer Sensors, Alignment, Nominal Sensor Size

Quick Installation Guide

00825-0100-4664, Rev BB January 2013

Rosemount 8712 / 8700 Series

Wafer Sensors

Gaskets

The sensor requires a gasket at each of its connections to adjacent devices or piping. The gasket material selected must be compatible with the process fluid and operating conditions. Metallic or spiral-wound gaskets can damage the liner. Gaskets are required on each side of a grounding ring. See Figure 8 below.

Figure 8. Wafer gasket placement

Spacer Installation

Horizontal meters Vertical meters

O-ring

Alignment

1.On 1.5 through 8-inch (40 through 200 mm) line sizes. Rosemount strongly recommends installing the alignment spacers provided to insure proper centering of the wafer sensor between the process flanges. Sensor sizes of 0.15, 0.30, 0.5 and 1 in. (4 through 25 mm), do not require alignment spacers.

2.Insert studs for the bottom side of the sensor between the pipe flanges and center the alignment spacer in the middle of the stud. See Figure 8 for the bolt hole locations recommended for the spacers provided. Stud specifications are listed in Table 3.

3.Place the sensor between the flanges. Make sure that the alignment spacers are properly centered on the studs. For vertical flow installations slide the oring over the stud to keep the spacer in place. See Figure 8. To ensure the spacers match the flange size and class rating for the process flanges see Table 4.

4.Insert the remaining studs, washers, and nuts.

5.Tighten to the torque specifications shown in Table 5. Do not overtighten the bolts or the liner may be damaged.

Table 3.	Stud Specifications

Nominal Sensor Size		Stud Specifications
0.15	– 1 inch (4 – 25 mm)	316 SST ASTM A193, Grade B8M Class 1 threaded mounted studs
1.5 –	8 inch (40 – 200 mm)	CS, ASTM A193, Grade B7, threaded mounting studs

NOTE

Sensor sizes of 0.15, 0.30, and 0.5 in. mount between AMSE 1/2-inch flanges. Using carbon steel bolts on sensor sizes of 0.15, 0.30, 0.5 and 1 in. (15 and 25 mm), rather than the required stainless steel bolts, will degrade the flow sensor measurement.