ABB S26 Series Operating Instruction

ABB S26 Series Operating Instruction Manual pdf 21 page image

5.6 Off-line Threaded Connection Seal (S26TT)The off-line threaded remote seal connects directly to a process pipe via the NPT connection in the lower housing. Connectionsfor 1/4, 1/2, 3/4, 1, and 1-1/2 in. process piping are available. In addition to the process connection, mechanical support for theweight of the seal may be required, especially for the 1/4 and 1/2-inch pipe sizes.These elements are available with a flushing connection in the lower housing. The connection provides a 1/4 in. NPT port into thecavity around the seal diaphragm to permit flushing to remove trapped solids, when necessary. The flushing connection alsoprovides a means of checking calibration without disconnecting the element. A gate or ball valve installed in the process line nearthe seal element connection allows the process to be isolated and calibration pressure can then be applied via the flushingconnection. Use of a gate or ball type valve avoids restricting the process line during normal operation, not a gasket.Connect the seal element to the process pipe at the NPT connection in the end of the lower housing.If the element has a flushing connection, connect a flushing line with appropriate valving to the 1/4 in. NPT connection in the sideof the lower housing.THREADEDPROCESSCONNECTIONGASKETØ D134 (5.27)QFLUSHINGCONNECTIONS(two 1/4 in. NPT-f)Figure 20: Off-line threaded connection diaphragm sealSize (thread) Dimensions mm (in) for S26TD (dia) Q1/4 in. NPT 109.2 (4.3) 53.3 (2.1)1/2 in. NPT 109.2 (4.3) 53.3 (2.1)3/4 in. NPT 109.2 (4.3) 63.5 (2.5)1 in. NPT 109.2 (4.3) 63.5 (2.5)1 1/2 in. NPT 109.2 (4.3) 63.5 (2.5)S26TT can be supplied with different kinds of bolts: stainless steel AISI 316, carbon steel or alloy steel (NACE compliant)For any other detailed information regarding S26TT seals such as pressure limits, vacuum service recommendations, processtemperature limits, temperature effects and configuration, please refer to product datasheet.2600T Series Pressure transmitters | OI/S266-EN Rev. B 21