Process Connections Considerations; Kynar Inserts Connection; Screw Torques For Models With Kynar Inserts - ABB 2600T Series Instruction Manual

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Process connections considerations

266 differential pressure transmitter process connections on
the transmitter flange are 1/4 - 18 NPT, with a centers distance
of 54mm (2.13in) between the connections. The process
connections on the transmitter flange are on centers to allow
direct mounting to a three-valve or five-valve manifold.
Flange adapter unions with 1/2 - 14 NPT connections are
available as an option. Rotate one or both of the flange
adapters to attain connection centers of 51 mm (2.01 in),
54 mm (2.13 in) or 57 mm (2.24 in).
To install adapters, perform the following procedure:
1 Position the adapters with the O-ring in place.
2 Bolt the adapters to the transmitter using the bolts
supplied.
3 Tighten the bolts to a torque value of 25Nm (stainless steel
bolts) or 15Nm (for Stainless steel NACE bolts).
Deviations for models 266Mx, 266Rx and for PTFE O-rings:
• pretightening hand-tight.
• Pretightening to 10 Nm.
• Final tightening to 50 Nm.
For model 266PS, 266VS and 266RS, it is only possible to have
one adapter, with low pressure side flange without process
connection and drain/vent valve.
For high static model (266DSH.x.H) tighten the bolts to a
torque value of 40 Nm (regardless of the material of the bolts
used). In case of PTFE O-rings, pretightening to 10 Nm and final
tightening to 50 Nm.

Kynar inserts connection

When connecting Pressure transmitters equipped with kynar
inserts tighten the bolts to 15 Nm max.
Screw torques for models 266MS and 266RS
with Kynar inserts
The following procedures apply to process flange screws and
nuts:
• Pretightening to 2 Nm (working crosswise).
• Pretightening to 10 Nm (working crosswise)
• Final tightening by a tightening angle of 180°, working in two
stages of 90° for each screw, and working crosswise.
Figure 26: Adapter
Figure 27: Kynar insert