ABB 266FF, Руководство по эксплуатации

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46 OI/266/FF-EN Rev. B | 2600T Series Pressure transmitters
11 Maintenance
– Respect the below table indications for reinstalling the process flanges.
Transmitter model and range Procedure
266DSH / PSH / VSH
Viton Gaskets All bolting Use a torque wrench to tighten the bolts to a torque of 25 Nm.
PTFE Gaskets
Carbon Steel NACE
and Stainless Steel Use a torque wrench to tighten the process flange nuts to a torque of 40 Nm, let the flange
stabilize for an hour, unscrew the nuts and tighten again to 25 Nm.
Stainless Steel
NACE Use a torque wrench to tighten the process flange nuts to a torque of 25 Nm, let the flange
stabilize for an hour and perform the final tightening to 25 Nm.
266DSH.x.H
(High static option)
Viton Gaskets All bolting Use a torque wrench to tighten the bolts to a torque of 31 Nm.
PTFE Gaskets All bolting
Use a torque wrench to tighten the process flange nuts to a torque of 40 Nm, let the flange
stabilize for an hour, unscrew the nuts and tighten again to 31 Nm.
266DSH range A
(1KPa)
All gaskets All bolting
Use a torque wrench to tighten the process flange screws/nuts to a torque of 14 Nm. Please be
aware that in case of bottom work disassembly and reassembly the original performances can not
be guarantee anymore.
266DSH / 266PSH
with Kynar inserts
All gaskets All bolting Use a torque wrench to tighten the process flange screws/nuts to a torque of 15 Nm
266MSx / 266RSx All gaskets All bolting
First, use a torque wrench to tighten the process flange screws/nuts to a joining torque of
- MJ = 2 Nm (0.2 kpm), working in a crosswise manner.
- Then tighten them with a torque MJ = 10 Nm (1.0 kpm), working in a crosswise manner
- Then tighten them fully by turning each nut or screw again (in a crosswise manner) by the
tightening angle A = 180°, working in two stages of 90° each.
Some transmitter versions are using screws with size M10. If this screws are used the tightening
angle A = 270°, working in three stages of 90° each.
11.4 Pressure transducer replacement
If the pressure transducer needs to be replaced proceed as follows:
1. Insulate the transmitter from the process by acting on the manifolds or on the insulation valves
2. Open the vent valves to allow sensor depressurization
3. Disconnect the power supply and disconnect the wiring to the transmitter
4. Disconnect the transmitter from its bracket by loosing on the fixing bolts.
5. You should now open the communication board housing compartment cover.
6. The communication board is connected to the sensor via a flat cable and a connector. Remove the communication board
by releasing the two fixing screws and gently disconnect the connector from the communication board.
7. The transmitter housing needs now to be disconnected from the pressure transducer. To accomplish such operation, it is
necessary to release the tang screw until you will be able to rotate easily the housing.
8. Continue to rotate the electronic housing counterclockwise until its complete removal.
9. Unscrew the fixing bolts from the transducer and remove the process flanges.
10. The orings placed between the diaphragm and the flange (Viton or PTFE) must be replaced after every disassembly.
11. Reassemble the flanges following the steps above in reverse order.
12. The 266 can reconfigure itself with the previous configured parameters thanks to the auto-configuration functionality.
13. Before powering on the transmitter raise dip-switches 1 and 2 in up position. Connect the transmitter to power supply,
wait ten seconds and lower dip-switched 1 and 2 .
14. A PV zero bias operation is recommended to align the zero to the installation. This operation should be accomplished
after the transmitter has been installed back to its bracket and connected to the manifold. See “Correcting the lower
range value / zero shift”.