ABB 266 HART Series, Operating Instruction

Page: 65 / 76

2600T Series Pressure transmitters | OI/266/HART-EN Rev. M 65
10 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
MWP ≤ 41Mpa /
410bar / 5945 psi
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.
266MSx / 266RSx
MWP 60Mpa /
600bar / 8700 psi
Perbunan 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.
10.4 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.
4. Disconnect the transmitter from the bracket unscrewing the
fixing bolts.
5. Open the communication board compartment cover.
6. The communication board is connected to the sensor via a
flat cable and a connector. Remove the communication
board and gently disconnect the connector.
7. Release the tang screw until nd rotate the housing until its
complete removal.
8. Unscrew the fixing bolts from the transducer and remove
the process flanges.
9. The orings placed between the diaphragm and the flange
(Viton or PTFE) must be replaced after every disassembly.
10. Reassemble the flanges following the steps above in reverse
order.
11. The 266 can reconfigure itself with the previous configured
parameters thanks to the auto-configuration functionality.
12. 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.
13. After installing the transmitter on the bracket and connecting
it to the manifold, perform a PV zero bias.
10.5 Electronic replacement
If the electronic module 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.
4. Open the communication board compartment cover and
remove the LCD display (if installed).
5. Remove the communication board and gently disconnect
the connector.
6. Connect the sensor flat cable to the new electronic module
with dip switch 1 in up position.
7. Connect the transmitter to power supply, wait ten seconds
and lower dip-switch 1 to 0 position. 266 can reconfigure
itself with the previous configured parameters thanks to the
auto-configuration functionality.
10.6 Electronic upgrade from Standard to Advanced
HART
Attention. In case of electronic upgrade from Standard to
Advanced HART it is necessary to perform a full transmitter
reconfiguration since all customized data will be lost.
To upgrade the electronic module, proceed as follows:
1. Follow all points listed in the previous paragraph from 1 to 5.
2. Connect the larger flat to the new electronic which have to
feature dip-switches 1 and 2 in up position.
3. Connect the transmitter to power supply, wait ten
seconds and lower dip-switched 1 and 2.