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2600T SERIES | PRESSURE TRANSMITTERS | OI/266/FF-EN REV. E
• Respect the below table indications for reinstalling the process flanges:
Transmitter model and range Procedure
266DSH / PSH / VSH Viton Gaskets All bolting
PTFE Gaskets Carbon Steel NACE and
Stainless Steel
Stainless Steel NACE
266DSH.x.H
(High static option)
Viton Gaskets All bolting
PTFE Gaskets All bolting
266DSH range A
(1KPa)
All gaskets All bolting Use a torque wrench to tighten the process flange screws/nuts to a torque of
reassembly the original performances can not be guarantee anymore.
266DSH / 266PSH
with Kynar inserts
All gaskets All bolting
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.
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”.
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