Installing/Removing The External Pushbuttons; Installing/Removing The Lcd Display; Securing The Housing Cover In Flameproof Areas; Operation - ABB 266 HART Operating Instruction

266 Models - HART

Installing/Removing the external pushbuttons

– Loosen the screws that fix the nameplate plate and slide the
plate to gain access to the local adjustments.
– Loosen the pushbuttons assembly screws (1) holding down
the plastic element which is spring loaded.
– Remove the gasket (3) which is positioned below the
pushbutton plastic cover (2).
– The three pushbuttons (4) and the relevant springs (5) can
now be removed from their seat.

Installing/Removing the LCD display

– Unscrew the housing cover of the communication board/
LCD side.
Important
With an Ex d / Flameproof design, please refer to the section

"Securing the housing cover in flameproof areas".

– Attach the LCD display. Depending on the mounting position
of the pressure transmitter, the LCD display may be attached
in four different positions.
This enables ± 90° or ± 180° rotations.
Important
Retighten the housing cover until it is hand-tight.
If necessary, refer to the section "Securing the housing cover in
flameproof areas".
Securing the housing cover in flameproof areas
Each of the front faces of the electronics housing features a
locking screw (hex-head socket screw) on the bottom side.
– Install the housing cover to the housing by hand-tightening it.
– Turn the locking screw counterclockwise to secure the housing cover. This involves unscrewing the screw until the screw head
stops at the housing cover.

Operation

Local pushbuttons functionality

266 transmitters allow local adjustments via the on-board non
intrusive pushbuttons.
The pushbuttons are located under the identification nameplate.
To gain access to the local adjustments release the fixing
screws of the nameplate and rotate clockwise the identification
plate.
Warning - Potential damage to parts
Operating the control buttons with a magnetic screwdriver is not
permitted.
34 OI/266/HART-EN Rev. D | 2600T Series Pressure transmitters
Figure 40: External pushbutton assembly components
Figure 41: Windowed front cover and LCD display
1
2 4
3
Figure 42: Pushbutton functionalities
1 - Identification nameplate
2 - Zero pushbutton
3 - Span pushbutton
4 - Write-protection pushbutton