Changing The Transmitter Unit Front Panel Assembly - Honeywell Apex Technical Handbook

MAN0604_Issue 09_02-2013
2110M8030

5.2.4 Changing the Transmitter Unit Front Panel Assembly

This assembly may need to be replaced if the screen becomes damaged or the display and buttons
do not operate correctly. One of the following two types of Front Panel Assembly may be fitted
depending on the Transmitter Unit version:
• CSA Transmitter Unit Front Panel Assembly
• All other versions
The assembly is attached to the top of the Transmitter Unit by two screws.
Apex top
Retaining screws
To replace the assembly carry out the following procedure.
(1) Isolate all associated power supplies and ensure that they remain OFF during this procedure.
Ensure a gas free atmosphere.
(2) Unscrew the two Front Panel Assembly retaining screws.
Use a hex-key tool to loosen the captive M4 screws.
(3) Pull the Front Panel Assembly forward away from the top.
Temporarily refit the M4 hex-key tool to one of the retaining screws and gently lever the
assembly out of the recess in the top.
(4) Discard the removed Front Panel Assembly.
(5) Place the replacement assembly into the recess in the top of the Transmitter Unit.
(6) Secure the two retaining screws.
Tighten to 2.0Nm.
(7) Switch on all associated power supplies.
(8) Check that the system is working correctly.
Ensure that the LCD screen is displaying a valid Gas Reading (see Chapter 4). Carry out
a short random check of the menu system to ensure the front panel buttons are working
correctly and the Transmitter Unit is responding and the LCD Screen is showing the correct
information.
(9) Return the system to normal operation.
See Chapter 4.
5. MAINTENANCE
Front Panel
Assembly
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98
2110B2825
2110B2820
o k
Apex