6
5.0 Replacement of a Defective
Air Sentinel
In this application the instrument should look exactly the same after
replacement. It would be wise to take a few photos before disassembly.
Be sure to note problems and mark these on the defective unit. In most
instances you can contact HF scientific for an RMA number to return
the defective controller.
Tools Required:
11mm (or
7
⁄
16
") combination wrench and socket wrenches
Small flathead screwdriver 2.5 - 4mm (or
1
⁄
8
-
5
⁄
32
")
Steps:
1. Remove the chassis Assembly as shown in section 2.1.
2. Remove the Temperature Controller Finger Guard as described in
section 2.2.
3. Remove the existing air vent connection. See section 3.3
4. Remove the Mains and Power Out connections terminal blocks
using the flat blade screwdriver. It is not necessary to wires from the
terminal blocks unless these terminal blocks have been damaged.
See section 3.4
5. Remove the 10 Washer/Locknuts.
6. Remove the defective Air Sentinel.
7. Replace in the reverse order of steps 1-6. Ensure all hardware
is tight. Also make certain that the terminal blocks have been
tightened into place.
To remove the PCB and Chassis assembly, ensure that water
and all electrical connections to the instrument are removed.
WARNING
!
