Clean fresh air bores
Clean infrared (IR-) filter
Exchange air filters in the measuring head
Exchange air filter in pressure regulator unit
Exchange measuring head
To mount the new measuring head execute the 3 steps in reverse order.
Exchange bellows and suspension-system
Step 1 is to dismount the measuring head.
To finish the assembly execute the first 2 steps in reverse order.
Measuring head fuses
The device has two internal fuses. The first is located in the main connector of the measuring head. This is a 'self-repairing' fuse which protects the filter circuit in the connector.
To reset this fuse, unplug the main connector and wait 5 minutes before you plug it again.
If all LED's remain off exchange the 2A semi lag fuse II at the rear side of the measuring head (see Figure 55).
Check for earth fault problem
In case all LED's remain off despite fuses are ok, perform check as shown in Figure 56. Often it happens during welding work around the engine or in engine room that electrical current of high energy passes through detector and its electrical wiring.
As a result, possible bursts and peaks may cause damage inside the measuring head. In that case, only a replacement of the measuring head helps.