Honeywell Midas, User Manual

Page: 80 / 160

Midas
®
Gas Detector
8-7
filter ensuring that the filter connectors are
fully engaged in the manifold ports and that
the filter is the correct orientation (arrow
pointing downwards). Orient the metal
retaining clamps away from the pump wiring
to prevent damage.
9. Route pump wiring away from the chassis and
manifold to prevent damage.
Diagram 8-7. Filter orientation.
Filter connector
Manifold ports
New filter
correct orientation
➭
8.5 System Leak Check Procedure
Caution
When performing a leak check, the Midas
®
must be placed in inhibit mode to prevent
false concentrations or faults to be activated
when plugging the Sample and/or Exhaust
Lines.
Example: O
2
(oxygen) – plugging of the ports
causes the O
2
levels within the Midas
®
flow
path to be depleted as the sample becomes
stagnant. The result is the concentration levels
begin to fall and trigger the alarms for the O
2
depletion.
1. Place the Midas
®
into Inhibit (see Section
7.4.3 )
2. Plug the Inlet Sample line (see Diagram 8-8)
3. The flow meter indicators will begin to drop
and ultimately disappear (within seconds) (see
Diagram 2-3 )
4. Continue to keep the port plugged until
the Midas
®
reports an “F81” (Flow Fail) –
approximate time to fault is 1 minute
5. Remove the plug
6. Allow 15 seconds or so to allow the Midas
®
flow to stabilize then clear the fault by
pressing and holding ‘X’
7. Plug the Outlet Exhaust line
8. The flow meter indicators will begin to drop
and ultimately disappear (within seconds)
9. Continue to keep the port plugged until