Honeywell MPD Series Operating Manual page 10

131 Collecting Cone
(02000-A-1642)
The detection of a lighter than air gas is enhanced by the use of a Collecting Cone.
The cone fits onto the Sensor accessory thread in place of the Filter Housing and
retains the filter. The appropriate filter must be fitted.
A nozzle on the cone permits gassing of the Sensor with the cone in position. Test
gas is applied either direct to the nozzle or via a permanently connected pipe-line
when the Sensor is in an inaccessible location.
Figure 2. Collecting Cone
132 Weatherproof Cap/Housing
(Cap: 02000-A-1640, Housing: SPXCDWP)
The Weather Protection Housing, fitted to a sensor installed in an exposed location,
affords protection from driving rain from vertical to 30° below horizontal. When
mounted close to the ground, protection is afforded from heavy rain rebounding
off the ground. It also reduces contamination from industrial waste and enables
the application of test gas in high wind speeds without significant error.
Incorporated in the housing is a nozzle to facilitate gassing of the sensor with the
Weather Protection Housing in position, either by direct application to the nozzle or
via a permanently connected pipeline. On the Weatherproof Cap (02000-A-1640),
the nozzle is free to rotate within the housing to allow removal from the sensor
without disconnecting a permanently connected pipeline, when changing the
Hydrophobic Barrier and cleaning the sensor.
Weatherproof Cap
MPD
Sensor Accessory Thread
Figure 3. MPD, Adaptor and Weatherproof Cap
Figure 4. Weatherproof Housing
10 MPD Operating Manual