Honeywell 705 Operating Instructions Manual page 8

MAN0364.P65 Issue 03, Mar 01
00705M5003
A nozzle on the cone permits gassing of the sensor with the
cone in position. The test gas is applied either direct to the
nozzle or via a permanently connected pipeline when the
sensor is fitted in an inaccessible location.
1.3.3 Weather Protection Housing
The Weather Protection Housing, fitted to a sensor installed
in an exposed location, affords protection from driving rain
from the vertical to 30° below the 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 a test
gas in high wind speeds without significant error.
The housing is fitted to the sensor accessory thread in place
of the Filter Housing and retains the Hydrophobic Barrier.
Incorporated in the housing is a nozzle to facilitate gassing
the sensor with the Weather Protection Housing in position,
either by direct application to the nozzle or via a permanently
connected pipeline. 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.
1. INTRODUCTION
Nozzle
6.35 O/D
Figure 2 Collecting Cone
42mm
165mm
9
705 Sensor CO
77.6mm