Location/Mounting On Burner - Honeywell U2-S User Manual

U2-S MODEL COMBINATION VIEWING HEAD AND SIGNAL PROCESSOR
WARNING WARNING
WARNING
Over-tightening the connector can damage the
connector or housing.
Damage will void warranty and hazardous location
approvals. Do not exceed 180 degrees of further
rotation after hand tightening!
WARNING WARNING
WARNING
EXPLOSION HAZARD
DO NOT DISCONNECT WHILE CIRCUIT IS LIVE
UNLESS AREA IS KNOWN TO BE
NONHAZARDOUS.
Substitution of components may impair suitability
for class i, division 2.
The U2-S model viewing port is designed for interface to a
1" NPT (M) fitting. The viewing head can be mounted in
any orientation, any angle, upward or downwards.
It is recommended that earth ground is applied at the
labeled earth ground screw connection on the housing. It
is recommended the drain wire be connected to earth at
power supply.
To reduce noise interference from ignition transformer or
other high voltage sources, make sure all high voltage
cables are in good condition and are at least 300 mm (12")
away from U2 wiring.
32-00015—05
1 (25) NPT 1(25)
CONNECTION
2-29/32 (73)
Fig. 1. Dimensional drawings.
BURNER FRONT PLATE
OR WINDOWBOX
R-518-CL12-PG
PURGE AIR COUPLER
1 (25)
AND R-518-PT12
NPTF PIPE
INSULATING LOCKING
COUPLER ADAPTER
FLANGE
(OPTIONAL)
Fig. 2. Typical mounting example.
4

Location/Mounting on Burner

Honeywell can provide mounting accessories such as a
swivel mount, heat/electrical insulator, quick mechanical
disconnect, high pressure isolation unit, etc. Check with
your sales representative for your application.
1. Ensure location provides clear view of the flame
under all operating conditions.
2. If the burner is provided with a pipe mount, use a bell
type reducer to 1" NPT (M).
3. When using purge/cooling air, make sure hoses are
electrically isolated from the Earth to prevent multi-
ple ground loops.
4. Depending upon the application, purge/cooling air
pressure and flow will be different. As it is easier to
measure pressure than flow, ensure that the
entrance to air connection is a minimum of 25 mm
WC (1" wc) above back pressure at all the time, from
minimum to maximum load.
5. IMPORTANT!
FLAME DISCRIMINATION
In multi-burner applications, it is important to sight
for high frequency, high radiation intensity zone of
the target flame, while sighting the low frequency,
low radiation intensity zone of the background flame
see Fig. 3 for IR, or Fig. 4 for UV for an example. This
allows for filter, gain, and threshold settings to prop-
erly discriminate or recognize the target flame while
rejecting background flame.
6. Where practical, use a swivel mount to allow for
adjustments to optimize the flame viewing location.
5-3/32 (130)
4-19/32
(118)
3/4 (19) NPT
CONNECTION
M34431
M33628