Product manual

Installation
3-18
Part 1105120-01
E 2013 Nordson Corporation
Monitoring Lamphead Air Pressure
See Figures 3-13 and 3-14. The lamphead pressure sensor on the light
detector board is connected by a hose to atmosphere at the top/front or
bottom pressure port. (See Figures 3-9 and Figure 3-10 for the location of
the pressure ports on internal and external blower versions.) The hose
must be connected to Port B on the board, as shown.
It is important that the pressure port not be blocked, and that the
appropriate port be used depending on the cooling air and exhaust air
arrangements.
Top Pressure Port
(Factory default.) If the exhaust air from the lamphead is not restricted in
any way the top pressure port should be used. Examples of this type of
installation are when lamps are mounted in a large enclosure. Caution
should be used when using the top pressure port as any restriction of the
exhaust air will influence the pressure sensor readings and possibly
damage the lamphead.
Bottom Pressure Port
In applications where there is a restriction preventing the free flow of
exhaust air from the lamphead, the bottom pressure port must be used.
Examples of this type of application are quartz light shields, AirShield
ventilation systems, dedicated exhaust ducts, or any other type of exhaust
box or lamp face attachment that can restrict the exhaust air flow.
When using the bottom pressure port the lamphead mounting structure
must be designed so that this port is open to the air exiting through the
screen. Do not simply set the lamp in a bracket or on a ledge that could
cover over the bottom pressure port.
Switching Pressure Ports
External blower lampheads are shipped with the pressure transducer
connected to the top port. Internal blower lampheads are shipped with the
transducer connected to the front port.
Use this procedure to switch the hose connection from the top or front port
to the bottom:
1. See Figures 3-13 and 3-14. Remove the lamphead cover.
2. Disconnect the pressure hose and unscrew the barbed fitting from the
top or front pressure port.
3. Install the barbed fitting in the bottom pressure port, then feed the hose
through the lamphead and connect it to the barbed fitting.