Design Analysis H-522 - Earth Ground Lug; Pressure Reference Port (Vent); Pressure Port (Input)

2-2 Hardware Options and Installation XL™ Series
Figure 4-1B Models H-522/H-522+ Front Panel Description
2.2.1 Earth Ground Lug
Run a heavy gauge (14awg) wire from the GND lug of the XL™ to the Earth ground of the
instrument shelter. If there is no Earth ground, one must be installed. This is most important in
the protection of your electronic equipment. It insures the equipment will function properly.
(PROPER GROUNDING IS A MUST!)
2.2.2 Pressure Reference Port (Vent) (H-350XL™ Model only)
In order to make accurate readings, the H-350XL unit must have a way to measure the
atmospheric pressure. This port provides that function. The user never has to make connections
to, or service this port.
Note: Model H-500XL™ and H-510XL™ only uses this location to secure the wiring panel to
the main box using a large hex bolt.
2.2.3 Pressure Port (Input) (H-350XL™ Model only)
This is the pressurized line input port. The user will connect this line to the H-355 bubbler
system or to the conoflow system. Make sure the pressure on this line does not exceed the limits
of the sensor. The pressure range is listed on the serial number label on the side of the H-350XL.
Note: Model H-500XL™ and H-510XL™ only uses this location to secure the wiring panel to
the main box using a large hex bolt.