PO2 handset displays two oxygen sensors on one digital panel meter
by cycling between the two sensors one at a time. The board is
enclosed in an ambient pressure housing, the housing has a screw
(left bottom) that is used to turn the power on/off and activate the
backlight by screwing it in and out. There is an access port to the
sensor calibration trim pots on the end of the housing.
There are two
different display boards, a left and a right side. Power is
from a standard 9 Volt battery located behind the display board. The
battery and oxygen sensor wires are connected to the green header
The Gorilla II
board is the latest incarnation of the Gorilla PO2 display board
series and incorporates many improvements over the Gorilla I
version. Utilizing surface mount technology and a Microchip
microcontroller all analog signals are processed through an onboard
analog to digital converter (ADC) to allow greater user
control and options.
Here we see the
board at power up with all the LEDís and backlight on which allows
the user to ensure they're all operational, this also puts the
maximum current draw on the battery. While the battery is supplying
the maximum current load the microcontroller reads the battery
voltage and displays the reading on the digital panel meter. The
next software revision will also sequence through and display
each sensors millivolt value.
display of one, two, or three sensors can be specified by the user.
All display board operating parameters, such as the number of
sensors to displayed, is accomplished using a single push button.
This push button also controls power to the board and activation or
deactivation of the backlight.
onboard Heads Up Display that has a high, low, and okay LED. These
signals are also routed to the header connector so that they can be
attached to a HUD on the divers DSV. The high and low alarm levels
are user definable
Included in the
alarms is a low battery alarm LED.
Back of Board
All sensor signals
are routed through an op-amp and read by the microcontroller for
digital signal processing.
The housing is
double o-ring sealed and is easily disassembled for service. The sensor and DSV HUD wires are
routed through a LP second stage hose which, with a standard second
stage regulator swivel, allows the housing to be rotated during use
for optimal viewing.
The sensor wiring
harness is inexpensive and easy to replace.
Here we see the
sensor wires coming out of the hose and into the housing.
The wires run
through the hose and into the rebreather head.
This concludes our presentation of the
Gorilla Diving Products
HEAT PO2 Displays.
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