heinrichs weikamp OSTC cR User manual

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User manual
Sensor monitoring with the
OSTC cR

The OSTC cR was specially developed for
rebreather divers who also want to use
their dive computer for O2 monitoring. The
robust S8 connector allows to readout and
monitor up to three oxygen sensors. Alter-
natively the calculation can be done with
auto setpoints or xed setpoints.
The OSTC cR runs with the rmware hwOS
tech that offers various settings for div-
ing with a rebreather. For example, the re-
quired bailout can be calculated and its
range monitored in real time.
This supplementary manual only refers to
the sensor operation of the OSTC cR. For a
complete description of the functions and
settings of your dive computer, please refer
to the manual OSTC dive computer with the
rmware hwOS tech.
The development of the dive computers of
heinrichs weikamp is permanently going
on. Use the rmware updates to keep your
OSTC cR always up to date. Get it for free at:
www.heinrichsweikamp.com
We hope you enjoy diving with your new
OSTC cR dive computer!
Your OSTC cR
For any questions relating to your OSTC cR please contact us:
• Internet forum: www.forum.heinrichsweikamp.com
• E-mail: [e-mail]
• Post: heinrichs weikamp
Adlerstraße 7
79098 Freiburg im Breisgau
Deutschland
Contact

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1. S8 connector
With the S8 connector you can connect di-
rectly up to three oxygen sensors to your
OSTC cR. Optionally you can use a digital
connection via the hw HUD S8.
The S8 connector is triple O-ring sealed.
This construction is very robust. The OSTC
cR can be connected to standard oxygen
sensors with a common ground.
Before attaching the sensors the rst time,
pay attention to the correct conguration
of the pins. The S8 connector has the fol-
lowing pin conguration:
•PinG:ground,sensor1,2and3
•Pin1:plus,sensor1
•Pin2:plus,sensor2
•Pin3:plus,sensor3
The maximum sensor voltage is 165mV per
sensor.
The minimum voltage for calibration is
7mVinair(21%O2)and36mVinpureox-
ygen (100% O2).
The products of heinrichs weikamp use a
100 kOhms load resistor for analog O2 cell
inputs.
The remaining four pins are designated for
the USB connection. Only use the included
original cable! Via USB you can recharge the
OSTC cR and connect it to a PC or notebook
to read logbook data and install updates.
Caution
A dive with an open S8 connector can irre-
parably damage the OSTC cR. If no S8 cable
is connected, always close the socket with
the cap.
Signal Color of S8 cable Pin number S8 socket
Sensor 1 + black 1
Sensor 2 + brown 2
Sensor 3 + white 3
GND/Common blue G
3
21G

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Connect the sensors to the OSTC cR via the
S8 cable. First plug the connection together
and then screw down the plug. Do not use
force.
Mode
To use the sensor operation in the OSTC cR
rst go to »Dive Mode« and select the dive
mode CCR or pSCR. Then go to the CCR/
pSCR Setup, go to »Mode« and select »Sen-
sor« with the right ENTER button.
Calibration
Open the menu »Calibration« to calibrate
the ppO2 values of your oxygen sensors. For
each sensor, the voltage is displayed in mil-
livolts (mV). With »Cal. Gas O2« you can set
the oxygen content of the gas that you use
for calibration.
Setting range: 21 –25 %, 95 –100 % (CCR)
21 – 100 % (pSCR)
Default: 21 %
Flush your system with the gas until the mV
displays of the sensors do not change any
more. Conrm with »Calibrate«. Check in
surface mode whether the displayed ppO2
value is plausible.
The calibration takes the current surface
pressure into account.
3. Sensors in use
Surface mode
The measured values of the sensors are per-
manently displayed on the start screen in
surface mode. A red down arrow appears
next to the sensor value if the sensor deliv-
ers critically low mV values after calibration
according to the ppO2 value. In the Custom
View, also the voltage (in mV) for each sen-
sor is displayed.
2. Calibration of the sensors
Under »Mode« you can select either Fixed Setpoint,
Auto Setpoint or Sensor.
Menu »Calibration«. The calibration takes the cur-
rent surface pressure into account.

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Dive mode
In dive mode, the OTSC cR shows the calcu-
lated average value of the sensors, which is
used for the deco calculation, always on the
main screen. It is marked with an asterisk *.
The three individual sensor values can be
displayed in the Custom View (right ENTER
key).
If one sensor is not calibrated, – – – appears
on the display.
If a sensor value drops to zero (e.g. due to a
broken cable), it is marked yellow and is no
longer used for the calculation.
If a sensor value is colored red, it is outside
the set ppO2 limits.
If the sensor values differ too much, the
warning »Sensors <>« appears and the rel-
evant ppO2 value is displayed inverted. The
custom view with the three sensor values
is switched on. The value is highlighted in
white if the ppO2 is within the set mini-
mum and maximum values. It is highlight-
ed in red when the ppO2 is outside the lim-
its.
!Warning
Check the reason for the deviation. Flush
your breathing circuit with a known gas
and decide which sensor or sensors may de-
liver incorrect values.
In the menu you can deactivate or reacti-
vate each sensor individually and switch to
the calculation with setpoints.
A deactivated sensor appears in blue and is
no longer used for the calculation of the av-
erage value. No more warnings are gener-
ated for it.
You can set the minimum and maximum
values for the ppO2 under Deco Setup >
ppO2 Settings > Min Loop and > ppO2
max./ppO2 Deco.
The red arrow appears if the voltage of a sensor is
very low.
The average value of the sensors (in this case 0.98
bar*) is always shown on the display. It is used for
the deco calculation.

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In the event that all sensors fail or are man-
ually deactivated, a fallback occurs. The
dive computer switches to the calculation
with xed setpoints and immediately cal-
culates with the ppO2 from setpoint 1. A
fallback warning appears. Another setpoint
can be selected manually.
Note
Sensor operation can also be used in pSCR
mode. In this mode the xed setpoints be-
come calculated setpoints. Auto setpoint is
not selectable.
Menu in dive mode
In dive mode you can switch from sensor
operation to operation with setpoints. You
can activate or deactivate individual sen-
sors.
Open the menu and select »Setpoint«. A
submenu appears that shows the setpoints
and the menu item »Sensor«. Select »Sen-
sor«.
With »Use Sensor« you can switch from
xed setpoints to sensor mode. With »Sen-
sor1«,»Sensor2«and»Sensor3«youcan
activate or deactivate each sensor. Deacti-
vated sensors appear in blue.
If all sensors fail or are deactivated, there will be a
fallback to setpoint 1.
In the submenu »Sensor« you can activate or deac-
tivate each sensor.
Sensor warning: The values of all sensors deviate
too much from their common average value. The va-
lueofsensor3isalsooutsidethesetppO2warning
threshold.
Under »Setpoint« you can select setpoints or open
the submenu »Sensor«.

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heinrichs weikamp GmbH
Adlerstraße 7
79098 Freiburg im Breisgau
Deutschland