heinrichs weikamp OST2 User manual

Open Source Dive Computer
Owner’s Manual

Die Produkte der heinrichs weikamp GbR entsprechen den An-
forderungen der Richtlinie des EU-Rates 89/336/EEC (EMV)
und 2004/108/EC (EMV), ggf. ergänzt in der Angleichung
der Rechtsvorschriften der Mitgliedstaaten in Bezug auf die
elektromagnetische Verträglichkeit.
CE Declaration of conformity
Products by heinrichs weikamp comply with the requirements
of the Council Directives 89/336/EEC (EMV) and 2004/108/
EC (EMV), as amended where applicable on the approxima-
tion of the laws of the member states relating to Electromag-
netic Compatibility.
heinrichs weikamp GbR, 79098 Freiburg
Freiburg, 2010
Christian Weikamp Matthias Heinrichs
DCE Konformitätserklärung
GB
RoHS Konformitätserklärung
Die heinrichs weikamp GbR erklärt hiermit, dass alle von uns ab
Januar 2006 hergestellten Produkte RoHS-konform sind gemäss
EU Richtlinie 2002/95/EG bezüglich folgender Substanzen:
Blei (Pb)
Cadmium(Cd)
sechswertiges Chrom(Cr(VI))
Quecksilber(Hg)
Polybromierte Biphenyle (PBB)
Polybromierte Diphenylether (PBDE)
Declaration of RoHS Compliance
heinrichs weikamp GbR herewith declares that as of January
2006, all our products are manufactured RoHS conformal, fully
complying with EU Directive 2002/95/EC with respect to the
following substances:
Lead (Pb)
Cadmium(Cd)
Hexalvalent Chromium(Cr(VI))
Mercury(Hg)
Polybrominated biphenyls (PBB)
Polybrominated diphenylethers (PBDE)
heinrichs weikamp GbR, 79098 Freiburg
Freiburg, 2010
Christian Weikamp Matthias Heinrichs
D
GB

Your OSTC2
3
Thank you for choosing a heinrichs
weikamp dive computer.
Using open source software for full
transparency, combined with state-of-
the-art hardware and robust design,
OSTC2 is your instrument of choice for
technical diving.
We hope you enjoy diving with your
new OSTC2 dive computer.
To become familiar with the functions
of OSTC2 and to use it correctly, it is rec-
ommended that you read this manual
carefully.
Functions Overview
The Open Source Dive Computer OSTC2
assists you with the following func-
tions:
Display
• Diving depth and duration according
to EN13119
• Maximum diving depth
• Ambient temperature
• Ambient pressure
• Bottom time
• Duration and depth of planned
decostops
• Time to desaturation based on diving
depth and duration
Planning
• Set and retrieve gas mixtures match-
ing the scuba set
• Calculate a decoplan in the simulator
Record
• Time, duration, depth prole, tem-
perature, reference pressure and time
to desaturation
Contacting us
If you have any questions regarding the
OSTC2, you can reach us
• on the Internet forum
www.heinrichsweikamp.com
• via e-mail:
[e-mail]
Postal Address
heinrichsweikamp
Adlerstraße 7
79098 Freiburg im Breisgau
Germany
Your OSTC2

Contents
4
Your OSTC2.................................................... 3
Functions Overview.............................. 3
Contacting us ......................................... 3
Contents......................................................... 4
Device Overview ......................................... 6
Left/Front/Top View ............................. 6
Bottom View ........................................... 7
General Notes.............................................. 8
Technical Status..................................... 8
User Settings........................................... 8
About this Manual................................ 8
Warnings and Safety Advice................... 9
Precautions.............................................. 9
Before Every Dive................................... 9
While Diving .........................................10
Safe Use of OSTC2 ..............................11
Environmental Conditions...............11
Basics ............................................................12
Preparations for rst use ..................12
Control Elements and Menus .........12
Charging the Battery..........................13
OSTC2 Modes of Operation..............14
Display in Surface Mode.........................17
Surface screen ......................................17
Desaturation diagram .......................18
Gaslist .....................................................18
Setpoints................................................18
Surface Interval....................................19
Menu Functions in Surface Mode.......20
Logbook – Recorded Dive Data............21
Gas Setup – Adapting Scuba Gas
Mixes.............................................................22
Reset Menu.................................................24
Setup – Adjusting Base Settings .........25
Conguring Custom Functions ......25
Salinity ....................................................26
Decotype – OSTC2DiveSetting......27
Date Format ..........................................27
Debug......................................................27
Show License ........................................27
Set Time and Date ....................................28
Set Time .................................................28
Contents

Contents
5
CCR SetPoint Menu – Closed Circuit
Rebreather Settings.................................29
Battery Information.................................30
Simulator.....................................................31
Calculate Decoplan ..................................31
Simulating Dive Mode ............................32
Display in Dive Mode...............................33
Main display in dive mode/Closed
Circuit......................................................33
Main display in dive mode/Open
Circuit......................................................34
Main display in dive mode/
Gauge, Apnoe.......................................35
Menu Functions in Dive Mode.............36
Set Gas ...................................................36
SetPoint ..................................................37
Bailout.....................................................37
Display ....................................................37
Gas List....................................................37
ResetAvr..................................................38
ToogleGF.................................................38
CustomViews in DiveMode...................38
Stopwatch..............................................39
Marker.....................................................39
Time .........................................................39
Lead Tiss..................................................39
Avr.Depth ...............................................39
Average depth since the start of
the dive...................................................39
Graph.......................................................39
EAD / END..............................................39
FutureTTS...............................................39
Cleaning and Care ....................................40
USB Interface .............................................41
Installing the Driver............................41
Transferring data and settings .......41
Updating the rmware .....................41
Technical Specications..........................42

Device Overview
6
Left/Front/Top View
1 Display
2 SET/MENU button (contact switch))
3 ENTER button (contact switch )
4 Bungee mount
Device Overview
2
3
4
1

Device Overview
7
Bottom View
7 Pressure sensor
8 USB connector with protective cap
9 LED-Statusdisplay
8
9
7

General Notes
8
Technical Status
This manual corresponds to the techni-
cal status of OSTC2 and its rmware as
of May, 2013.
OSTC2, its rmware and the documen-
tation are subject to technical changes
without notice.
OSTC2 rmware (integrated software)
is being continually enhanced. To make
the best use of OSTC2, we advise you to
use the latest stable rmware available
on the heinrichs weikamp website:
http://www.heinrichsweikamp.com/
ostc2
When updating the rmware, please
refer to section USB Interface: Updating
the Firmware.
User Settings
Unless noted differently, the informa-
tion in this manual refers to OSTC2
standard settings.
Values, formats, units and display set-
tings which can be adjusted by the user
are marked with an asterisk * in this
manual.
About this Manual
Special Markings
WARNING:indicates a situation that
carries a signicant risk of injury.
CAUTION: Indicates a situation that car-
ries a risk of damage to the device.
Terms of Use
Copyright © heinrichs weikamp.
Copying or reusing this manual, or parts
of this manual, is not allowed without
the written permission of heinrichs
weikamp GbR.
General Notes

Warnings and Safety Advice
9
!WARNING
For your own safety, follow the safety
advice given below.
Precautions
The most important factor in diving
safely is a competent and well trained
diver, diving within their abilities.
This dive computer is intended for ex-
perienced divers. That implies:
• Sufficient knowledge about the laws
of physics in diving is required.
• Relying on a wrongly congured dive
computer might damage your health.
• Do not use this dive computer if you
are not familiar with or don’t un-
derstand the settings and displayed
information of OSTC2.
• If necessary, you must be able to n-
ish your dive safely without the aid
of a dive computer.
• It is mandatory to hold a decompres-
sion scuba dive qualication for use
of OSTC2 diving computers.
Before Every Dive
Plan your dive.
Set up a dive plan independently from
OSTC2, and take it with you when div-
ing.
Make sure that your OSTC2 is ready for
use and correctly congured.
Always conrm the following questions
before diving:
Stable Firmware? Use only rmware
provided by heinrichs weikamp which
is marked as “stable”. It has been tested
and allows for a reliable performance of
OSTC2.
Congured Correctly? Check the set-
tings of your OSTC2. If necessary, adjust
the settings according to your dive plan
and equipment.
Battery charged? Check the battery
status using the battery charge indi-
cator on the display. To ensure reliable
performance throughout your dive, the
battery must be charged sufficiently.
With the display at full brightness, a
fully charged battery lasts more than
40hours in dive mode. In the course of
its lifecycle, battery life may decrease.
Device waterproof? Ensure that the
USB connector cap is properly closed
and watertight. Check the housing for
cracks or damages which might allow
water to intrude.
Warnings and Safety Advice

Warnings and Safety Advice
10
Functioning pressure sensor? Ensure
that the opening of the pressure sensor
is neither clogged nor soiled
Safely attached? Make sure OSTC2
can be fastened safely using either the
bungee cord or a suitable alternative.
Display messages? Check the display
of OSTC2 for warnings or other signals.
Do not dive if the OSTC displays a warn-
ing, e.g. the warning symbol. Check the
cause for the warning.
While Diving
Take a backup system with you.
While diving, always carry a backup
system to measure duration and diving
depth independently from OSTC2
Take OSTC2 with you on every repeat
dive – don’t lend it to anyone.
A correct calculation of tissue satura-
tion requires that OSTC2
• is congured correctly
• is used on every dive
• is only used to record data during
your own dives (and not shared with
other divers)
Take a sufficiently long surface break
before diving again.
OSTC2 does not explicitly indicate how
long to wait before the next dive. Please
adhere to the guidelines you were
taught during your diver’s training.
CAUTION Saturation data is lost when
updating the OSTC2 rmware or in the
unlikely event of a failure. In these cas-
es, do not dive any further until tissue
saturation has returned to normal.

Warnings and Safety Advice
11
Safe Use of OSTC2
Do not modify the hardware.
Modications to the hardware of OSTC2
can negatively impact its reliability and
the leak tightness of its housing.
Only the cap of the USB connector can
be removed. There is no other way to
open the housing without damaging
the device.
It is imperative that the o-rings on the
USB cap are kept clean and free of hair,
grit, dirt, lint etc.
Keep your OSTC2 out of children’s reach
Small parts such as the USB connector
cap may represent a choking hazard and
conguration may be indadvertedly al-
tered without the divers knowledge.
Environmental Conditions
Store the OSTC2 in a cool, dry place.
Permissible temperature range for use
and storage: 0°C to 40 °C
Maximum water depth: 120m
CAUTION
• Surpassing the maximum water
depth may cause malfunctioning or
permanent damage of the device.
• The ZH-L16 calculation model is valid
only up to a depth of 120m.

Basics
12
Preparations for rst use
You receive your new OSTC2 ready-
for-use from heinrichs weikamp. If the
OSTC2 has not been used for a pro-
longed period of time, it may be neces-
sary to recharge the battery rst.
Before diving, you need to adjust some
settings as described in this manual.
Familiarize yourself with the OSTC2. It is
recommended that you read this manu-
al carefully and entirely.
Control Elements and Menus
Buttons Operate the OSTC2 using the
two red buttons SET/MENU and ENTER
on the left and right side, respectively.
The buttons are contact switches which
respond to short nger pressure. You
don’t need to hold the buttons down.
Menus The basic principles of opera-
tion that are described below apply to
most functions of the OSTC2. If nec-
essary, the documentation indicates
when to use these buttons differently.
To display the menu, press SET/MENU.
The display shows the pre-menu Menu?.
Press ENTER to conrm.
To select a menu entry, press SET/MENU
repeatedly until the cursor marks the
required menu item. From the item on
the bottom, the cursor jumps back to
the top.
In some menus, you will nd a More en-
try. Select this entry to access the next
menu page with more menu items.
To change the setting of a menu item,
press ENTER repeatedly until the re-
quired value is displayed. Note that for
some numerical settings, you have to
adjust the direction and increment of
change separately.
NOTE The pre-menu Menu? avoids
that the menu is displayed by mistake.
Conrm the pre-menu by pressing
ENTER within 5 seconds, otherwise the
OSTC2 will return to the normal display.
.
Basics

Basics
13
Charging the Battery
The battery of the OSTC2 is charged us-
ing the USB connector. The delivery in-
cludes a USB cable.
Your OSTC2 must be charged in a dry
environment to avoid damages caused
by corrosion or a short circuit..
1. Unscrew and remove the protective
lid from the USB connector.
2. Connect the USB connector to a
computer or a standard USB char-
ger.
3. The OSTC2 is being charged while
the connected computer or USB
charger is in operation.
4. While the battery is being charged,
the battery symbol is yellow.
When the battery symbol is green,
charging is complete (i.e. the battery is
charged at least 95%).
Once charging is completed, disconnect
the USB cable and screw the lid on the
USB connector to make it watertight.
The USB plug of the cable can be used
as ‘screwdriver’ for the cap.
If you do not use the OSTC2 for an ex-
tended period of time, you can leave it
connected to the USB charger until next
use.
Charging an empty battery might take
up to eight hours.
NOTE The OSTC2 comes with an in-
tegrated magnetic reset switch. When
charging, do not place the OSTC2 near
a magnet that might trigger the mag-
netic switch.

Basics
14
OSTC2 Modes of Operation
OSTC2 has three modes of operation
and switches automatically between
them:
Surface Mode
To wake up the OSTC2, press SET/MENU
or ENTER.
When in surface mode, the display
shows general information – current
time, date, temperature, ambient pres-
sure and battery charging status. After
a dive, the display also shows tissue
saturation and remaining time in the
no-y period.
In surface mode, you can adjust the set-
tings in preparation for the next dive,
read recorded dive data and adjust the
base settings of the OSTC2.
Dive Mode
The OSTC2 automatically switches into
dive mode when it is at least 1.6m* be-
low the surface for ve seconds.
In dive mode, the display shows current
diving depth, elapsed time since start-
ing the dive, maximum depth since
starting the dive, the currently selected
breathing gas and decompression in-
formation including Future TTS if con-
gured.*
Pressing ENTER toggles additional in-
formation provided as Custom View
like EAD/END, Average Depth, Time or
Stopwatch.
NOTE It is not possible to switch un-
derwater from dive mode to surface
mode; hence you cannot change the
base settings while diving. Note that
exceptions apply to the Apnoe setting.
TIP The integrated simulator allows
you to get acquainted with the func-
tions of the dive mode.
Sleep Mode
When the OSTC2 is not operated at the
surface, it switches into sleep mode af-
ter 2 minutes* to save battery.
In sleep mode, the display is turned off.
Ambient pressure is measured at regu-
lar intervals. After a dive, decompression
calculation continues in sleep mode.

Basics
15
OSTC2 Dive Settings
You can congure the OSTC2 to match
your equipment and how you intend
to use it. Furthermore, you can select a
model for decompression calculation.
To select a dive setting, select Setup >
Decotype, then choose one of the dive
settings described below.
NOTE The displayed information is
adapted according to the chosen dive
setting. In dive mode, menu items are
adapted as well.
Dive settings
withdecompressioncalculation
ZH-L16 OC, L16-GF OC Use these dive
settings with regular (open circuit) dive
equipment.
The decompression calculation model is
Bühlmann ZH-L16 for open circuit with
or without gradient factors.
ZH-L16 CC, L16-GF CC Use these
dive settings with a closed circuit
rebreather.
The decompression calculation model
is Bühlmann ZH-L16 for closed circuit
with or without gradient factors.
pSCR-GF With pSCR O2 Drop and lung
ratio modify the calculation of ppO2.
The basic values can be congured in
CF61, CF62 and CF63.
Dive settings
withoutdecompressioncalculation
Gauge Use this dive setting if you do
not use the OSTC2 for decompression
calculation.
With this dive setting, OSTC2 serves as
a depth gauge. Additionally displayed
and recorded are ambient temperature
and elapsed time since starting the
dive. Decompression and saturation
calculation are switched off.
Apnoe Use this setting for apnea div-
ing or snorkeling.
With this dive setting, the OSTC2 serves
as a depth gauge. Additionally displayed
and recorded are ambient temperature
and elapsed time since starting the
dive. Decompression and saturation
calculation are switched off. Dive time
is displayed in minutes*.

Basics
16
With the Apnoe setting, the OSTC2 re-
mains in dive mode even when diving
at low depths. You can switch into sur-
face mode at any time by pressing SET/
MENU?. Press ENTER to conrm the
Quit? alert.
Above a dened depth* and after a de-
ned delay*, the OSTC2 switches auto-
matically into surface mode.

Display in Surface Mode
17
1 Dive setting: OC, CC, CF, pSCR,
Gauge or Apnea
2 Ambient pressure
3 Time
4 Date
5 Ambient temperature
6 Remaining no-y time
(hours:minutes).
7 Remaining desaturation time
(hours:minutes).
8 Battery charge indicator / battery
voltage*
9 Custom text (up to 23 characters)
10 Installed rmware version
11 CustomView: Desaturation dia-
gram, gas list (OC), setpoints (CC),
Surface Intervall, Desaturation in
%. Display toogled with right but-
ton.
12 First gas mix (OC) or oxygen partial
pressure at setpoint 1 (CC), depen-
ding on the dive setting.
13 Gas overview, additional active
gases
Display in Surface Mode
Surface screen
2
3
4
5
6
8
9
7
1
11
12
13
10

Display in Surface Mode
18
Desaturation diagram
When using a dive setting with decom-
pression calculation, a desaturation dia-
gram is available.
Press ENTER to switch between desatu-
ration diagram and gas list (OC) or set-
points (CC).
N2
80%
He
After a dive, you can see the approxi-
mate tissue saturation in the desatura-
tion diagram.
The lines in the upper section represent
nitrogen saturation, the lines in the
lower section helium saturation of the
16 types of tissue according the Bühl-
mann model.
The numeric value is the lead tissue sat-
uration percentage.
The rst scale division marks a satura-
tion of 80%. Each following division cor-
responds approximately to the decrease
over the half-life for the respective type
of tissue.
TIP The same desaturation diagram is
also available in the dive mode (More >
Graphs).
Gaslist
When using an open circuit dive set-
ting, the list of available gas mixes can
be shown on the display at position 11.
Press ENTER to switch between gas list
and desaturation diagram.
The rst gas mix used when starting
your dive is displayed at position 12.
Air means compressed air (21% oxygen,
no helium). For any other gas mix, the
respective percentages of oxygen and
helium fractions are displayed.
Gaslist contains the other four preset
gas mixes with their respective percent-
ages of oxygen and helium fractions.
If the sum of oxygen and helium frac-
tions is less than 21%, the gas list shows
ERR indicating an unusual gas mix.
Setpoints
When using a closed circuit dive set-
ting, the list of available setpoints can
be shown on the display at position 11.
Press ENTER to switch between set-
points list and desaturation diagram.
The setpoints list shows the oxygen
partial pressure for the three setpoints
(SP) and the oxygen and helium frac-

Display in Surface Mode
19
tions of the diluent. The rst setpoint is
permanently displayed at position 11.
Surface Interval
Time passed since last recorded dive.
BSat/BDes/Last
Last Decostop depth is shown
.* BSat (Bühlmann Saturation) as well
as BDes (Bühlmann Desaturation) are
shown. Those two parameters are rele-
vant conservatism parameters for non-
gradient factor dive setups.
Dive Setting Display
In surface mode, the dive setting
is displayed on top of the left side.

Menu Functions in Surface Mode
20
You can adjust the settings to prepare
the next dive, read recorded dive data
and adjust the base settings of OSTC2.
Press SET/MENU in order to access the
menu in surface mode. The display
shows the pre-menu Menu?. Press
ENTER to conrm.
Logbook
Gas Setup
Reset Menu
Setup
More
Exit
Logbook
Menu:
Logbook Look up recorded data from
recent dives
Gas Setup Set gas mixes matching
the scuba set
Reset Menu Reset the OSTC2 settings
to their default values; stop decompres-
sion calculation; delete recorded data;
restart the OSTC2
Setup Inspect and modify base set-
tings for OSTC2 functions
Choose More for the following entries:
Set Time Set date and time
CCR SetPoint Menu Inspect and modi-
fy closed circuit rebreather settings
Battery Info Display Battery charge
status
Simulator Simulate dive mode; calcu-
late decostops
See the following sections for more de-
tails.
Menu Functions in Surface Mode