heinrichs weikamp Bottomtimer User manual

1
Manual
hw Bottomtimer
EN

hw Backup
Came to stay
Compact, bright and reduced to the essential.
Due to its extraordinary design, the hw Back-
up is extremely handy and robust.
The new addition to heinrichs weikamp‘s
light portfolio has a unique design that does
its job and looks good at the same time: Due
to its angular shape, the hw Backup is par-
ticularly easy to grip and can be held safely in
the hand. It can be easily stowed away on the
harness without being bulky.
High-quality materials, elaborate manufac-
turing and extremely simple handling ensure
that the light is always ready when it is need-
ed – whether for cave diving or on holiday.
Even during long dives the hw Backup will lead
you safely back to the entrance. It provides at
least 2 hours of light at constant brightness
and another 6 hours at lower brightness.
The hw Backup will remain in production at
least until 2030. Access to spare parts, service
and accessories is thus guaranteed for at least
10 years after the product launch.
The hw Backup is delivered fully rigged and
is immediately ready for use. For 185 euros in
our online shop:
www.heinrichsweikamp.com
Also availabe as team-pack!
5 backup lights for the price of 4

Thank you for choosing the hw Bottomtim-
er from heinrichs weikamp!
Hardly any other product has been asked
for more often in recent years, and now it›s
here: The hw Bottomtimer with razor-sharp
IPS-LCD, easiest operation, long battery life
(depending on display brightness setting
up to 100h) and all that packed in an ex-
tremely robust aluminium case.
The hw Bottomtimer has a very large dis-
play of depth, dive time, maximum and av-
erage depth. A stopwatch with the average
depth over the stopped time as well as tem-
perature and ascent/dive speed round off
the displays. Easy to read even in poor vis-
ibility and complete darkness.
Edgy and black - the hw bottom timer is
only available in one version. As a backup,
for ratio deco or mounted on the scooter
(scooter console in preparation!): The com-
pact hw Bottomtimer always ts.
The Bottomtimer is developed and pro-
duced entirely in Germany. It is the result
of months of testing by technical divers all
over Europe.
You can use the hw Bottomtimer intuitive-
ly. But to become familiar with its functions
and to use it in the best way, we recom-
mend you to read this manual carefully. Ad-
ditionally you nd some videos on our web-
site and facebook page which offer some
easy explanations (for example how to
change the battery or change the bungees).
Your hw Bottomtimer
For any questions relating to your hw Bottomtimer, please contact us:
• E-Mail: [e-mail]
• Post: heinrichs weikamp gmbh
Adlerstraße 7
79098 Freiburg im Breisgau
Germany
Contact

4
Content
1. Common advices..................................................................................... 6
1.1. Technical status ..............................................................................................6
1.2. About this manual..........................................................................................6
1.3. Functions overview ........................................................................................6
2. Safety advices ......................................................................................... 6
2.1. Requirements ..................................................................................................6
2.2. Before every dive .............................................................................................6
2.3. While diving......................................................................................................7
2.4. Safe use ..............................................................................................................7
2.5. Environmental conditions............................................................................7
3. Before rst use........................................................................................ 7
3.1. Depth gauge functions.................................................................................7
3.2. Operating...........................................................................................................8
4. Surface mode .......................................................................................... 8
4.1. Display ................................................................................................................8
4.2. Main menu........................................................................................................8
4.3. Display Settings...............................................................................................9
Brightness.........................................................................................................9
Units ...................................................................................................................9
Salinity ..............................................................................................................9
Colour scheme.................................................................................................9
4.4. Settings...............................................................................................................9
Time and date..................................................................................................9
Disable buttons...............................................................................................9
Reset menu....................................................................................................10
4.5. Information....................................................................................................10
4.6. Logbook ...........................................................................................................10
4.7. Simulator ........................................................................................................11

5
5. Dive mode ............................................................................................. 12
5.1. Display in dive mode...................................................................................12
5.2. Stopwatch and stopped average ............................................................13
Rate of ascent ...............................................................................................13
6. Maintenance ......................................................................................... 13
6.1. Housing ...........................................................................................................13
6.2. Bungee.............................................................................................................13
6.3. Changing the battery .................................................................................13
Calculating the capacity of the battery ...............................................14
6.4. Accessories.....................................................................................................14
Technical data ........................................................................................... 15
Disposal ..................................................................................................... 15

6
1. Common advices
1.1. Technical status
This manual corresponds to the technical
status of the depth meter hw Bottomtimer
and its Firmware 1.02 as of October 2021.
1.2. About this manual
Read this manual carefully, so you can set
up and use the hw Bottomtimer in the right
way. Keep this manual so you can consult it
also at a later time. You also nd the latest
version for download as PDF on our home-
page.
Standard settings
For important settings, the hw Bottomtim-
er shows an asterisk * behind the current
setting, if the current setting is different
from the default setting.
Terms of use
Copying or reusing this manual or parts
of this manual is not allowed without the
written permission of heinrichs weikamp.
1.3. Functions overview
Your hw Bottomtimer assists you with the
following functions:
Display: Diving depth and duration accord-
ing to EN 13319, maximum diving depth,
ambient temperature, average depth, stop-
watch, stopped average
Record: Time, duration, depth prole, tem-
perature and additional information.
2. Safety advices
2.1. Requirements
The most important factor for safe diving is
a competent and well trained diver.
2.2. Before every dive
Plan your dive. Make sure that your hw Bot-
tomtimer is ready for use and correctly con-
gured.
Congured correctly?
Check the settings of your hw Bottomtim-
er. If necessary, adjust the settings accord-
ing to your dive plan and equipment.
Battery full?
Check the battery status using the battery
indicator on the display. To ensure reliable
performance throughout your dive, the sta-
tus of the battery must be sufficiently high.
We recommend to recharge/change it at 25
percent of performance at the latest.
Device waterproof?
Make sure that the openings of the hw Bot-
tomtimer (battery compartment cover) are
closed.
Safely attached?
Make sure that your hw Bottomtimer can
be fastened safely using either the bungees
or a suitable alternative.
Display messages?
Check the screen of the hw Bottomtimer.
Do not dive if your device shows a warning.
Check the cause of the warning.

7
2.3. While diving
Take a backup system with you.
While diving, always carry a backup system
to measure duration and depth of your dive
independently from hw Bottomtimer.
Take a sufficiently long surface break be-
fore diving again.
The hw Bottomtimer doesn’t indicate
how long to wait before the next dive. It
just shows the duration time of the inter-
val. Please follow the guidelines you were
taught during your dive training.
2.4. Safe use
Do not modify the hardware. Modications
to the hardware of the hw Bottomtimer can
damage its proper function and the water-
tightness of its housing.
Only the bungee backplate and the cap of
the battery compartment can be removed.
There is no other way to open the housing
without damaging the device.
Caution
Surpassing the maximum water depth of
250 meters may cause malfunction or per-
manent damage of the device.
2.5. Environmental conditions
StorethehwBottomtimerinacool,dryplace.
Permissible temperature range for use and
storage: between -5 °C and 40 °C.
Make sure that the used battery is suitable
for the ambient temperature to be expect-
ed in your dives. For cold water diving (un-
der 10°C) we recommend the use of a Lith-
ium battery.
3. Before rst use
heinrichs weikamp delivers the hw Bottom-
timer ready to use. But nevertheless check
the battery status before using it the rst
time.
The hw Bottomtimer is attached to the arm
with a bungee. The bungee is already in-
stalled. To tighten the bungee, make a knot
above the circular cavity. Cut remaining
bungee and use a lighter to melt the small
remains of nylon.
3.1. Depth gauge functions
The hw Bottomtimer is a depth gauge as
used in technical diving as a backup. It dis-
plays depth, maximum depth, dive time,
temperature, time, battery status, stop-
watch and average depth when diving.
In the menu there is the possibility to set
the stopwatch and recalculate the average
depth.
Language
The menu of the hw Bottomtimer is only
available in English.

8
3.2. Operating
The hw Bottomtimer is operated with two
buttons on the left and right side of the
housing. To turn it on, press one of the two
buttons.
From the start screen, you can access the
menu with the left button (Menu). In the
menu you can go through the items with
the left button (NEXT) and select with the
right button (ENTER). Only one button has
to be pressed at a time. From the last entry,
the cursor jumps back to the rst.
To exit the menu or a submenu, select EXIT.
4. Surface mode
4.1. Display
On the start screen the hw Bottomtimer
shows the following items:
• ambient pressure, clock, date
• temperature
• rmware
• battery: level, type and voltage
• after diving: last dive and intervall
4.2. Main menu
In the main menu you can adjust the base
settings of the hw Bottomtimer and review
your dives in the logbook.
Sleep mode
When the hw Bottomtimer isn’t operated
at the surface, it switches into sleep mode
after 4 minutes to save energy (when using
1.5 V batteries after 2 minutes).
NEXT ENTER
From the start screen you can enter the menu. In the menu you navigate with NEXT and ENTER.

9
4.3. Display Settings
Brightness
The display brightness of the hw Bottom-
timer can be set to Eco, Medium, High and
Cave. With »Brightness Surface«, a different
value can be set for operation on the surface.
In most cases the Eco setting is sufficient,
only if the hw Bottomtimer is used frequent-
ly in shallow water and in direct sunlight is
a higher setting recommended. »Cave« is
only recommended for cave or night dives.
Default: Eco
Units
Display of depth and temperature in metric
(m/°C) or imperial (ft/°F) units.
Default: m/°C
Salinity
This setting allows you to adjust if you dive
in salt water or in fresh water. This value
has a slight effect on the display of the ac-
tual and maximum depth. To increase this
value, push ENTER repeatedly until the re-
quired value is displayed.
For most seas the setting is 3%, for the
Mediterranean and Red Seas 4% and for the
Baltic Sea 1-2%.
Setting range: 0% – 4%
Default: 0%
Rotate Screen
If necessary, the display of the hw Bottom-
timer can be turned upside down with
»Rotoate Screen«.
Default: Yes
Colour scheme
Choose the colour of the display in dive
mode. You can choose the schemes red,
green, blue and standard (white)
Default: Standard
4.4. Settings
Time and date
Menu to set time and date. With Set time
you can set the time, with Set date you can
set the date of the internal clock of the hw
Bottomtimer. You can change the values for
time and date with the ENTER button.
Choose a date format:
YYMMDD: year, month, day
DDMMYY: day, month, year (default)
MMDDYY: month, day, year
Disable buttons
With the function »disable buttons in dive
mode« the buttons can be disabled for the
time of the dive. This can be useful when

10
driving a scooter, for example. If the hw
Botttomtimer is mounted on a console,
the vibrations can cause the buttons to be
pressed accidentally.
Default: No
Reset menu
In the reset menu you can put the settings
of the hw Bottomtimer to its default values
and start the device from new.
Reboot
Restarts the hw Bottomtimer
Reset Settings
Resets all settings (not time and date) to
factory defaults. You’ll be prompted to con-
rm the action. Dives in the logbook and
the dive counter will not be reset.
Reset Logbook
Deletes all data in the logbook.
Reset Battery
When replacing the battery you have to
choose the battery type. If you were wrong,
you can correct your information in this
menu.
4.5. Information
Shows some device specic information
like serial number, installed rmware ver-
sion, number of total dives, type of battery
and the total runtime.
4.6. Logbook
The hw Bottomtimer records data during
every dive. It can be retrieved from the log-
book. The hw Bottomtimer stores data of
up to 250 dives. If the memory is full, ex-
isting records will be overwritten, starting
with the eldest.
Logbook entries are sorted in chronologi-
cal order, starting with the most recent en-
try. Every entry shows position index, date,
maximum depth and dive time.
To see details of a dive, press ENTER to se-
lect it. The rst detailed view appears with
a depth prole and an overview of the most
important data (depth, dive time, date,
clock, temperature).
Depth prole (top) and additional information (bot-
tom) in the logbook. Switchable with the right but-
ton.

11
With the right button ENTER you can call
up further information such as charging
status, average depth and surface pressure.
Use the left button to exit the view.
The logbook of your new hw Bottomtimer
may contain the prole of a pressure cham-
ber dive, it is clearly visible due to its angu-
lar shape. Each unit is tested in the pressure
chamber at heinrichs weikamp before de-
livery.
4.7. Simulator
The simulator is intended to familiarise you
with the displays in the diving mode.
To start the simulator, press »Start Simula-
tor«. A simulated dive can last a maximum
of 120 minutes and is not saved in the log-
book.
Change depth
During the simulation you can change the
depth. Press the left button repeatedly to
display the menu items. Select the desired
item with ENTER (right):
Quit?: Quit dive mode simulation. The si-
mulation will stop after a short delay.
Sim: -1m: descend 1 meter
Sim: +1m: ascend 1 meter
Reset: restart stopwatch
All other functions are similar to the dive
mode and are described there.
Note
The hw Bottomtimer stays 120 minutes in
the simulation mode until it switches to
sleep mode. Stop the simulation mode ma-
nually to save energy.
The menu in the simulator is opened with the left
button.

12
5. Dive mode
The hw Bottomtimer automatically switch-
es into dive mode when it is at 1,6 meter be-
low the surface for 10 seconds (also when it
is in sleep mode).
Note
We recommend that you manually turn on
your hw Bottomtimer before the dive to
check the settings.
It is not possible to switch underwater from
dive mode to surface mode. You cannot
change the base settings while diving.
5.1. Display in dive mode
In dive mode the hw Bottomtimer shows
the following items:
• depth in meter or feet
• maximum depth
• divetime in minutes and seconds
• water temperature in °C or °F
• average depth
• stopped depth and stopwatch
• time, battery status, surface pressure
The important displays depth, time, max-
imum depth, average depth and temper-
ature are permanently shown on the dis-
play. In the custom view in the middle you
can display the stopwatch or additional in-
formation such as time, battery status and
surface pressure.
Display in dive mode without additional informa-
tion. The stopwatch and other information can be
displayed with the right button.
Display with time, battery status and surface pres-
sure.
Display with stopwatch and stopped average.

13
5.2. Stopwatch and stopped
average
Average depth and stopwatch are displayed
in the Custom View (right button). Total avr
indicates the average depth since the start
of the dive. Stopped avr indicates the av-
erage depth for a period of time that you
choose.
The stopwatch starts with the beginning of
the dive. With Reset (left button) you can re-
start it. The stopwatch starts from new and
shows the average depth since the start of
the stopwatch (stopped avr).
Note
Total Avg« is calculated for the dive below
1m. Very shallow passages are not conside-
red for the »Total Avg«. Stopped Avg« also
takes into account shallow passages bet-
ween 0 and 1 m.
Rate of ascent
The rate of ascent is displayed when it is
higher than six meters per minute (e.g. +7/
min). When the rate of ascent is higher than
10 m/min it is displayed in red as warning.
The rate of descent is displayed when it is
higher than 6 m/min (e.g. –15m/min).
6. Maintenance
6.1. Housing
Rinse your hw Bottomtimer after every dive
with fresh water, especially after diving in
seawater.
If the housing is very dirty, put your hw Bot-
tomtimer over night in fresh water. Do not
use any cleaning agents or solvents.
6.2. Bungee
The hw Bottomtimer is delivered with bun-
gees. The bungee wristband can be set to
your arm diameter individually. To tighten
the bungee, make a reef knot or a simple
double knot above the circular cavity (tight-
en knot very strong). You can also use two
bungees and x them at the ends with g-
ure eight knots. Cut the remaining bungee
after about one centimetre and use a light-
er to melt the small remains of nylon.
6.3. Changing the battery
You can use the hw Bottomtimer with any
type of AA battery.
The use of a 1.2 V NiMH battery is not rec-
ommended due to the unfavourable volt-
age condition.
It is not possible to recharge batteries in the
hw Bottomtimer. Nevertheless, you can also
use rechargeable lithium batteries with 3.7
V and at least 0.8 Ah. Make sure that you
only use fully charged batteries.
Open the battery compartment with a
screw driver and remove the old battery. In-
With »Reset« (left button) the stopwatch is restar-
ted and the stopped average depth (Stopped Avr) is
displayed.

14
sert a new battery of the size AA with the
plus pole ahead.
Check the battery compartment o-ring
(12,5 x 2 NBR 70A). From time to time apply
a very small amount of o-ring grease to it.
Close the battery cap until it is inserted in
the housing. Do not close it with force.
The negative pole of the battery is electri-
cally connected to the housing of the bot-
tom timer via the battery cap. A good elec-
trical contact between cap and housing is
required. Therefore, turn the cap complete-
ly closed (screwdriver).
After replacing the battery the menu New
battery appears on the display. Select if you
have inserted the old battery again, a new
1,5V battery or a 3,7V lithium ion battery
The correct indication of the battery is im-
portant. This allows the hw Bottomtimer to
measure and calculate the remaining bat-
tery status more accurately.
Overview menu »New battery«:
- Keep old
- 1,5V disposable(T0)
- 3,6 V disposable (T1)
- 3,7V chargeable (T2)
The selection made (e.g. T2) appears on the
main screen.
Note
If you put in a wrong value for your battery,
you can change it in the menu »Reset« with
»Reset battery«.
Calculating the capacity of the battery
The percentage indication for 1.5 V bat-
teries is based only on the measured cell
voltage (whereas for 3.6 V batteries or re-
chargeable batteries it is calculated in a
complex way). Fluctuations in cell volt-
age due to temperature effects, uctuat-
ing current consumption (backlighting that
adapts to the environment) or even contact
problems lead directly to changed percent-
age values in the display. The reference bat-
tery is the Energizer E2 Lithium 1.5 V. The
use of low cost (discounter) batteries is not
recommended.
With a 3.7 V battery/rechargeable battery,
the capacity is calculated because the volt-
age is very constant over the life of the bat-
tery and a (high-impedance) measurement
does not have much signicance. For this, it
is necessary to specify the battery type cor-
rectly when inserting a new battery. If an
empty battery is inserted but is declared
as full, the percentage is not correct. In or-
der to catch such cases, there are also 3 very
rough voltage values for 3.6 V batteries,
which are compared against the calculated
percentage gure: 75 % (3.0 V), 50 % (2.9 V),
25 % (2.6 V) and 10 % (2.5 V). In such a case,
there may be signicant jumps in the per-
centage gure.
6.4. Accessories
Accessories and spare parts like bungees,
backplates, screen protectors, rechargea-
ble batteries, AA batteries and a mount for
scooters are available in our online shop.
www.heinrichsweikamp.com

15
Usage Depth Bottomtimer for depths up to 250 m
Housing Aluminium, milled from a single block and hard-coated, bo-
rosilicate glass
Dimensions 68 mm x 67 mm x 20 mm
Weight 165 g
Display High resolution IPS LCD, Resolution: 320 x 240 Pixel, Size: 2,4”
(63 mm diagonal)
Sensor Combined pressure/temperature sensor
Temperature range -10° – 40°C
Battery AA (14500) battery of any kind
Controls Two integrated sensor buttons
Maximum diving depth 250 m
Scop of delivery Bottomtimer, bungee (rigged for immediate use)
Accessories (opt.) Display protection
Disposal
According to the European WEEE directive, electrical and electronic equipment
must not be disposed of with household waste. At the end of its service life,
please take the device to a suitable recycling facility. You can also return it to
heinrichs weikamp for proper disposal.
Technical data

heinrichs weikamp GmbH
Adlerstraße 7
79098 Freiburg im Breisgau
Deutschland