GREISINGER GOX 100T User manual

H59.0.22.6C-06
GMH Messtechnik GmbH • Standort Greisinger
Hans-Sachs-Straße 26 • D-93128 Regenstauf
+49 (0) 9402 / 9383-0 +49 (0) 9402 / 9383-33 [e-mail]
Oxygen Measuring Device
for diving gas mixtures
WEEE-Reg.-Nr. DE 93889386
as of V1.0 Operating Manual GOX 100T

H59.0.22.6C-06 page 2 of 8
Contents
1Intended use.....................................................................................................2
2General note.....................................................................................................2
3Disposal notes..................................................................................................2
4Safety instructions............................................................................................3
5Operating and maintenance advice .................................................................4
6Operation..........................................................................................................4
7Display when switching-on the device .............................................................4
8Oxygen measuring...........................................................................................5
9Calibration ........................................................................................................6
10 Sensor rating....................................................................................................6
11 Errors and system messages...........................................................................6
12 Configuration of the device ..............................................................................7
13 Replace sensor element ..................................................................................8
14 Specification.....................................................................................................8
1 Intended use
This device measures the oxygen concentration in gas mixtures and air. The actual
measurement takes place at the opening of the sensor. Due to the design of the
sensor, the device has to be calibrated at regular intervals (at fresh air =20.95%
oxygen) to get accurate measuring values. If the sensor is used up, this will be
detected at calibration and the sensor element has to be replaced before the next
measurement.
By means of the integrated hold-function, the MOD-Display (max. operating depth)
and a specialized sensor, it is optimized for the testing of diving gas mixtures (such
as NITROX).
2 General note
Read this document carefully and get used to the handling of the device before you
use it. Keep this paper ready to hand in order to look it up if a question turns up.
3 Disposal notes
Dispense exhausted batteries at destined gathering places.
This device and the sensor must not be disposed as ‘residual waste’.
According to the ElektroG (law for bringing into market, the return and the
environmentally friendly disposal of electronic equipment) we accept the
return of this device and/or the sensor, please send it directly to us
(adequately stamped). We will dispose it appropriately and
environmentally friendly.

H59.0.22.6C-06 page 3 of 8
4 Safety instructions
This device has been designed and tested in accordance to the safety regulations
for electronic devices. However, its trouble-free operation and reliability cannot be
guaranteed unless standard safety measures and special safety advises given in
this manual will be adhered to when using it.
1. Trouble-free operation and reliability of the device can only be guaranteed if it
is not subjected to any other climatic conditions than those stated under
“Specification”.
2. Transporting the device from a cold to a warm environment condensation may
result in a failure of the function. In such a case make sure the device
temperature has adjusted to the ambient temp. before trying a new start-up.
3. The circuitry has to be designed most carefully if the device should be
connected to other devices. Internal connection in third party devices (e.g.
connection GND and earth) may result in not-permissible voltages impairing or
destroying the device or another device connected.
4. Whenever there may be a risk whatsoever involved in running it, the device
has to be switched off immediately and to be marked accordingly to avoid re-
starting. Operator safety may be a risk if:
- there is visible damage to the device or the device is not working as specified.
- the device has been stored under unsuitable conditions for a longer time.
In case of doubt, please return device to manufacturer for repair or
maintenance.
5. Warning: Do not use this product as safety or emergency stop device or in
other applications where failure of the product could result in personal injury or
material damage. Failure to comply with these instructions could result in death
or serious injury and material damage.
6. This device only serves as supervision by the monitoring of essential or other
for the customer important systems.
It must not be used instead of compulsory approval monitoring devices and it is
not designed for that purpose. If this device is used for the monitoring of such
systems on its own, the manufacturer will not assume liability for damages
whatsoever.
7. Caution, acid! The sensor contains KOH. This can cause severe chemical
burns. If leaking, avoid contact!
If there was contact:
- to skin: Flush contacted area with large amounts of water
for several minutes.
- to clothing: remove contaminated clothing.
- to eyes: Flush with large amounts of water for several
minutes, obtain medical treatment.
After swallowing:
- give large volumes of water. DO NOT induce vomiting!
- Obtain medical treatment.

H59.0.22.6C-06 page 4 of 8
5 Operating and maintenance advice
The battery has to be taken out, when the device is stored above 50°C.
Handle the device and the sensor with care and only use it according its
specification. The connectors have to be saved from humidity and dirt.
Unplug the sensor not by pulling the cable, but the plug.
Tip: It is recommended to take the battery out, when the device is stored for a
longer period of time.
6 Operation
Display- and Operation elements
1. display of the oxygen concentration in % or of
MOD in meters(n) or feet(F)
2. BAT-warning: battery is used up and has to be
replaced (measuring is valid)
On/Off switch
Press shortly: change between
: actual value % oxygen
: hold value % oxygen,
: hold value MOD in meters(n)
or feet(F)
Press shortly: short display of the sensor rating (calculated after the last
calibration) (i.e. “100.P“ = 100%)
Press long: start calibration (see also chapter 9 Calibration)
First start
If not already done: plug the sensor to the device.
Screw flow-diverter on sensor, plug on transparent T-piece
Switch the device on with the key.
Start the calibration by pressing the key for 2 seconds, until is
displayed. After the calibration the device is ready for measuring.
(see also chapter 9 Calibration)
7 Display when switching-on the device
Start and display test
If switch-off delay “P.oF” (power off) is active, this is signalled at the turn-on
procedure.

H59.0.22.6C-06 page 5 of 8
8 Oxygen measuring
- Switch on instument, calibrate (refer to chapter 9 Calibration)
-> the current oxygen concentration [%] will be displayed
- hold sensor to valve like shown (good
contact necessary, otherwise there
could be measured to low values)
- Open valve a little, until You can hear
gas flow.
Attention: Do not open to far!
- When measurement display is stable,
press -key:
hld (Hold = measurement is held) and
oxygen concentration [%] are displayed alternating
- pressing again:
The Maximum Operating Depth (MOD) is displayed alternating to hld
(nis the symbol for display in meters, Ffor feet)
- pressing again: return to current oxygen concentration display
The oxygen measurement depends on air pressure. The current pressure can be entered
during configuration.
If you measure at atmosphere and the calibration took place at the same conditions, the
pressure value has not to be adjusted necessarily, because the same pressure is used for
calibration and measuring.
(If the measurement is carried out at other pressure conditions than the calibration: The
actual pressure has to be entered in the configuration for measurement and calibration. )
The sensor’s temperature dependency is compensated internally. However for best results
try to keep the same temperature both during calibration and measuring.
Temperature differences between sensor and gas may cause additional errors!
Therefore wait an appropriate period of time until the sensor has adjusted its temperature to
the gas that is measured. A suitable flow of the gas around the sensor increases the
adjustment significantly.
Try to avoid warming of the sensor by touching it during measurement or calibration.
When measuring bottled gas, consider that the gas coming out is cooler than the ambient
because of the pressure loss! Strong air flows can produce an over pressure at the sensor –
possible source of measuring/calibration errors!
The nominal life time can be shortened by:
- Wrong storage / operation temperature
- Permanent use with dry gases (compressed gas).
It helps to put the sensor to normal-humid ambient air in measuring breaks (“flush”
system with fresh air).
The optimum operation position is: with the sensor inlet pointing downwards

H59.0.22.6C-06 page 6 of 8
9 Calibration
In order to compensate for ageing of the sensor and air pressure fluctuations due
to weather changes, the sensor has to be calibrated at regular intervals. The
sensor will be calibrated to the atmospheric oxygen concentration of 20.95%.
We recommend to calibrate directly before starting the measuring process.
Calibration:.The sensor has to be subjected to air (make sure that rooms are
thoroughly aired).
Press the key for 2 sec till appears.
The calibration will be automatically completed as soon as the measuring value is
stable (takes a few seconds). Afterwards the rating of the sensor state will be
shown for a short time.
If an error message (CE.3, CE.4, CE.6) is displayed, the sensor signal is
invalid. Press any key to restart, the previous calibration will be restored.
The display is blinking afterwards until a valid calibration is performed.
10 Sensor rating
The rating of the sensor state is calculated and saved after successful calibration.
Watch sensor rating: Press shortly the key, the display shows for a short
time i.e. = 100%.
The rating is displayed in 10 percent steps: 100% = optimal sensor status. Lower values are
indicating that the sensor life time will soon be reached. (50% doesn’t mean 50% of the life
time, but 50% of the reference signal!). Erroneous P.AbS entries may cause to low ratings.
11 Errors and system messages
no
display
The battery is used up and has to be exchanged, or the device is defective
blinking
display
The last calibration was not successful. A new calibration has to be performed!
The battery is used up, for a short period further measurements are possible
The battery is used up and has to be replaced, measurements are no more
possible
Calibration error: sensor voltage is too low (sensor used up or wrong chosen air
pressure)
Calibration error: sensor voltage is too high (wrong chosen air pressure or
sensor defective (membrane crack, etc.)
Calibration error: signal not stable
Measuring error: range has been exceeded
Measuring error: measuring value has fallen below permitted range
System error: the device is defective or considerably out of the allowed ambient
temperature range
Value could not be calculated (e.g. input of MOD-calculation is error)

H59.0.22.6C-06 page 7 of 8
12 Configuration of the device
Follow this instructions to configure the functions of the device:
Switch the device off.
Press mode-button and keep it pressed, while turning the instrument on.
Release the mode button after the segment test ( ) .
The first parameter is displayed .
If a parameter should be changed press key up or down ( ), the present
setting of the parameter will be shown and can be changed via up/down keys.
Jump to the next parameter by pressing .
Parameter
Value
Information
button
buttons
Auto Power-Off (turn-off delay) factory setting: 20 min
1 …120
Turn-off delay in minutes. If no key is pressed for the time
adjusted in this parameter, the device is automatically switched
off to safe battery power. (adjustable range 1 to 120 min)
OFF
auto power-off is deactivated (continuous operation)
Abs. air pressure factory setting: 1013 mbar
500 …1200
Input of absolute pressure (of measured gas). The absolute
pressure is depending on altitude above sea level (refer to
following table) and on the weather.
Max. oxygen partial pressure for MOD display
factory setting: 1.40 bar
1.00 …1.60
Input in bar
Unit for MOD display factory setting: n
N
meters
F
feet
Pressing again stores the settings, the instrument restarts.
Please note: If there is no key pressed within the menu mode within 2 minutes, the
configuration will be cancelled, the entered settings are lost!
Air pressure depending on the altitude above sea level
Altitude
Abs. air pressure
Altitude
Abs. air pressure
0 m
1013 mbar
800 m
921 mbar
100 m
1001 mbar
1000 m
899 mbar
200 m
989 mbar
1200 m
877 mbar
300 m
978 mbar
1400 m
856 mbar
400 m
966 mbar
1600 m
835 mbar
500 m
954 mbar
1800 m
815 mbar
600 m
943 mbar
2000 m
795 mbar

H59.0.22.6C-06 page 8 of 8
13 Replace sensor element
Unplug the sensor, unscrew the white protection housing and take out sensor
element. Remove rubber disks and put it on the new sensor. Put the new sensor
element into the housing, screw it down and plug it. Then start the calibration.
14 Specification
Measuring range:
0.0 ... 100.0 %O2 (oxygen concentration)
MOD (based on O2conc. and max. O2-partial pressure)
Accuracy:
calibrated device at nominal temp.: ± 0.1 %O2 ± 1 digit
Sensor linearity: < 2 vol.-%: +/- 0.1%; < 25 vol.-%: +/-
0.5%; < 100 Vol.-%: +/- 1.0%
Sensor connection
0.7m connection cable (fixed to device) with jack connector
Sensor:
electrochemical partial oxygen pressure sensor, integrated
in sensor housing (type for replacement: GOEL 370)
Response time:
90% in < 10 sec., depending on temperature
Operating life:
guaranteed 12 months (assuming appropriate usage)
Operating pressure:
0.5 to 2.0 bar absolute. (at one-sided strain: max. 0.25 bar
over-/under-pressure)
Display:
approx. 13 mm high, 3½-digit LCD
Pushbuttons:
3 keys for ON/OFF, min-/max-value display, calibration
Nominal temp.:
25°C
Ambient temp.:
0 to 45°C (sensor), -20 to 50°C (device)
Relative humidity:
0 to 95 %RH (not condensing)
Storage temperature:
-15 to 60°C (sensor), -20 to 70°C (device)
Power Supply:
9V-battery type 6F22 (in scope of supply)
Power Consumption:
0.14mA (standard zinc carbon battery: >2100 hours!)
Battery Change Indicator:
automatically if battery is used up: "BAT"
Auto-Power-Off:
when activated, the device switches automatically off, if it is
not operated for longer time (selectable 1..120min).
Housing:
Dimensions:
impact-resistant ABS, transparent panel, front side IP65
approx. 106 x 67 x 30 mm (L x W x D) without sensor cable
Weight:
approx. 185g incl. battery and sensor
EMC:
The device corresponds to the essential protection ratings
established in the Regulations of the Council for the
Approximation of Legislation for the member countries
regarding electromagnetic compatibility (2004/108/EG).
Device meets EN 61326-1:2006, Additional fault: <1%