GREISINGER GMH 3691 User manual

H36.0.12.6C-09
GREISINGER electronic GmbH
D - 93128 Regenstauf, Hans-Sachs-Straße 26
+49 (0) 9402 / 9383-0 +49 (0) 9402 / 9383-33 [email protected]
Hand-held measuring device with alarm function
for gaseous oxygen and temperature
as of version V1.6 Operating Manual GMH 3691
WEEE-Reg.-Nr. DE93889386

H36.0.12.6C-09 Operating Manual GMH 3691 page 2 of 12
Index
1DESIGNATED USE.................................................................................................................................................2
2GENERAL NOTE....................................................................................................................................................2
3OPERATING AND MAINTENANCE ADVICE........................................................................................................3
4SAFETY REQUIREMENTS ....................................................................................................................................3
5DISPLAY AND CONTROL ELEMENTS.................................................................................................................4
5.1DISPLAY ELEMENTS ............................................................................................................................................4
5.2 PUSHBUTTONS ...................................................................................................................................................5
5.3 CONNECTIONS....................................................................................................................................................5
6CONFIGURATION ..................................................................................................................................................5
7NOTES TO SPECIAL FUNCTIONS .......................................................................................................................7
7.1 INPUT OF ABSOLUTE PRESSURE ('P.ABS').............................................................................................................7
7.2 ZERO DISPLACEMENT (’OFFSET’) TEMPERATURE..................................................................................................7
7.3 ALARM FUNCTION ...............................................................................................................................................7
7.4 BASE ADDRESS (’ADR.’)......................................................................................................................................7
8OXYGEN MEASURING - PLEASE NOTE .............................................................................................................7
8.1 APPLICATION OF THE DIFFERENT SENSOR TYPES GGO 369 /370 AND GOO 369 /370..........................................7
9CALIBRATION OF THE OXYGEN SENSOR.........................................................................................................8
9.1 1-POINT AIR CALIBRATION ('CAL AIR')..................................................................................................................8
9.2 2-POINT CALIBRATION ('CAL 2-PT').....................................................................................................................8
9.3 VALUATION OF SENSOR STATE (ELEC)................................................................................................................8
10 ERROR AND SYSTEM MESSAGES..................................................................................................................9
10.1 ERROR AND SYSTEM MESSAGES DURING OXYGEN CALIBRATION.......................................................................9
11 THE SERIAL INTERFACE................................................................................................................................10
11.1 THE FOLLOWING INTERFACE FUNCTIONS WILL BE SUPPORTED:.........................................................................10
12 SPECIFICATION ...............................................................................................................................................11
13 DISPOSAL INSTRUCTION:..............................................................................................................................11
1 Designated Use
The GMH 3691 measures the oxygen partial pressure and the oxygen concentration in gas mixtures and air.
For the measurement a external sensor of the type GOO ... or GGO ... is required. The measurement takes place at
the opening of the external 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.
2 General Note
Read this document carefully and get used to the operation of the device before you use it. Keep this document
within reach for consulting in case of doubt.

H36.0.12.6C-09 Operating Manual GMH 3691 page 3 of 12
3 Operating and Maintenance Advice
a) When to replace battery:
If and ´bAt´ are shown in the lower display the battery has been used up and needs to be replaced. The de-
vice will, however, operate correctly for a certain time.
If ´bAt´ is shown in the upper display the voltage is too low to operate the device; the battery has been completely
used up.
Please note: The battery has to be taken out, when storing device above 50°C.
We recommend to take out battery if device is not used for a longer period of time.
b) Treat device and sensor carefully. Use only in accordance with above specification. (do not throw, hit against etc.).
Protect plug and socket from soiling.
c) Make sure to use sensors that are suitable for the device. Unsuitable measuring probes may lead to the destruction
of the measuring device and the measuring probes.
d) When connecting the electrode the connector may not lock to the jack correctly. In such a case hold the connector
not at the case but at the buckling protection of the cable during the plug in.
Don't connect electrode canted! If plug is entered correctly, it will slide in smoothly.
To disconnect sensor do not pull at the cable but at the plug
e) Mains operation:
When using a power supply device please note that operating voltage has to be 10.5 to 12 V DC.
Do not apply overvoltage!! Cheap 12V-power supply devices often have excessive no-load voltage. We, there-
fore, recommend using regulated voltage power supply devices. Trouble-free operation is guaranteed by our
power supply devices. Trouble-free operation is guaranteed by our power supply, GNG10/3000.
Prior to connecting the plug power supply device with the mains supply make sure that the operating voltage
stated at the power supply device is identical to the mains voltage.
4 Safety Requirements
This device has been designed and tested in accordance with the safety regulations for electronic devices.
However, its trouble-free operation and reliability cannot be guaranteed unless the standard safety measures and
special safety advises given in this manual will be adhered to when using the device.
1. Trouble-free operation and reliability of the device can only be guaranteed if the device is not subjected to any
other climatic conditions than those stated under "Specification".
2. If the device is transported from a cold to a warm environment condensation may cause in a failure of the func-
tion. In such a case make sure the device temperature has adjusted to the ambient temperature before trying a
new start-up.
3. If device is to be connected to other devices (e.g. via serial interface) the circuitry has to be designed most care-
fully. 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.
Warning: If device is operated with a defective mains power supply (short circuit from mains voltage to output
voltage) this may result in hazardous voltages at the device (e.g. sensor socket, serial interface).
4. If there is 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
- 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 these products as safety or emergency stop devices or in any other application 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 an it is not planed for that purpose.
If this device is used for the monitoring of such systems on its own, the manufacturer will not assume li-
ability for damages whatsoever.

H36.0.12.6C-09 Operating Manual GMH 3691 page 4 of 12
5 Display and control elements
5.1 Display elements
Display with two sensors connected:
Main display: possible views:
Oxygen concentration in % (% O2)
Oxygen partial pressure (hPa)
Secondary display:
Sensor temperature (°C or °F)
The desired view can be selected by pressing the -key.
Special display elements:
Min/Max/Hold:
shows if a min., max. or hold value is displayed in
either the main or the secondary display.
ok arrow:
indicates that oxygen and temperature values have
been stable for a longer period of time
CAL arrow:
indicates that an automatic oxygen calibration is
carried out
Alarm arrow:
indicates an alarm by blinking
Warning triangle:
indicates a low battery, full logger storage, etc.
Display at reboot:
After switching on the instrument performs a segment test of 2 seconds.
Afterwards some configurations are displayed sequentially: alarm function, air pressure and if activated:
offset settings. (p.r.t Chapter 6)
Tip: The display of these settings can be aborted by pressing a key after the segment test (keys 2 - 6).
%
°C
2
LoggAL
mg/l
ok
mmHg
hPa
SAL
hPa %O
CAL
MAX
MIN HLD
%
°C
2
LoggAL
mg/l
ok
mmHg
hPa
SAL
hPa %O
CAL

H36.0.12.6C-09 Operating Manual GMH 3691 page 5 of 12
5.2 Pushbuttons
On/off key
+
min/max when taking measurements:
press shortly: min. or max. measuring value will be
displayed
press for 1 sec.: the min. or max. value will be deleted
up/down for configuration:
to enter values, or change settings
CAL:
press shortly: show state of the electrode
press for 2 sec.: start oxygen calibration
Set/Menu:
press (Set) shortly: change between
oxygen concentration[%] and
oxygen partial pressure [hPa].
press (Menu) for 2 sec.: configuration will activated
Store/Quit:
Measurement: Hold current measuring value (’HLD’ in
display)
Set/Menu: Acknowledge setting, return to measuring
5.3 Connections
Interface: connection for electrically isolated interface adapter
(accessory: GRS 3100, GRS3105 or USB3100)
Connection for oxygen sensor
with integrated temperature probe
The mains socket is located at the left side of the instrument.
6 Configuration
For configuration of the device press -key for 2 seconds: the main menu of the configuration will be called up.
Use key to select a sub-menu, use the key to actually go into the selected sub-menu and to change parame-
ters.
Use the keys and to set the individual value for the parameter. Press the key again to memorize the
changes ant to change to the main menu. Use key to leave the configuration.
’Pressure ABs.’: Input of Absolute Pressure
500 … 2000 hPa
abs.
The calculated oxygen values will refer to the en-
tered absolute.
’Offset’: Zero Point Displacement of the Temperature
-3.0 °C ... 3.0 °C
or
-5.4 °F ... 5.4 °F
The zero point of the measurement will be displaced
by the value set to compensate for sensor and
measuring device deviations.
off:
Zero point displacement is deactivated (=0.0°)
1 2 3
4 5 6
ON
OFF max CAL
Storemin
Set
Menu Quit
2
LoggAL
mg/l
ok
mmHg
hPa
SAL
hPa %O
CAL
max
min
2
5
°C
2
LoggAL
mg/l
ok
mmHg
hPa
SAL
hPa %O
CAL
max
min
2
5

H36.0.12.6C-09 Operating Manual GMH 3691 page 6 of 12
’AL.’: Alarm Functions
off:
alarm function switched off
No.So:
alarm function active, alarm will be displayed by the 'AL'-arrow
on:
alarm function active, alarm will be displayed by the 'AL'-arrow,
additionally a short alarm will be sounded every 2 s.
’AL.Lo’: Lower Alarm Limit (if alarm is active, only)
0.0 … 100.0 %
Enter lower alarm limit.
The values entered have to be smaller or equal to
the upper alarm limit.
’AL.Hi’: Upper Alarm Limit (if alarm is active, only)
0.0 … 100.0 %
Enter upper alarm limit.
The values entered have to be greater or equal to
the lower alarm limit.
’CAL’: Choice of Calibration
Air:
Simple 1 point calibration at atmospheric air (= 20.95 %)
2-Pt:
2 point calibration: one point = air, another point can be en-
tered manually
’Unit t’: Selection of Temperature Unit °C /°F
°C:
All temperature values in degrees Celsius
°F:
All temperature values in degrees Fahrenheit
’Power.off’: Selection of Power-Off Delay
1...120:
Power-off delay in minutes. Device will be automatically
switched off as soon as this time has elapsed if no key is
pressed/no interface communication takes place. (automati-
cally deactivated for cyclic loggers)
off:
automatic power-off function deactivated
(continuous operation, e.g. in case of mains operation)
’Address’: Selection of Base Address’
01, 11, 21, …, 91:
Base address for interface communication. Chan-
nel 1 will be addressed by the set base address,
channel 2 and 3 will have the following addresses.
(Example: base address 21 - channel 1 = 21,
channel 2 = 22, channel 3 = 23)
Using the interface converter GRS3105 it is possible to connect several devices to a single interface. As
a precondition the base addresses of all devices must not be identical. In case several devices are con-
nected via one interface make sure to configurate the base addresses accordingly.
2
LoggAL
mg/l
ok
mmHg
hPa
SAL
hPa %O
CAL
max
min
2
5
%
2
LoggAL
mg/l
ok
mmHg
hPa
SAL
hPa %O
CAL
max
min
2
5
%
2
LoggAL
mg/l
ok
mmHg
hPa
SAL
hPa %O
CAL
max
min
2
5
2
LoggAL
mg/l
ok
mmHg
hPa
SAL
hPa %O
CAL
max
min
2
5
°C
2
LoggAL
mg/l
ok
mmHg
hPa
SAL
hPa %O
CAL
max
min
2
5
max
min
2
5
max
min
2
5

H36.0.12.6C-09 Operating Manual GMH 3691 page 7 of 12
7 Notes to Special Functions
7.1 Input of absolute pressure ('P.Abs')
To get most accurate measurings the absolute pressure should be inspected both before calibration and measuring.
The determining pressure is the actual pressure at the sensor membrane. Keep in mind that gas flows may change
the absolute pressure at the membrane and therefore may cause measuring errors!
7.2 Zero Displacement (’Offset’) temperature
A zero displacement can be carried out for the temperature measurement.
temperature displayed = temperature measured - offset
Standard setting: ’off’ = 0.0°, i.e. no zero displacement will be carried out. The zero displacement is mainly used to
compensate for sensor deviations. Unless ’off’ is set, this value will be displayed shortly after the device is switched on.
7.3 Alarm function
If the alarm function has been activated (p.r.t. configuration), an alarm will be issued under the following circum-
stances:
•measuring value smaller or equalling lower alarm limit 'AL.Lo'
•measuring value higher or equalling upper alarm limit 'AL.Hi'
•no electrode connected or error in sensor
•measuring values exceeding/falling below measuring ranges
•battery voltage too low
•error in device ('Err.7')
The alarm function is supported by the interface, thus, it can easily be monitored by a computer connected.
7.4 Base Address (’Adr.’)
Using the interface converter GRS3105 it is possible to connect several instruments to a single interface. As a pre-
condition the base addresses of all devices must not be identical. In case several devices will be connected via one
interface make sure to configurate the base addresses accordingly. Channel 1 will be addressed by the base ad-
dress set, channels 2 and 3 will have the following addresses.
(Example: base address 21 - channel 1 = 21, channel 2 = 22, channel 3 = 23)
8 Oxygen Measuring - please note
When measuring gases, please consider the following:
Calibration and measuring are depending of the absolute pressure at the sensor!
Therefore check absolute pressure before calibration and measuring.
Sensor temperature and gas temperature should be the same!
Temperature differences may cause additional measuring errors! It may take from several minutes up to
several hours (depending on the measurement setup) until both temperatures are adjusted.
Temperature differences may cause additional measuring errors! In worst case conditions it may take up to
several hours until both temperatures are adjusted. A suitable flow of the gas around the sensor element in-
creases the adjustment significantly..
8.1 Application of the different sensor types GGO 369 / 370 and GOO 369 / 370
GGO 369 / 370 (closed sensor)
For measurements at atmosphere and in systems without over or under pressure the GGO ... is sufficient.
Additionally the GGO ... can be screwed impermeable to systems with a known pressure. (Attention: please note the
specified operating pressure for one-sided strain).
The actual pressure has to be entered (p.r.t. ‚Configuration‘). The pressure will be compensated and no additional
mesuring error will occur.
GOO 369 / 370 (open sensor)
The sensor is equipped with drillings at the end and because of its special construction the measuring gas streams
optimally around the sensor. No pressure can appear while gas blows to the sensor, which otherwise would result in
erroneous measurings. At ‚P.Abs‘ the atmospheric pressure has to be entered.
The temperature compensation speed of the sensor also is optimized by this design. The measuring gas escapes
into the air. Especially the measuring of gases from compressed gas bottles, where the expansion of the gas leaving
the bottle lowers the temperature, is optimized with regard to the temperature compensation and pressure errors.
The gas flow should be chosen in a suitable range, where no overpressure can happen, esp. if the sensor is con-
nected directly to the source e.g. by means of a tube.

H36.0.12.6C-09 Operating Manual GMH 3691 page 8 of 12
9 Calibration of The Oxygen Sensor
In order to compensate for ageing of the sensor, the sensor has to be calibrated at regular intervals.
The device is equipped with two easy to handle calibration functions. We recommend to calibrate at least once a
week or, for optimum measuring results, directly before starting the measuring process.
Check the absolute pressure which you have preset in the device before carrying out any calibration!
9.1 1-Point air calibration ('CAL Air')
Electrode has to be subjected to air (make sure that rooms are thoroughly aired).
Start calibration: press -key for 2 sec.
The display will show 'CAL'; calibration will be automatically completed as soon as the measuring values for oxygen
and temperature are stable.
Then the electrode state resulting of the successful calibration will be shown for a short time (evaluation in 10%
steps).
9.2 2-Point calibration ('CAL 2-Pt')
The electrode will be automatically calibrated to the oxygen concentration of atmospheric air (20.95%) and addition-
ally to a second oxygen concentration of your choice.
1. Start calibration: press -key for 2 sec.
2. Choice of first calibration point:
The calibration can be carried out starting with the "manual value" or the fixed value "air".
To change the selection for the first calibration point between "manual value" (display = '----') and "atmospheric
air" (display = 'air') press -key.
Please note: If You started editing the manual value once, the change to "air" is no more possible.
3. Calibration point 1: (Pt.1)
Expose sensor to the chosen gas and wait until temperatures of gas and sensor have adjusted.
Calibration point = manual value:
- enter current oxygen concentration of your gas with and -keys. (input range: 0.0..10.0%; 30.0..100.0%)
Please note: If no key is pressed within 2 minutes, the entry will be cancelled and the display returns to "----".
Calibration point = Air:
- the calibration will carried out to a value of 20.95%
After detection of a stable value - permanent display - the calibration value can be acknowledged by .
4. Calibration point 2: (Pt.2)
same procedure as calibration point 1
5. After successful ending of the calibration the electrode state resulting of the calibration will be shown for a short
time (evaluation in 10% steps).
In case of error messages being displayed during the calibration process, please refer to our notes at the
end of this manual! If a calibration cannot be carried out after an extended period of time, at least one of the
measuring values in unstable (oxygen content, temperature). Please check your measuring arrangements!
9.3 Valuation of sensor state (ELEC)
Watch sensor state: press key "CAL" shortly once display show for a short time xx% ELEC
It will show the electrode state resulting of the last successful calibration carried out.
The valuation is displayed in 10 Percent steps: 100% means optimal sensor condition. Lower values are indicating
that the sensor life time will be reached soon.
Remark: But also a erroneous pressure entry may be the cause of low valuation values.

H36.0.12.6C-09 Operating Manual GMH 3691 page 9 of 12
10 Error And System Messages
Display
Description / Reason
Remedy
No sensor
or sensor defective
Connect sensor
sensor defective => return sensor to manufac-
turer for repair
Low battery voltage
device will only continue operation for
a short time
replace battery
Low battery voltage
replace battery
- If mains operation: wrong voltage
replace power supply, if fault continues to exist:
device damaged
No display
or
mazy characters
- Battery voltage too low
replace battery
- If mains op.: power supply defective
or wrong voltage/polarity
check/replace mains supply
- System error
disconnect battery or power supply, wait for a
short time, re-connect
- Device defective
return to manufacturer for repair
Values exceeding measuring range
Are there any values exceeding the measuring
range specified?
->measuring value too high
Sensor/cable defective
-> replace probe
Values below measuring range
Are there any values below the measuring
range specified?
-> measuring value too low
Sensor/cable defective
-> replace probe
System fault
switch on again: if fault continues to exist, de-
vice is damaged
-> return to manufacturer for repair
No sensor
connect suitable sensor
Error in sensor
Sensor defective => return to manufacturer for repair
Temperature display correct,
oxygen display incorrect
check: plug in sensor housing connected?
Open PG-glanding and pull up plug as far as
possible.
Value could not be calculated
One measuring variable required for calculation
is missing (no sensor) or incorrect (over-
flow/underflow)
10.1 Error and System Messages during Oxygen Calibration
Display
Description / Reason
Remedy
(AL
ERR. 1
Wrong temperature
temperature has to be between 5 and 40°C
(AL
ERR.3
Sensor slope to low
check calibration environment (p.r.t. 'Calibration
of the oxygen sensor'). If error are unremedied
replace sensor element.
(AL
ERR.4
sensor slope to high
check calibration environment
(p.r.t. 'Calibration of the oxygen sensor')
(AL
ERR.5
calculated offset to large
check calibration environment (p.r.t. 'Calibration
of the oxygen sensor'). If error are unremedied
replace sensor element.

H36.0.12.6C-09 Operating Manual GMH 3691 page 10 of 12
(AL
ERR.6
input signal (O2-partial pressure) to
high
check calibration environment (p.r.t. 'Calibration
of the oxygen sensor'). If error are unremedied
replace sensor element.
11 The serial interface
All measuring data and settings of the device can be read and changed by means of the serial interface and a suit-
able electrically isolated interface adapter (GRS3100, GRS3105 or USB3100).
In order to avoid faulty transmission, we have designed elaborate security measures for interface communication.
The following standard software packages are available for data transfer:
- EBS20M more channel software to display of all measuring value (channel 1 ... 4)
- EASYCONTROL: Universal multi-channel software (EASYBUS-, RS485-, or GMH3000- operation possible) for
real-time recording and presentation of measuring data in the ACCESS®-data base format.
In case you want to develop your own software we offer a GMH3000-development package including:
- a universally applicable Windows functions library ('GMH3000.DLL') with documentation, can be used by all ‘es-
tablished’ programming languages, suitable for: Windows XP™, Windows Vista™, Windows 7™.
- Programming examples Visual Basic 4.0, Delphi 1.0, Testpoint
11.1 The following interface functions will be supported:
Channel
Dll-
Code
Name / function
1
(oxygen
concentration)
2
(oxygen partial
pressure)
3
(Temperature)
4
(abs. air
pressure)
x
x
x
x
0
Read nominal value
x
1
Set nominal value
x
x
x
x
3
Read system status
x
x
x
x
6
Read min. value
x
x
x
x
7
Read max. value
x
12
Read ID-no.
x
22
Read min. alarm limit
x
23
Read max. alarm limit
x
32
Read configuration flags
x
102
Set min. alarm limit
x
103
Set max. alarm limit
x
160
Set configuration flags
x
174
Delete min. value
x
175
Delete max. value
x
x
x
x
176
Read min. measuring range
x
x
x
x
177
Read max. measuring range
x
x
x
x
178
Read meas. range unit
x
x
x
x
179
Read meas. range decimal point
x
x
x
x
180
Read meas. range meas. mode
x
194
Set display unit
x
x
x
x
199
Read meas. type in display
x
x
x
x
200
Read min. display range
x
x
x
x
201
Read max. display range
x
x
x
x
202
Read unit of display
x
x
x
x
204
Read decimal point of display
x
208
Read channel count
x
210
Read electrode state
x
216
Read offset correction
x
217
Set offset correction
x
222
Read power-off delay
x
223
Set power-off delay
x
240
Reset unit
x
254
Read program identification

H36.0.12.6C-09 Operating Manual GMH 3691 page 11 of 12
12 Specification
Measuring range:
Oxygen concentration 0.0 ... 100.0 % O2
Oxygen partial pressure 0 ... 1100 hPa
Sensor temperature -20.0 ... 50.0 °C
Pressure range 500 ... 2000 hPa abs.
Accuracy device: (± 1 digit) (at 1000 hPa abs. and nominal temperature)
Oxygen concentration ± 0.1 % O2
Oxygen partial pressure ± 1 hPa
Sensor temperature ± 0.2 °C
Nominal temperature: 25 °C
Working temperature: 0 to +50 °C
Relative humidity: 0 to 95 %RH (non-condensing)
Storage temperature: -20 to +70 °C
Sensor connection: 6-pin Mini-DIN-socket
Display: 2 four digit LCDs (12.4 mm high and 7 mm high) for temperature, and for min./ max
values, hold function, etc. as well as additional pointing arrows.
Pushbuttons: 6 membrane keys altogether for on/off switch, selection of thermoelements, min. and
max. value memory, hold-function etc.
Interface: serial interface (3.5 mm jack), serial interface can be directly connected to USB or
RS232 interface of a PC via interface adapter USB3100, GRS3100 or GRS3105
(see accessories).
Power supply: 9V-battery, type IEC 6F22 (included) or additional d.c. connector (internal pin Ø 1.9 mm)
for external 10.5-12V direct voltage supply.
(suitable power supply: GNG10/3000)
Power consumption: approx. 1.5 mA, during audio alarm approx. 2 mA
Automatic-off-function: Device will be automatically switched off if no key is pressed/no interface communica-
tion takes place for the time of the power-off delay. The power-off delay can be set to
values between 1and 120 min.; it can be completely deactivated.
Min-/max-value memory: Both the max. and the min. value will be memorized for each measurement taken.
Hold-function: Press button to memorize current measuring values.
Alarm function: monitoring of alarm limits (% oxygen), measuring range limits (% oxygen and tempera-
ture) and device faults.
alarm via display element and interface, additional audio alarm optional
Housing dimensions: 142 x 71 x 26 mm (L x W x D)
impact-resistant ABS plastic housing, membrane keyboard, transparent panel. Front
side IP65, integrated pop-up clip for table top or suspended use.
Weight: approx. 155 g (device incl. Battery)
EMC: The device corresponds to the essential protection ratings established in the Regula-
tions of the Council for the Approximation of Legislation for the member countries re-
garding electromagnetic compatibility (2004/108/EG)
Additional fault: <1%
13 Disposal instruction:
Batteries must not be disposed in the regular domestic waste but at the designated collecting points.
The device must not be disposed in the unsorted municipal waste! Send the device directly to us (sufficiently
stamped), if it should be disposed. We will dispose the device appropriate and environmentally sound.
_
+

H36.0.12.6C-09 Operating Manual GMH 3691 page 12 of 12

50
WK
Handheld instrument
Display / ControllerLogger / EASYBusTransmitterTemperature probeAlarm / Protection
Air oxygen measuring device
 Doubledisplayforoxygenandtemperature
 Measuredunits:O2-concentrationand
O2-partialpressure
 Alarmdetectorwithintegratedhorn
 Automatictemperaturecompensation
 Min./Max.valuememory,Holdfunction
 Serialinterface,devicecanbeconnected
tobussystem(upto5devicescanbecon-
nectedtoonePCinterface)
 Batteryandd.c.operation
 Widerangeofapplication
 Mostsimplecalibrationinatmosphericair
GMH 3691 Sensornotincluded-pleaseorderseparately!
Residual oxygen meas. device
forquickandcost-effectivemeasure-
mentofresidualoxygen
GMH 3691 GOG
Application:
Essentially there, where delicate products are
conservedbylow-oxygenatmospheres(protec-
tivegas),thisinstrumentissuitabletocheckthe
residualoxygencontent.
 packaging industry
 food industry
Specication:(summary)
Meas. range:0,0...100,0%O2(O2-concentration)
Accuracy:(whole system - during carefully
calibration and measuring)
1-point-calibration: ±0.2%O2±1digit
         (forconcentrations<10%)
2-point-calibration: ±0.1%O2±1digit
         (forconcentrations<10%)
Oxygen probe: Oxygen-partialpressureprobe,
builtinexternalsensorhousing
Response time: T90<10sec.,dependingon
temperature
Operation life: warrantyforsensorelement
12months(appropriateappli-
cationandambientpressure)
Working pressure:0.5to2.0barabs.
Over-/under-pressure:max.0,25bar
Working temperature:0to50°C(sensor),
          -20to50°C(device)
Relative humidity: 0to+95%RH
(non-condensing)
Storage temperature: -15to60°C(sensor),
          -20to70°C(device)
Power supply:9VbatterytypeIEC6F22
Dimensions case:approx.394x294x106mm
Weight: approx.1400g(cpl.set)
for additional technical data refer to
GMH3691 and accessory sensors p. 51
Scope of supply:
InstrumentGMH3691,handpumpwithairtube,
GOGoxygensensorwithpenetrationneedle,case
GKK3500, spare needle ø0,9mm, rubber foam
sticker(40pieces),operatingmanual.
Spare elements, accessories:
GOG-SET Setwithoutinstrument 
Scopeofsupply:GOGoxygensensorwith
penetrationneedle,handpumpwithairtube,case
GKK3500,spareneedleand40rubberfoamsticker
GOEL 370 sparesensorelement
GOG-N needle,Ø0.9mm(5pieces)
GOG-A rubberfoamsticker(40pieces)
ST-R1 deviceprotectionbag
withcut-outforprobeconnection
for add. accessories p.r.t. page 56 - 58
Calibration: 1-pointcalibration:extremely
simplequickcalibrationinatmosphericair.(press
buttontocompensateunitto20.9%).
2-pointcalibration:rstpointatatmosphericair
(20.9%),secondpointfreelyselectable
Application:
Widerangeofapplicationforyourhome,joband
hobby!Forexample:
- Bio chemistry:Oxygenmonitoringinbreeding
chambersforcellcultures.Monitoringoffermen-
tingprocessoffruitsinfermentationplantsetc.
- Medicine:Monitoringofoxygenconcentration
inrespirators;checkingofbreathing,monitoring
ofoxygenconcentrationinincubators,oxygen
tentsetc.
- Food technology:Monitoringofresidualoxygen
inpackages(e.g.coffee,tea,etc.).Monitoringof
oxygencontentduringproductionprocesses.
- Air conditioning and ventilation technology:
Oxygenmeasurements,airqualitymonitoring,
measuringofoxygenconcentrationinenclosed
airconditioningsystems,etc.
- Sport:Checkingofoxygencontentincom-
pressedairbreathingapparatuses(diving,etc.),
oxygenmonitoringforgliding.
The device can only be used to check during
these applications. -> no substitute for ap-
proved monitoring device!
Specication:
Measuring ranges:   
Oxygen concentration:  0,0...100,0% O2
            (gaseous)
Partial oxygen pressure: 0...1100hPaO2
Temperature:  -5,0...50,0°C
Accuracy:(device)(atnominaltemperature=25°C)
Oxygen concentration:  ±0.1%±1digit
Partial oxygen pressure: ±1hPa±1digit
Temperature:  ±0.1°C±1digit
Oxygen electrode: for suitable sensores
p.r.t. page 51
Sensor connection:6-pinscreenedMini-DIN-
socket.
Display: two4digitLCDs(12.4mmor7mmhigh),
aswellasadditionalarrows.
Pushbuttons:6membranekeysforON/OFF-
switch,selectionofmeas.range,min-andmax-
valuememory,hold-function,calibrationetc.
Working temperature:0to+50°C
Relative humidity: 0to+95%RH
(non-condensing)
Storage temperature: -20to+70°C
Interface: serialinterface,
directconnectiontoRS232orUSBinterfaceof
aPCviaelectricallyisolatedinterfaceconverter
GRS3100orGRS3105resp.USB3100(p.r.t.
accessories).
Power supply:9V-battery,typeIEC6F22(in-
cluded),aswellasadditionald.c.connectorfor
external10.5-12Vdirectvoltagesupply.(suitable
powersupply:GNG10/3000)
Power-Off-function:1...120min(canalsobe
deaktivated).
Power consumption: approx.1.5mA
Low battery warning:and'bAt'
Dimensions:142x71x26mm(HxWxD)
Impact-resistantABSplastichousing,membrane
keyboard,transparentpanel.FrontsideIP65,
integratedpop-upclip.
Weight:approx.160g(cpl.withbattery)
Functions:
Min-/Max-value memory:max.andmin.values
willbememorized.
Hold function:bypressingabuttonthecurrent
meas.valuewillbememorized.
Alarm:integratedlimitdetectorformin.ormax.
alarm.
Temperature compensation:automaticviatem-
peraturesensor,integratedinprobehousing.
Air pressure compensation:TheO2concen-
trationwillbecompensatedaccordingtotheabs.
atmosphericpressureset(500...2000hPa).
Accessories:
Suitable sensoresp.r.t. page 51
GKK 3000 case(275x229x83mm)
withpunchedliningsuitableforGMH3xxx
USB 3100 N interfaceconverter,
electricalisolated
GRS 3105 interfaceconverter
with5connectionpoints,electr.isolated,forthe
connectionof5GMH3xxxtoonePC(RS232).
ST-R1 deviceprotectionbag
withcut-outforprobeconnection
 for add. accessories p.r.t. pages 56 - 58