As of Version 1.0 Operating Manual GMH 3695
Oxygen Meter for oxygen in gases
with integrated temperature and pressure measuring
Please keep for future reference!
WEEE-Reg.-Nr. DE 93889386
H74.0.15.6C-04
GHM Messtechnik GmbH • Standort Greisinger
Hans-Sachs-Str. 26 • D-93128 Regenstauf
+49 (0) 9402 / 9383-0 +49 (0) 9402 / 9383-33 info@greisinger.de
H74.0.15.6C-04 Operating Manual GMH 3695 page 2 of 16
Contents
1 GENERAL NOTE ...................................................................................................................................................... 2
2 DESIGNATED USE ................................................................................................................................................... 3
3 SAFETY ...................................................................................................................................................................... 3
3.1 SAFETY SIGNS AND SYMBOLS ................................................................................................................................ 3
3.2 SAFETY GUIDELINES .............................................................................................................................................. 3
4 PRODUCT DESCRIPTION ...................................................................................................................................... 4
4.1 SCOPE OF SUPPLY .................................................................................................................................................. 4
4.2 OPERATION AND MAINTENANCE ADVICE .............................................................................................................. 4
4.3 START OF OPERATION ........................................................................................................................................... 4
4.4 CONNECTIONS ....................................................................................................................................................... 5
4.5 DISPLAY ELEMENTS ............................................................................................................................................... 5
4.6 PUSHBUTTONS ....................................................................................................................................................... 5
4.7 POP-UP CLIP ........................................................................................................................................................... 6
5 CONFIGURATION ................................................................................................................................................... 7
6 OXYGEN MEASURING IN GASES- PLEASE NOTE ......................................................................................... 8
6.1 CHOICE OF SENSING ELEMENTS# .......................................................................................................................... 9
6.2 APPLICATION OF THE DIFFERENT SENSOR TYPES GGO ..., GOO ... AND GGA ..................................................... 9
7 CALIBRATION OF THE SENSOR....................................................................................................................... 10
7.1 ONE POINT CALIBRATION ('(AL 1-PT') ................................................................................................................. 10
7.2 2 / 3-POINT CALIBRATION ('(AL 2-PT, (AL 3-PT') ................................................................................................ 10
7.3 EVALUATION OF SENSOR STATE (ELE[) .............................................................................................................. 10
8 OPERATION OF THE LOGGER ......................................................................................................................... 11
8.1 „FUNC-STOR“: STORING SINGLE MEASUREMENT SETS ...................................................................................... 11
8.2 „FUNC-CYCL“: AUTOMATIC RECORDING WITH SELECTABLE LOGGER-CYCLE-TIME ..................................... 12
9 INSPECTION OF THE ACCURACY / ADJUSTMENT SERVICES ................................................................ 12
10 OUTPUT ................................................................................................................................................................ 13
10.1 INTERFACE - BASE ADDRESS ('ADR.') .............................................................................................................. 13
10.2 ANALOGUE OUTPUT – SCALING WITH DAC.0 AND DAC.1 ............................................................................ 13
11 GLP ........................................................................................................................................................................ 14
11.1 CALIBRATION INTERVAL ([.INT) ....................................................................................................................... 14
11.2 CALIBRATION STORAGE (READ CAL) ............................................................................................................. 14
12 ALARM („AL.“) ................................................................................................................................................... 14
13 REAL TIME CLOCK („CLOC“) ....................................................................................................................... 14
14 ERROR AND SYSTEM MESSAGES ................................................................................................................ 15
15 SPECIFICATION ................................................................................................................................................. 16
16 RESHIPMENT AND DISPOSAL ....................................................................................................................... 16
1 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.
If the device is stored at temperatures above 50°C the battery has to be removed from the device.
NOTE: We recommend taking out battery if device is not used for a longer period of time.
Risk of leakage!
H74.0.15.6C-04 Operating Manual GMH 3695 page 3 of 16
DANGER
Caution! This symbol warns of imminent danger, death, serious injuries
and significant damage to property at non-observance.
Attention! This symbol warns of possible dangers or dangerous
situations which can provoke damage to the device or environment at
non-observance.
Note! This symbol point out processes which can indirectly influence
operation or provoke unforeseen reactions at non-observance.
DANGER
DANGER
DANGER
2 Designated Use
The GMH 3695 is measuring oxygen in air and gas mixtures either as partial pressure or as concentration in
%vol.
For the measuring an external sensor of the type GOO-... or GGO... has to be connected to the MINI-DINsocket.
Due to the properties of the sensor, it has to be calibrated regularly (e.g. at fresh air = 20.95%) to get precise
values. If the sensor is used up, this will be detected during the calibration, the sensor has to be regenerated
or replaced before continuing with measuring.
The safety requirements (see below) have to be observed.
The device must be used only according to its intended purpose and under suitable conditions.
Use the device carefully and according to its technical data (do not throw it, strike it, …)
Protect the device from dirt.
3 Safety
3.1 Safety signs and symbols
Warnings are labeled in this document with the followings signs:
3.2 Safety guidelines
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".
If the device is transported from a cold to a warm environment condensation may cause in a failure. In
such case make sure the device temperature has adjusted to the ambient before trying a new start-up.
2. 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.
3. 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.
4. This device must not be used at potentially explosive areas! The usage of this device at
potentially explosive areas increases danger of deflagration, explosion or fire due to
sparking.
H74.0.15.6C-04 Operating Manual GMH 3695 page 4 of 16
4 Product Description
4.1 Scope of supply
The scope of supply includes:
GMH 3695 with 9V-battery
Operating manual
The necessary oxygen sensor is chosen separately due to application.
4.2 Operation and maintenance advice
1. Battery operation
If and ‘bAt’ are shown in the lower display the battery has been used up and needs to be replaced.
However, the device will 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.
The battery has to be taken out, when storing device above 50 °C.
We recommend taking out battery if device is not used for a longer period of time.
After recommissioning the real-time clock has to be set again.
2. Mains operation with power supply
When using a power supply please note that operating voltage has to be 10.5 to 12 V DC.
Do not apply overvoltage!! Cheap 12V-power supplies often have excessive no-load voltage.
We, therefore, recommend using regulated voltage power supplies.
Trouble-free operation is guaranteed by our power supply GNG10/3000.
Prior to connecting the power supply to the mains make sure that the operating voltage stated at the
power supply is identical to the mains voltage.
3. Treat device and sensor carefully. Use only in accordance with above specification. (do not throw, hit
against etc.). Protect plug and socket from soiling.
4.3 Start of Operation
Switch the device on with the key “ON OFF”. The instrument is performing a self diagnosis, during this time
all display segment are shown.
Afterwards the instrument signals, if it was user adjusted („[ORR“)
The device starts measurement afterwards.
H74.0.15.6C-04 Operating Manual GMH 3695 page 5 of 16
1.
Output: Operation as interface for t he connection of
galvanically isolated adapters (accessories: GRS
3100, USB 3100)
Operation as analogue output: connection via
suitable analogue cable
Attention: The mode of operation has to be
configured (p.r.t Chapter 5) and influences the power
consumption.
2.
Sensor connection MiniDIN
3.
Pressure Port: Tube Connection for ambient pressure compensation of oxygen Sensor
4.
Power supply: d.c. connector (internal pin Ø 1.9 mm) for external 10.5-12V direct voltage supply
1 = Main Display:
Possible displays:
Oxygen concentration in % (% O2 Vol)
Oxygen partial pressure (hPa or mmHg)
(change with -key)
2 = secondary
display:
Display of sensor temperature or absolute
pressure (alternating, please refer to Chapter
5. LcD.2)
Special elements:
3 = MIN/MAX/HLD:
Shows, if minimum/maximum/
memorized measuring value is in display
4 = ok-arrow:
Signals, if oxygen and temperature values
are stable
5 = CAL- arrow:
Signals, if automatic calibration is in
progress
6 = Logg - arrow
Shows, if logger function is chosen.
Is blinking, if cyclic logger is running
7 = Warning sign:
Signals weak battery or other warning
message
Die restlichen Pfeile haben in dieser Gerätevariante keine Funktion
On / off key
Set/Menü
Press 2 sec.: (Menu): call configuration menu
Press shortly: Change the oxygen display unit
(please refer to chapter 5)
+
min/max when taking measurements:
press shortly: min. or max. measured oxygen value and
referring temperature and pressure values
will be displayed
press for 2 sec.: the min. or max. value will be deleted
Configuration: to enter values, or change settings
Store/Enter
- Measuring:
with Auto-Hold off: hold and save current measuring value (‘HLD’ is displayed)
with Auto-Hold on: start new measuring, It is finished , when “HLD’ shows in display
or if logger activated: calling the logger functions (refer to chapter 8)
- Set/Menu: confirm settings, return to measuring
CAL:
press shortly: display of sensor state rating
press for 2 sec: start sensor calibration
4.4 Connections
4.5 Display elements
4.6 Pushbuttons
H74.0.15.6C-04 Operating Manual GMH 3695 page 6 of 16
Pop-up clip closed
Pop-up clip at position 90°
Pop-up clip at position 180°
Device attached to a belt
Device set up on a table
Device suspended from
magnetic holder
GMH 1300
4.7 Pop-up clip
Handling:
• Pull at label “open” in order to swing open the pop-up clip.
• Pull at label “open” again to swing open the pop-up clip further.
Function:
• The device with a closed pop-up clip can be plainly laid onto a table or attached to a belt, etc.
• The device with pop-up clip at position 90° can be set up on a table, etc.
• The device with pop-up clip at position 180° can be suspended from a screw or the magnetic holder
GMH 1300.
H74.0.15.6C-04 Operating Manual GMH 3695 page 7 of 16
Menu
Parameter
Value
Description
key Menu
key
key or
p.r.t
SET
(ONF
Set Configuration: General configurations
[H 2
P 02
hPa
Oxygen partial pressure display in hPa
*
P 02
mmHg
Oxygen partial pressure display in mmHg
LCD.2
T
Second. display always temperature
P
Second. display always absolute pressure
P T
Second. display alternates between temperature and abs. pressure
U N,T
T
°C
All temperatures in degree Celsius (ex works setting)
°F
All temperatures in degree Fahrenheit
[AL.P
1-PT
Simple one point calibration at air
2-PT
2 point calibration at air and 0% (e.g. N2 ) or 100 %
3-PT
2 point calibration at air and 0% (e.g. N2 ) and 100 %
[. INT
1 … 365
Calibration reminder period (in days)
OFF
No calibration reminder
A VTO
HLD
ON
Auto measuring value identification Auto Hold (when logger = off)
OFF
Standard hold function on key press (when logger = off)
P.OFF
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. (ex works setting 20min)
OFF
Automatic power-off function deactivated (continuous operation)
0V T
OFF
Interface off -> minimal power consumption
SER
Serial interface activated (ex works setting)
DA[
Analogue output activated
ADR
0 1, 1 1,2 1, … 9 1
Base address for serial interface communication (ex works setting 01)
DA.,N
[ONC
Analogue output is showing concentration in %
P. 02
Analogue output is showing partial pressure in hPa or mmHg
DA[.0
0.0...100.0
%O
2
Measuring value which should correspond to output 0 V
e.g. 0.0 % -> 0 V, (ex works 0,0 %O2)
DA[. 1
0.0...100.0
%O
2
Measuring value which should correspond to output 1 V
e.g. 100.0 % -> 1 V (ex works 100,0 %O2)
SET
(ORR
Set Corr: Input adjustment
0FFS
°C or °F
-5.0 °C .. 5.0 °C
or
-9.0 °F .. 9.0 °F
The zero point of the temperature measuring is shifted for the entered
value. This can be used to compensate sensor and instrument
deviations
OFF
No zero adjustment for temperature measurement (=0.0°)
S[AL
°C or °F
-5.00 ... 5.00 %
The slope of the temperature measurement is corrected by this value.
This can be used to compensate sensor and instrument deviations
OFF
No slope adjustment for temperature measurement (=0.00)
0FFS
hPa
-20 .. 20 hPa
The zero point of the pressure measuring is shifted for the entered value.
This can be used to compensate sensor deviations
OFF
No zero adjustment for pressure measurement (=0.0°)
1 2 3
4 5 6
ON
OFF
max
Store
CAL
min
Set
Menu Quit
1 2 3
4 5 6
ON
OFF
max
Store
CAL
min
Set
Menu Quit
CAL
CAL
max
CAL
max
Store
CAL
min
1 2 3
4 5 6
ON
OFF
max
Store
CAL
min
Set
Menu Quit
Store
CAL
5 Configuration
Some menu points depend on current device settings.
To change device settings, press „Menu“ for 2 seconds. This will activate the configuration menu (main
display: “Set”). Pressing „Menu“ changes between the menus points, pressing jumps to the
referring parameters, which can be selected with key .
The parameters can be changed with or . Pressing „Menu“ again jumps back to the main
configuration menu and saves the settings. "Store" finishes the configuration and returns to measuring.
H74.0.15.6C-04 Operating Manual GMH 3695 page 8 of 16
SET
AL
Set Alarm
AL. 1
ON / NO.SO
Monitoring Oxygen: Alarm on with buzzer / Alarm on without buzzer
OFF
No alarm monitoring for oxygen
AL.,N
[ONC
Monitoring Oxygen: Concentration in %
P. 02
Monitoring Oxygen: Partial pressure in hPa or mmHg
A 1.LO
e.g. 0.0..100.0 %
Min alarm limit oxygen (not if AL. 1. oFF)
A 1.H,
e.g. 0.0..100.0 %
Max alarm limit oxygen (not if AL. 1. oFF)
AL. 2
ON / NO.SO
Temperature monitoring : Alarm on with buzzer / Alarm on without
buzzer
OFF
No alarm monitoring for temperature
A2.LO
-5.0 ..+ 50.0 °C
Min alarm limit temperature (not if AL. 2. oFF)
A2.H,
-5.0 ..+ 50.0 °C
Max alarm limit temperature (not if AL. 2. oFF)
SET
LO66
Set Logger
FVNC
(Y(L
Cyclic logger function
*
8
STOR
Store: manual recording
OFF
No logger activated
(Y(L
0:0 1 … 60:00
Cycle time in [minutes:seconds] for cyclic logger
*
SET
(L0(
Set Clock
(L0(
HH:MM
Clock: set time hours:minutes
YEAR
YYYY
Year: set year
DATE
TT.MM
Date: set date day.month
Pressing “menu” and “store” at the same time for more than 2 seconds will reset the
device to factory defaults
If there are data sets stored and logger is set to “manual recording” (“Func Stor”) the first
menu point displayed is “rEAd Logg” (p.r.t. chapter 8)
If no key is pressed for more than 2 minutes the configuration will be aborted. All changes will
not be saved!
6 Oxygen Measuring in Gases- Please Note
The GMH 369x is designed for measuring the oxygen partial pressure or the oxygen concentration (%vol,
calculated from partial pressure and ambient pressure) in gases. Please keep in mind:
The sensor hast o calibrated regularly, e.g. at fresh ambient air
The calibration and the measuring are pressure depending!
The instrument automatically measures the ambient pressure, be sure, that instruments pressure is
The sensor consists of a sensing element (GOEL xxx) enclose in a sensor housing (GGO/ GGA/GOO).
When purchasing a Sensor GGO/GGA/GOO xxx, a sensor element is already integrated, e.g. a GGO 370:
contains housing GGO and a sensor element GOEL 370.
the same like the pressure at the sensors membrane. For the full automatic compensation a precision
pressure sensor is integrated in the instrument.
The sensor temperature has to be the same like the gas temperature!
Temperature differences may falsify the results!
Please have in mind that temperature adoption of the sensor and the air may take several hours.
A suitable ventilation or gas flow around the sensor would speed up this process significantly.
H74.0.15.6C-04 Operating Manual GMH 3695 page 9 of 16
6.1 Choice of Sensing Elements#
GOEL 370:
Universal sensor element with special protection measures especially for diving application (“Nitrox”).
Very long life time, also suitable for application with larger CO2 concentrations.
GOEL 380:
Fast responding for low oxygen concentration e.g. protection atmosphere below 1%, max 25%.
For application without larger CO2 concentration.
Sensors are not allowed to used in „under-Water-Diving-Application (e.g. Rebreather)
DANGER
6.2 Application of the different sensor types GGO ..., GOO ... and GGA
GGO (closed sensor)
For measurements at atmosphere and in systems without over or under pressure the GGO... is sufficient.
Additionally the GGO can be screwed tightly into systems with small over or under pressure.
Attention! Mind the maximum pressure and the maximum pressure difference at the membrane.
If instrument and sensor pressure are different, please connect the pressure port of instrument to measuring
pressure, otherwise it will be compensated wrong!
GOO 370 / 380 (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 measures. The temperature compensation speed of the sensor also is
optimised by this design.
Especially the measuring of gases from compressed gas bottles, where the expansion of the gas
leaving the bottle lowers the temperature, is optimised 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 connected directly to the source e.g. by means of a tube.
GGA (closed sensor with pressure port)
Especially at systems with over or under pressure or at dynamic pressure due to gas flow this type is
optimal. It can be screwed tightly into systems with small over or under pressure.
Attention! Mind the maximum pressure.
The instrument pressure port is connected directly to the sensor port. Then the actual pressure at the
membrane will be measured and compensated automatically.
H74.0.15.6C-04 Operating Manual GMH 3695 page 10 of 16
7 Calibration of the Sensor
In order to compensate for ageing of the sensor, the sensor has to be calibrated at regular intervals.
The device is equipped with a easy-to-use calibration functions.
We recommend to calibrate the sensor at least all 7 days, or to get maximum precision, before each
measuring series.
7.1 One Point Calibration ('(AL 1-PT')
The calibration adjusts the sensor to the oxygen content of the atmosphere (20.95%). Therefore simply
expose the sensor to the ambient air (sufficient ventilation in closed rooms has to be ensured)
Start calibration: press -key for 2 seconds
The display will show 'A,R , and as soon the values for oxygen and temperature are stable, the
calibration will be finished
Then the electrode state resulting of the successful calibration will be shown for a short time (evaluation in
10% steps: xx% ELE[).
7.2 2 / 3-Point Calibration ('(AL 2-PT, (AL 3-PT')
The sensor will be automatically calibrated to the oxygen content of the atmosphere (20.95%) and one or two
additional concentrations. As reference gases usually Nitrogen (0% vol O2) or pure oxygen are used
1. Start calibration: press -key for 2 seconds
2. First calibration reference: (Pt.1)
As first reference at a 3-point calibration, the zero reference has to be applied (NULL),
at a 2-point calibration either 100% or 0%(NULL).
The display will show , and the referring reference which should be applied:
- NULL for 0% oxygen
- 0.2 for pure oxygen
As long as the display blinks, no valid reference is recognised by the instrument.
As soon the values for oxygen and temperature are stable, the calibration of the first point will be finished.
The instrument tells you to apply the next reference (possible references are blinking in the display).
3. Second calibration reference: (Pt.2)
The display will show , and the referring reference which should be applied:
- A,R for ambient air
- 0.2 for pure oxygen
- NULL for 0% oxygen
As long as the display blinks, no valid reference is recognised by the instrument.
As soon the values for oxygen and temperature are stable, the calibration of the second point will be
finished. At 2-point calibration the calibration will be finished and the electrode state resulting of the
successful calibration will be shown for a short time (evaluation in 10% steps: xx% ELE[).
At 3-point calibration the instrument tells you to apply the next reference (possible reference is blinking)
4. Third calibration reference: (Pt.3)
The display will show , and the referring reference which should be applied:
As soon the values for oxygen and temperature are stable, the calibration of the second point will be
finished. At 2-point calibration the calibration will be finished and the sensor state resulting of the successful
calibration will be shown for a short time (evaluation in 10% steps: xx% ELE[).
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 is unstable (oxygen partial pressure, temperature).
Please check your measuring arrangements!
7.3 Evaluation of Sensor State (ELE[)
Watch sensor state: press key "CAL" shortly once display show for a short time xx% ELE[.
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 may be the cause of low valuation values.
H74.0.15.6C-04 Operating Manual GMH 3695 page 11 of 16
Clear all
recordings
Clear the last
recording
Clear nothing
(cancel menu)
8 Operation of the Logger
The device supports two different logger functions:
„Func-Stor“: each time when „store“ (key 6) is pressed a measurement will be recorded.
„Func-CYCL“: measurements will automatically be recorded at each interval, which was set in the logger
menu ‚CYCL‘ until the logger will be stopped or the logger memory is full.
The recording is started by pressing „Store“ 2 seconds.
For the evaluation of the data the software GSOFT3050 (V3.5 or higher) has to be used. The software also
allows easy configuration and starting of the logger.
When the logger is activated (Func Stor or Func CYCL) the hold and auto hold functions are no longer
available, key 6 is solely used for the operation of the logger functions.
8.1 „Func-Stor“: Storing Single Measurement Sets
Each time when „store“ (key 6) is pressed a measurement and its time stamp will be recorded.
The recorded data can be viewed either in the display (when calling the configuration an additional menu
„REAd LoGG“ is displayed, see below) or by means of the interface and a PC with GSOFT3050-software.
The logger stores the current measuring, independent from the stability of the value.
Max. number of data sets: 1000
A data set contains: - oxygen concentration % Vol
- oxygen partial pressure in hPa or mmHg
- temperature value at the time of recording in °C or °F
- absolute pressure in hPa abs or mmHg abs
- time and date of the recording
After each recording „St. XX“ will be displayed for a short time. XX represents the number of the recording.
Input of the measuring point “L-Id”: Selection of measuring point via keys or .
Number 0…19999 or text assigned to number 1…40
(comfortable assignment of texts can be done with gratis software GMHKonfig)
Confirm input with „store“.
When logger memory contains recordings already:
When „Store“ is pressed for 2 seconds, the choice for clearing the logger memory will be displayed:
The selection can be made by (key 2) and (key 5). "Quit" (key 6) enters the choice.
If the logger memory is full, the display will show:
Viewing Recorded Data
Within the „LoGG Stor“ function the logger data can be viewed directly in the display not only by means of a
computer (like at „Func CYCL“): press 2 seconds „Set“ (key 4): The first menu displayed now is „rEAd LoGG“
(read logger data). After pressing (key 3) the measurement recorded last will be displayed, changing
between the different data referring to the measurement also is done by pressing .
Changing the measurement is done by pressing the keys or .
H74.0.15.6C-04 Operating Manual GMH 3695 page 12 of 16
Stop the
recording
Do not stop the
recording
Clear all
recordings
Clear nothing
(cancel menu)
8.2 „Func-CYCL“: Automatic Recording With Selectable Logger-Cycle-Time
The Logger-Cycle-Time is selectable (p.r.t. Configuration). For example „CYCL“ = 1:00: A measuring is
recorded after each 60 seconds.
Max. number of data sets: 8000
Cycle time: 0:01...60:00 (minutes:seconds, min 1s, max 1h), selectable in the configuration
A data set contains: - oxygen concentration % Vol
- oxygen partial pressure in hPa or mmHg
- temperature value at the time of recording in °C or °F
- absolute pressure in hPa abs or mmHg abs
Recording time: > 20 days with fresh battery (with output activated: OUT = SEr)
With mains adapter: limited just by memory and cycle time, up to 333 days
Starting a recording:
By pressing "Store" (key 6) for 2 seconds the recording will be initiated. After that the display shows
‘St.XXXX‘ for a short time whenever a measuring is recorded. XXXXX is the number of the measuring
1..9999.
If the logger memory is full, the display will show:
Stopping the recording manually:
By pressing "Store" (key 6) the recording can be stopped manually. Then the following choice appears:
The selection can be made by (key 2) and (key 5). "Quit" (key 6) enters the choice.
If you try to switch off the instrument in the cyclic recording operation You will be asked
once again if the recording should be stopped.
The device can only be switched off after the recording has been stopped!
The Auto-Power-Off-function is deactivated during recording!
Clear Recordings:
When “Store“ is pressed for 2 seconds, the choice for clearing the logger memory will be displayed:
The selection can be made by (key 2) and (key 5). "Quit" (key 6) enters the choice.
The recording automatically will be stopped.
9 Inspection of the accuracy / Adjustment Services
The instrument can be sent to the manufacturer for adjustment and function test.
Only the manufacturer can check all systems on correct them if necessary.
Calibration certificates – DKD-certificates – other certificates:
If device should be certificated for its accuracy, it is the best solution to return it to the manufacturer.
(please specify references, e.g. 20.9 and 100%).
If the instrument is certified with its sensor, this proves for example the linearity of the measuring chain,
regular recalibration by the user is still necessary!
H74.0.15.6C-04 Operating Manual GMH 3695 page 13 of 16
1 2 3 4 Code
Name/Function
1 2 3 4 Code
Name/Function
x x x x 0
read nominal value
x x x x 199
read measuring type in display
x x x x 3
read system status
x x x x 200
read min. display range
x 12
read ID-no.
x x x x 201
read max. display range
x x x 22
read min alarm limit
x x x x 202
read unit of display
x x x 23
read max alarm limit
x x x x 204
read decimal point of display
x x x x 176
read min measuring range
x 208
read channel count
x x x x 177
read max measuring range
x 222
read turn-off-delay
x x x x 178
read measuring range unit
x 223
Set turn-off-delay
x x x x 179
read measuring range decimal point
x 240
Reset
x x x x 180
read measuring type
x 254
read program identification
Plug wiring:
GND
The 3
rd
contact has to be left floating!
Only stereo plugs are allowed!
+Uout
10 Output
The output can be used as serial interface (for GRS3100 or GRS3105 interface adapters) or as analogue
output (0-1V). If none of both is needed, we suggest to switch the output off, battery life then is extended.
10.1 Interface - Base Address ('Adr.')
By using an electrically isolated interface converter USB3100, GRS3100 or GRS3105 (accessory) the device
can be connected to a PC.
With the GRS3105 it is possible to connect up to 5 instruments of the GMH3000 family to a single interface
(please also refer to GRS3105-manual). As a precondition the base addresses of all devices must not be
identical, make sure to configure the base addresses accordingly (refer menu point “Adr.” in chapter 5).
In order to avoid transmission errors, there are several security checks implemented (e.g. CRC).
The following standard software packages are available for data transfer:
GSOFT3050: Operating and evaluation software for instruments with integrated logger function
EBS20M/ -60M: 20- / 60-channel software to record and display the measuring values
GMHKonfig: Software for a comfortable configuration of the device (e.g. freeware)
In case you want to develop your own software we offer a GMH3000-development package including
- an universally applicable 32bit Windows functions library ('GMH3000.DLL') with documentation that can
be used by all 'serious' programming languages.
- Programming examples for Visual Studio 2010 (C#, C++), Visual Basic 6.0™, Delphi 1.0™, Testpoint™,
Labview™
The Device has 4 Channels:
- oxygen concentration % Vol
- oxygen partial pressure in hPa or mmHg
- temperature value at the time of recording in °C or °F
- absolute pressure in hPa abs or mmHg abs
Supported Interface-functions:
The measuring and range values read via interface are always in the selected display
unit!
10.2 Analogue Output – Scaling with DAC.0 and DAC.1
With the DAC.0 and DAC.1 values the output can be rapidly scaled to Your efforts.
Keep in mind not to connect low-resistive loads to the output, otherwise the output value will be wrong and
battery life is decreased. Loads above ca 10kOhm are uncritical.
If the display exceeds the value set by DAC.1, then the device will apply 1V to the output
If the display falls below the value set by DAC.0, then the device will apply 0V to the output
In case of an error (Err.1, Err.2, no sensor, etc.) the device will apply slightly above 1V to the output.
H74.0.15.6C-04 Operating Manual GMH 3695 page 14 of 16
Press for 2 seconds
The display will show:
or (configuration level)
Press several times until this is
displayed:
read cal. = “read calibration data”
Press shortly: switch between
- ELE[ = total electrode state evaluation in %
- SL. 1 = Slope at 0% ... air *1)
- SL. 2 = Slope at air ... 100% *1)
- Date + time display of data set
or
Change between the different calibration data sets
Abort calibration storage display
1 2 3
4 5 6
ON
OFF
max
Store
CAL
min
Set
Menu Quit
1 2 3
4 5 6
ON
OFF
max
Store
CAL
min
Set
Menu Quit
CAL
max
CAL
max
Store
CAL
min
11 GLP
GLP (Good Laboratory Practice) includes regular check of devices and accessories. For oxygen
measurements it is highly important to ensure correct pH calibration. The device provides the following
functions to help with this.
The usage of the GLP functions is only reasonable if the sensor is not changed. Although all data is stored in
the device, it refers to the particular sensor.
11.1 Calibration interval ([.INT)
You can enter the interval after which the device reminds you to recalibrate in the configuration.
The interval times should be chosen according to the application and the stability of the sensor.
“CAL” flashes on the display as soon as the interval has expired.
11.2 Calibration storage (rEAd CAL)
The last calibrations are stored with results and date and can be read out.
Display calibration data:
Historical calibration data can be comfortably read out via PC software GMHKonfig and GSOFT3050 or
displayed directly at the device:
*1at 1 and 2-point calibration is SL.1 = SL. 2
at 3-point calibration there are different slopes for the referring range segments.
12 Alarm („AL.“)
There are three possible settings:
Alarm off (AL. oFF), on with buzzer (AL. on), on without buzzer (AL. no.So).
Following conditions will display an alarm, when the function is activated (on or no.So):
- Value is below lower (AL. Lo) or above upper alarm rail (AL.Hi).
- Sensor error
- Low battery (bAt)
- Err.7: System error (always with buzzer)
In case of an alarm and when polling the interface the “prio”-flag is set in the returned message.
13 Real Time Clock („CLOC“)
The real time clock is used for the logger and GLP functions: Recorded values are also containing the point
of time, when they were measured. Please check the settings when necessary.
If the battery was replaced the referring menu ‚CLOC‘ will automatically be started
H74.0.15.6C-04 Operating Manual GMH 3695 page 15 of 16
Display
Meaning
Remedy
low battery voltage, device will continue to work
for a short time
replace battery
If mains operation: wrong voltage
replace power supply, if fault continues to
exist: device damaged
low battery voltage
replace battery
If mains operation: wrong voltage
Check/replace power supply, if fault
continues to exist: device damaged
No display
or
weird display
Device does not
react on keys
low battery voltage
replace battery
If mains operation: wrong voltage
check/replace power supply, if fault
continues to exist: device damaged
system error
disconnect battery or power supply, wait
some time, re-connect
device defective
return to manufacturer for repair
SENS
ERRO
sensor error: no sensor cable connected
connect suitable sensor
Sensor, cable or instrument defect
return to manufacturer for repair
ERR.1
Value exceeding measuring range
Check: Is the value exceeding the
measuring range specified? ->value too
high!
Wrong sensor connected
Check sensor
Sensor, cable or instrument defect
return to manufacturer for repair
ERR.2
Value below display range
Check: Is the value below the measuring
range specified? ->value too low!
Wrong sensor connected
Check sensor
Sensor, cable or instrument defect
return to manufacturer for repair
ERR.7
system error
return to manufacturer for repair
>CAL<
CAL flashing in
display
either preset calibration interval has expired or
last calibration is not valid
device has to be calibrated!
[AL ERR.1
wrong reference point at air
check sensor and reference gas
[AL ERR.2
slope too low
reference gas wrong
check sensor and reference gas
sensor element is defect
replace sensor element
[AL ERR.3
slope too high
reference gas wrong
check sensor and reference gas
sensor element is defect
replace sensor element
[AL ERR.4
incorrect calibration temperature
calibration can only be done at 0…50 °C
[AL ERR.5
Zero value to low/negative
sensor element is defect
replace sensor element
[AL ERR.6
zero value to high
reference gas wrong
check sensor and reference gas
sensor element is defect
replace sensor element
[AL ERR.7
incorrect calibration pressure
check calibration pressure
[AL ERR.8
signal not stable / timeout
check sensor and reference gas
[AL ERR.9
sensor not known: cannot be calibrated
check sensor and wiring
14 Error and System Messages
If “BAT“ is flashing, the battery will be exhausted soon. Further measurements are possible for short time.
If “BAT“ is displayed continuously the battery is ultimately exhausted and has to be replaced. Further
measurements aren’t possible any more.
Messages During Calibration/Adjustment
H74.0.15.6C-04 Operating Manual GMH 3695 page 16 of 16
Measuring ranges
Oxygen concentration
0.0 ... 100.0 % O2 (Vol)
electrochemical sensors GGO / GOO / GGA
Oxygen partial pressure
0 ... 1100 hPa O2
“ “ “
Sensor temperature
-5.0 ... + 50.0 °C
NTC 10k (integr. in GGO / GOO / GGA cable)
Absolute pressure
300 ... 5000 hPa abs.*)
integrated pressure sensor with pressure port
Accuracy
(instrument without
sensor, at 25°C, 1000
hPa abs)
Oxygen concentration
±0.1 % O2 (Vol)
Oxygen partial pressure
± 1 hPa
Sensor temperature
± 0.1 °C
Accuracy
Absolute pressure
3 hPa or 0.1% of measured value (the higher one to be applied)
Working conditions
-20 ... 50 °C; 0 ... 95 % r.H. (not condensing)
Nom. temperature
25°C
Storage temp.
-20 ... 70 °C
Connections
O2 & temperature
6 pole Mini-DIN Socket
Absolute pressure
Universal pressure port for tubes with 4 or 6mm inner-Ø
Interface /
Analogue output
serial, (3.5mm audio plug),via isolated adapter GRS3100, GRS3105 or
USB3100 (accessories) for PC-USB or RS232- connection, alternatively
selectable: Analogue output 0-1V
external supply
d.c. connector (diameter of internal pin 1.9 mm) for external 10.5-12V
direct voltage supply. (suitable power supply: GNG10/3000)
Display
4 digit 7-segment 2 lines, additional segments
Calibration
automatic
1 -, 2- or 3-point calibration,
0%, 100% or ambient air (20.95%)
GLP
calibration storage
adjustable calibration intervals (1 to 365 days, CAL warning after
expiration)
Data logger
Real-time clock
Cyclic: 8000 data sets, cycle time 1s to 60 minutes
Single: 1000 data sets, with measuring point input
Alarm
Buzzer / visual / interface
2 channels: selectable oxygen unit and temperature
Additional functions
Min / max / hold / auto hold
Housing
Break-proof ABS housing
Protection class
Front side IP65
Dimensions L*B*H [mm]
Weight
Without pressure port: 142 x 71 x 26 mm (L x B x H)
Pressure port at instruments top: ca. 11 mm,
approx. 175 g (incl. battery)
Power supply
Current consumption
9V-Battery, Type IEC 6F22 (in scope of supply) or external supply
Ca. 0.6 mA (if Out = Off ca. 0.4mA)
Change battery indicator
Automatic at weak battery and ’ bAt ’
Auto-Off-Function
Device will be automatically switched off if no key is pressed/no
interface communication 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.
EMI
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). Additional fault: <1%
Dispense exhausted batteries at destined gathering places.
This device must not be disposed as “residual waste”. To dispose this device, please send it
directly to us (adequately stamped). We will dispose it appropriately and environmentally friendly.
DANGER
All devices returned to the manufacturer have to be free of any residual of measuring media and
other hazardous substances. Measuring residuals at housing or sensor may be a risk for persons
or environment
Use an adequate transport package for reshipment, especially for fully functional devices. Please
make sure that the device is protected in the package by enough packing materials.
15 Specification
*) please note: maximum pressure of the oxygen sensor
16 Reshipment and Disposal
Loading...