GHM GOEL 370 Technical document

Z11.0.1X.6C-20
GHM GROUP - Greisinger
GHM Messtechnik GmbH | Hans-Sachs-Str. 26 | 93128 Regenstauf | GERMANY
Tel.: [phone] | [email protected] | www.greisinger.de
Mounting and Operating Manual
Atmospheric Oxygen Sensor Element
GOEL 370, GOEL 381

Please read these instructions
carefully before use!
WEEE-Reg.-Nr. DE 93889386

Please consider the safety instructions!

Please keep for future reference!

Z11.0.1X.6C-20 Mounting and operating manual GOEL - page 2 of 8
Contents
1. SAFETY ....................................................................................................................................................... 2
1.1. General note............................................................................................................................................ 2
1.2. Intended use............................................................................................................................................ 2
1.3. Skilled personnel..................................................................................................................................... 2
1.4. Safety signs and symbols........................................................................................................................ 3
1.5. Safety guidelines..................................................................................................................................... 3
2. PRODUCT DESCRIPTION....................................................................................................................... 4
2.1. Scope of supply....................................................................................................................................... 4
2.2. General information about application areas.......................................................................................... 4
2.3. General information about the oxygen sensors....................................................................................... 5
3. MOUNTING................................................................................................................................................ 6
3.1. GGO/GGA/GOO/GOG sensor housings................................................................................................ 6
3.2. GOX 100 sensor housing........................................................................................................................ 6
3.3. G 1690 Sensor sleeve.............................................................................................................................. 7
4. DECOMMISSIONING, RESHIPMENT AND DISPOSAL.................................................................... 7
4.1. Decommissioning ................................................................................................................................... 7
4.2. Reshipment and disposal......................................................................................................................... 7
5. SPECIFICATION ....................................................................................................................................... 8
1. Safety
1.1. General note
Read this document carefully and get used to the operation of the product before you use it.
Keep this document within easy reach near the product for consulting in case of doubt.
Mounting, start-up, operating, maintenance and removing from operation must be done by quali-
fied, specially trained staff that have carefully read and understood this manual before starting any
work.
The manufacturer will assume no liability or warranty in case of usage for other purpose than the
intended one, ignoring advices of this manual, operating by unqualified staff as well as unauthor-
ized modifications to the product.
1.2. Intended use
The sensor elements are suitable for the measuring of gaseous oxygen, in conjunction with appro-
priate devices (hand-helds, transducers).
Dependent on the application, a suitable sensor-element must be chosen.
See also the specification at the end of the document.
For the use in practice, the sensor element must be mounted in an applicable housing.
Personnel which starts up, operates and maintains the device has to have sufficient knowledge of
the measuring procedure and the meaning of the resulting measured values, this manual delivers a
valuable help for this. The instructions of the manual have to be understood, regarded and fol-
lowed.
To be sure that there´s no risk arising due to misinterpretation of measured values, the operator
must have further knowledge in case of doubt - the user is liable for any harm/damage resulting
from misinterpretation due to insufficient knowledge.
1.3. Skilled personnel
Users of the readily installed product have to be sufficiently skilled in the operation of the product
and able to avoid risks. The operator of the arrangement is responsible for sufficient qualification
the operators.

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1.4. Safety signs and symbols
Warnings are labelled in this document with the followings signs:
Caution!
This symbol warns of imminent danger, which can result in death, severe bod-
ily injury, or severe property damage in case of non-observance
Attention!
This symbol warns of potential dangers or harmful situations, which can cause
dam-age to the device or to the environment in case of non-observance
Note!
This symbol point out processes which can indirectly influence operation, pos-
sibly cause incorrect measurement or provoke unforeseen reactions at non-
observance.
Caution, acid!
This symbol warns of danger to living tissue and many materials, that can be
damaged or destroy by exposure to that chemical.
1.5. Safety guidelines
The fault-free function and operational safety of the product can only be guaranteed if applicable
safety precautions and the device-specific safety instructions for this document are observed.
If these notices are disregarded, personal injury or death, as well as property damage can occur.
1.
Faultless operation and reliability in operation of the measuring device can only be assured if
the device is used within the climatic conditions specified in the chapter “Specifications“.
2.
The product must not be used for diagnostic or other medical purposes on pa-
tients!
3.
The product is not suitable for use in explosion-prone areas!
4.
Do not use in safety / emergency stop devices!
Not suitable for use with requirements on functional safety, e.g. SIL!
5.
The product is not suitable for underwater use (rebreather)!
6.
The sensor contains KOH (GOEL 381) or acid (GOEL 370).
KOH and acid can cause severe chemical burns!
In case of leaking liquid, avoid contact at all costs!
In case of contact:
• with skin: wash off immediately with plenty of water for several minutes.
• with clothing: remove contaminated, soaked clothing immediately.
• with eyes: rinse under running water for several minutes, consult a doctor.
If swallowed:
• drink plenty of water immediately, DO NOT induce vomiting!
• consult a doctor.

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2. Product description
2.1. Scope of supply
Oxygen sensor
mounting and operating manual
2.2. General information about application areas
GOEL 370 (acidic electrolyte): Especially long life time of > 3 Years in Air.
Suitable sensor for diving application e.g. measuring Nitrox, recommended for the range of
0.2 … 35 vol.-% O2.
Also suitable to measure oxygen-concentration in air or other gases with a high CO2-content or
even in a CO2-atmosphere. The acid electrolyte guarantees that the sensor could not be influenced
by CO2
GOEL 381 (basic electrolyte): Sensor for low oxygen concentration near 0.0 and up to 100 vol.-%
O2. Especially for diving gases above 35 vol.-% O2the best choice.
For application without larger CO2concentration *)
*)
The GOEL 381 is designed to measure oxygen-concentration in air or other gases with-
out larger CO2concentration. Higher CO2-concentration reduces the life-time of the
sensor.
Short-time exposition of up to 10% CO2(for example 15 minutes. up to 10 times per
day) is not problematic for the Sensor (e.g. exhaust measuring, protection gases
with handhelds). If there is measured more often with elevated CO2-concentration or
at CO2-concentrations above 10%, the exposition time has to be kept as short as
possible and sufficient measuring breaks should be made
If the sensor is not exposed to free air during measuring pauses, the connected
tubes etc. have to be flushed with clean air or nitrogen.

Z11.0.1X.6C-20 Mounting and operating manual GOEL - page 5 of 8
2.3. General information about the oxygen sensors
Lifetime: At the end of life time the sensor signal drops relatively fast.
The electrode evaluation in % therefore just can be used for orientation. An evalua-
tion of 70% does not mean that 70% of life time are remaining, but 70% of the refer-
ence signal are available, which happens normally at the end of life time
The nominal life time can be shortened significantly by usage. Influencing factors are:
- Storage- / Operation temperature
- Humidity of measured gas: If permanently used with dry gases (technical gases, bot-
tled gas) the life time decreases considerably.
The electrode evaluation is updated by the instrument every time, when the calibra-
tion of the sensor was performed successfully. (please also see the referring manual of the
instrument)
Operating position: The optimum operation position is with the sensor inlet pointing down-
wards, maximum differential pressure to ambient is 250 mbar.
Measuring precision: The measuring precision can be influenced by:
- Liquids at the sensor inlet. Rinse the inlet and dry with lint-free cloth.
Attention: avoid liquids of any kind at the contacts
- Gas and sensor temperature have to be at same level. Best precision, when
calibrated at measuring temperature.
- Pressure fluctuations: The sensor is originally a partial pressure sensor, i.e.
changes in the absolute pressure are influencing the measuring result di-
rectly proportional. A pressure change of 1% will cause a additional meas-
uring error of 1%!
For optimum precision calibrate at the same conditions at which You want
to measure.

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3. Mounting
3.1. GGO/GGA/GOO/GOG sensor housings
The sensor housings are consisting of two halves (1) and (4) and can be opened by screwing up:
GGO/GGA housing
GOO housing
GOG / ResOx 5695 housing
Changeable part is the sensor element (3). Important when reassembling:
- First screw in sensor (3) in part (1). Do not forget O-Ring (2)
Unscrew the sensor carefully e.g. by means of suitable nippers.
- The audio plug of part (4) has to be connected to the socket in the sensor. If this makes prob-
lems, the cable gland (5) can be opened so that the cable can be shifted further into part (4),
until the plug can be connected.
- After that screw together (1) and (4) tightly, if necessary retighten the cable gland (5).
Attention:
do not use force! Case can be destroyed by this!
3.2. GOX 100 sensor housing
1
Screw cap
2
Flat sealing
3
O-Ring (not used)
4
Sensor element
5
Case
disconnect the sensor connector
open screw cap 1, remove flat sealing 2
remove the sensor 4 from case 5
take new sensor element from packing
remove O-ring from new sensor (not needed)
Place new sensor in case, place the flat sealing
Close screw cap, reconnect

Z11.0.1X.6C-20 Mounting and operating manual GOEL - page 7 of 8
3.3. G 1690 Sensor sleeve
1
Sensor
2
Sensor cable
3
Sensor protection cap
Pull the sensor with the connected sensor cable out of the sensor protection cap.
Disconnect the used sensor and dispose it properly.
Open the tin can with the new sensor.
Remove the sensor from the tin can.
Connect the sensor to the plug of the sensor cable.
Then push the connected sensor into the sensor protection cap.
Risk of injury!
The lid of the opened tin can is sharp-edged!
Disconnecting the T-piece and pulling the flow diverter makes it easier to grip the
sensor.
If the sensor gets wet or falls into water, the sensor should be pulled out of the pro-
tective sensor cover to dry. Measurement can only be resumed after drying.
4. Decommissioning, reshipment and disposal
4.1. Decommissioning
Please also make sure that connected Loads are disconnected also and are in a safe state.
4.2. Reshipment and disposal
All products returned to the manufacturer have to be free of any residual of measur-
ing 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
products. Please make sure that the product is protected in the package by enough
packing materials.
Add the completed reshipment formula of the GHM website.
The sensor must not be disposed in the unsorted municipal waste! Send the sensor
directly to us (sufficiently stamped), considering the above if it should be disposed.
We will dispose the device appropriate and environmentally sound.

Z11.0.1X.6C-20 Mounting and operating manual GOEL - page 8 of 8
5. Specification
(All specification basis on environment of 25°C, 50 %RH and 1013 hPa)
Sensor
GOEL 381
GOEL 370
(Rev 2)
application
Diving gas *1)
precise measuring at low O2 (e.g.
<0.5 vol.-% O2) or concentrations
above 35 vol.-% O2
Diving gas *1)
Protection gases with CO2con-
centrations and O2concentra-
tions below < 35 vol.-% O2
Permanent operation with high CO2-
concentrations
-
+++
Short time exposition to CO2*2)
+
+++
Use up to 100 vol.-% O2
+++
-
Use below 0.2 vol.-% O2
+++
+
Speed /t90
++ / <10s
++ / <10s
Lifetime
hours per vol.-% O2, / at air
+
/500 000 %h/ >2 years
++
/1 200 000 %h/ max. 6 years
Diving gas application *1)
+++
+++
Meas. ranges
O2partial pressure
0 ... 1100 hPa
0 ... 350 hPa
O2concentration
0.0 ... 100.0 vol. % O2
0.0 … 35.0 vol. % O2
(lower accuracy above)
Accuracy:
< 35 vol. % O2
±0.25 vol. % O2
-0.2 … +0.35 vol. % O2
35 - 100 vol. % O2
±2.0% * (value –20.9 vol. % O2)
not specified
Electrolyte:
basic
acidic
Storage temperature:
-15 to +60 °C
Operating ambient
0 … +45 °C
Ambient pressure:
0.6 … 1.75 bar abs.
Over-/under pressure:
max. 0.25 bar
(pressure difference sensor membrane to ambient –sensor screwed-in)
Material in contact media
PA, PPS, PTFE, stainless steel
ABS, PPS, PTFE, stainless steel,
NBR
Cross sensitive
No to He, H2und CO
<20 ppm O2response to
100 vol.-% CO ,
100 vol.-% CO2
100 vol.-% C3H8
1000 ppm Benzene balance N2
3000 ppm NO2balance to N2
1000 ppm H2balance to N2
2000 ppm H2S balance to N2
1000 ppm SO2balance to N2
Sensor signal:
(at dry air, 1013 hPa, 25°C)
8.0 … 12.0 mV
9.0 … 14.0 mV
Weight
26 g
22 g
Dimension
approx. Ø 30 x 44 mm Housing with M16 x 1-screw thread
(sensor can be connected to line tubes by means of an additional adapter)
Directives, standards:
The product conform to the following Directives of the Council for the har-
monisation of legal regulations of the Member States
2011/65/EU, incl. 2015/863 RoHS 2 and RoHS 3
Applied harmonised standards:
EN IEC 63000:2018
*1) Sensors are not allowed to use in „under-water-diving-application” (e.g. Rebreather)
*2) please refer chapter 2.2