GREISINGER GODOX 200 Oxygen Converter Instruction Manual
- May 15, 2024
- GREISINGER
Table of Contents
GEISINGER GODOX 200 Oxygen Converter
General Advice
Read this document carefully and get used to the operation of the device before you use it. Keep this document within easy reach near the device for consulting in case of doubt. Mounting, start-up, operating, maintenance and removing from operation must be done by qualified, 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 this manual, operating by unqualified staff as well as unauthorized modifications to the device. The manufacturer is not liable for any costs or damages incurred by the user or third parties because of the usage or application of this device, in particular in case of improper use of the device, misuse or malfunction of the connection or the device. The manufacturer is not liable for misprints.
Intended use
The oxygen transmitter GODOX 200 is a robust measuring system for low maintenance /permanent opera-tion in water. In comparison to electrochemical sensors it operates without electrolytes, and measuring is performed with the lumi-niscence duration method. Together with the complete data calculation including automatic ambient pressure and temperature compensation, this is a hassle-free package. Measurement down to 30 m is possible. The expected lifetime of the replaceable membrane in normal operation is 2 years. The variant –PS is completely manufactured in PVC and therefore permanent seawater-proof. The instrument has to be supplied by a suitable voltage source (see specification). The output is performed with two norm signal outputs, configurable between 4-20mA or 0-5 V.
Safety signs and symbols
Warning notices are marked in this manual as shown below:
Safety Instructions
This device has been designed and tested in accordance to the safety
regulations for electronic devices. However, its trouble-free operation and
reliability cannot be guaranteed unless the standard safety measures and
special safety advice given in this manual will be adhered to when using it.
- Trouble-free operation and reliability of the device can only be guaranteed if it is not subjected to any other climatic conditions than those stated under “Specification”. Transporting the device from a cold to a warm environment condensation may fail the function. In such a case make sure the device temperature has adjusted to the ambient temperature before trying a new start-up.
- General instructions and safety regulations for electric, light and heavy current plants, including domestic safety regulations (e.g. VDE), have to be observed.
- Whenever there may be a risk whatsoever involved in running it, the device has to be switched off immediately and to be marked accordingly to avoid re-starting. Operator safety may be a risk if:
- there is visible damage to the device
- the device is not working as specified
- the device has been stored under unsuitable conditions for a long time
- In case of doubt, please return the device to the manufacturer for repair or maintenance. Do not use this product as a safety or emergency stop device 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.
Scope of Supply
- Transmitter containing sensor body and read out electronics, connected via cable
- Storage bottle
- Operating manual
Installation
Terminal assignment of cable
Loose cable ends:
Nr/Color/Description
- red Supply +
- black Supply – / GND
- green Output O2 concentration
- white Output O2 saturation
The outputs can be changed from voltage (0-5 V) to current (4-20 mA) mode via switch
Operation
General information about the oxygen measuring
Please observe the following points when measuring dissolved oxygen:
- For measuring remove the protective flask.
- A sensor may eventually have to be calibrated (See Section 5.2, Calibration).
- The temperatures of the sensor and of the liquid to be measured have to be identical (if necessary, wait till temperatures match)
- The sensor has to be submerged at least 3 cm into the liquid to be measured
Temperature Compensation / Ambient Pressure Compensation
The unit is equipped with automatic temperature compensation. The unit is
equipped with automatic ambient pressure compensation – no adjustment of
pressure or elevation is needed.
Salinity Compensation
The Optical DO converter also provides a salinity compensation switch between
fresh water and seawater. The “saturation” outputs are not affected by the
salinity compensation, only the “concentration” outputs are corrected for
compensation through the compensation factor S. O2_concentration (mg/l
compensated) = O2_concentration (mg/l, uncompensated) × S Compensation factor
S is a function of temperature and salinity. For fresh water, salinity=0 ppt,
S=1; for seawater, salinity=35 ppt, S=0.816 at 22oC.
Calibration
Location of calibration pinhole: (See „CAL“)
- Place the Optical DO probe in the 100% saturation condition and wait at least 2 minutes.
- Put a needle into the pinhole marked with “CAL” press for 3 seconds and then release.
For 1-pt calibration, 100% saturation can be created by one of the following means:
Air-Saturated Water
Continuously purge water with air using an air bubbler or some type of aerator
until the water becomes completely saturated with air (~10 min). Place the
sensor in the air-saturated water, submerse the temperature sensor into the
water and make sure the temperature, “mg/l” or “sat.%” readings become stable.
Water-Saturated Air
Alternatively, 1-point calibration can be done using water-saturated air:
Place the sensor in a calibration bottle (standard type only) with a wet
sponge, and be sure to wait for the readings to stabilize (at least 15
minutes).
Maintenance
Your Optical DO sensor includes a converter and a working probe with a preinstalled calibration bottle. Note that the converter contains a micro-SD card and the corresponding membrane cap on the probe.
Membrane Cap
Cap Cleaning
The sensor cap is a kind of plastic with functional coatings. Although fouling
of sensor cap will not affect the accuracy of testing, cleaning the sensor cap
after each use will extend the lifetime for a long run. To perform cleaning:
- Rinse the probe with distilled water thoroughly.
- Gently wipe any fouling off the cap with a tissue, to avoid any contamination on the cap surface, especially when you finish measurements in a solution having chemicals.
Cap Storage
When the Optical DO Sensor is not in use, it is highly recommended to store
the probe with its sensor cap in a moist environment. Your probe is shipped
with a calibration or soaker bottle, which can be used to keep a certain
degree of moisture for sensor cap storage
Cap Replacement
WHEN: With care of usage, the sensor cap will be working for more than two years even if minor mechanical or chemical damages occur. However, it is recommended each sensor cap should be replaced after two years or if the sensor cap is damaged or reading is shifted with time due to cracks.
HOW: To process cap replacement, first unscrew counterclockwise the old or damaged sensor cap from the probe, and make sure no tools will be applied to finish the following procedures:
- Double check the O-ring on the probe for positioning or any damages. If the O-ring is not at right position or bent, apply a little lubricant grease along the screws. If the O-ring is damaged, replace it with a new one included with the replacement sensor cap.
- Open the new sensor cap package and check the cap inside out, make sure the inside is clean and totally dry. If not, use lens wipes to dry and clean it.
- Place the new sensor cap onto the probe tip and clockwise rotate to assemble it, make sure the installation is just finger-tight otherwise sensor cap will leak once too loose, or break if too tight.
- After a new sensor cap is installed, store the sensor either in water or in the storage bottle.
- Insert the micro-SD card included with the replacement sensor cap into the micro-SD slot on the converter.
- Calibrate the new sensor cap (See Section 5.2, Calibration).
Reshipment
- 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 the 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.
Disposal instructions
The device must not be disposed in the unsorted municipal waste! Send the
device directly to us (sufficiently stamped), if it should be disposed of. We
will dispose of the device appropriately and envi-ronmentally sound.
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 the device should be certificated for its accuracy, this is not possible for dissolved oxygen measuring.
Specification
Accessories
- GSKA 200 Metal protection cap stainless steel (mechanical/bite protection)
- EM 200 Replacement membrane cap set
Supply: GNG 12/300 or NG1000