GREISINGER GOX 20 Pressure Gauge Pressure 2000 Instruction Manual

: June 17, 2024
: GREISINGER

Table of Contents

GREISINGER GOX 20 Pressure Gauge Pressure 2000
Product Information
Product Usage Instructions
FAQ
Safety
Product Specification
Oxygen measurements
Calibration in air
Specification
CONTACT
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

GREISINGER GOX 20 Pressure Gauge Pressure 2000

GREISINGER-GO-20-Pressure-Gauge-Pressure-2000-PRODUCT

Product Information

Specifications

Model: H43.0.01.6C-11
Product Name: Oximeter
Measuring Device: for dissolved oxygen in liquids

Product Usage Instructions

General Note

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.

Safety Signs and Symbols

Warnings are labelled in this document with the following signs:

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 that can provoke damage to the device or environment at non-observance.
Note: This symbol points out processes that can indirectly influence operation or provoke unforeseen reactions at non-observance.

Safety Guidelines

This device has been designed and tested by 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 is given in this manual will be adhered to when using the device.

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 the Specification. If the device is transported from a cold to a warm environment, condensation may cause a failure of the function. In such a case, make sure the device temperature has adjusted to the ambient temperature before trying a new start-up.
DANGER: 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 at 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 the device to the manufacturer for repair or maintenance.

When connecting the device to other devices, the connection has to be designed most thoroughly as internal connections in third-party devices (e.g. connection GND with protective earth) may lead to undesired voltage potentials that can lead to malfunctions or destroy the device and the connected devices.

FAQ

Q: What should I do if there is visible damage to the device?
A: If there is visible damage to the device, switch it offimmediately and contact the manufacturer for repair or maintenance.
Q: Can I use the device in different climatic conditions?
A: No, the device should only be used within the climatic conditions specified in the manual. Transporting the device from a cold to a warm environment may cause condensation and failure of the function.
Q: How should I connect the device to other devices?
A: When connecting the device to other devices, ensure that the connection is designed thoroughly. Improper connections may lead to malfunctions or damage to the device and connected devices.

General Note

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 another 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..

Safety

Intended Use

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.

Safety signs and symbols
Warnings are labelled in this document with the following signs:

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 that can provoke damage to the device or environment at non-observance.
Note! This symbol point out processes that can indirectly influence opera-tion or provoke unforeseen reactions at non-observance.

Safety guidelines

This device has been designed and tested under 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 are adhered to when using the device.

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 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.
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 the device to the manufacturer for repair or maintenance.
When connecting the device to other devices the connection has to be designed most thoroughly as internal connections in third-party devices (e.g. connection GND with protective earth) may lead to undesired voltage potentials that can lead to malfunctions or destruction of the device and the connected devices.
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.
Caution, acid! The electrode contains KOH. KOH can cause severe chemical burns! If leaking, avoid contact.
If there was contact:
- to skin: flush the contacted area with large amounts of water for several minutes.
- to clothing: remove contaminated clothing.
- to eyes: flush with large amounts of water for several minutes, and obtain medical treatment.
  After swallowing:
- give large volumes of water. DO NOT induce vomiting!
- obtain medical treatment.

Product Specification

Scope of supply
The scope of supply includes:

Device, incl. 9V-battery block
Operating Manual

Operation and maintenance advice

Battery operation: If ‘bAt’ is 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 the device above 50 °C. We recommend taking out the battery if a device is not used for a longer time.
For measuring remove the protective flask of the electrode.
Please note: the electrode measurement is sensitive against shocks! By stirring the electrode in the measured liquid be careful that the electrode does not hit the container. A vibration of the electrode affects the measured value.
Store the oxygen electrode always in water, either in the protective flask or directly in a vessel filled with dechlorinated water. For storage in the protective flask first, push the cap on the electrode second the o-ring and thereafter put the electrode in the flask and screw the cap down the flask.

Note: for measuring remove the protective flask!
If the diaphragm has dried up the electrode must be soaked in water for approx. 2 h before measuring start-up. Then a calibration can be carried out without any problems.

Oxygen measurements

Please observe the following rules when measuring dissolved oxygen

As it is subject to an ageing process the electrode needs to be calibrated at regular intervals. To do so the elec-trode has to be adjusted according to the oxygen content of the atmospheric air. We recommend that a calibration is carried out before a new measuring series is started.
The electrode temperature has to be identical to that of the liquid to be measured. This can be checked as follows: Switch the device to temperature display mode and stir the electrode in water till the temperature display shows a steady measuring value.
To obtain accurate oxygen measuring results the electrode needs to be stirred with at least 30cm/s. A sufficient flow speed is achieved by moving the electrode by hand or employing stirring hardware. The minimum required flow speed is achieved when an even quicker movement of the electrode does not result in an increased value being displayed.

How to carry out measurements

Switch on the device and set it to temperature display.
Place the electrode in the object to be measured and wait for the temperature display to become steady.
Switch over the device to oxygen measuring. Generate the flow speed required by stirring. Read-off measuring value as soon as it is steady.

Calibration in air

Each device has been tested and calibrated in our works. As mentioned above the oxygen electrode is subject to aging; we, therefore, recommend checking calibration before starting a new measuring series:

Clean the membrane with a soft cloth. Put the electrode on a table wrapped in Kleenex or a towel to protect it from draughts.
Switch over to temperature measurements and wait for the electrode to adopt the ambient temperature (approx. 15 minutes). Make sure that the electrode is not subjected to any external heat sources (e.g. lamp etc).
As soon as the temperature is steady, switch over the device to oxygen measuring and compare the oxygen concentration shown with the values given in the table below.

GREISINGER-GO-20-Pressure-Gauge-Pressure-2000-FIG-5

If the value displayed on the GOX 20 differs from the one given in the table, it may be adjusted through the „slope knob “.
If it can no longer be adapted to the values given, the oxygen electrode needs maintenance or is used up and needs to be replaced.
GOX 20 can also be calibrated in water. We, nevertheless, recommend air calibration as, without additional equip-ment, it is quite difficult to determine if the water used for calibration is oxygen saturated or not.

The oxygen electrode

The oxygen electrode is an active electrode consisting of a silver cathode and a lead anode using potassium hydroxide (KOH) as an electrolyte. In case oxygen is present it will be reduced at the silver cathode and the electrode produces an electric current. In case of no oxygen is present, no current will be produced.
Both the silver cathode and the lead anode will be used up during oxygen measuring.
The electrode ages. We, therefore, recommend regular maintenance of the electrode at monthly intervals (p.r.t. ‘Electrode maintenance’).

When is electrode maintenance required?

Unless it is used the electrode is to be stored in the protective flask filled with water or directly in a vessel filled with dechlorinated water.
Residues of bacteria, fungi or algae must be removed before measuring using a soft paper towel.
If a calibration can no longer be carried out or if the membrane is damaged the electrode needs maintenance.
With time air bubbles may accumulate underneath the membrane.
As long as they are small and do not affect the silver cathode the measurements will not be influenced. If, however, there is a large ring of air bubbles underneath the membrane covering the silver cathode, the electrode needs maintenance.

Safety advice

Attention during maintenance is required as the electrolyte is highly corrosive!
Use disposable gloves during maintenance, if available, or rinse hands thoroughly with water.

GREISINGER-GO-20-Pressure-Gauge-Pressure-2000-FIG-6

Electrode maintenance

Prepare liquid liquid-absorbing paper towel.
Remove the membrane cap and wipe off the electrolyte solution with a paper cloth.
Clean silver cathode using sandpaper (grain size 240). Do not shine the silver cathode as its surface needs to be rough so that the electrolyte can be dispersed evenly. Remove any dust from grinding.
Take out replenishing screw and top up with electrolyte till it is spilling out (e.g. using a disposable syringe). Put back replenishing screw.
Put a new membrane cap on the paper towel and fill it up with electrolytes making sure there are no air bubbles.
Put the electrode into the cap vertically from above till the thread catches. Then take up the cap with a paper towel and screw onto the electrode from underneath. The electrolyte will be displaced from the membrane head, flowing over.
Mop up excess electrolytes using a paper towel.
Turn the electrode around and check for air bubbles. If there are no air bubbles or only tiny ones the maintenance has been completed. If there are large air bubbles the process has to be repeated.

If the O-ring has been damaged, it has to be replaced.
Please note: Before its being calibrated again the electrode needs to be lying on a table for at least 3 hours.
If the electrode can no longer be calibrated although it has been properly maintained, the electrode needs to be returned to the manufacturer for a check-up and may have to be replaced.

Specification

Measuring range: Oxygen 0.0 … 20.0 mg/l O2 Temperature 0.0 … 40.0 °C
Resolution: Oxygen 0.1 mg/l O2 Temperature 0.1 °C
Accuracy (at nominal temperature) ±1digit): Oxygen ± 2 % of meas. value ± 0.2 mg/l Temperature ± 0.3 °C (ranging from 0-30°C)
Electrode: active type. electrode dia front: approx. 12mm, length: approx. 220mm (incl. anti-buckling protection), cable, approx. 2m long, permanently connected to the measuring device
Response time: 95% in 10sec., depending on temperature.
Service life: 3 years or more depending on proper maintenance
Operating pressure: max. 3 bar.
Temperature compensation: automatically via temperature sensor integrated into the electrode.
Calibration: The electrode may be calibrated quite simply in atmospheric air.
Display: 3½-digit, 13mm high LCD
Nominal temperature: 25 °C
Operating conditions: 0 to 50 °C, 0 to 95%RH (non condensing)
Storage temperature: -20 to 70 °C
Power supply: 9 V-battery, type IEC 6F22 (included)
Power consumption: max. 1mA
Low battery warning: „BAT“ will be displayed automatically at the left-hand corner of the display as soon as the battery is low .
Dimensions: 106 x 69 x 30 mm. Shock-resistant ABS housing.
Weight: approx. 250 g (CPL. with battery and probe)
EMC: The device corresponds to the essential protection ratings established in the Regulations of the Council for the Approximation of Legislation for the member countries regarding electromagnetic compatibility (2004/108/EG) additional fault: <1%

Reshipment and Disposal

Reshipment

All devices returned to the manufacturer have to be free of any residual measuring media and other hazardous substances. Measuring residuals at housing or sensors 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.

Disposal instructions

Batteries must not be disposed of in the regular domestic waste but at the designated collecting points.
The device must not be disposed of 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 appropriate and environmentally sound.