EIJKELKAMP GX-8000 User manual

M-1435E
Soil oxygen measurement system
© 2023-01
Meet the dierence
Operating instructions (Quick guide)
Royal Eijkelkamp
Nijverheidsstraat 9, 6987 EN
Giesbeek, the Netherlands
T [phone]
E [e-mail]
I royaleijkelkamp.com

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Contents
About this manual.........................................................................................................................................................................3
1. Soil oxygen measurement system .....................................................................................................................................3
1.1 Composition of the set ...................................................................................................................................................3
1.2 Installing the batteries in the GX-8000 meter ..........................................................................................................4
1.3 Attaching the oxygen probe and gas sampling hose to the GX8000 .................................................................4
1.4 LCD Display..........................................................................................................................................................................6
2. Starting and stopping the meter......................................................................................................................................... 7
3. Recording the measurements manually........................................................................................................................... 7
4. Screen reading options.......................................................................................................................................................... 7
5. Checking the soil oxygen meter set ..................................................................................................................................8
5.1.Calibration of the meter..................................................................................................................................................8
5.1.1 Fresh air calibration .............................................................................................................................................9
6. Use of the soil probe with the GX-8000 oxygen meter ..............................................................................................10
7. Maintenance of the soil probe ..........................................................................................................................................10
7.1 Air pressure ........................................................................................................................................................................11
7.2 Temperature.......................................................................................................................................................................11
8. Specifications...........................................................................................................................................................................11
Nothing in this publication may be reproduced and/or made public by means of print, photocopy, microfilm or any other means without
previous written permission from Royal Eijkelkamp. Technical data can be amended without prior notification.
Royal Eijkelkamp is not responsible for (personal) damage due to (improper) use of the product.
Royal Eijkelkamp is interested in your reactions and remarks about its products and operating instructions.

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About this manual
If the text follows a mark (as shown on the let), this means that an important instruction follows.
If the text follows a mark (as shown on the let), this means that an important warning follows
relating to danger to the user or damage to the apparatus.The user is always responsible for its own
personal protection.
Italic indicated text indicates that the text concerned appears in writing on the display(or must be
typed).
This document provides only the most important information and instructions on working with the
soil oxygen probe together with the GX-8000 oxygen meter. In addition, the user must also consult
the contents of the detailed manual. Your meter, the GX8000, is only equipped with an oxygen sensor.
1. Soil oxygen measurement system
1.1 Composition of the set
The set consists of a soil air probe (probe cone with handle and silicone hose, art. nr.: 143501), a digital soil
oxygen system type GX-8000 (art. nr.: 143515) with a gas sampling hose and a probe (see Figure 1). The accessories
of the GX-8000 meter consist of:
• A charger or 3 AA alkaline batteries 1.5V
• Shoulder strap
• Detailed manual of the GX-8000 meter
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Text
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Fig. 1 Soil oxygen measurement system

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1.2 Installing the batteries in the GX-8000 meter
The batteries (3 pieces 1.5V AA type) are installed in the battery compartment at the bottom side of the meter.
This compartment can be opened by turning the screw (1) in the lid to the let with a screwdriver. When inserting
the batteries, make sure that the polarity of the batteries is correct (see markings in the meter) and that the
lid (2) is properly closed aterwards.
1.3. Attaching the oxygen probe and gas sampling hose to the GX8000
The gas sampling hose has a connector to connect to the GX8000 meter on the inlet (GAS IN). Screw the oxygen
probe onto the other end of the gas sampling hose.
In this way, the oxygen probe can be used to carry out measurements in the open air.
Fig. 2 Installing the batteries
(2) Lid (1) Screw
Battery
polarity
marks
Fig. 3 Attaching the oxygen probe and gas sampling hose
Side of the meter with
connection (Gas in) for
probe
GX8000-probe with gas
sampling hose

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This manual only addresses the use of the meter and probe connected to a soil probe and not the
use of the meter for other purposes
Via a small piece of silicone tube, the oxygen probe of the GX8000 meter can be connected to the soil air probe
for measurements in the soil phase. Measurements can now be carried out in the soil phase. The meter contains
a motor that sucks in the air itself.
The various parts of the GX-8000 meter are shown in the next figure. Not all parts are relevant for the GX-
8000 supplied with oxygen sensor.
Pos. Name Function
1 LCD display Displays gas concentrations, alarms, etc.
2 Buzzer sound opening Emits a buzzer sound at an alarm. (Do not block it).
3 Alarm LED arrays The lamp blinks in response to an alarm.
4 Infra red communication port Used to carry out data communication with a PC in data logger mode.
5/AIR switch Keep this switch pressed to perform fresh air adjustment.
6/RESET switch When an alarm occurs, press this switch to reset the alarm.
7DISPLAY switch Press this switch to change between display modes.
8POWER/ENTER switch Turns on and o the power.
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4
3
1
2
5
6
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Fig. 4 GX-8000 meter

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1.4 LCD Display
Pos. Function
1 Parameter to be measured (oxygen)
2 Numerical display and bar display measurement result %
3 Pump driving indicator
4 Clock display
5Battery level icon
The meanings of battery level icons are as follows:
: Sucient
: Low
: Needs recharging
If the battery level is lower than the above, the inside of the battery icon starts to blink..
1 2 3
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Fig. 5 LCD Display

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2. Starting and stopping the meter
The meter is turned on by pressing and holding the POWER / ENTER button for at least 3 seconds. At that moment
the meter will give a sound signal once. The operation of the pump motor can now be heard.
During start up, the meter display will alternate several times before displaying the detection mode screen.
During the start-up procedure, the screen of the GX-8000 meter 02 briefly shows in succession the screens with:
• all symbols visible on the screen
• date and time
• voltage of the battery
• indication of the parameters to be measured for which sensors are available (in this case only 02);
• the programmed first alarm point
• the programmed second alarm point
• Identification screen
The meter always returns to detection mode ater the start-up sequence is completed. DThe meter then emits
two beeps. In detection mode, the measurements can be read. To stop the meter: Keep the POWER/ENTER
switch pressed until the power is turned o.
3. Recording the measurements manually
Up to 256 points of data can be recorded. When the number of recorded data points reaches the maximum,
recorded data will be overwritten, starting with the oldest data.
1) In the detection mode, keep the ▼/RESET switch pressed and press the ▲/AIR switch to prepare for
recording (about one second). The following screens are displayed in turn on the gas monitor.
The screen displays the memory number, date, and instantaneous value in turn. Press the ENTER switch to
execute recording. The date and the instantaneous value at the time when the ENTER switch is pressed are
recorded. If you do not want to record a value, press the DISPLAY switch to return to the detection mode. When
END is displayed, the recording is completed. In both cases, the instrument returns to detection mode.
4. Screen reading options
The GX8000 meter has several screens in addition to the (default) detection mode screen. Each time the DISPLAY
button is pressed a dierent screen is displayed. Not all screens apply when using the meter with a soil probe:
1. PEAK:
This screen displays the minimum concentrations of measured oxygen, measured from the moment the
meter was turned on.
2. Full scale display/alarm setpoint display/alarm test:
These screens show which alarm values the oxygen level meter is set to and whether the alarm is on. These
screens have no added value when used in combination with the soil gas probe.

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3. Pump On/O
Used to turn the pump o or on again without causing the display to go out. No measurement takes place.
Pressing the DISPLAY button will return the screen to the Detection screen.
4. ID Setting
Gives the identification number of the measurement.
5. Log Data scherm
Displays concentration data recorded to the manual memory.
5. Checking the soil oxygen meter set
5.1. Calibration of the meter
The oxygen measuring cell works according to an electrochemical measuring principle and lasts approximately
two years. The cell must be replaced by Royal Eijkelkamp. Indications for a deteriorated performance are:
deviations when measuring in fresh air (the oxygen value must be in the region of 20.9%) and / or unstable
values when performing measurements in a homogeneous gas.
When the meter is turned on in a well-ventilated area, the reading should be close to 20.9%. If the reading is,
for example, 21.3%, you have detected a deviation and you have calibrated the meter. The meter can easily be
adjusted to the outside air (20.9%) by following the Fresh Air calibration procedure. It is recommended to do
this daily before using the meter. 1 to 2 times per year, depending on the use, the meter can also be calibrated
or adjusted to zero% oxygen via a One point calibration procedure. The Fresh Air Calibration procedure is
explained on the next page.
Zero calibration (0% oxygen) can only be performed with a special calibration gas. See the detailed manual or
send the device to Royal Eijkelkamp for this!

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5.1.1 Fresh air calibration
Press and hold the AIR switch. The message Adj - Hold Air is displayed on
the screen.
Release the AIR switch when RELEASE is displayed on the screen. There is
no 30 second countdown for this meter with only an oxygen sensor.
When the adjustment procedure is finished, the meter returns to detection
mode
Note: In the detailed manual Air adjustment is also referred to as Zero
adjustment. This applies to some sensors, but not to the oxygen sensor. This should indicate 20.9% in outdoor air.

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6. Use of the soil probe with the GX-8000 oxygen meter
• Put the soil probe in the silicon hose of the soil probe.
• Push the soil probe straight down to the desired depth into the soil.
Do not hammer the soil probe. It is not designed for that!
• Pull the probe up five to ten centimeters so that the tip of the soil probe opens. Due to the special shape
of the tip, only air that is locally around the tip can now be sucked up.
• Insert the probe from the GX-8000 meter into the silicone tube of the soil probe and draw air up until the
meter shows a constant reading (usually ater several tens of seconds).
• Read and note the measured value.
• Turn o the device and pull the probe up straight with both hands.
• Clean the tip of the probe with a dry sti brush and check the operation of the inner pin. The device is then
ready for the next measurement.
Measurements are only possible in well air-permeable soils above the groundwater level.
7. Maintenance of the soil probe
Check whether the inner pin (see fig. 6, number 1) in
the bottom gas probe moves up and down properly. If
necessary, clean the tip (2) with a sti brush.
If this has insucient eect, you must disassemble the
probe. Tools are included for this.
Using the pipe wrench, remove the brass suction
nipple (3) in the top of the probe (simply turn it
counterclockwise).
Using the screwdriver, remove the screw with spring
washer (4) that keeps the inner pin (1) from sliding out.
Removethepen; cleanpenandsleeveandslideeverything
back together. Refit the screw and spring washer (4)
(do not use a washer as this will seal the pipe!).
Remove old PTFE tape from the suction nipple (3) and
the probe. Apply new tape and carefully screw the
nipple into the probe.
Make sure that the nipple is screwed
straight into the probe.
Check the probe for gas leakage.
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Fig. 6 Soil probe
4
1
2
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7.1 Air pressure
If the air pressure changes (mountains, mine shats), recalibrate to 20.9%.
7.2. Temperature
The oxygen measuring cell is temperature compensated. This compensation diers slightly per cell. It is
recommended that you recalibrate the meter again to 20.9% to fresh air when entering an area with a significantly
dierent temperature. The meter can be used from -20 °C to +50 °C.
At high temperatures, the life of the cell drastically decreases. Preferably store the meter in a cool place. For
example a cool box (car) or refrigerator (at home). Do not place the meter in a freezer.
8. Specifications
Item Specification
Oxygen meter
Range 0 - 25% volume (0.1 %)
Calibration Oxygen
Detection method Electrochemical sensor
Response time 90% response within 20 seconds
Sampling method Via pump in meter
Batteries 3 x AA alkaline 1.5 V batteries
Operating hours > 12 h. (continuously)
Operating temperature -20 ... +50 °C
Size (wxhxd) 154 x 81 x 127 mm
Weight apr. 900 gr
Soil probe
Volume apr. 20 cc
Handle width 285 mm
Total length of soil probe (extended tip) 907 mm
Length probe (pressed tip) 830 mm
Diameter probe 12 mm
Weight 1960 gr