H66.0.01.6C-00 Operating Manual GLF100 page 1
Operating Manual
Conductivity measuring instrument
GLF 100 as of Version 0.3
CONTENTS
1 IN GENERAL............................................................................................................................................................................ 2
1.1 S
1.2 O
1.3 D
1.4 D
1.5 P
2 GENERAL INFORMATION ABOUT CONDUCTIVITY MEASURING ......................................................................... 3
2.1 T
2.2 M
2.3 T
2.4 M
2.5 H
3 CONFIGURATION OF THE INSTRUMENT ...................................................................................................................... 4
4 ADJUSTING OF THE INSTRUMENT .................................................................................................................................. 5
5 SYSTEM MESSAGES.............................................................................................................................................................. 5
6 INSPECTION OF THE ACCURACY / ADJUSTMENT SERVICES ................................................................................. 5
7 SPECIFICATION ..................................................................................................................................................................... 6
precise measurements of conductivity and
TDS(total dissolved solids) and Salinity
AFETY INSTRUCTIONS......................................................................................................................................................... 2
PERATING AND MAINTENANCE.......................................................................................................................................... 2
ISPOSAL NOTICE ................................................................................................................................................................ 2
ISPLAY ELEMENTS ............................................................................................................................................................. 2
USHBUTTONS...................................................................................................................................................................... 2
HE CONDUCTIVITY MEASURING CELL................................................................................................................................3
EASURING HINTS ............................................................................................................................................................... 3
EMPERATURE COMPENSATION ........................................................................................................................................... 3
IN-/MAX- VALUE MEMORY ................................................................................................................................................ 3
OLD – FUNCTION................................................................................................................................................................ 3
Applications
• Sweet and seawater aquaristics
• Fish farming
• Drinking water monitoring
etc.
H66.0.01.6C-00 Operating Manual GLF100 page 2
1 In General
1.1 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 advises given in this manual will be adhered to when using it.
1. 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”.
2. Transporting the device from a cold to a warm environment condensation may result in 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.
3. The circuitry has to be designed most carefully if the device should be connected to other devices. Internal
connection in third party devices (e.g. connection GND and earth) may result in not-permissible voltages impairing
or destroying the device or another device connected.
4. 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 or 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.
5. Warning: Do not use these product as 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.
1.2 Operating And Maintenance
• If the symbol "LO BAT” is displayed at the left side of display, the battery is weak, measuring can be continued for
a short period. If “bAt” is displayed in the main display the battery is used up and needs to be replaced. Measuring
is no more possible.
• The battery has to be removed, when storing device above 50°C.
Hint: We recommend removing the battery if device is not used for a longer period of time! Risk of Leakage
• Treat device and probes carefully. Use only in accordance with above specification. (do not throw, hit against etc.).
Protect from soiling, especially around the needles.
• After switching on the instrument a segment test (all segments) is displayed, followed by the measuring unit and, if
activated, the auto power off function (please refer to configuration)
1.3 Disposal Notice
• Dispense exhausted batteries at destined gathering places.
• Send the device directly to us, if it should be disposed. We will dispose the device appropriate and non-polluting.
1.4 Display Elements
1. BAT
2. measurement
display
3. unit arrows
4. nLF
5. HLD
Indicates low battery
consider additional arrows and symbols in
display!
TDS-measurement in mg/l or conductivity
measurement in µS/cm or mS/cm or Salinity
Non linear temperature compensation is active
Measure value is ‘frozen‘ (Key 3)
1.5 Pushbuttons
key 1: On/Off key
Press long: off;
Press short: Show temperature
key 2: mode
Choose between measuring value / min value / max value
press 2s: reset min and max value
Key 3: hold: Hold current measuring value ('HLD' in display)
H66.0.01.6C-00 Operating Manual GLF100 page 3
2 General Information About Conductivity Measuring
2.1 The Conductivity Measuring Cell
During the measurement, the conductivity measuring cell must be dipped at least in so far, that at least 30mm
beginning from the top of the measuring cell, is located in the medium.
The maximum immersion depth for continuous operation should not exceed 110mm.
The measuring cell can either be stored dry or in water. After dry storage wetting time will be prolonged slightly. If
changing over from one liquid to another with conductivities varying widely make sure to properly rinse and shake dry
measuring cell.
Attention: Measuring cell must never come into contact with water-repellent materials such as oil or silicone.
If conductivity measured is much higher or lower than expected this may be due to the electrode being soiled with nonconducting or conducting foreign materials. Measuring cell has to be cleaned with a watery soap solution.
When measuring media with low conductivities the electrode has to be stirred sufficiently.
2.2 Measuring hints
Conductivity measuring is comparably easy to perform, the precision of the instrument is very constant if it is used as
intended. Depending on the necessary accuracy the instruments can be used up to several years without recalibration
of the cell constant.
If the accuracy should be controlled or improved, this is done by means of suitable reference solutions and the
adjusting of the cell factor.
Attention! Wrong handling of reference solution can make them useless very fast.
Measuring procedure:
Especially when measuring low conductivity: Before immersion to the measuring solution, rinse the electrode with
deionised water, dry with a paper towel and shake remaining water out.
The measuring is speeded up considerably, if the electrode is immersed and pulled out the solution several times.
Especially when measuring low conductivity the electrode needs sufficient flow during the measuring, e.g via stirring
the solution.
When temperature compensation is activated, the electrode needs enough time to adjust to the actual temperature of
the measuring solution to work accurate.
2.3 Temperature compensation
The conductivity of aqueous solution is temperature dependent. The dependency itself is strongly dependent on the
kind of solution. For the most applications e.g. in fish farming etc., the non linear temperature compensation of natural
waters is precise (“nLF” according to EN 27888). The most common reference temperature is 25°C.
2.4 Min-/max- value memory
The lowest and highest measured value since the turning-on of the device will be stored.
Watch MIN value (Lo): press shortly key mode once display changes between ‘Lo’ and MIN value
Watch MAX value (Hi): press shortly mode once again display changes between ‘Hi’ and MAX value
restore current value: press shortly mode once again current value of the chosen unit is displayed
delete MIN/MAX value: press mode for 2 sec. MIN and MAX values will be deleted, the
display shows shortly ‘CLr’ (clear)
After switching-off and turning-on again all min-/max- values will be deleted.
2.5 Hold – function
When the hold – key is pressed, the current measured value will be ‘frozen’ (display symbol: HLD) until the key is
pressed again. Then the device will measure in its normal way again.
H66.0.01.6C-00 Operating Manual GLF100 page 4
3 Configuration of the instrument
To configure the instruments according to Your needs proceed like follows::
• Switch off instrument.
• Switch on
and press mode-key during the segment test ( ), until the display shows the first parameter ‚P_oF‘
• If a parameter should be edited, press key up or down (
can be changed via up/down keys.
• Jump to the next parameter with
parameter value meaning
key
keys
Auto Power-Off
Auto Power-Off in minutes. If there won’t be pressed any key and no interface
communication takes place for the time of the power off time setting, the device will be
switched off automatically to save battery power (adjustable range 1 to 120 min)
automatic power-off is deactivated (continuous operating)
Unit of display
Auto
Measuring of conductivity with auto-range (factory setting)
µS/cm+mS/cm
100.0 mS/cm
20.00 mS/cm
2000 µS/cm
50.0 SAL
2000 mg/l
Measuring of conductivity, range 0.0 ... 100.0 mS/cm (no auto-range)
Measuring of conductivity, range 0.00 ... 20.00 mS/cm (no auto-range)
Measuring of conductivity, range 0 ... 2000 µS/cm (no auto-range)
Measuring of Salinity, 0.0 .. 50.0 g/kg
Measuring TDS, 0 ... 2000 mg/l
Unit of temperature display
°C
°F
temperature is displayed in °C (factory setting)
temperature is displayed in °F
temperature compensation (only for µS/cm and mS/cm, p.r.t. note below)
oFF
nLF
No temperature compensation of conductivity measuring
non-linear temperature compensation for natural water acc. to EN27888 (DIN
38404) to measure ground water, surface water, drinking water and purest water
(factory setting)
Reference temperature of temp. compensation (only for t.Cor <> oFF)
25°C/77°F
20°C/68°F
Reference temperature 25°C / 77°F(factory setting)
Reference temperature 20°C / 68°F
Setting of TDS-factor
0.40...1.00
Reset settings to Ex-Works Settings
Setting of cell constant for adjusting of the measurement
Settings are kept
), the setting of the parameter will be shown and
Settings of configuration and adjustment menu are reset to ex-works settings
Pressing again stores the settings, the instruments restarts (segment test)
Please note: If there is no key pressed within the menu mode within 2 minutes, the configuration will be
cancelled, the entered settings are lost!
Note for temperature compensation: To measure the TDS value always use non-linear temperature
compensation for natural water (reference temperature = 25°C).
To measure salinity the instrument automatically switches over to the non-linear temperature
compensation acc. to IOT (reference temperature = 15°C)..
H66.0.01.6C-00 Operating Manual GLF100 page 5
4 Adjusting of the instrument
The cell correction may change due to natural ageing or deposits at the measuring cell. In case you have an accurate
reference liquid, you may adjust the instrument by changing the cell constant accordingly.
The temperature measuring is very stable and has to be adjusted in very seldom cases only.
To adjust the instruments according to Your needs proceed like follows::
• Switch off instrument.
• Switch on
and press hold-key during the segment test ( ), until the display shows the first parameter ‚CELL‘
• If a parameter should be edited, press key up or down (
and can be changed via up/down keys.
• Jump to the next parameter with key
parameter value meaning
key
Pressing again stores the settings, the instruments restarts (segment test)
Please note: If there is no key pressed within the menu mode within 60 seconds, the adjusting will be
keys
Cell-constant
0.800…1.200
Offset of temperature
-2.0…2.0°C
-3.6…3.6°F
Scale of temperature
-5.00…5.00%
cancelled, the entered settings are lost!
Adjustment of the measuring cells cell-constant
Offset setting of temperature measurement (see below)
Scale
adjustment of temperature measurement
Display = (measured value - offset) * ( 1 + scale adjustment/100)
) , the setting of the parameter will be shown
5 System Messages
Er. 1 = measuring range has been exceeded
-- = Sensor Error
Er. 7 = System fault - the device has detected a system fault (defective or far outside allowable ambient
temperature range)
If "BAT” is displayed at the left side of display, the battery is weak, measuring can be continued for a short period.
If “bAt” is displayed in the main display the battery is used up and needs to be replaced. Measuring is no more
possible.
6 Inspection of the accuracy / Adjustment Services
Accuracy can be inspected with test-solutions (extra equipment).
If the precision is no more corresponding to the imprint of the GPAD 38, we suggest to send the device to the
manufacturer for a new adjustment.
H66.0.01.6C-00 Operating Manual GLF100 page 6
7 Specification
Measuring
Principle Conductivity measuring via 2 pole graphite electrode
Meas. Ranges Range Resolution
Conductivity 0 ... 2000µS/cm 1µS/cm
0.01 ... 20.00mS/cm 0.01mS/cm
0.1 ... 100.0mS/cm 0.1mS/cm
TDS 0 ... 1999 mg/l 1mg/l
Salinity 0.0 ... 50.0 g/kg 0.1g/kg
Temperature -10.0 ... 110.0°C
Electrode 2 pole graphite electrode, integrated temperature sensor
Electrode material: special graphite
Dimensions: dia. 12mm, length 120mm, min immersion depth 30 mm
Cable length ca. 1.2m
Accuracy ±1Digit (at nominal-temperature)
Conductivity, TDS, Salinity: ±0.5% of m.v. ±0.5% FS
Temperature ±0.3K
T.-compensation: non-linear temperature compensation according to EN 27888, reference temperatures 20°C and 25°C
Nominal temperature 25°C
Ambient Temperature instrument -25 ... +50°C
Temperature cell -5 ... +80°C (short time 100°C)
Relative humidity instrument 0 ... 95%r.F. (non condensing)
Storage temperature -5 ... +50°C
Housing Dimension: 110 x 67 x 30 mm (L x B x D)
impact resistant ABS, membrane keyboard, transparent panel.
Front side IP65
Weight approx. 155 g
Power Supply 9V-Battery, type IEC 6F22 (included)
Power Consumption <1.5mA
Display ca. 11 mm high, 4-digit LCD-display with additional segments
Pushbuttons 3 membrane keys for on/off switch, menu operation, min/max/ hold-function etc.
Hold Function Press key to store current value.
Automatic-Off-Function Device will be automatically switched off if no key is pressed for the time of the power-off delay. The
power-off delay can be set to values between 1 and 120 min.; it can be completely deactivated.
EMC: The device corresponds to the essential protection ratings established in the Directives of the European
Parliament and of the council on the approximation of the laws of the member states relating to the
electromagnetic compatibility (2004/108/EC). EN61326 +A1 +A2 (Appendix B, class B),
additional error: < 1% FS
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