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Air Products equipment and controls, see our web site at
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Conductivity Calibration
A.
There are many ways to calibrate these meters for
conductivity depending on the options selected, the following
are Green Air Products recommendations for calibration to read
nutrient solution strengths for hydroponics. Following these will
ensure accuracy in a user-friendly manner.
B.
Since all TDS (ppm/ppt) readings are based on EC (uS,
mS) we recommend calibrating by using EC (uS, mS). We also
recommend setting the EC/TDS conversion factor (CONV) to
0.70. To change conversion factor: turn the meter on, select
either ppm or uS (ppt or mS for the GI-98130) measurement
option. Now press and hold the O/Mode button until the
secondary display reads TEMP. Press the O/Mode button once
more to show current conversion factor. Example: 0.50 CONV.
Use the Set/Hold button to change conversion factors to 0.70.
To continue you must press the O/Mode button again. This will
take you to a setting mode called BETA, make sure your BETA
value is and remains on 1.9. Note: BETA is a temperature
compensation coefficient used mainly in certain laboratory
situations and not needed for hydroponics. If you need to change
this setting, use the Set/Hold button while in BETA mode.
Pressing the O/Mode button one more time will return you to
normal measuring mode.
C.
To calibrate conductivity
: with the meter on, select the uS
(mS for the GI-98130) measurement option, then press and
hold the O/Mode button until the LCD reads CAL, immediately
let go of the button when you see “CAL”. The meter will prompt
you to use 1413uS (or 12.88mS) buffer solution. Immerse the
probe into the solution. Notice the CAL icon in the lower left
corner is flashing to denote that the meter is trying to calibrate.
Once the calibration has been automatically performed, the LCD
will flash OK for 1 sec. before returning to normal measurement
mode (keep close watch for the OK or you might miss it). You
are now free to measure conductivity in either uS or ppm (mS
or ppt on GI-09129). Note: the CAL icon in lower left corner of
LCD now remains solid, signifying calibration is completed.
Calibrating pH
A.
Make sure that the meter is powered on and is in the pH
measurement option. Now press and hold the O/MODE button
until “CAL” appears on the secondary display. Immediately
release the button when you see the “CAL” icon. The LCD will
now read 7.01 in the primary display and USE under in the
secondary display. Notice the CAL icon will be flashing in the
lower left corner of the LCD. Fully submerge the electrode
(located at the bottom of the pen) in Genesis pH 7.01 buffer
solution. The meter will automatically recognize the buffer and
calibrate to it. After recognition of the 7.01 the meter will prompt
you to use 4.01. At this time you may opt out and use a single
point calibration of 7.01 or continue to perform a two-point
calibration. To opt out and use a single point calibration of 7.01,
simply press the O/Mode button.
B. To proceed with a two point calibration.
Rinse the
electrode with pure water to avoid cross-contamination. Then
submerge electrode into pH 4.01 buffer solution. After
recognition of the 4.01, OK will flash for 1 second on the LCD,
(watch the LCD closely or you may miss the OK) then the meter
will return to normal measurement mode. At this time, you may
notice that the CAL icon (bottom left of LCD) that was flashing
now remains. This denotes that the calibration process has
been completed. NOTE: for hydroponics and growing
applications, we recommend pH 7.01. For people who have
need for NIST 6.86 buffer follow instructions as follows:
With meter on and in pH measurement option press and hold
the O/Mode button again to show current buffer set which will
be pH 7.01, to switch to pH 6.86 use the Set/Hold button to
toggle between the two. Press the O/Mode button to return to
normal measurement mode.
Taking Measurements & Changing Temperature Units
A. To take a Measurement
: While the meter is on, select
desired measurement option (pH, uS, ppm for GI-98129 or pH,
mS, ppt for GI-98130). Submerge the electrode directly into
the solution or sample to be tested while stirring gently. For
sample testing use plastic, paper, or styrofoam to hold the
solution to avoid electromagnetic interference. Measurement
is complete when the stability indicator disappears. The
measurements are automatically temperature compensated by
ATC software within the meter.
B. To Select °C or °F to Read Temperature:
With meter on
and in any measurement option, press and hold O/Mode button
until LCD reads TEMP then release button. Now use the Set/
Hold button to toggle between °C and °F To return to normal
measurement mode, press the O/Mode button twice.
Battery Replacement:
The meter displays the remaining
battery percentage every time it is switched on. When the
battery level is below 5%, the
battery symbol on the bottom left
of the LCD lights up to indicate a low battery condition. The
batteries must be immediately replaced. If however the battery
level is so low as to cause erroneous reading, the Battery Error
Prevention System (BEPS) will automatically turn the meter
off.
1. Battery Compartment
2. LCD Display
3. ON/Off/MODE Button
4. pH Electrode
5. Temperature Sensor
6. Conductivity Probe
7. SET/HOLD Button
1. Indicates Automatic Temperature Compensation (ATC)
2. Stability Indicator (meter is calculating reading)
3. Percentage of battery life display icon
4. Calibration is complete icon (flashes during calibration)
5. Low Battery Indicator (shows replacement is necessary)
6. Measurement Mode Indicator
7. Primary Reading Display
8. Temperature Scale Icon
9. Secondary Display
To change the batteries, remove the 4 screws located on the
top of the meter. Once the top has been removed, carefully
replace the 4 batteries located in the compartment while paying
attention to their polarity. Replace the top, making sure that
the gasket is properly seated in place, and tighten the screws.
DO NOT OVERTIGHTEN THE BATTERY COVER!!!
Feature Descriptions
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