Hanna Instruments GROLINE MONITOR HI981420 User manual

INSTRUCTION MANUAL
HI981420
GROLINE MONITOR

Thank you for choosing a Hanna Instruments product.
Please read this instruction manual carefully before using the instrument.
This manual will provide you with the necessary information for correct use of the
instrument, as well as a precise idea of its versatility.
If you need additional technical information, do not hesitate to e‑mail us at
[email protected] or view our worldwide contact list at www.hannainst.com.
All rights are reserved. Reproduction in whole or in part is prohibited without the written consent of
the copyright owner, Hanna Instruments Inc., Woonsocket, Rhode Island, 02895, USA.
Dear
Customer,

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TABLE OF CONTENTS
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1. PRELIMINARY EXAMINATION ..........................................................................................
2. SAFETY MEASURES ........................................................................................................
3. SPECIFICATIONS ............................................................................................................
4. DESCRIPTION .................................................................................................................
4.1. SIGNIFICANCE OF USE .............................................................................................
4.2. GENERAL DESCRIPTION ............................................................................................
4.3. PRODUCT DIAGRAM ................................................................................................
4.4. KEYPAD DESCRIPTION ..............................................................................................
5. GENERAL OPERATIONS ....................................................................................................
5.1. START UP MONITOR ................................................................................................
5.2. PROBE CONNECTION.................................................................................................
5.3. ELECTRODE CONDITIONING AND MAINTENANCE .........................................................
5.4. MONITOR MENU .....................................................................................................
5.4.1. MENU OPTIONS ...............................................................................................
5.4.2. GENERAL SETUP.................................................................................................
5.4.3. pH SETUP ........................................................................................................
5.4.4. EC SETUP .........................................................................................................
5.4.5. TEMPERATURE SETUP .......................................................................................
5.4.6. ALARMS ...........................................................................................................
6. OPERATIONAL GUIDE ......................................................................................................
6.1. PROBE CALIBRATION ...............................................................................................
6.1.1. QUICK CALIBRATION .........................................................................................
6.1.2. pH CALIBRATION .............................................................................................
6.1.3. EC CALIBRATION ..............................................................................................
6.2. GLP INFORMATION .................................................................................................
6.3. MEASUREMENT MODE ............................................................................................
7. DATA STORAGE ...............................................................................................................
7.1. 24 HR. DATA FROM MEASUREMENT SCREEN .............................................................
7.2. HISTORY .................................................................................................................
7.3. DATA EXPORT ..........................................................................................................
8. ACCESSORIES .................................................................................................................
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PRELIMINARY EXAMINATIONSAFETY MEASURES
1. PRELIMINARY EXAMINATION
This product is intended to monitor pH and conductivity levels in nutrient water. Remove the
monitor and accessories from the packaging and verify that no damage has occurred during
shipping. Remove the protective film from monitor. Contact your local Hanna Instruments Office if
items are missing or damaged.
Each monitor is supplied with:
• HI1285‑8 pH/EC/TDS probe with built‑in temperature sensor, DIN connector and 2m (6.6’) cable
• HI50036‑0 Quick Calibration solution sachets (2)
• HI700661P Electrode cleaning solution sachets for agriculture (2)
• 12VDC adapter
• Instruction manual
• Monitor Quality Certificate
• Probe Quality Certificate
Note: Save all packing material until you are sure that the monitor works correctly. Any
defective item must be returned in its original packing.
2. SAFETY MEASURES
Before using this product, make sure that it is entirely suitable for your specific
application and for the environment in which it is used.
Operation of this instrument may cause interference to other electronic equipment,
requiring the operator to take steps to correct interference. Any variation introduced by
the user to the supplied equipment may degrade the monitor’s EMC performance.
To avoid damage or burns, do not put the instrument in microwave ovens.
Do not use or store the monitor in hazardous environments.

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SPECIFICATIONS
3. SPECIFICATIONS
pH Specifications
EC Specifications
TDS Specifications
*Note: 1000 μS/cm = 500 ppm with 0.5 TDS Factor
= 700 ppm with 0.7 TDS Factor
Range 0.00 to 14.00 pH, 0.0 to 14.0 pH
Resolution 0.01 pH, 0.1 pH
Accuracy (@25 ºC/77 ºF) ±0.05 pH, ±0.1pH
Calibration one or two‑point calibration (using pH 4.01,7.01, 10.01
buffers) using auto buffer recognition.
one‑point calibration using quick calibration solution
Temperature Compensation Automatic: 0.0 to 60.0 ºC; 32.0 to 140.0 °F
Range 0.00 to 10.00 mS/cm
Resolution 0.01 mS/cm
Accuracy (@25 ºC/77 ºF) ±0.1mS/cm (0.00 to 5.00mS/cm)
±0.2mS/cm (5.00 to 10.00mS/cm)
Calibration one‑point at 1.41 mS/cm or 5.00 mS/cm using auto
standard recognition.
one‑point calibration using quick calibration solution
Temperature Compensation
(not user selectable)
automatic, with b= 1.9%/°C
Range 0 to 5000 ppm (0.5 TDS Factor)*
0 to 7000 ppm (0.7 TDS Factor)*
Resolution 10 ppm
Accuracy (@25 ºC/77 ºF) ±2%FS
Calibration through EC calibration
TDS Factor 0.5(500 ppm) or 0.7(700 ppm)

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SPECIFICATIONS
Temperature Specifications
Additional Specifications
Probe
HI1285‑8 pH/EC/TDS/temperature polypropylene
body, pre‑amplified multiparameter probe with internal
temperature sensor DIN connector and 2 m (6.6’) cable
Max Pressure: 0.2 bar
pH range: 0 to 13 pH
IP68 (continous immersion up to 2 meters)
Automatic Logging
Measurements (pH, EC, TDS, Temperature)
min/max/average/status logged continuously at 15
minutes interval
Recall graphic modes
Export on USB‑C flash drive or PC
Log files in CSV format
30 days stored data at 15 minutes interval
Display
128 x 64 pixel B/W LCD with green backlight
Automatic backlight dimming using ambient light sensor
GLP Good Laboratory Practice with last 5 pH and EC
calibration history.
Monitor Waterproof Protection IP65 (dust and low pressure water jets)
Alarms High and Low with enable/disable option for all
parameters.
Range 0.0 to 60.0 °C / 32.0 to 140.0 °F
Resolution 0.1 °C / 0.1 °F
Accuracy ±0.5 °C /±1 °F

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SPECIFICATIONS
Additional Specifications
USB‑C (Host/Device) Export logged data on USB flash drive / PC
Power Supply 12VDC adapter (included)
Environment 0 to 50 °C (32 to 122 °F), RH max 95%
non‑condensing
Monitor Dimensions 125 x 185 x 38 mm (4.92 x 7.28 x 1.49”)
Monitor Weight 333g ( 11.7oz.)
Probe Dimensions 187 x 25 x 25mm (7.36 x 0.98 x 0.98”)
Probe Weight 191g ( 7.7oz.)
Ordering Information HI981420 is supplied with: HI1285‑8 multiparameter probe,
HI50036‑0 Quick Cal buffer solution sachet (2), HI700661 pH
electrode cleaning solution sachet for agriculture (2), DC power
adapter (1), and instruction manual
Warranty 2 years (probe 6 months)

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DESCRIPTION
4. DESCRIPTION
4.1. SIGNIFICANCE OF USE
pH in agriculture
pH affects the ability of plant roots to absorb nutrients. Calcium, phosphorus, potassium and
magnesium are likely to be unavailable to plants in acidic soils. Plants have difficulty absorbing
copper, zinc, boron, manganese and iron in basic soils. By managing pH, you can create an ideal
environment for plants and often discourage plant pests at the same time.
pH is measured on a scale of 0‑14. A pH reading below 7 is considered acidic, while a pH reading
above 7 is basic. A pH reading of 7 is neutral, and is ideal for many plants and spray materials.
The pH scale is logarithmic, which means that a pH reading of 6 is 10 times more acidic than a
reading of 7.
You can measure the pH of your spray tank water, or your irrigation/fertigation water.
If spray tank water is too acidic (low pH) or too basic (high pH), the pesticides mixed in can be
deactivated and may even burn the plants.
The pH of water applied to the plants should match desired soil pH. Otherwise it will gradually
change the soil pH. Acidic fertilizers can be used to lower pH. Limestone is often used to raise pH.
The type of limestone applied and your soil type can make a difference in how quickly and how much
the pH will change. Most of the nitrogen and phosphorus fertilizers used today are acid forming.
For example, about 1.5 pounds of lime is required to neutralize the effect of applying 1 pound of
anhydrous ammonia to the soil.
Some irrigation water contains substantial quantities of calcium and magnesium bicarbonates
(lime) which help neutralize the acidifying effects. Thus, soils (without free lime) under production
become increasingly acidic unless lime is artificially applied or is present in the irrigation water.
This means farmers need to frequently check soil pH to determine whether they are maintaining a
proper soil acidity level.

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DESCRIPTION
EC in agriculture
EC stands for electrolytic conductivity, or the ability of a solution to conduct an electric current.
Current travels efficiently through water with high levels of salt present (high EC), and less so
through pure water (low EC). EC indicates how much dissolved salt is in a given sample. That's why
EC is also referred to as TDS (total dissolved solids). All nutrients are salts, so EC is a measure of
your total nutrients. Knowing your EC levels will help in plant production and monitoring of inputs.
Monitoring the EC of aqueous solutions is fairly simple.
You calibrate the probe in a known standard, then submerse the sensor into the liquid.
To use EC to check fertilizer levels, take an EC reading of a precise mixture of your fertilizer and
irrigation water in the desired concentration. You can check your fertigation water at any point
along the system. Its EC should match your sample. If it doesn't, check the injectors, valves and
nozzles in the system for blockage or other problems.
Always check the EC of your water first, and subtract that number from the EC reading of your
solution to determine your fertilizer concentration.
Another way to determine the output of your fertilizer injector is by measuring the electrical
conductivity (EC) of the dilute fertilizer solution. You can get a good estimate of the fertilizer
concentration by measuring the EC of the solution by using a EC meter.
Be sure to calibrate your monitor before use and be sure to subtract the EC of your clear water from
the fertilizer reading. Compare the corrected value for the EC of your fertilizer solution to that listed
on the fertilizer bag for the ppm N you intend to be apply.
During the crop cycle, especially for short‑term crops like bedding plants, you should monitor the EC
of your fertilizer solution to check that the injector is working properly. The fertilizer label may have
the EC of several concentrations of the diluted fertilizer.
For example, the EC of 100 ppm N, is 0.65 mS/cm.

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DESCRIPTION
4.2. GENERAL DESCRIPTION
GroLine Monitor is designed to offer you the combination of pH, conductivity, (or total dissolved
solids), with temperature measurements. All operations and settings, including calibration buffers
and temperature scale selection, are included in easy to use monitor setup.
The supplied HI1285‑8 multiparameter probe measures pH, EC/TDS, and temperature in one
convenient, rugged probe. A solid‑state preamplifier is integrated into the probe to protect the pH
measurement from transient electrical noise. Sources of electrical noise include ballasts used in
lighting and pumps to circulate water and nutrient solutions. If pH reading in pH 7 buffer is around
4, the probe is broken.
Measurements are automatically logged in the internal memory of the GroLine Monitor every
15 minutes and can be viewed using the plot/record log feature or exported to a Flashdrive or by
connecting to PC.
The main operating modes of this monitor are measurement, setup and logging. Follow this
general outline of steps to get you started. The following topics are expanded in the sections of this
manual.
Other features:
• Can be integrated into a fertilizer system
• pH/EC/TDS probe with built‑in temperature sensor
• As a failsafe feature if the pH bulb breaks the pH will be around 4
• Multiple viewing options for on‑screen data
• Quick calibration using Quick Cal solution simultaneously for pH and EC
• Calibration timeout reminder from 1‑30 days for pH and EC
• Visual plot screens for real‑time data and log history
• 24 hour summary screens (plot and details)
• Alarms feature for all parameters
• Automatic Continuous Logs, 15 minute intervals, 30 day storage
• Logged Data can be stored and later exported to a USB C drive or transferred to a PC
using the USB C connection
• GLP feature calibration data for the pH and EC (up to 5 calibrations)
• Dedicated Help with contextual message
• Setup, Calibration and Operating parameters are stored in nonvolatile memory. All
settings are retained if power is lost.