Hanna Instruments HI 98280 User Manual

Instruction Manual

HI 9828

Multiparameter Meter

with GPS

www.hannainst.com

Dear CustomerDear Customer

Dear Customer,

Dear CustomerDear Customer

Thank you for choosing a HANNA instruments® product. Please read this instruction manual carefully before using the instrument. It 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 tech@hannainst.comtech@hannainst.com

tech@hannainst.com or see the back cover for our worldwide contact list.

tech@hannainst.comtech@hannainst.com This instrument is in compliance with the directives.

HANNA instruments® reserves the right to modify the design,

construction and appearance of its products without advance notice.

TABLE OF CONTENTS

CHAPTER 1- INTRODUCTION

1.1 Preliminary Examination ................................................................................. 7

1.2 Model Identification ....................................................................................... 7

1.3 General Description ....................................................................................... 8

1.4 Power Supply ............................................................................................... 10

1.4.1 Battery Installation .................................................................................. 10

1.4.2 Charging Batteries .................................................................................. 10

1.5 Probe Description and Installation .................................................................. 11

1.5.1 Sensor Description .................................................................................. 11

1.5.2 Specifications of Sensors .......................................................................... 12

1.5.3 DO Sensor Activation.............................................................................. 13

1.5.4 Installation............................................................................................. 13

1.6 Specifications ............................................................................................... 14

1.7 Power Consumption ......................................................................................17

1.8 Display and Keyboard Description .................................................................. 18

1.9 Help Function .............................................................................................. 19

CHAPTER 2 - MEASUREMENT MODE ............................................................. 20

CHAPTER 3 - SETUP MODE

3.1 Measurement Setup ...................................................................................... 21

3.2 System Setup ................................................................................................ 23

3.3 Table of Measurement and System Setup Items .................................................. 27

CHAPTER 4 - CALIBRATION MODE

4.1 Quick Calibration ........................................................................................ 29

4.2 pH Calibration ............................................................................................. 31

4.2.1 Preparation ........................................................................................... 31

4.2.2 Procedure.............................................................................................. 31

4.2.3 Error List ................................................................................................ 33

4.3 Dissolved Oxygen Calibration ........................................................................ 34

4.4 Conductivity Calibration ................................................................................ 35

4.5 Atmospheric Pressure Calibration ................................................................... 38

4.6 ORP Calibration .......................................................................................... 38

4.7 Temperature Calibration ............................................................................... 39

CHAPTER 5 - GPS MENU (optional) ............................................................... 40

CHAPTER 6 - LOGGING MODE

6.1 Logging ...................................................................................................... 43

6.1.1 Logging Options .................................................................................... 43

6.2 Log Data Setup ............................................................................................ 45

6.2.1 Lots ...................................................................................................... 45

6.2.2 Delete All Lots ........................................................................................ 46

6.2.3 Remarks ................................................................................................ 47

6.2.4 Delete All Remarks ..................................................................................47

6.2.5 Tags...................................................................................................... 47

CHAPTER 7 - GLP DATA

7.1 Probe Information .........................................................................................50

7.2 pH ............................................................................................................. 51

7.3 Dissolved Oxygen .........................................................................................51

7.4 Conductivity ................................................................................................ 52

7.5 Atmospheric Pressure .................................................................................... 52

7.6 ORP ........................................................................................................... 53

7.7 Temperature ................................................................................................. 53

CHAPTER 8 - PC CONNECTION

8.1 Software Installation ...................................................................................... 54

8.2 PC Connection ............................................................................................ 54

CHAPTER 9 - ERROR MESSAGES .................................................................... 56

APPENDIX

A - PROBE MAINTENANCE ................................................................................ 59

B - ACCESSORIES .............................................................................................. 61

C - WARRANTY ................................................................................................. 63

Chapter 1 - INTRODUCTION

1.1 PRELIMINARY EXAMINATION

Remove the instrument from the packing material and examine it carefully to make sure that no damage has occurred during shipping. If there is any noticeable damage, notify your Dealer or the nearest HANNA Customer Service Center immediately.

HI9828HI9828

HI9828 is supplied complete with:

HI9828HI9828

- Multisensor probe (pH/ORP, Conductivity, DO, temperature) HI9828-25HI9828-25

HI9828-25 quick calibration standard solution, 500 mL

HI9828-25HI9828-25

- Calibration beaker

- Probe maintenance kit

- 4 rechargeable C size, Ni-MH batteries

- Power adaptor and cable

- Cigarette lighter cable

- 5 iButton® with holder HI7698281HI7698281

HI7698281 USB interface cable

HI7698281HI7698281 HI929828HI929828

HI929828 Windows® compatible software

HI929828HI929828

- Instruction manual

- Rugged carrying case

NoteNote

Note Save all packing materials until you are sure that the instrument func-

NoteNote

tions correctly. Any damaged or defective items must be returned in their original packing materials together with the supplied accessories.

1.2 MODEL IDENTIFICATION

Different models are available according to the following scheme:

Note: Probes with different cable length are

available upon request.

Windows® is a registered Trademark of “Microsoft Co.”

1.3 GENERAL DESCRIPTION

HI9828 is a multiparameter system that monitors up to 13 different water qual-

ity parameters (6 measured, 7 calculated). The microprocessor based multisensor probe allows to measure all the param-

eters necessary to evaluate the water quality, as dissolved oxygen saturation percentage, conductivity, seawater specific gravity and other parameters that ensure life in water as pH and temperature. The same probe can be used with different meters without needing any recalibration.

HI9828 is also provided with a built-in 12 channel GPS receiver and antenna, that guarantee a position accuracy of 10 m (30 ft). Measurements from specific locations are tracked with detailed coordinate information that can be viewed immediately on the display. GPS information can be transferred to a PC using HANNA’s HI929828 software. GPS information can also be viewed using a GPS mapping software such as Google™ Maps. Clicking on visited locations using a mapping software such as Google™ Maps displays measurement information. For measuring points within a 10 meter range or where GPS signal is not available, HI9828’s Fast Tracker™ is invaluable for associating measurements with their locations. HANNA’s exclusive Fast Tracker™—T.I.S. (Tag ID System) monitors and records data using iButton®s that can be installed at any number of sampling sites. HI9828 features a graphic, backlit display that automatically sizes the digits to fit the screen and allows full configuration of each parameter measured along with on-screen graphing capability. Designed for outdoor environments, waterproof, resistant and easy to use, HI9828 is the ideal solution for field measurements of lakes, rivers and sea. The meter meets IP67 standards (30 minutes immersion under 1 m of water); the multi sensor probe can be left underwater (IP68 standard). The setting menu can be protected by password to avoid not authorized modifications and the help function is always available to explain the selected function, operation or message.

GOOGLE™ is a registered trademark of Google, Inc. HANNA instruments® has no affiliation with Google™, Inc. iButton® is a registered trademark of Maxim/Dallas Semiconductor Corp.

Main features of the HI 9828 system:

• Simultaneously displaying of up to 12 parameters

• Tracking of measurement locations with GPS (optional)

• IP67 waterproof protection for meter and IP68 for probe

• Exclusive Fast Tracker™—T.I.S. (Tag ID System)

• Graphic LCD with backlight

• Built-in barometer for DO compensation

• Quick Calibration feature

• Measurement check to eliminate any erroneous readings

• Auto recognition of pH and pH/ORP probe

• Logger function to record the data of all connected sensors

• Log-on-demand and automatic logging (up to 60,000 samples)

• Logged data can be displayed as graphs

• USB interface for PC communication

• Auto-range of EC and TDS readings

• Good Laboratory Practice feature with recording of last 5 calibrations

• Field replaceable sensors

• Meter can be powered with both alkaline and rechargeable batteries

1.4 POWER SUPPLY

HI9828HI9828

HI9828 is supplied with 4 rechargeable C size, Ni-MH batteries.

HI9828HI9828 The battery symbol on the LCD shows the remaining battery charge. When the

symbol starts blinking, batteries should be charged or replaced with new ones. When the batteries are completely rundown the meter automatically shuts off to avoid erroneous readings.

1.4.1 Battery Installation

Battery replacement must only take place in a nonhazardous area.

Remove the 4 screws on the rear of the instrument and insert the batteries while paying attention to the correct polarity.

If using rechargeable batteries, move the switch down toward the probe connector. Move the switch upward for not rechargeable alkaline batteries.

Not rechargeable batteries can explode or leak if attempting to charge them with the switch set to down position.

1.4.2 Charging Batteries

HI9828HI9828

HI9828 is supplied with two cables for charging batteries:

HI9828HI9828 HI710046HI710046

HI710046.

HI710046HI710046

Mains power supply In order to charge batteries from the mains, use the

HI710045HI710045

HI710045 cable and the

HI710045HI710045

supplied 12 Vdc adapter.

• With the meter OFF, disconnect the probe.

• Connect the

HI710045HI710045

HI710045 to meter connector and power adapter, then con-

HI710045HI710045

nect the adapter to the mains.

• The message “Battery charging in progress” will appear on the LCD, followed by the battery symbol.

• A complete battery charging will last about 14 hours.

HI710045HI710045

HI710045 and

HI710045HI710045

Cigarette lighter supply

To charge batteries from a vehicle cigarette lighter supply, use

HI710046HI710046

HI710046 cable.

HI710046HI710046

• Simply connect the cable to the meter and to the cigarette lighter plug.

• The message “Battery charging in progress” will appear on the display, followed by the battery symbol.

• A complete battery charging will last about 14 hours.

NoteNote

Note Batteries can also be charged with the meter ON; if the auto-off fea-

NoteNote

ture is enabled, the meter turns off automatically after the set time.

1.5 PROBE DESCRIPTION & INSTALLATION

HI9828HI9828

HI9828 is supplied with a multisensor probe for dissolved oxygen, temperature,

HI9828HI9828 conductivity, pH and redox measurements.

1.5.1 Sensor Description

The galvanic DO sensor allows to obtain stable readings in a few seconds. The thin permeable membrane isolates the sensor elements from the testing solution, but allows oxygen to enter. Oxygen that passes through the membrane causes a current flow, from which the oxygen concentration is determined. Before installing the probe, it is necessary to activate the DO sensor; see paragraph 1.5.3 for details.

The conductivity sensor uses the 4-ring technology that allows stable and linear readings without any interference in the whole range.

The pH/ORP sensor features a glass membrane for pH readings and a Pt sensor for redox measurements. To avoid clogging problems and ensure a fast response, the pH bulb must be kept moist at any time. Store the electrode with a few drops of

HI70300HI70300

HI70300 storage solution in the pro-

HI70300HI70300

tective cap.

The EC sensor also works as matching pin and must be always mounted to have correct pH readings.

For correct redox measurements, the surface of the electrode must be clean and smooth, and a pretreatment procedure should be performed to ensure quick response.

Since the Pt/PtO system depends on the pH, the pretreatment of the electrode may be determined by the pH and the redox potential values of the solution to be measured.

As a general rule, if the ORP (mV) reading corresponding to the solution pH value is higher than the values in the table below, an oxidizing pretreatment is necessary; otherwise perform a reducing pretreatment.

pHpH

mVmV

pHpH

mVmV

pHpH

mVmV

pHpH

mVmV

pH pH

pHpH

mVmV

pHpH

mVmV

pHpH

mVmV

pHpH

mVmV

pH pH

mV mV

pHpH

mVmV

0 990 1 920 2 860 3 800 4 740 5 680

6 640 7 580 8 520 9 460 10 400 11 340

12 280 13 220 14 160

For reducing pretreatment: immerse the electrode for a few minutes in HI 7091.

For oxidizing pretreatment: immerse the electrode for a few minutes in HI 7092.

1.5.2 Specifications of Sensors

HI769828-0 HI769828-1 HI769828-2 HI769828-3

Description pH pH/ORP DO EC

Measure Type pH, mV (pH) pH, mV (pH), mV DO (% sat. & conc.) EC, TDS,

resistivity, salinity

Measure Range 0.00 to 14.00 0.00 to 14.00 0.0 to 500.0 % 0.000-200.000 mS/cm

±600.0 mV (pH) ±600.0 mV (pH) 0.00 to 50.00 mg/L 0-400000 mg/L

Color Code Red Red White Blue

Materials Tip: glass (pH) Tip: glass (pH); Pt (ORP) Cat/An: Ag/Zn Rings: Stainless steel

Junction: cloth Junction: cloth Membrane: PTFE AISI 316

Body: PEI Body: PEI Body: PVC Body: PVC

Electrolyte: gel Electrolyte: gel

Reference: double Reference: double

Maintenance HI 70300 HI 70300 HI 7042S - Solution (storage) (storage) (membrane refilling)

Dimensions 100 x 14 Ø mm 100 x 14 Ø mm 101 x 16.5 Ø mm 111 x 14 Ø mm

±2000.0 mV 0 to 1.0000 MΩ•cm

0.00 to 70.00 PSU

1.5.3 DO Sensor Activation

pH/ORPprobeDOprobe

ECprobe

Probewith calibrationbeaker

Probewith protectionsleeve

pH/ORPprobeDOprobe

ECprobe

Probewith calibrationbeaker

Probewith protectionsleeve

Temperature sensor

The DO probe is shipped dry. To hydrate the sensor and prepare it for use, proceed as follows:

• Remove the black & red plastic cap. This cap is used for shipping purposes only and can be thrown away.

• Insert the supplied O-ring in the membrane.

• Rinse the supplied membrane with some electrolyte solution while shaking it gently. Refill with clean electrolyte. Gently tap the membrane over a surface to ensure that no air bubbles remain trapped. To avoid damaging the membrane, do not touch it with your fingers.

• With the sensor facing down screw the cap clockwise to the end of the threads. Some electrolyte will overflow.

1.5.4 Installation

The multisensor probe can support 3 different sensors: DO, EC, pH or pH/ORP. To make easier the installation, the sensors are color coded.

For a correct installation, proceed as follow:

• Grease the O-ring gaskets.

• Insert the sensor while paying attention to the correct alignment with the corresponding colored connector. Fix the sensor by screwing the locking nut with the supplied tool.

• When all sensors are mounted, screw the protection sleeve for taking measurements or the transparent beaker for calibrating.

• With the meter off, connect the probe to the DIN socket on the bottom of the instrument by aligning the pins and pushing in the plug. Tighten the nut to ensure good connection.

1.6 SPECIFICATIONS

TEMPERATURE

RangeRange

Range -5.00 to 55.00 °C;

RangeRange

23.00 to 131.00 °F; 268.15 to 328.15 K

ResolutionResolution

Resolution 0.01 °C; 0.01 °F; 0.01 K

ResolutionResolution AccuracyAccuracy

Accuracy ± 0.15 °C; ± 0.27 °F; ±0.15 K

AccuracyAccuracy CalibrationCalibration

Calibration Automatic at 1 custom point

CalibrationCalibration

pHpH

pHpH RangeRange

Range 0.00 to 14.00 pH; ± 600.0 mV

RangeRange ResolutionResolution

Resolution 0.01 pH; 0.1 mV

ResolutionResolution AccuracyAccuracy

Accuracy ± 0.02 pH; ± 0.5 mV

AccuracyAccuracy CalibrationCalibration

Calibration Automatic 1, 2 or 3 points with 5 memorized

CalibrationCalibration

standard buffers (pH 4.01, 6.86, 7.01, 9.18, 10.01)

or 1 custom buffer

ORP

RangeRange

Range ± 2000.0 mV

RangeRange ResolutionResolution

Resolution 0.1 mV

ResolutionResolution AccuracyAccuracy

Accuracy ± 1.0 mV

AccuracyAccuracy CalibrationCalibration

Calibration Automatic at 1 custom point

CalibrationCalibration

DISSOLVED OXYGEN

RangeRange

Range 0.0 to 500.0 %

RangeRange

0.00 to 50.00 mg/L

ResolutionResolution

Resolution 0.1 %

ResolutionResolution

0.01 mg/L

AccuracyAccuracy

Accuracy 0.0 to 300.0 %: ± 1.5 % of reading

AccuracyAccuracy

or ± 1.0% whichever is greater;

300.0 to 500.0 %: ± 3% of reading

0.00 to 30.00 mg/L: ± 1.5 % of reading or 0.10 mg/L whichever is greater;

30.00 mg/L to 50.00 mg/L: ± 3% of reading

CalibrationCalibration

Calibration Automatic 1 or 2 points at 0, 100 % or 1 custom point

CalibrationCalibration

CONDUCTIVITY

RangeRange

Range 0.000 to 200.000 mS/cm

RangeRange

(actual EC up to 400 mS/cm)

ResolutionResolution

Resolution

ResolutionResolution

Manual 1 µS/cm; 0.001 mS/cm; 0.01 mS/cm; 0.1 mS/cm; 1 mS/cm Automatic 1 µS/cm from 0 to 9999 µS/cm

0.01 mS/cm from 10.00 to 99.99 mS/cm

0.1 mS/cm from 100.0 to 400.0 mS/cm

Automatic mS/cm 0.001 mS/cm from 0.000 to 9.999 mS/cm

0.01 mS/cm from 10.00 to 99.99 mS/cm

0.1 mS/cm from 100.0 to 400.0 mS/cm

AccuracyAccuracy

Accuracy ±1 % of reading or ±1 µS/cm whichever is greater

AccuracyAccuracy CalibrationCalibration

Calibration Automatic at 1 point with 6 memorized standards

CalibrationCalibration

(84 µS/cm, 1413 µS/cm, 5.00 mS/cm, 12.88 mS/cm,

80.0 mS/cm, 111.8 mS/cm) or custom point

RESISTIVITY

RangeRange

Range 0 to 999999 Ω·cm;

RangeRange

(depending on measurement setup) 0 to 1000.0 kΩ·cm;

0 to 1.0000 MΩ·cm

ResolutionResolution

Resolution Depending on resistivity reading

ResolutionResolution CalibrationCalibration

Calibration Based on conductivity or salinity calibration

CalibrationCalibration

TDS

RangeRange

Range 0 to 400000 mg/L or ppm;

RangeRange

(the maximum value depends on the TDS factor)

ResolutionResolution

Resolution

ResolutionResolution Manual 1 mg/L (ppm); 0.001 g/L (ppt);

0.01 g/L (ppt); 0.1 g/L (ppt); 1 g/L (ppt)

Automatic 1 mg/L (ppm) from 0 to 9999 mg/L (ppm)

0.01 g/L (ppt) from 10.00 to 99.99 g/L (ppt)

0.1 g/L (ppt) from 100.0 to 400.0 g/L (ppt)

Automatic g/L (ppt) 0.001 g/L (ppt) from 0.000 to 9.999 g/L (ppt)

0.01 g/L (ppt) from 10.00 to 99.99 g/L (ppt)

0.1 g/L (ppt) from 100.0 to 400.0 g/L (ppt)

AccuracyAccuracy

Accuracy ±1 % of reading or ±1 mg/L (ppm) whichever is greater

AccuracyAccuracy CalibrationCalibration

Calibration Based on conductivity or salinity calibration

CalibrationCalibration

SALINITY

RangeRange

Range 0.00 to 70.00 PSU (extended Practical Salinity Scale)

RangeRange ResolutionResolution

Resolution 0.01 PSU

ResolutionResolution AccuracyAccuracy

Accuracy ±2% of reading or ±0.01 PSU whichever is greater

AccuracyAccuracy CalibrationCalibration

Calibration 1 custom point

CalibrationCalibration

SEAWATER SPECIFIC GRAVITY

RangeRange

Range 0.0 to 50.0 σt, σ0, σ

RangeRange ResolutionResolution

Resolution 0.1 σt, σ0, σ

ResolutionResolution AccuracyAccuracy

Accuracy ± 1σt, σ0, σ

AccuracyAccuracy CalibrationCalibration

Calibration Based on conductivity or salinity calibration

CalibrationCalibration

ATMOSPHERIC PRESSURE

RangeRange

Range 450 to 850 mmHg; 17.72 to 33.46 inHg;

RangeRange

600.0 to 1133.2 mbar; 8.702 to 16.436 psi;

0.5921 to 1.1184 atm; 60.00 to 113.32 kPa

ResolutionResolution

Resolution 0.1 mmHg; 0.01 inHg; 0.1 mbar

ResolutionResolution

0.001 psi; 0.0001 atm; 0.01 kPa

AccuracyAccuracy

Accuracy ±3 mmHg within ±15°C from calibration temperature

AccuracyAccuracy CalibrationCalibration

Calibration Automatic at 1 custom point

CalibrationCalibration

GENERAL CHARACTERISTICS

emperature Compensationemperature Compensation

emperature Compensation Automatic from -5 to 55 °C (23 to 131 °F)

emperature Compensationemperature Compensation

Logging Memory(*)Logging Memory(*)

Logging Memory(*) Up to 60,000 samples with 13 measurements each;

Logging Memory(*)Logging Memory(*)

up to 45,000 samples with 15 measurements each (w/GPS)

Logging IntervalLogging Interval

Logging Interval 1 second to 3 hours

Logging IntervalLogging Interval PC InterfacePC Interface

PC Interface USB (with HI 929828 software)

PC InterfacePC Interface WW

aterproof Paterproof P

aterproof P

aterproof Paterproof P

EnvironmentEnvironment

Environment 0 to 50 °C (32 to 122 °F); RH 100 %

EnvironmentEnvironment PP

ower Supplyower Supply

ower Supply 4 x 1.2 V rechargeable C size, Ni-MH batteries

ower Supplyower Supply

rotectionrotection

rotection Meter IP67, Probe IP68

rotectionrotection

or 4 x 1.5 V alkaline, C size batteries

Dimensions/WDimensions/W

Dimensions/W

Dimensions/WDimensions/W

eighteight

eight

eighteight Meter 221x115x55 mm (8.7x4.5x2.2”) / 750 g (26.5 oz.) Probe (w/out cable) L=270 (10.6”), dia=46 mm (1.8”) / 750 g (26.5 oz.)

(*) Without remarks. When using remarks the maximum number of samples decreases.

1.7 POWER CONSUMPTION

For firmware versions before 2.0, the meter never features the GPS unit and the battery life does not depend on logging interval or logging state:

• supplied rechargeable batteries (full charge): approximately 70 hours of continuous use, without backlight

• alkaline batteries: approx. 150 hours of continuous use, without backlight

For firmware version 2.0 and subsequents, see below table: to find out the battery life, make a crossing between GPS use and logging interval.

All values refer to meter working without LCD backlight, and using the supplied rechargeable batteries (completely charged).

If using the device in normal measuring mode with the backlight always on and no GPS, the battery life will be approximately 80 hours with rechargeable batteries and 160 hours with alkaline batteries.

Logging interval No GPS GPS ON and GPS ON and

“GPS power save” “GPS power save” enabled disabled

Log-on-demand 7 days 30 hours 30 hours or 1 second

1 minute 9 days 30 hours 30 hours 2 minutes 10 days 30 hours 30 hours 4 minutes 10 days 2 days 30 hours 10 minutes 11 days 4 days 30 hours 20 minutes 11 days 6 days 30 hours 30 minutes 11 days 7 days 30 hours

Notes

• “No GPS” means: model without GPS, GPS unit always OFF or OFF after the first sample (see “Logging Mode” chapter for details).

• All data in the table have to be doubled if using alkaline batteries.

1.8 DISPLAY & KEYBOARD DESCRIPTION

1. Graphic LCD

2. Battery level indicator

3. Softkey functions

4. Left softkey: function defined on display

5. On/off key: to turn the meter on and off

6. Lamp key: to turn the backlight on and off

7. Alphanumeric keyboard: to insert alphanumeric codes

8. HELP key: to obtain information about the displayed screen

9. Arrow keys: to scroll the displayed options/message

10. ESC key: to return to the previous screen

11. Right softkey: function defined on display

12. Indicator of GPS signal strength (optional)

13. Tag reader

1.9 HELP FUNCTION

HI9828HI9828

HI9828 features a context sensitive HELP, which provides useful information

HI9828HI9828 regarding the displayed screen.

Simply press the HELP key to access this function, then use the arrow keys if you need to scroll long messages.

To escape from the HELP window, press HELP key again or ESC.

Chapter 2 - MEASUREMENT MODE

HI9828HI9828

HI9828 can read at the same time different parameters from the same probe.

HI9828HI9828 As described in the previous section, up to 3 sensors can be mounted on the probe.

• Connect the probe to the meter and carefully fix the protection sleeve.

• Immerse the probe into the sample while paying attention to avoid stones.

• Press the on/off key to turn the meter on: the display shows “HANNA HI9828” and the firmware version, then enters the measurement mode.

• The display shows the readings of all enabled parameters and the location coordinates (depending on model and if the GPS feature is enabled). See Chapter 3 for details.

• Press <Log> to store the readings or <Menu> to enter in the main menu. See Chapter 5 for details.

NoteNote

Note If no probe is detected, the message “Probe disconnected!” appears. In

NoteNote

this case only the <Menu> softkey is available and only a few functions are active (i.e. those that not require readings).

Up to 12 measurements can be enabled at the same time, and based on number of enabled parameters, the display automatically changes its resolution and sizes the digits to fit the screen.

A small “A” letter added to the µS/cm or mS/cm unit, refers to an actual conductivity value, i.e. a conductivity reading with no temperature compensation.

When a measurement is out of range or not available, the nearest full scale value will slowly and continuously blink.

If GPS is enabled and no GPS signal is received, the last detected GPS coordinates will blink on the LCD.

Press the lamp key, to turn the backlight on and off. After one minute with no key pressed, the backlight automatically turns off.

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