Equipment for the Study of Fresh Water (Limnology)

Complete Water Analysis in the Palm of Your Hand: Precision and Connectivity in a Single Device

Measures pH, ORP, Turbidity, Conductivity, Dissolved Oxygen, and Temperature with Bluetooth® Technology for Real-Time Monitoring.

The HI98594 is a portable multiparameter logging system (meter and probe) that monitors up to 14 different water quality parameters (7 measured and 7 calculated), such as pH, ORP, turbidity, conductivity, dissolved oxygen, and temperature. The HI98594 features a backlit graphic display that automatically adjusts the digit size to fit the screen and allows on-screen graphing. Each parameter is fully configurable.

The HI98594 is designed to withstand harsh environmental conditions and is ideal for field measurements. The meter meets the IP67 standard (30 minutes immersion at a depth of 1 m) and the multisensor probe is fully sealed against water and dust, meeting the IP68 standard (continuous immersion in water). The meter incorporates a dual charging system, using a rechargeable lithium battery and backup alkaline batteries to extend its use in the field.

The meter can log data that is easily downloaded as a CSV file or graph using Bluetooth® wireless technology for the Hanna Lab app on iOS and Android devices, or to a PC via a USB type A to C cable.

Features

• Rugged and waterproof meter with an impermeable probe.
• Monitors up to 14 different water quality parameters.
• Instant conductivity and turbidity measurements.
• Field-replaceable sensors with automatic recognition (including optical technology for dissolved oxygen).
• Integrated barometer for compensation of percent saturation and dissolved oxygen measurements.
• Dual battery system for extended field use.
• Good Laboratory Practice (GLP) function, which automatically stores the last 5 calibrations.
• Backlit graphic display for viewing logged data.
• On-demand data logging and automatic logging of all parameters.
• Log file download:
• Via Bluetooth® wireless technology to Hanna Lab.
• To a USB type C memory.
• USB-C interface for PC communication.
• Remote firmware update.

The HI98594 can display 1 to 14 parameters on its high-contrast backlit LCD screen. pH, EC (electrical conductivity), and dissolved oxygen (DO) measurements are automatically compensated for temperature variations. Additionally, dissolved oxygen concentration measurements are automatically compensated for barometric pressure and salinity.

Data Logging

The HI98594 allows logging a single data point or performing continuous logging at selected time intervals. All logs can be stored in a named batch and allow adding observations. These functions facilitate the collection of meaningful data, including notes on local environmental conditions.

Dual Power Supply

The meter operates with a built-in lithium-ion battery. When the rechargeable battery is depleted, the meter automatically switches to 1.5 V AA alkaline batteries.

Quick Calibration

The Quick Calibration function allows for a quick one-point calibration for pH, conductivity, and dissolved oxygen. Standard calibration options are also available, including:

• pH up to three points.
• Conductivity at one point.
• Turbidity using three provided standards.
• Dissolved oxygen up to two points.

GLP Data

Calibration information is logged along with a timestamp and date. This includes calibration values and other relevant data that may affect measurements. GLP data is stored along with the logged data.

Bluetooth® 5.0 Connectivity and Hanna Lab App Compatibility

The HI98594 allows wireless connection with smart devices via the Hanna Lab App. Through the app, log batches can be emailed or downloaded for review.

Data Sharing

Logs can be shared as .CSV or PDF files.

GLP

Complete GLP (Good Laboratory Practice) data can be reviewed for all parameters when the logged data is downloaded to a smart device.

Unit Selection

When reviewing data on a smart device, there is an option to select the measurement units to be displayed regardless of the meter's configuration.

Data Graphing

For trend analysis, the Hanna Lab App offers the option to graph the logged data.

Multifunction Sensor

The HI7698594 is delivered with pre-installed sensors for pH/ORP, EC/Turbidity, and optical dissolved oxygen.

Quick Sensor Replacement

Sensor replacement is quick and easy thanks to field-replaceable screw-type connectors, color-coded for easy identification. These meters automatically recognize the connected sensors.

Smart Caps for Optical Dissolved Oxygen

The optical dissolved oxygen sensor uses a smart cap that features an RFID tag that stores unique calibration coefficients for each cap. The RFID tracks the cap's lifespan and alerts the user when it needs to be replaced.

• Specifications
• In the Box
• Required Items
• Optional Items
• Documents

• HI98594 Specifications

  Parameter	Range	Resolution	Accuracy	Calibration
  pH / mV	0.00 to 14.00 pH* / ±600.0 mV	0.01 pH / 0.1 mV	±0.02 pH / ±1.2 mV	One point using the quick calibration solution HI9828-20. Up to three points using standard buffers pH 4.01, pH 6.86, pH 7.01, pH 9.18, pH 10.01, and a custom buffer.
  ORP	±2000.0 mV	0.1 mV	±1.0 mV	Automatic at a custom point (relative mV).
  Dissolved Oxygen	0.0 to 500.0 % saturation 0.00 to 50.00 ppm (mg/L)	0.1 % saturation 0.01 ppm (mg/L)	±1.5 % of reading from 0.0 to 200.0 % saturation. ±5 % of reading from 200.0 to 500.0 % saturation. ±1.5 % of reading from 0.00 to 20.00 mg/L. ±5 % of reading from 20.00 to 50.00 mg/L.	One point in water-saturated air. One or two points at 100 % and 0 %. One point using a custom solution (% saturation or mg/L).
  Pressure Compensation	Automatic from 450 to 850 mmHg

  
  

  Parameter	Range	Resolution	Accuracy	Calibration
  EC	0 to 200 mS/cm 0 to 400 mS/cm (absolute)	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	±1 % of reading or ±1 μS/cm, whichever is greater	One point using the quick calibration solution HI9828-20 One point using standard solutions of 84 μS/cm, 1413 μS/cm, 5.00 mS/cm, 12.88 mS/cm, 80.0 mS/cm, 111.8 mS/cm, or a custom point
  Resistivity	0 to 999999 Ω·cm 0 to 1000.0 kΩ·cm 0 to 1.0000 MΩ·cm	1 Ω·cm 0.1 kΩ·cm 0.0001 MΩ·cm	-	Based on conductivity calibration

  
  

  Parameter	Range	Resolution	Accuracy	Calibration
  TDS	0 to 400000 ppm (mg/L) (maximum value depends on TDS factor)	Manual: 1 ppm (mg/L); 0.001 ppt (g/L); 0.01 ppt (g/L); 0.1 ppt (g/L); 1 ppt (g/L) Automatic: 1 ppm (mg/L) from 0 to 9999 ppm (mg/L) 0.01 ppt (g/L) from 10.00 to 99.99 ppt (g/L) 0.1 ppt (g/L) from 100.0 to 400.0 ppt (g/L) Automatic (ppt): 0.001 ppt (g/L) from 0.000 to 9.999 ppt (g/L) 0.01 ppt (g/L) from 10.00 to 99.99 ppt (g/L) 0.1 ppt (g/L) from 100.0 to 400.0 ppt (g/L)	±1 % of reading or ±1 ppm (mg/L), whichever is greater	Based on conductivity or salinity calibration
  Salinity	0.00 to 70.00 PSU	0.01 PSU	±2 % of reading or ±0.01 PSU, whichever is greater	One point using a custom solution
  Seawater Sigma	0.0 to 50.0 σt, σ0, σ15	0.1 σt, σ0, σ15	±1.0 σt, σ0, σ15	Based on conductivity or salinity calibration
  Turbidity	0.0 to 99.9 FNU 100 to 1000 FNU	0.1 FNU from 0.0 to 99.9 FNU 1 FNU from 100 to 1000 FNU	±0.3 FNU or ±2 % of reading, whichever is greater	Automatic, up to three points using 0 FNU, 20 FNU, 200 FNU, or a custom solution

  
  

  Parameter	Range	Resolution	Accuracy	Calibration
  Atmospheric Pressure	450.0 to 850.0 mmHg 17.72 to 33.46 inHg 600.0 to 1133.2 mbar	0.1 mmHg 0.01 inHg 0.1 mbar	±3.0 mmHg within ±15 °C from calibration temperature	Automatic at a custom point
  Temperature	−5.00 to 50.00 °C 23.00 to 122.00 °F 268.15 to 323.15 K	0.01 °C 0.01 °F 0.01 K	±0.15 °C ±0.27 °F ±0.15 K	Automatic at a custom point
  Temperature Compensation		Automatic
  Logging Memory		Interval logging: 50000 records On-demand logging (all parameters): 20000 records
  Logging Interval		From 1 second to 3 hours
  USB-C Functions (Host)		Mass storage host
  USB-C Functions (Device)		Mass storage device
  Protection	IP67
  Environment	0 to 50 °C (32 to 122 °F); RH 100 %
  Battery Type	4 AA 1.5 V alkaline batteries 1 internal rechargeable lithium-ion battery
  Battery Life	≈ 126 hours 90 hours using AA alkaline batteries 36 hours using lithium-ion battery**
  Dimensions	185 x 93 x 35.2 mm (7.3 x 3.6 x 1.4”)
  Weight	435 g (13.3 oz)

  
  

  HI7698594 Probe Specifications

  Sensor Inputs	3 (pH or pH/ORP, EC or EC/Turbidity, DO)
  Sample Environment	Fresh, brackish, and seawater
  Waterproof Protection	IP68
  Operating Temperature	−5.0 to 50.0 °C 23.0 to 122.0 °F
  Storage Temperature	−20.0 to 70.0 °C −4.0 to 158.0 °F
  Maximum Depth	20 m (66’)
  Dimensions (without cable)	Length: 342 mm (13.5”) Diameter: 46 mm (1.8”)
  Weight (without sensors)	570 g (20.1 oz)

• • HI7698594: Multisensor probe
  • HI7698296: Probe guard
  • HI76984942: Probe maintenance kit
  • HI7698194-1: pH/ORP sensor
  • HI7698594-4: EC/Turbidity sensor
  • HI7698594-5: Optical dissolved oxygen (DO) sensor
  • HI764113-1: Smart cap for DO with o-ring
  • HI7698293: Long calibration cup
  • HI9828-25: Quick calibration standard solution (500 mL)
  • HI7040: Zero oxygen solution set (120 mL)
  • HI9829-16: 0 FNU calibration solution (230 mL)
  • HI9829-17: 20 FNU calibration solution (230 mL)
  • HI9829-18: 200 FNU calibration solution (230 mL)
  • HI710034: Protective rubber cover
  • HI920016: USB cable
  • 1.5V AA alkaline batteries: 4 units
  • Quality certificates (instrument, probe, smart cap for DO)
  • Quick reference guide
• • None
• • None
• • HI98594 Manual
  • HI98594 Brochure
  • Technical Data Sheet