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YSI ProPlus Multiparameter

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The YSI Professional Plus is a universal handheld multiparameter meter providing extreme flexibility for the measurement of a variety of combinations for dissolved oxygen, conductivity, specific conductance, salinity, resistivity, total dissolved solids (TDS), pH, ORP, pH/ORP combination, ammonium (ammonia), nitrate, chloride and temperature. Also a very powerful lab instrument for BODs, pH and ORP.

This product has received the EA's MCERTS Certification
This product is RoHS Compliant
YSI Professional Plus Instrument in the Lab with Lab-Grade pH Sensor

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The Quatro cable attached to the Pro Plus allows you to utilise 4-ports to measure temperature/conductivity, DO, and any two ISEs among pH, ORP, ammonium, chloride, or nitrate creating an extremely powerful handheld multiparameter instrument.

The Pro Plus instrument meets the demands of true field work. The instrument is rated to IP-67 standards even without the battery cover on. Other tough features include a 3-year warranty, Mil-spec connectors, rubber overmoulded case, and a 2-year cable warranty. In-house testing procedures also include 1-meter drop tests from all angles to ensure expected field-durability.

Tough, Field Durability Features Include:

  • Easy-to-install cable weights; can be daisy-chained for additional weight*
  • Rubber, over-molded IP-67 waterproof case (even without the battery cover)*
  • 3-year instrument warranty
  • 2-year cable warranty*
  • Rugged cables, sensors, and military-spec connectors*
  • Drop-tested 1 meter at all angles*
  • Scratch-resistant lens; viewable with polarized glasses
  • Instrument floats
  • Weighted, user-replaceable multi-sensor design

The instrument provides numerous benefits from the following features; 5,000 data-set memory, password protection, backlit display and keypad, graphic display with detailed Help functionality, re-cal prompts, user defined fields, detailed GLP, auto stable, Hold All Readings function, Data Manager software for the desktop, USB connection, auto-buffer recognition, and flexible folders and site lists for logging data.

Smart Features Include:

  • 5,000 data set memory
  • Detailed on-screen Help function*
  • Free, Data Manager desktop software and ProComm II saddle*
  • Interval or single-event logging
  • 100 folder & site list data structure*
  • Password protection
  • Detailed GLP data
  • USB connection also powers the instrument
  • 6-point cal with auto-buffer recognition*
  • User-adjustable auto-stable with prompts*
  • User-upgradeable software via waterproof USB port
  • Recalibration prompts
  • Search function filters user-defined data information*
  • Backlit dispaly AND keypad*
  • Cable management kit included with all cables from 4- to 30-meters*

Most Versatile
Connect any Professional Series cable (excludes ODO cables) and probe option to the instrument and use the convenient cable management kit to keep everything simple and organised. Cable options range from 1-, 4-, 10-, 20-, and 30-meter choices (up to 100-meters on DO only cables). Use lab or field probes and switch between the two quickly. The Pro Plus makes an ideal lab BOD instrument with the proven self-stirring BOD probe. A convenient handstrap can be used on either side of the instrument. A complete family of accessories also increases the versatility of the Pro Plus. Choose among accessories including carrying cases, flow cells, cable weight, belt clip, tripod, and c-clamp.

Added Versatility Features Include:

  • Adjustable right- or left-handed hand strap*
  • Multiple user-replaceable sensor options and a choice of DO sensors*
  • Multiple parameter options and cable lengths
  • Lab-grade ISE sensors and BOD probe available to make a true lab/field instrument
  • Languages - English, Spanish, German, French, Italian, Norwegian, Portuguese, Japanese, Chinese (Simplified and Traditional)
  • Wide array of accessories are available from flow cells, to shoulder straps, to carrying cases

Free - Data Manager
Data management can become a daunting task over time but with the Data Manager software this task is much simpler and efficient. Download data, configure instruments, and conduct real-time studies easily with Data Manager software. View data graphically or in tabular form and export data as needed to other programs. Data Manager software is a very powerful tool. So powerful in fact, that we give it to you at no charge when purchasing a Pro Plus. After all, it's all about the data!

When purchasing the Pro Plus you will receive the instrument, manual, batteries, communications saddle, USB cable, and Data Manager software. Cables and probes are ordered separately.

* feature or benefit only YSI offers on a handheld instrument.


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Specification Sheets

Professional Plus


Professional Plus Instrument General Specifications

Auto Stable User-defined auto-stable function holds stable readings on display when criteria is met
Barometer Built-in barometer
Buffer Recognition Auto buffer recognition for US and NIST buffers
Certifications RoHS, CE, WEEE, C-Tick, VCCI, FCC, IP-67, 1-meter drop test, Assembled in USA
Connectivity USB 2.0; ProComm II communications saddle and USB cable included; user-upgradeable software via USB and website
Connector MS (military spec) waterproof with bayonet lock
Data Management Data Manager desktop software included; 100 user-defined folders and site names
Data Memory 5,000 data sets (data, date, time, user-defined info); 100 GLP files
Dimensions 8.3 cm width x 21.6 cm length x 5.6 cm depth (3.25 in x 8.5 in x 2.21 in)
Display Graphic display with detailed Help; backlit display AND keypad
DO Membrane Response Times
(T95; 100%-0) and Flow Dependence
1.25 mil PE = 8 seconds and 6 in/sec flow
2.0 mil PE = 17 seconds and 3 in/sec flow
1 mil Tefl on® = 18 seconds and 12 in/sec flow
DO Sensors Polarographic or galvanic field sensors; self-stirring polarographic BOD sensor for the lab
Field Cables Standard lengths of 1, 4, 10, 20, or 30 meters - up to 100 meters on DO only cables; 4- through 30-meter cables include a cable management kit
Flow Cell Single, dual and multiparameter Quatro cable all flow cell compatible
GLP Compliance Yes; detailed GLP information is stored and is available to view, download or print
Lab Cables BOD sensor includes 2-meter cable; 1 or 4 meters on lab pH, ORP and pH/ORP cables
Languages English, Spanish, German, French, Italian, Norwegian, Portuguese, Japanese, Chinese (Simplified & Traditional)
Logging Modes Single or Continuous
Operating Temperature -10 to 60°C
Power 2 alkaline C-cells provide 80 continuous hours at ambient temperature without backlight; ProComm II saddle provides USB power or optional wall power, cigarette lighter, and universal cell phone charger options
Storage Temperature -20 to 70°C
User ID Optional user ID for data security
Warranty 3-year instrument; 2-year field cables
Waterproof IP-67 (even with the battery cover off); floats
Weight with Batteries 475 grams (1.05 lbs)


Professional Plus System Specifications (Cables & Sensors)

Sensor Type Range Accuracy Resolution Units Calibration
Dissolved Oxygen (%)
(temp comp range -5 to 45°C)
Polarographic or Galvanic 0 to 500% 0 to 200%
(± 2% of reading or 2% air saturation, whichever is greater)
200% – 500% (± 6% of reading)
1% or 0.1% air saturation
(user selectable)
% 1 or 2-points with zero
Dissolved Oxygen (mg/L)
(temp comp range -5 to 45°C)
Polarographic or Galvanic 0 to 50 mg/L 0 to 20 mg/L
(± 2% of reading or 0.2 mg/L, whichever is greater)
20 – 50 mg/L (± 6% of reading)
0.1 or 0.01 mg/L (user selectable); 0.1% air saturation mg/L, ppm 1 or 2-points with zero
(Field rugged cables)
-5 to 70°C ±0.2°C (±0.3°C cables over 45-meters) 0.1°C °C, °F, K
0 to 40°C ±0.35°C 0.1°C °C, °F, K
Conductivity** Four electrode cell 0 to 200 mS/cm
(auto range)
±0.5% of reading or 0.001 mS/cm, whichever is greater (4-m cable) ±1% of reading or 0.001 mS/cm, whichever is greater (20-m cable) 0.001 mS/cm to 0.1 mS/cm (range dependent) µS, mS 1 point
Salinity Calculated from conductivity and temperature 0 to 70 ppt ±1.0% of reading or 0.1 ppt, whichever is greater 0.01 ppt ppt, PSU 1 point
pH Glass Combination Electrode 0 to 14 units ±0.2 units 0.01 units mV, pH units 1, 2, 3, 4, 5, or 6 point (user selectable); US, NIST or Custom Buffers
ORP Platinum button --1999 to +1999 mV ±20 mV in redox standards 0.1 mV mV 1 point
(ammonia with pH sensor)
Ion Selective Electrode 0 to 200 mg/L-N, 0 to 30°C ±10% of reading or 2 mg/L-N, whichever is greater 0.01 mg/L mg/L-N, mV 1, 2, or 3 point
(user selectable)
Nitrate*** Ion Selective Electrode 0 to 200 mg/L-N, 0 to 30°C ±10% of reading or 2 mg/L-N, whichever is greater 0.01 mg/L mg/L-N, mV 1, 2, or 3 point
(user selectable)
Chloride*** Ion Selective Electrode 0 to 1000 mg/L, 0 to 40°C ±15% of reading or 5 mg/L, whichever is greater 0.01 mg/L mg/L-Cl-, mV 1, 2, or 3 point
(user selectable)
Total Dissolved Solids (TDS) Calculated from conductivity and temperature 0 to 100 g/L TDS constant range 0.30 to 1.00 (0.64 default) 0.001, 0.01, 0.1g/L kg/L, g/L
Barometer Piezoresistive 375 to 825 mmHg ±1.5 mmHg from 0 to 50°C 0.1 mmHg mmHg, inHg, mbar, psi, kPa, ATM 1 point
Instrument Only Specifications (at Ambient Temperature)
pH -2.60 to 16.60 ±0.1 mV (0.01 pH units) 0.1 mV (0.01 pH units)
ORP -1999 to +1999 mV ±0.5 mV 0.1 mV
Conductivity 0.0 to 200 mS/cm each range ±0.1% FS ±1 digit for µS/cm to 0.1 mS/cm (range dependent) 0.0001 mS/cm or 0.1
Dissolved Oxygen 0.00 to 90 mg/L; 0 to 550% ±0.2% FS (550% air saturation) ±1 digit (with 1.25 PE membrane at 10°C) 0.01 mg/L; 0.1% air saturation
Temperature -10 to 100.00°C ±0.2% FS ±1 digit 0.1°C °C, °F, K

*Lab-grade cables include 605107, -108, -109, 605177, -178, -179
** Derived parameters can include resistivity, salinity, specifi c conductance, and total dissolved solids
***ISE sensors for freshwater only; 17-meter maximum depth


Ordering Guide

Step 1: Order Instrument
Item # Description
6050000 Instrument, includes Data Manager software, the ProComm II communications saddle, and USB cable
Step 2: Order Cable(s)
All cables include temperature; cables 4- through 30-meters include cable management kit; cables with conductivity include sensor (no need to order conductivity sensor)
60510 1, 4, 10, 20 or 30 meter: ISE1/temp
60520 1, 4, 10, 20, 30 or up to100 meters2: DO/temp
60530 1, 4, 10, 20 or 30 meter: conductivity/temp
6051010 1, 4, 10, 20 or 30 meter: ISE/ISE/temp
6051020 1, 4, 10, 20 or 30 meter: ISE/DO/temp
6051030 1, 4, 10, 20 or 30 meter: ISE/conductivity/temp
6052030 1, 4, 10, 20 or 30 meter: DO/conductivity/temp
605790 1, 4, 10, 20 or 30 meter: ISE/ISE/DO/conductivity/temp
605107 1–meter single junction pH sensor & cable
605177 4–meter single junction pH sensor & cable
605108 1–meter single junction ORP sensor & cable
605178 4–meter single junction ORP sensor & cable
605109 1–meter single junction pH/ORP sensor & cable
605179 4–meter single junction pH/ORP sensor & cable
Step 3: Order Sensor(s)
605202 Galvanic DO
605203 Polarographic DO
605780 Self-stirring BOD (2-meter cable included)
605101 pH (ISE)
605102 ORP (ISE)
605103 pH/ORP combination (ISE)3
605104 Ammonium (ISE)
605105 Chloride (ISE)
605106 Nitrate (ISE)
1 ISEs include pH, ORP, Ammonium, Nitrate, Chloride
2 Special order cables in 10-meter increments up to 100 meter available
3 Not recommended on 6051010 or 605790 cables. Only pH would appear.




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