Professional Plus (Pro Plus) Multiparameter Instrument

5 Reasons to Upgrade from Pro Plus to ProQuatro

Since 2006, the Professional Plus has set the industry standard for water quality sampling, but the time has come for us to say farewell and move toward the future. Now, as the 2021 field season approaches, we are excited to crown the ProQuatro, YSI’s latest handheld in the Professional Series line, as the new successor to the Pro Plus throne.

PriceDiscontinued

SKU6050000


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The YSI Professional Plus handheld has been discontinued as of March 31, 2021. The direct replacement is the ProQuatro multiparameter handheld. See the FAQ tab below or visit the ProQuatro page for more information.

The Pro Plus multiparameter meter provides 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.

EPA approved for drinking water and wastewater compliance reporting.

Instrument Only.  Cables, probes/sensors, and accessories sold separately.

  • Overview

    Learn more about ProQuatro, the replacement to Pro Plus.

    The Quatro cable attached to the Pro Plus allows you to utilize 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.

    Toughest
    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 overmolded 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

    Smartest
    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 display 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 organized. 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 (EPA Approved). 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.

    YSI now offers an Extended Warranty for the Pro Plus (new instruments only).

    Please visit the Professional Plus Kits page for fully assembled systems.

    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 - Watch the Data Manager Demo Video
    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.

  • Specifications
    Autostable User-defined auto-stable function holds stable readings on display when criteria is met
    Certifications RoHS, CE, WEEE, C-Tick, VCCI, FCC, IP-67 (waterproof), 1-meter drop test, Assembled in USA
    Connectivity / Communications USB 2.0 for data transfer and user-upgradeable instrument firmware. Communications saddle, USB cable and Data Manager software included
    Connector Metal MS (military spec) waterproof with bayonet lock
    Data Management

    5000 data set memory in Pro Plus with 100 user-defined sites and site names. Data Manager desktop software included

    Desktop Software Compatible Data Manager desktop software included. Minimum PC requirements - Windows 2000 with SP4 (minimum) or XP with SP2 (minimum), Vista 7 or Windows 8 | 300 MHz or higher Pentium-compatible CPU | 128 MB of RAM or higher | 80 MB or more of free hard-disk space
    Digital / Digital Sensors No, the Pro Plus is an analog instrument
    GLP Compliance Yes, detailed GLP information is stored and is available to view, download or print
    Graphic Display Graphic display can be seen in any lighting condition and with polarized glasses | Backlit display AND keypad | Includes detailed on-board Help
    Languages English, Chinese (Simplified and Traditional), Italian, Japanese, French, German, Portuguese, Spanish, Norwegian
    Logging Capabilities Single or Continuous
    Memory 100 GLP files, 5,000 data sets (data, date, time, user-defined info)
    Multiparameter Yes
    Operating Temperature -10 to 60°C
    Parameters Measured Temperature, Dissolved Oxygen, pH, ORP/Redox, Conductivity, TDS, Ammonia, Ammonium, Nitrate, Chloride,Built-in barometer
    Power ProComm II saddle provides USB power or optional wall power, cigarette lighter, and universal cell phone charger options, 2 alkaline C-cells provide 80 continuous hours at ambient temperature without backlight
    Sampling Yes
    Storage Temperature -20 to 70°C
    Unit of Measure Conductivity-mS/cm, Barameter-mmHg, pH-units, Chloride-mg/L, Salinity-ppt, ORP-mV, Temperature- °C, mg/L, air saturation, Nitrate-mg/L-N, Dissolved Oxygen-%, Total Dissolved Solids(TDS)-g/L, Ammonium-mg/L-N, °F
    User Calibratable Yes
    User Replaceable Yes, cables and most sensors are user-replaceable
    Warranty 3-year instrument; 2-year field cables
    Waterproof IP-67 (even with the battery cover off and cable disconnected), floats

    Professional Plus Instrument General Specifications

    Specification  
    Barometer Built-in barometer
    Buffer Recognition Auto buffer recognition for US and NIST buffers
    Cables: Field 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
    Cables: Lab BOD sensor includes 2-meter cable; 1 or 4 meters on lab pH, ORP and pH/ORP cables
    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)
    DO Membrane Response Times (T95; 100%-0) and Required Flow Rate 1.25 mil PE = 8 seconds and 6 in/sec flow
    2.0 mil PE = 17 seconds and 3 in/sec flow
    1 mil Teflon® = 18 seconds and 12 in/sec flow
    DO Sensors Polarographic or galvanic field sensors; self-stirring polarographic BOD sensor for the lab
    Flow Cell Single, dual and multiparameter Quatro cable all flow cell compatible
    User ID Optional user ID for data security
    Weight 475 grams (1.05 lbs)

     

    Professional Plus System Specifications (Instrument, Cables & Sensors)

    Parameter
    (units)
    Sensor Type Range Accuracy Resolution Calibration
    Ammonium*
    (mg/L-N mV)
    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 1, 2, or 3 point
    (user selectable)
    Barometer
    (mmHg, inHg, mbar, psi, kPa, ATM)
    Piezoresistive 375 to 825 mmHg ±1.5 mmHg from 0 to 50°C 0.1 mmHg 1 point
    Chloride*
    (mg/L-Cl-, mV)
    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 1, 2, or 3 point
    (user selectable)
    Conductivity**
    (µS, mS)
    Four Electrode Cell 0 to 200 mS/cm (auto-range) 1 m, 4 m cables:
    ±0.5% of reading or 0.001 mS/cm, whichever is greater
    20 m cable:
     ±1% of reading or 0.001 mS/cm, whichever is greater 

    Range dependent

    0 to 0.500 mS/cm: 0.001
    0.501 to 50.00 mS/cm: 0.01
    50.01 to 200 mS/cm: 0.1

     

    1 point

    Dissolved Oxygen
    (% saturation)
    temp comp range -5 to 50°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
    0.1% or 1% air saturation (user selectable) 1 or 2-points with zero
    Dissolved Oxygen
    (mg/L, ppm)
    temp comp range -5 to 50°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 1 or 2-points with zero
    Nitrate*
    (mg/L-N mV)
    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 1, 2, or 3 point
    (user selectable)
    ORP
    (mV)
    Platinum Button -1999 to +1999 mV ±20 mV in redox standards 0.1 mV 1 point
    pH
    (mV, pH units)
    Glass Combination Electrode 0 to 14 units ±0.2 units 0.01 units 1, 2, 3, 4, 5, or 6 point (user selectable); US, NIST or Custom Buffers
    Salinity
    (ppt, PSU)
    Calculated from Conductivity and Temperature 0 to 70 ppt ±1.0% of reading or ±0.1 ppt, whichever is greater 0.01 ppt 1 point

    Temperature
    Field-rugged cables
    (°C, °F, K)

    Thermistor  -5 to 70°C (23 to 158°F)
    ±0.2°C; 
    ±0.3°C cables over 45-meters
    0.1°C None
    Temperature***
    Lab-grade cables​
    (°C, °F, K)
    Thermistor  0 to 40°C (32 to 104°F) ±0.35°C 0.1°C None
    Total Dissolved Solids (TDS)
    (mg/L, kg/L, g/L)
    Calculated from Conductivity and Temperature 0 to 100 g/L; TDS constant range 0.30 to 1.00 (0.65 default) - 0.001, 0.01, 0.1g/L -

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

  • Accessories

    Pro Series Laboratory pH/ORP Sensor

    pH, ORP, and temperature single junction combination electrode with cable and MS connector

    Pro Series pH/ORP/ISE and DO Field Cable

    YSI 1020 Cable - pH/ORP/ISE, temperature, and dissolved oxygen cable assembly

    Nitrate Standard

    Nitrate Standard

    Pro Series pH/ORP/ISE Field Cable

    YSI 10 Cable - pH/ORP/ISE and temperature cable assembly

    Pro Series 1005 Chloride ISE Sensor

    YSI 1005 Chloride ISE sensor for the Pro Series

    Pro Series BOD Probe

    Self-stirring BOD probe for use with the Pro20 and Pro Plus

    5580 Confidence Solution (case of 6 pints)

    5580 Confidence Solution (case of 6 pints)

    pH Buffer

    pH Buffer

    Pro Series Laboratory Grade ORP (Redox) Sensor

    ORP and temperature single junction combination electrode with cable and MS connector

    Pro Series Polarographic Dissolved Oxygen Sensor

    YSI 2003 Polarographic Dissolved Oxygen sensor for the Pro Series (Yellow Membrane Kit)

    Pro Series 1004 Ammonium ISE, NH4+ Sensor

    YSI 1004 ammonium, NH4+ sensor for the Pro Series

    Conductivity Calibrator Solution

    Conductivity Calibrator Solution

    Pro Series pH/ORP/ISE and Conductivity Field Cable

    YSI 1030 Cable - pH/ORP/ISE, temperature, and conductivity cable assembly

    Pro Series 1002 ORP Sensor

    YSI 1002 ORP (redox) sensor for the Pro Series

    Pro Series Conductivity Field Cable

    YSI 30 Cable - Conductivity and temperature cable assembly

    Pro Series Dissolved Oxygen/Temperature Field Cable

    YSI 20 Cable - DO and temperature cable assembly

    Ammonium Standard

    Ammonium Calibration Solution

    Cap Membrane Kit 1.00 Mil Teflon

    Cap Membrane Kit 1.00 Mil Teflon (6 each), includes electrolyte (black cap)

    Extended Warranty Professional Plus (Pro Plus)

    One Year Extended Product Warranty for Pro Plus

    Pro Series Dual pH/ORP/ISE Field Cable

    YSI 1010 Cable - Dual pH/ORP/ISE and temperature cable assembly

    Pro Series Galvanic Dissolved Oxygen Sensor

    YSI 2002 Galvanic Dissolved Oxygen sensor for the Pro Series

    Pro Series 1006 Nitrate ISE Sensor

    YSI 1006 Nitrate ISE for the Pro Series

    Pro Series 1001 pH Sensor

    pH sensor for the YSI Professional Series

    Cap Membrane Kit 1.00 Mil Teflon

    Cap Membrane Kit 1.00 Mil Teflon (6 each), includes electrolyte (black cap)

    Pro Series Laboratory Grade pH Sensor

    pH and temperature single junction combination electrode with cable and MS connector

    Pro Series DO/Conductivity Field Cable

    YSI 2030 Cable - DO, conductivity, and temperature cable assembly

    Pro Series Quatro Field Cable

    4-port Quatro Cable - Dissolved Oxygen, Conductivity/Temperature, and Dual ISE cable assembly.

    Pro1003A Amplified pH/ORP Combo Sensor

    1003A Amplified pH/ORP Combo Sensor

    Pro1001A Amplified pH Sensor

    1001A Amplified pH Sensor

    Pro1001A Amplified pH Sensor Kit

    1001A Amplified pH Sensor Kit*

    Zobell Solution, ORP Calibrator

    Zobell Solution, ORP Calibrator

  • FAQs

    Pro Plus Discontinuation FAQ

    1.  Why are you discontinuing the Professional Plus?

    The Professional Plus, or as most call it the Pro Plus, has been an industry leading multiparameter meter for over 10 years. Since that time, technology has changed for the better and while the Pro Plus was able to keep up, some of the components that go into the meter have become obsolete. Instead of sourcing rare components and raising prices, we decided it was time for an upgrade. Goodbye Pro Plus, hello ProQuatro.

    2.  I just purchased a Pro Plus, should I return it?

    No, the Pro Plus is still a fantastic instrument! There is nothing wrong with the Pro Plus but, as stated above, it’s simply not sustainable to keep manufacturing them. You will still be able to collect the highest quality data and endure the toughest conditions with your Pro Plus. And you can continue to buy cables, sensors, and consumable parts.

    3.  Can I still have my Pro Plus serviced?

    Yes you can. We will continue to support Pro Plus instruments until March 2026. This includes service and repair parts. We will also be honoring all warranties so we’ve got your back for 3 years after the purchase date.

    4.  Is there a direct replacement for the Pro Plus?

    The ProQuatro was released last year as a replacement for the Pro Plus. For the most part, the two instruments are the same. They accept the same cables and sensors and are built to the same level of quality and robustness. ProQuatro also has many of the loved features the Pro Plus had including:

    • 5,000 data set memory
    • Interval or single-event logging
    • Backlit display AND keypad
    • Rubber, over-molded IP-67 waterproof case (even without the battery cover)
    • Rugged cables, sensors, and military-spec connectors

    As well as many more that cant be listed here. See the ProQuatro Product page for more information.

    5.  Do my old cables and sensors work with ProQuatro?

    Absolutely! We want to make the transition from Pro Plus to ProQuatro as smooth as possible so the ProQuatro was been to designed to work with all Pro Series cables and sensors just like the Pro Plus. If you are replacing your handheld with a ProQuatro, you don’t need to replace anything else in your setup if it’s still in good working order.

    6.  What makes the ProQuatro different from the Pro Plus?

    ProQuatro and the Pro Plus are very similar by design, however there are a few key differences:

    • New microUSB port allows for on-the-go data transfer directly to a flash drive
    • Removal of the onscreen "Help" feature
    • "Data ID" replaces the "Site Folder"

    The addition of the USB port makes the ProQuatro one of the smartest instruments in the Pro Series. Now users can simply upload their data directly to a flash drive for easy access in the field or the lab.

    7.  Can I still use the Data Manager?

    You can still use the Data Manager software with a Pro Plus instrument. The new ProQuatro will not ship with this software and is not designed to interface with it. Instead, data is downloaded to a flash drive (included with purchase) via the USB port.

  • How to Order

    Step 1: Order Instrument

    SKU Description
    6050000 Instrument, includes Data Manager software, the ProComm II communications saddle, and USB cable

    Step 2: Order Cable(s)

    SKU Description
    60510 1, 4, 10, 20 or 30 meter: ISE*/temp
    60520 1, 4, 10, 20, 30 or up to100 meters**: 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)

    SKU Description
    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)***
    605104 Ammonium (ISE)
    605105 Chloride (ISE)
    605106 Nitrate (ISE)

    * ISEs include pH, ORP, Ammonium, Nitrate, Chloride
    ** Special order cables in 10-meter increments up to 100 meter available
    *** Not recommended on 6051010 or 605790 cables. Only pH would appear.

  • Video

    5 Reasons to Upgrade from Pro Plus to ProQuatro

    Since 2006, the Professional Plus has set the industry standard for water quality sampling, but the time has come for us to say farewell and move toward the future. Now, as the 2021 field season approaches, we are excited to crown the ProQuatro, YSI’s latest handheld in the Professional Series line, as the new successor to the Pro Plus throne.

  • Reviews
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