Multiparameter (Pro Plus) (DO, pH, Cond, Temp, ORP, Ammonia, Ammonium, Nitrate, Chloride, Built-in barometer)

Available on backorder

Operating Temp: -10 to 60°C
Data Manag.: 5000 data set
Model.:Professional Plus
Brand: YSI
Country: USA



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.
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
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


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
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)


Parameter Unit Sonsor Type Range Accuracy Resolation Calibaration
Ammonium* 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
(mg/L-N mV) (user selectable)
ammonia with pH sensor
Barometer Piezoresistive 375 to 825 mmHg ±1.5 mmHg from 0 to 50°C 0.1 mmHg 1 point
(mmHg, inHg, mbar, psi, kPa, ATM)
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 1, 2, or 3 point
(mg/L-Cl-, mV) (user selectable)
Conductivity** Four Electrode Cell 0 to 200 mS/cm (auto-range) 1 m, 4 m cables: Range dependent 1 point
(µS, mS) ±0.5% of reading or 0.001 mS/cm, whichever is greater
20 m cable: 0 to 0.500 mS/cm: 0.001
 ±1% of reading or 0.001 mS/cm, whichever is greater 0.501 to 50.00 mS/cm: 0.01
50.01 to 200 mS/cm: 0.1
Dissolved Oxygen Polarographic or Galvanic 0 to 500% 0 to 200% : 0.1% or 1% air saturation (user selectable) 1 or 2-points with zero
(% saturation) ± 2% of reading or 2% air saturation, whichever is greater
temp comp range -5 to 50°C 200% – 500% :
± 6% of reading
Dissolved Oxygen Polarographic or Galvanic 0 to 50 mg/L 0 to 20 mg/L : 0.1 or 0.01 mg/L (user selectable); 0.1% air saturation 1 or 2-points with zero
(mg/L, ppm) ± 2% of reading or 0.2 mg/L, whichever is greater
temp comp range -5 to 50°C 20 – 50 mg/L :
± 6% of reading
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 1, 2, or 3 point
(mg/L-N mV) (user selectable)
ORP Platinum Button -1999 to +1999 mV ±20 mV in redox standards 0.1 mV 1 point
pH 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
(mV, pH units)
Salinity 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
(ppt, PSU)
Temperature Thermistor -5 to 70°C (23 to 158°F) 0.1°C None
Field-rugged cables ±0.2°C;
(°C, °F, K) ±0.3°C cables over 45-meters
Temperature*** Thermistor 0 to 40°C (32 to 104°F) ±0.35°C 0.1°C None
Lab-grade cables​
(°C, °F, K)
Total Dissolved Solids (TDS) 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
(mg/L, kg/L, g/L)


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