Pro20i Dissolved Oxygen Instrument

Model 55, Pro20, and Pro20i Dissolved Oxygen Meter Comparison

The YSI Model 55 dissolved oxygen handheld was an extremely popular meter for YSI customers. Since it's discontinuation we've launched a few models to easily replace the Model 55 with much better benefits. This video compares the Model 55 to its direct replacement - the YSI Pro20i (https://www.ysi.com/pro20i) - and reviews improvements and features of the Pro20i. The Pro20 (https://www.ysi.com/pro20) is also reviewed, although it has a user-replaceable cable unlike the Pro20i and Model 55.

Price$870.00 (US Only)

Option

SKU607130


In Stock 1

Dissolved oxygen and temperature handheld instrument with integral (i.e. non-detachable) cable.  The Pro20i is a direct replacement for the model 55 and 550A dissolved oxygen instruments. EPA approved for wastewater compliance reporting of DO.

Instrument, cables, probes/sensors included.

Take advantage of the Complete Solution promo going on now through December 31, 2019. Order a Pro20i system (handheld, cable, and sensor) and receive a case, shoulder strap, and membrane kit (any type) for FREE (US only). Use the code Pro20icomplete to receive your discount. Please see the ordering directions below for more detail!

  • Order Meter
    SKU Description Price Quantity
    607130 Handheld with 1-meter integral (non-detachable) cable and 2003 Polarographic sensor kit $870.00
    607131 Handheld with 1-meter integral (non-detachable) cable and 2002 Galvanic sensor kit $870.00
    607125 Handheld with 4-meter integral (non-detachable) cable and 2003 Polarographic sensor kit $890.00
    607129 Handheld with 4-meter integral (non-detachable) cable and 2002 Galvanic sensor kit $890.00
    607132 Handheld with 10-meter integral (non-detachable) cable and 2003 Polarographic sensor kit $940.00
    607133 Handheld with 10-meter integral (non-detachable) cable and 2002 Galvanic sensor kit $940.00
  • Order Accessories
    SKU Description Price Quantity
    605306 5908 - Replacement Standard Membrane Kit for 605203 Polarographic DO sensor $62.00
    603075 3075 - Pro Series Soft Sided Carrying Case $128.00
    603070 3070 - Shoulder strap $32.00
    605913 5913 - Replacement Standard Membrane Kit for 605202 Galvanic DO sensor $63.00
    603074 3074 - Pro Series Hard Sided Carrying Case $299.00
    603162 6262 - Pro Series Soft Sided Small Carrying Case $92.25
Add to Cart
  • Overview

    Easy to use, rugged and reliable, the YSI Pro20i provides everything you need in a handheld instrument for the measurement of dissolved oxygen. User-friendly and convenient calibration routine and 50 data set memory. A true field instrument with IP67 waterproof, rubber over molded case, and 1-meter drop tests ensure durability to provide years of sampling even in the harshest field conditions.

    Features Include:

    • Integral (i.e. built-in) cable with 1- 4- 10-m field cable; user-replaceable DO sensors
    • One Touch Cal allows for easy DO calibrations within 3 seconds with the press of a button. Automatic barometric pressure compensation.
    • Quick response times; 95% response time in approximately 8 seconds with standard membrane (fastest response time on the market)
    • Stores 50 data sets; no need to write down data
    • Large graphic, backlit display and glow in the dark keypad
    • A true field instrument - the display is visible when wearing polarized sunglasses
    • Tough. IP-67, impact-resistant, waterproof case. Waterproof with and without the battery cover
    • Rubber over molded case provides extra durability
    • Multiple languages: English, Spanish, French, and German
    • 3-year instrument; 2-year integral cable; 1-year polarographic sensors; 6-month galvanic sensor warranty

    The Pro20i features an integral cable, but the Pro20 features a user-replaceable (i.e. detachable) cable. Longer cables are also available for the Pro20, as is a BOD probe/cable assembly.

    How to Order a Pro20i Complete Solution Package:

    1. Add the following to your cart using the order tabs above:
      • Pro20i meter with cable (any length) and DO sensor (any type)
      • 5908 or 5913 membrane kit
      • Soft-sided case (603162)
      • Shoulder strap (603070)
    2. Apply the code Pro20icomplete to your order before checking out.

  • Specifications
    Cable Options 1- 4- 10-m lengths (3.28, 13.1, 32.8 ft.)
    Certifications RoHS, CE, WEEE, IP-67 waterproof, 1-meter drop test
    Languages English, Spanish, German, French
    Memory 50 data sets
    Power 2 alkaline C-cells providing ~400 hours of battery life (without backlight); low battery indicator when 1 hour is left
    Size

    8.3 cm width x 21.6 cm length x 5.6 cm depth (3.25 in. x 8.5 in. x 2.2 in.)

    Warranty

    3-year instrument; 2-year cable; 1-year polarographic sensors; 6-month galvanic sensors

    Weight 475 grams (1.05 lbs.) (with batteries)
  • Accessories

    Cap Membrane Kit 1.25 Mil PE

    Cap Membrane Kit 1.25 Mil PE (6 each), Polarographic, includes electrolyte (yellow cap)

    Pro Series Polarographic Dissolved Oxygen Sensor

    Polarographic DO Sensor with Yellow Membrane Kit

    Pro Series Galvanic Dissolved Oxygen Sensor

    Galvanic DO Sensor with Yellow Membrane Kit

    Cap Membrane Kit 1.25 Mil PE

    Cap Membrane Kit 1.25 Mil PE (6 each), Galvanic, includes electrolyte (yellow cap)

  • Video

    Model 55, Pro20, and Pro20i Dissolved Oxygen Meter Comparison

    The YSI Model 55 dissolved oxygen handheld was an extremely popular meter for YSI customers. Since it's discontinuation we've launched a few models to easily replace the Model 55 with much better benefits. This video compares the Model 55 to its direct replacement - the YSI Pro20i (https://www.ysi.com/pro20i) - and reviews improvements and features of the Pro20i. The Pro20 (https://www.ysi.com/pro20) is also reviewed, although it has a user-replaceable cable unlike the Pro20i and Model 55.

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