Pro20i Dissolved Oxygen Meter

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$1,092.00 (US Only)

Option

SKU607130

In Stock 0 - Available for Backorder

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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.

Order Meter

SKU	Description	Price	Quantity
607130	Handheld with 1-meter integral (non-detachable) cable and 2003 Polarographic sensor kit	$1,092.00	* * *
607131	Handheld with 1-meter integral (non-detachable) cable and 2002 Galvanic sensor kit	$1,092.00	* * *
607125	Handheld with 4-meter integral (non-detachable) cable and 2003 Polarographic sensor kit	$1,118.00	* * *
607129	Handheld with 4-meter integral (non-detachable) cable and 2002 Galvanic sensor kit	$1,118.00	* * *
607132	Handheld with 10-meter integral (non-detachable) cable and 2003 Polarographic sensor kit	$1,185.50	* * *
607133	Handheld with 10-meter integral (non-detachable) cable and 2002 Galvanic sensor kit	$1,185.50	* * *

Order Accessories

SKU	Description	Price	Quantity
605306	5908 - Replacement Standard Membrane Kit for 605203 Polarographic DO sensor	$79.25	* * *
603075	3075 - Pro Series Soft Sided Carrying Case	$160.50	* * *
603070	3070 - Shoulder strap	$39.25	* * *
605913	5913 - Replacement Standard Membrane Kit for 605202 Galvanic DO sensor	$81.25	* * *
603074	3074 - Pro Series Hard Sided Carrying Case	$371.00	* * *
603162	6262 - Pro Series Soft Sided Small Carrying Case	$116.50	* * *

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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.

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), Galvanic, includes electrolyte (yellow cap)

Cap Membrane Kit 1.25 Mil PE

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

Pro Series Galvanic Dissolved Oxygen Sensor

YSI 2002 Galvanic Dissolved Oxygen sensor for the Pro Series

Pro Series Polarographic Dissolved Oxygen Sensor

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