YSI Pro20i Specifications

SPECIFICATIONS

DOCUMENT #W55

YSI Pro20i Dissolved Oxygen/Temperature

Portable Dissolved Oxygen Meter for the Field

Easy to use, rugged and reliable, the YSI Pro20i provides
everything you need in a handheld instrument for the
measurement of dissolved oxygen (DO). A true field instrument
with IP-67 waterproof, rubber over molded case, military spec
connectors and 1-meter drop tests ensure durability to provide
years of sampling even in the harshest field conditions.

With the Pro20i, accuracy is not compromised for ruggedness.
The Pro20i can easily be calibrated for fast, accurate
measurements you can trust.

• Integral (i.e. built-in) cable with 1- 4- 10-m field cable

Parameters:

Dissolved Oxygen

(DO%, DO% Local, ppm and mg/L)

Temperature
(°C, °F)
Barometric Pressure
(mmHg, inHg, mbar, psi, kPa)

• 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; T-95 response time in 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,

visible in any lighting condition

• Display is visible when wearing polarized sunglasses

• A true field instrument with IP-67, impact-resistant, waterproof

case. Waterproof with and without the battery cover.

• Rubber over molded, slip-proof case provides extra durability

• Multiple languages: English, Spanish, French, and German

• Warranty: 3-year instrument, 2-year integral cable, 1-year

polarographic sensors, 6-month galvanic sensor

YSI.com/pro20i

Pro20i System Specifications (Instrument, Probe, and Cable)

Temperature Range 23 to 131°F (-5 to 55°C) 0 to 45°C for DO compensation for mg/L

°C, °F Resolution 0.1°F (0.1°C)
Accuracy ±0.6°F (±0.3°C)

Dissolved Oxygen Range 0 to 500%

% Saturation Resolution 0.1% or 1% air saturation (user selectable)
% Local Accuracy 0 to 200% air saturation, ±2% of the reading or ±2% air saturation, whichever is greater;
200 to 500% air saturation, ±6% of the reading

Dissolved Oxygen Range 0 to 50 mg/L

mg/L Resolution 0.01 or 0.1 mg/L (user selectable)
ppm Accuracy 0 to 20 mg/L, ±2% of the reading or ±0.2 mg/L, whichever is greater;
20 to 50 mg/L, ±6% of the reading

Barometer Range 400 to 999.9 mmHg

mmHg, mbar, inHg, Resolution 0.1 mmHg
psi, kPa Accuracy ±5 mmHg within ±5°C temperature range from calibration point

Pro20i Additional Specifications

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.)
Weight with Batteries 475 grams (1.05 lbs.)
Power 2 alkaline C-cells providing ~400 hours of battery life (without backlight); low battery indicator when 1 hour is left
Cables 1- 4- 10-m lengths (3.28, 13.1, 32.8 ft.)
Warranty 3-year instrument; 2-year cable; 1-year polarographic sensors; 6-month galvanic sensors
Salinity Input Range 0-70 ppt; manual (automatically compensates for manual input value)
Data Memory 50 data sets
Languages English, Spanish, German, French
Certifications RoHS, CE, WEEE, IP-67 waterproof, 1-meter drop test
Country of Origin Instrument Assembled in the USA, cable and probe Made in the USA

Pro20i Ordering Information - Full range of accessories available at YSI.com/pro20i

607130 Pro20i-1 P Kit Dissolved Oxygen and Temperature handheld instrument with 1-meter integral cable and 2003 polarographic sensor kit
607131 Pro20i-1 G Kit Dissolved Oxygen and Temperature handheld instrument with 1-meter integral cable and 2002 galvanic sensor kit
607125 Pro20i-4 P Kit Dissolved Oxygen and Temperature handheld instrument with 4-meter integral cable and 2003 polarographic sensor kit
607129 Pro20i-4 G Kit Dissolved Oxygen and Temperature handheld instrument with 4-meter integral cable and 2002 galvanic sensor kit
607132 Pro20i-10 P Kit Dissolved Oxygen and Temperature handheld instrument with 10-meter integral cable and 2003 polarographic sensor kit
607133 Pro20i-10 G Kit Dissolved Oxygen and Temperature handheld instrument with 10-meter integral cable and 2002 galvanic sensor kit
605202 Galvanic Dissolved Oxygen sensor; 5913 (yellow cap) membrane kit included
605203 Polarographic Dissolved Oxygen sensor; 5908 (yellow cap) membrane kit included

YSI

1725 Brannum Lane, Yellow Springs, OH 45387
Tel [phone].897.4151 (US)
[e-mail]
@YSIinc
YSI.com

YSI is a registered trademark.
Specifications are subject to change. Please visit YSI.com to verify all specs.
©2016 YSI, a xylem brand
Printed in the USA. W55 November, 2016