Underwater Temperature Logger with
Infrared (IR) Communication Port

Features and Specifications

• Accuracy: ±0.2°C at 0° to +50°C (±0.36°F at +32° to +120°F)
• 12 bit resolution
• Measurement ranges †: 0° to +50°C (+32° to +122°F) in water (non-freezing), and -20° to +70°C (-4° to +158°F) in air
• Response time: 5 minutes in water, 12 minutes in air (typical to 90%)
• Capacity: 21,580 measurements, 32 kilobytes total nonvolatile EEPROM memory
• Rugged streamlined case design will withstand years of use in challenging conditions
• Near neutral buoyancy for stability in flowing streams
• Waterproof to 100 feet
• Optional protective boot available for especially harsh conditions
• Infrared communications port is opposite of the attachment end for easy launch and readout while deployed
• Blinking LED confirms operation, but may be turned off to reduce logger visibility
• Offload data, check logger and battery status while logging
• Readout and relaunch in the field with IR port and HandCar^® 1.1 (available mid-2002)
• High-speed infrared (IR) communications offloads full logger in less than 30 seconds
• Programmable start time/date
• User-selectable sampling interval: 1 second to 9 hours, recording times up to several years
• Memory modes: Stop when full or Wrap-around when full
• Real time clock: ±1 minute per month
• 6 year factory replaceable battery (typical use*, temperature extremes will reduce battery life)
• Small size: 4.5" long x 1.19" diameter with .25" mounting hole, 1.5 oz
• Precision components eliminate the need for user calibration
• NIST-traceable temperature accuracy certification (initial certification included)

*16 three-month deployments in water (+35°F to +80°F) with 4 minute or longer intervals (no multiple sampling)

Measurement specifications

			Temperature Accuracy and Resolution HOBO Water Temp Pro
•	Range: 0° to +50°C (+32° to +122°F) in water (non-freezing), and -20° to +70°C (-4° to +158°F) in air
•	Accuracy: ±0.2°C (±0.36°F) at 0° to +50°C, see plot at right
•	Resolution: 0.02°C at +25°C (0.36°F at +77°F), see plot at right
•	Response time in water: 5 min. typical to 90%
•	Response time in air: 12 min. typical to 90% in air moving 2 m/second

HOBO Water Temp Pro Protective Boot The optional protective boot is designed for particularly harsh conditions. The thermoplastic elastomer boot is available in black to minimize visibility underwater or white for minimum solar radiation absorption. Protective boot shown installed on a HOBO Water Temp Pro.

Ordering Information

Note: Full operation of the HOBO Water Temp Pro requires the use of BoxCar Pro 4.3 for Windows or later software and an Onset Infrared (IR) Base Station. The IR Base Station requires a serial port in the PC. External USB Converters do not work.

Optionally the Water Temp Pro can be offloaded and relaunched with HandCar 1.1 on a Palm™ handheld. HandCar^® version not available until Mid-2002 - Call to confirm current availability