Nautilus 85 | Single-channel, waterproof temperature data loggers with 3 to 10-year battery life | ACR Systems
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Nautilus 85

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Single-channel, waterproof temperature data loggers with 3 to 10-year battery life
Nautilus 85 - Aluminum (01-0261)

Single channel, 8 bit, 32 KB data logger (One 85°C (185°F) temperature channel - extreme environmental and pressure resistant aluminum enclosure).


The Nautilus85 is a durable, robust data logger that can monitor temperature in a variety of applications and is particularly well suited for the food and beverage, biomedical, pharmaceutical industries. As well as industries with hostile or "wet" environments (i.e. wastewater treatment plant). Housed in a stainless steel or aluminum casing, it can withstand virtually any environment and with an operating pressure range up to 2000 PSI, it is ideal for monitoring temperature in any type of water including oceans, ponds, rivers, streams and wastewater.

The Nautilus Series consists of two full-featured, single-channel temperature loggers designed for "wet" environments at varying temperature ranges - from oceans, streams, and wastewater to food and other liquids, Ideal for rugged applictions, Nautilus loggers come in stainless steel or aluminum and offer a high temperature option for environments where conventional loggers are unable to survive

Key Features

  • Widest temperature range supported across series (-40°C to 135°C or -40°F to 275°F)
  • 32KB memory for up to 244,800 readings with data compression
  • Compact, cylindrical design for the narrowest applications (e.g. in bottles)
  • Lightweight with stainless steel and aluminum case material options
  • 3 to 10-year battery life (depending on model)
  • 3-year warranty


Size 18 mm x 127 mm (0.71" x 5.00")
Weight Aluminum case: 51 grams (1.8 ounces)
Stainless steel case: 112 grams (4 ounces)
Case Material Anodized aluminum or stainless steel
Operating Limits See individual specifications
Operating Pressure Range Up to 2000 PSI
Clock Accuracy +/- 2 seconds per day
Battery 3.6 volt Lithium, 0.95 Amp-Hour
Power Consumption 5 to 10 microamps (continuous)
Battery Life See individual specifications
Mounting Locking hole on cap
Memory Size 32 KB (up to 244,800 readings with data compression)
Sampling Methods 1. Continuous (First-in, First-out)
2. Stop when full (Fill-then-stop)
(Option to delay start)
Sampling Rates User selectable from 8 seconds to 34 minutes
Readings stored to memory can be spot or averaged over the sample interval (except for the 8 second interval)
Resolution 8-bit (1 part in 256)
PC Requirements Windows PC with a least 256MB RAM, 250MB of hard drive space and one free serial or USB port
Software Requirements TrendReader® Express or TrendReader® (compatible with Windows 7, Windows 8 & Windows 10)
Temperature Range -40°C to 85°C (-40°F to 185°F)
Sensor Accuracy ± 0.2°C over the range of 0 to 70°C (± 0.3°F over the range of 32 to 158°F)
Sensor Type Negative temperature Coefficient (NTC) Thermistor
10,000 ohms @ 25°C (77°F)