OWL 200 | Single-channel External Temperature Data Logger | ACR Systems
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OWL 200

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Single-channel External Temperature Data Logger
Owl 200 - External Temperature

Single channel, 8 bit, 32 KB data logger (One external temperature channel).


The OWL 200 data logger can record temperature or switch status in environments that typical data loggers cannot withstand. Since the OWL's temperature sensor is external, it can work in excessive heat while the logger remains in a cooler environment. Because of its small size, the OWL can also fit into tight spaces.

Our OWL Series consists of configurable, single-channel data loggers with flashing visual alarms, optical data transfer, and an industry-leading 10-year battery life.

Key Features

  • One channel with options to record temperature, electric current, voltage, or process current
  • 32KB memory for almost 33,000 readings
  • Configurable alarm thresholds and modes with super-bright red blinking annunciator  
  • Conformal coating protects electronics from harsh environments
  • Industry-leading 10-year battery life
  • 3-year warranty


Size 60 x 48 x 19 mm (2.4 x 1.9 x 0.7 in)
Weight 54 g / 1.9 oz (All models except OWL 100-Poly)
80 g / 2.8 oz (OWL 100-Poly water-resistant model)
Case Material Noryl® plastic (All models except OWL 100-Poly)
Polyurethane (OWL 100-Poly water-resistant model)
Operating Limits -40 to 70°C (-40 to 158°F) and 0 to 95% RH (non-condensing) except OWL 100-Poly
Clock Accuracy +/- 2 seconds per day
Battery 3.6 volt Lithium
Memory Size 32 KB (32,767 readings)
Sampling Method Continuous (First-in, First-out)*, Stop When Full (Fill-then-stop)
*Not available for sample rates faster than 8 seconds
Sampling Rate User selectable rates from 5 per second to once every 12 hours
Resolution 8-bit (1 part in 256)
Communication Optical data transfer; data can be transmitted through glass or transparent medium up to 25 mm (1in)
Alarm Type Flashes red LED once every 8 seconds
PC Requirements Windows PC with a least 256MB RAM, 250MB of hard drive space and one free serial or USB port
Software Requirements TrendReader® (compatible with Windows 7, Windows 8 & Windows 10t)
Memory Size 32 KB
Logger Accuracy +/- 1% of range

ACR ET Series Thermistor Probes
(OWL 200 works with any NTC thermistor probe)

General Purpose -35 to 95°C (-30 to 200°F)
Low Temperature -60 to 55°C (-75 to 130°F)
Low Temp Penetration -60 to 55°C (-75 to 130°F)
High Temperature 10 to 170°C (50 to 335°F)
Oven Temperature 70 to 255°C (155 to 490°F)
Skin Surface Temperature 20 to 40°C (68 to 104°F)
Pipe Surface Temperature -35 to 95°C (-30 to 200°F)
Waterproof Temperature -40 to 105°C (-40 to 221°F)