Single Channel Process Signal (DC Voltage) Data Logger

  • Single Channel
  • Connect virtually any device that has an analog output between 0-40V
  • Record a variety of parameters (i.e. flow, level, pressure, etc.)
  • 10-year battery life
  • Flashing Visual Alarm
  • Memory Capacity of 32,767 readings
  • Optical data transfer
  • Fast sample capability

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ACR OWL 400 Shown

Product Information

Datasheet 76 KB
Memory Size

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The OWL 400 data logger is a rugged and versatile data logger that records DC voltage with ease and convenience. This logger is ideal for monitoring (through commercially available transducers) a wide variety of measurement parameters. All voltage signals can be converted into custom engineering units using the simple equation editor in ACR's TrendReader 2 software.
OWL400 Specifications
Specifications Descriptions
No. of Channels

One external DC voltage channel

Memory Size 32 KB (32,767 readings)
Sampling Methods 1. Continuous (First-in, First-out)
2. Stop when full (Fill then stop)
Rates User selectable rates from 5 per second to once every 12 hours
Input Range: 0 to 38.4 Volts DC (software selectable ranges available)
Input Impedance: Greater than 100K Ohm
Clock Accuracy:

+/- 2 seconds per day


+/- 1% of full scale

Resolution 8-bit (1 part in 256)
Power Source Battery 3.6 volt Lithium
Battery Life 10 Years under normal use
General Specifications Size 60 mm x 48 mm x 19 mm (2.4" x 1.9" x 0.7")
Case Material Noryl plastic
Mounting Magnetic backing and locking eyelet
Certification Certified to CE standard EN50082-1: 1992 (European Generic Immunity) covering ESD, RFI, and EFT/B
Meets CE Standards EN55011 Class B: 1991 (European Radiated Emissions) and CISPR Class B: 1991 (International Radiated Emissions)
PC Requirements
Processor/Operating System IBM PC or 100% compatible running WIndows 3.1, '95, '98, 2000, ME, NET, XP
Available Hard drive space At Least 2MB
Memory At Least 2MB
Communication Ports 1 Free Serial Port
Basic Software: TrendReader 2 System Requirements (Required for Standard use)
Processor Pentium II-350MHz or Faster
Operating System Windows 2000 SP4, XP SP2
Available Hard drive space At Least 250 MB of Hard disk space
Memory 128 mb of Ram (256 MB Recommended)
Communication Ports USB or Serial Port, dependant on interface cable
Internet Browser Internet Explorer 6 or higher
Screen resolution 1024 x 768 or higher
Additional Equipment Mouse or other pointing device
More info More info on the TrendReader Standard 2>>
Ordering Information
ACR TrendReader 2 Software and A Thermistor Type Probe are required for usage
Model Description Buy Online Price
MFR ID: 01-0253
ACR Systems OWL-400-PLASTIC Owl 400 - DC Voltage Single channel, 8 bit, 32 KB data logger (One 0-38.4V DC channel). (Catalog# 01-0253)  Buy Now $360.00
MFR ID: 01-0228 
ACR Systems TRS2-FULL INSTALL TrendReader 2 Full Install CD. (Latest version) Buy Now $109.00
TRS2UPGRADE  ACR Systems TRS2-UPGRADE TrendReader 2 Upgrade CD. (Requires a previous version of TrendReader Standard.) Discontinued
MFR ID: 01-0227 
ACR Systems TRS2-W/LIC-101 TrendReader 2 Interface Pkg LIC-101 Software CD, Interface cable, 9-25 pin serial adaptor Discontinued
MFR ID: 01-0230 
ACR Systems TRS2-W/LIC-102 TrendReader 2 Interface Pkg LIC-102, Software on CD, USB for OWL data loggers. (cat. 01-0230)  Buy Now $189.00
Probes (Required/ For Owl Loggers Only)
VT1P Frequency: 60Hz, Range: 0 - 150V Buy Now $345.00
ACR Systems VT-1P Single Phase Voltage Transducer One output, 0-5 Volt transducer for logging single phase, 120 Volt, 60 Hz electrical systems. For loggers with a 0-5 Volt channel.
Included Accessories
  • 1 - Users guide
Optional Accessories
Model Description Buy Online Price
18-0010 ACR Systems 9-25-ADP Converts 25 pin serial port to a 9 pin port. For use with ACR interface cables Discontinued
MFR ID: 01-0023
ACR Systems LIC-101 Lite-Link Logger-PC 9-pin PC serial port to logger interface cable Buy Now $99.00
MFR ID: 01-0232 
ACR Systems LIC-102 Interface Cable, LiteLink, USB Computer to Optical Data Logger . Compatible with Owl and PowerWatch loggers. (cat. 01-0232) Buy Now $99.00
SC100 ACR Systems SC-100 General Purpose Briefcase style, locking, customizable logger & accessory storage case Buy Now $119.00
USB100ACR ACR Systems USB-100 USB-Serial Port Cable Converts a USB port to a 9 pin serial port Discontinued
MFR ID: 01-0057
Size: 127 x 127 x 76mm . Buy Now $110.00
ACR Systems WB-100 NEMA 4X clear-faced weatherproof box for all ACR loggers
WBC100 ACR Systems WBC-100 Weatherproof Box Self-Sealing Connectors Additional self-sealing connectors for the Weatherproof Logger Box. (Catalog# 21-0003) Discontinued