Loopback Systems Inc. QLog™

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QLog™ is a battery-powered or solar-powered field ready IoT based data logging system that provides paperless recording for continuous water quality monitoring of CT (contact time) for free or combined chlorine, PH and temperature. This system records months of data which is archived in a CSV file that can be retrieved remotely from any PC, smart phone, or smart tablet.

The system comes with a friendly cloud interface that allows you to log in and view your remote analytical assets at any time. The dashboard provides you with a view & trending of your remote analytical measurements. You may also set key Hi or Low alarm points on your measurements that can easily notify the operator by way of text or email if a critical condition exists.

The base system comes standard with three (3) analog inputs and three (3) digital/relay inputs. The relays can be set for Hi/Lo chlorine alarms. The digital inputs can detect on/off status or frequencies up to 2kHz. The analog inputs can be set to 1-5Vdc, or 4-20mA powered by the built-in battery pack.

The QLog™ includes our 3+3 dashboard, which includes 3 years of historical trends and 3 years of Verizon Cell/Dashboard service. There is no programming necessary to retrieve the data from QLog. Simply log into your account and your data will immediately show up on your personal dashboard. From there, you can assign users that will receive alarms based on the measurement of the sensors.

QLog™ is also available with a complete sensor and sample system for your chlorine measurement applications.

Contact us today for more information.

Features & Applications


  • Verizon ready
  • No contracts
  • Three (3) analog inputs, three (3) digital inputs
  • Verizon 3 year cloud service included
  • “Grab N Go” cloud paperless recorder
  • Data location from built-in GPS cloud monitoring/alarming service
  • Optional chlorine sensor/sample system
  • Cloud monitoring/alarming service


Water Systems

  • Well House
  • Booster Station
  • Water Tank
  • Distribution System Endpoints
  • Reservoir Monitoring

Wastewater Collection Systems

  • Final Filtration
  • Plant Effluent

Technical Specifications

  • Operating Temp: -40 to +185°F (-40°C to 85°C)
  • Humidity: 0% – 100% condensing
  • Power: Four (4) 3.6Vdc D side size Lithium Thionyl Chloride batteries
  • NEMA 4X Enclosure with wall mount brackets
  • 3 Relay Inputs (6A @ up to 250V AC)
  • 3 Analog Inputs (4-20mA)
  • Data Interface: LTE CAT M1 MQTT w/ SparkPlug B
  • Cellular Radio Power: 23dBm
  • Antenna Type: LTE w/ Internal GPS
  • Attached Analog Sensor: Configurable 13Vdc or 18Vdc
  • Enclosure: Industrial polycarbonate UV Rated; IP64
  • Electrical Connection: Pluggable terminal block, 16-30AWG screw terminals
  • Local Micro-USB Configuration Port
  • Weight: 1 lbs (0.6kg)
  • Estimated Monthly Data Usage:Check-in interval dependent• 30 sec = 54 MB• 1 min = 27 MB• 5 min = 5.4 MB• 15 min = 1.08 MB• 60 min = 0.27 MB



Data Sheet

QLog Datasheet