State101A Data Logger

Low Cost, State-of-the-Art, State Data Logger with 10 Year Battery Life and High Memory Capacity

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The State101A data logger monitors and records the occurrence, duration and status of predetermined events by measuring changes in voltage. Typically connected to a relay or switch, this data logger features a removable screw terminal block to easily disconnect and retrieve the logger for data download without disrupting wiring connectivity.

The State101A is a great solution for a variety of industries and applications including HVAC studies to monitor heating and cooling systems for efficiency or the monitoring of gas, water or electric pumps. This device replaces costly strip chart recorders and is also used in TTL high/low monitoring, general status recording and security systems as well.

With a user programmable reading rate of up to 4Hz, 10 year battery life and the ability to store over 400,000 readings, the State101A is extremely versatile and can be active in the field for long durations of time. Other features include optional password protection and pushbutton start/stop directly on the device.

The MadgeTech Data Logger Software provides the user with many customizable options for device configuration and makes data analysis easy with graph displays, tabular data and endless reporting tools.

For additional details outlining the use of Event, Pulse or State data loggers, please refer to this application note.



State Input Range 0 to 30 V
State Input Low <0.4 V
State Input High >2.8 V
State Internal Weak Pull-up <60 μA
State Resolution 4 Hz (reading rate selectable in software)


Memory 406,323 readings; software configurable memory wrap
Reading Rate 4 Hz to 1 every 24 hours
Baud Rate 115,200
Channels 1
LED Indicators Red and Green
Battery Life 10 years typical, dependent upon frequency and duty cycle
Material ABS Plastic
Dimensions 1.4 in x 2.2 in x 0.6 in (36 mm x 56 mm x 16 mm)
Operating Environment -40 °C to +80 °C (-40 °F to +176 °F), 0 %RH to 95 %RH non-condensing
Required Interface Package IFC200
Approvals CE

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