Data Logging with the Varcorder

SensorNote 701: Operation notes for safety and productivity

How many Log intervals are available in the Varcorder?

There are 32,000 log intervals in the Varcorder.

What is the Sample Interval and Log Interval?

The Sample Interval is how often the Varcorder reads the current and power factor on the conductor.  The Varcorder will hold the sample readings until it reaches the Log Interval, at which time the Varcorder will take and average the sample measurements.  This average becomes the logged data point.

How long will the Varcorder Log Data?

The length of the Log Interval determines the length of time an Varcorder will take to use all of the available logged data points. See the adjacent chart for the number of days it will take to fill an Varcorder with data, based on various Log Intervals. In some cases the Varcorder is limited by battery life more than the recording capacity.

Varcorder log interval

How long will the Varcorder battery last?

The expected battery life of an Varcorder is determined by the Sample Interval and the ambient temperature.  Fresh, non-rechargeable, batteries are required so the reliability and life of the battery can be easily predicted.  Predicting the life of rechargeable batteries is uncertain, especially after several recharges.  The standard 9-volt Alkaline and Lithium batteries were chosen because they are inexpensive and are readily available throughout the world.  The Lithium batteries recommended are commonly referred to as long-life smoke detector batteries and  sell by the brand names UltraLife and Energizer.  The following Table indicates the expected battery life at 68° F or 20° C.

Varcorder sample interval

Is there a difference in brands of Alkaline Batteries?

Our review of the published specifications for alkaline batteries shows them to be about the same. The main issue for Alkaline batteries is the date of manufacture. The batteries will discharge when just sitting on the shelf. SensorLink recommends Alkaline batteries start with a voltage of at least 9.2 volts to insure proper run times. 

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