Table of Contents
Advertisement
Nautilus Data Loggers
2
Main Components
The main components of the Nautilus data loggers include:
· a memory chip that has the capacity to store up to 244,800 readings (see
Specifications)
· a microprocessor and an 8-bit analog-to-digital converter (A/D) that converts all
temperature signals to digital values
· a quartz clock crystal that accurately keeps track of time and regulates the taking of
readings
· an accurate on-board thermistor that the logger uses to measure ambient temperature
via changes in resistance
· a lithium battery that provides power to the logger and internal sensors
1.1.3
Programmed Operation
Nautilus data loggers run according to settings that you program. These pre-selected settings
are stored in the logger's memory and instruct it to:
· take readings at regularly spaced intervals
· associate the channel with an equation in TrendReader software
· start readings with or without a delay
· take readings continuously, or stop when memory is full
1.1.4
How Nautilus Loggers Take Readings
Each Nautilus data logger has an on-board temperature sensor that you can use to record
ambient temperature. You can turn this monitoring capability on or off using software.
Nautilus data loggers can store readings to memory using one of two sampling methods:
1. First-in, First-out (FIFO). In this method the logger continues to take readings when its
memory is full (to make room, it discards the oldest reading every time it adds a new
one). Thus, the memory will contain a "sliding window" of information.
2. Stop when Full. The logger stops recording when its memory is full.
You can set the time interval at which your logger saves readings using TrendReader
software. At a sample rate of eight seconds, one reading is taken every eight seconds and
saved to memory. Nautilus data loggers can store readings using one of two sampling modes:
1. Average. As you slow the sample rate the logger begins to average readings before
saving them to memory. To do this the logger takes a reading every eight seconds, but
instead of transferring this directly to the logger's memory, it stores the readings in an
accumulator (a temporary memory) where it is retained until the sampling interval is
over. Then the accumulator is averaged and the result is stored to memory.
2. Spot. The logger records the value of the reading at the selected sample interval and
stores it to memory. No averaging is done.
When you backup a logger's data to your computer, the correct time and date are referenced
Copyright © 2010 ACR Systems Inc. All Rights Reserved.
Advertisement
Table of Contents
