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Where are data-loggers used? Who uses them?
What should be looked for in a datalogger?
What should be lookedfor from a datalogger manufacturer?
Sensors like oxygen and/or pH sensors will not calibrate. Why?
My computer cannot link with the interface. What should I do?
What is the difference between digital and analogue sensors?

Q. Where are dataloggers used? Who uses them?
A. Dataloggers are used in remote areas or anywhere that you want the convenience of battery power is needed to record measurements. They are ideal for those involved with field studies, transportation monitoring, troubleshooting, quality studies, general research, and educational science. Dataloggers are also suitable for self-learning users since they are economically priced and easy-to-use. Dataloggers can be used in a wide variety of applications. Their small size makes them ideal for mounting in out-of-the-way locations.
Q. What should be looked for in a datalogger?
A. • Ease of use
• Reliability
• Accuracy
• Value
Q. What should be looked for from a datalogger manufacturer?
A. Time-proven experience, in-house manufacturing, a large customer base, and knowledgeable, helpful sales and support people.
Q. Sensors like oxygen and/or pH sensors will not calibrate. Why?
A. • The electrolyte for an oxygen sensor probe has a shelf life of around 1 year. If it is older than this, it may need replacing. Damaged probe tips must also be replaced.
• Plastic bodied combination pH sensors and the electrolyte for the refillable pH sensors have a guaranteed shelf life of around 9 months. If it is older than this, then the probe/electrolyte may need replacing.
Q. My computer cannot link with the interface. What should I do?
A. • Check the power supply of the interface, and see is it work normally.
• Check the connection cable between the interface and the computer.
• Ensure that the software is configured to the correct port that the unit is linked to.
• Try to restart the computer after checking the above.
Q. What is the difference between digital and analogue sensors?
A. Analogue data is like the mercury in a thermometer. To the thermometer user, the height of the mercury column represents a temperature. Keep in mind, the height of the column is just a height, but we interpret or convert that height into a temperature, using the markers on the glass wall of the thermometer. Similarly, the analogue data collected by a sensor is a representation of a real world quantity (like force or pressure). This "representation" can be any value within a specified range and must be converted into units that we understand. For most of the analogue sensors, the "representation" of the data is a voltage reading. This voltage is converted by the specific software provided by the manufacture using a known conversion factor. Analogue sensors include pressure, force, temperature, light intensity, acceleration, sound, voltage, current, magnetic field, humidity, heart rate etc.

Digital data is like a stopwatch. At the simplest level, the stopwatch knows that when its switch is "on," it begins timing. When the switch is "off," it stops timing. So a stopwatch does two things: it recognises an on/off state and it counts the time between those two states. Digital data is discrete numerical information that can be plugged directly into a calculation and displayed on screen. The data does not need to be converted by a conversion factor like analogue data. An example of a digital sensor is a photogate. A photogate recognises the blocked/unblocked state of its photogate beam. It measures the time between two blocked states (blocked-unblocked-blocked) and reports the time to the computer.



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