Often it’s useful to be able to record information over time. Sometimes this is for regulatory reasons (e.g. food safety) sometimes fault-finding and sometimes just to review what’s happened.
This is the function of a logger. In the instrumentation market, loggers capture measured parameters, processes the data and outputs either to its own software or to a spreadsheet such as Microsoft Excel.
Most commonly it’s temperature, but many other parameters such as pressure, process values (e.g. 4-20mA signals) or even brain or heart waves (the EEG or ECG) can be recorded.
Loggers might be handheld/portable, installed, within another instrument or integral in a PC.
Below are some examples of loggers:
As mentioned above, temperature is the most commonly measured parameter, but it’s far from the only one measured.
Industrial transducers are very common and these might measure flow, pressure, level and other parameters, and if one purchases a process input logger, any of these parameters may be measured.
Tip: USB is the most common method for connecting a logger to a PC, but our experience is that the Windows approach to USB can be variable. If one runs into trouble, check that the COM Port (device manager) matches the COM Port selected by the logger. If your PC has a RS232 port, this is sometimes the best and easiest method for connecting your logger.
Dallas semiconductor came up with the concept of the “1-wire” button in the late eighties.
Something of a revolution they were used for loggers, for keyless access and a myriad
Eventually they became ‘generic’ and were manufactured in all parts of the world. As one
might expect, not all manufactures work to the same levels of quality and we have come
across some button loggers that are waterproof and some that are not.
The original "1-wire" temperature logger
IANZ is the accrediting body in NZ for Metrology calibration labs. (read more about IANZ)
How accurate is your logger?
If calibrated, how competent was the laboratory that calibrated it?
In one or two cases, the manufacturer of the logger may also be a calibration laboratory and may be able to apply corrections during manufacture. This presents a major advantage in terms of accuracy and also cost; if regulations require one to have a logger certified, one done during manufacture will have a much lower total cost (logger plus certification).
For Accreditation, consideration is given to:
There are a multitude of options out there. If you need help deciding what is best for your process consult with the Homershams team on 03 358 8309.