Temperature Logger Specifications: Part 2

Starting options

Temperature loggers often offer a range of techniques to start the logging.

Most loggers provide an immediate start capability via the software. A manual start option (normally a push button) is useful for where the loggers are stored for some time before use and a PC is not available. For example a farm or warehouse may need to put a logger in a shipment on demand. A start delay is useful for programming loggers prior to usage. They can then be sent to the user or picked up later.

A trigger is another handy feature. For example, when the temperature reaches 6° then start logging. This means that memory is not being used while it is within the correct temperature range but will start as soon as extreme conditions occur.

Remote starting devices are also available for many loggers. These devices allow a person to start the logger without a computer.

Number of inputs

There are a number of single point loggers on the market. These devices record either their surrounding temperature or have a remote probe. They are very useful for monitoring individual trucks or items.

Larger units provide for multiple probes. The benefit is that there is only one unit that has to be connected to a PC. Retrieving the data is quicker and simpler. The installation is more expensive and difficult because cables have to be run from the probe back to the logger but once installed it saves time.

Outputs

Some loggers provide a display so that the current, minimum and maximum temperatures can be displayed. Indicators for alarms are also available on some units. A relay output is also available. This allows an external alarm to be activated if the temperature becomes too high or low. These options will typically increase the price of the logger. There are also dedicated devices that can also achieve these functions.

Probes

Selecting the right probe is as important as selecting as selecting the right device. Many of the principles discussed apply directly the probe. Of particular importance are:

• Temperature range and accuracy
• Speed of response
• Robustness
• Shape
• Ease of use

There is now a wide range of probes available. Custom probes can also be manufactured by a number of companies.

Price

The biggest issue for many people is price. Reusable temperature loggers range in price from about $60 to thousands of dollars. Money can be saved by not over specifying what is required and by shopping around. Recent technology has allowed improved devices to be made for less so paying more does not necessarily mean better.

Summary

For advice on the best logger for you, please contact OnSolution on 02 9614 6417. We will gladly discuss your application and provide advice and recommendations.