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Which temperature probe do I need?
There are a variety of probes designed for different applications examples are as follows:

Penetration Probe - sensor is protected by a stainless steel sheath to protect it and the substance being measured.
Air Probe - Sensor is exposed to give accurate readings in air.
Between Pack Probe - Sensor sheath is flattened to give best thermal contact.

Why do I need to have my thermometer calibrated?
The calibration procedure checks your thermometer against reference equipment of a greater accuracy to confirm that your thermometer is giving accurate readings.

How often should I have my thermometer calibrated?
The calibration interval is determined by the Quality system you are working to and can be one year, six months etc.  The most common calibration interval is one year.

What do I do to have my Thermometer re-calibrated?
You need to send the thermometer to Rototherm as follows:
Carefully pack thermometer and probe.  Include your full contact details and send to Rototherm by registered post. Calibrated units are returned on a COD basis. Please contact us for pricing if required.

What is a Temperature Data Logger ?
A temperature data logger is an instrument used to record the temperature from sensors at predefined intervals and to display or print the results when prompted to do so.  

A single channel logger will record from only one sensor, while a multi-channel logger can record the temperatures of two or more.   Rototherm’s range of Data Loggers has the capability to log from 1 to over 100 sensors.

Alarms
Of course, sometimes simply logging the temperature is not sufficient, the user needs to know if the temperature being measured goes over or under preset levels at any time.  Consider the cost to a Supermarket should one of their freezers break down one evening and nobody knew anything about it until the following morning!

To fulfil this need the logger is programmed to trigger an alarm and also needs to communicate this to an alarm system in some way.  

Installation
The installation of the logging system should be given as much consideration as loggers themselves.  It should be easy to install and to access afterwards for easy downloading of the data.   Ideally it should not require 'miles' of unsightly and problematic wiring to be installed around the area to be monitored.

The Ideal Logger
So, having digested the above we can define our ideal logger:
No need to visit it to access the readings.
Start with a few sensors and grow as required.
Provide over and under temperature alarms.
Be easy to install.
Be free of troublesome wiring.

Does the Wire Free (Radio Linked)  Temperature Monitoring  system equipment need a radio licence?
No, all RL equipment operates on either the 418 or 434MHz licence free bands. The radio transmitters have Type Approval for most countries and the system carries a CE mark.