The GCS temperature measuring system is based on the tested and proven standards that have been used successfully for over 20 years in Cold and CA fruit and vegetable rooms throughout the world. The GCS system uses a precision thermistor network to provide an accurate, high stability and linear output. The sensor is embedded into a rugged aluminium housing which has 3 layers of moisture sealing and encapsulation.
The sensors are connected through an accurate and proprietary interface to an industrial PLC control system. This provides interconnection with industry standard SCADA display and recording systems or can be used with an interface provided to a Access™-databased recording and analysis system.
The fundamental resistance is high which dramatically reduces installed errors due to wiring resistance, allowing simple multicore cables to be used.
Temperature readings become stable after 60 seconds, easily meeting the 3:00 requirement 2.3.2b in the Mexico work plan.
It can be seen that, while being well within the ±1°F requirement of the specification 2.3.2a, only two of the 32 tested probes were outside of the GCS standards (±0.2°F) and were thus rejected.