Two pressurised tanks are used to supply liquid nitrogen to a group of cryogenic freezers. The tanks operate in 'mutual exclusion', i.e. in alternating mode. Each tank is equipped with a level transducer operating in 4/20 mA. When the system is switched on for the first time, the first tank is activated by opening solenoid valve #1. When its level falls below 10% (programmable threshold), solenoid valve #1 closes and the second tank comes into operation by opening solenoid valve #2. From this point on, the level of the second tank will be monitored and when it drops below 10% (programmable threshold), solenoid valve #2 will close and solenoid valve #1 will open again. This cycle will be repeated indefinitely. Whenever a tank falls below 10% (programmable threshold), a warning signal is generated via a relay inside the S330.smartFill device to alert the gas supplier that it is time to replace the empty tank with a full one. At any time, the user can press the appropriate button on the touchscreen display to switch from tank #1 to tank #2 and vice versa.
In combination with the S330.smartFill V02 device, the S140-LTE telephone dialer, using the GSM network, allows alarm conditions to be notified via voice calls, SMS and email. In the event of a lack of liquid inside one of the two tanks, those responsible for the system will be promptly notified of the anomaly.
A team of experienced engineers is available to assist you in order to provide useful information and advice on the safest and most reliable monitoring solutions according to your specific needs.
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