Apollo Intelligent Meter Series IMY Manual do Utilizador descarregar pdf (Página 24)

TEMPERATURE MONITORING EXAMPLE

An IMY is installed as a monitoring device and back-up

controller for a freezer storage facility. Normally, the

freezer temperature is maintained at about -29°C ±2°. The

absolute maximum allowable temperature of the freezer is

0°C. In the event of a system failure, alarm output #1 of the

IMY is programmed to start a secondary cooling system

should the temperature reach 0°C. The additional alarm of

the IMY is used to signal personnel with a warning bell

when the temperature rises above -17°C (indicating a

possible failure of the main cooling system). This alarm is

programmed to latch in order to assure that personnel

inform maintenance of a possible problem. Key switches

are installed to lock out the front panel from unauthorized

personnel and to provide a means of resetting the latched

alarm. The Integrator/totalizer option is specified to store

peak and valley temperatures overnight, weekly, etc.

Programming module #5 (Pro 5) is used to set up the

integrator. The re-transmitted analog output is specified to

drive a chart recorder with 4-20 mA for a hard copy of

temperature profiles for later evaluation.

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Apollo Intelligent Meter Series IMY Manual do Utilizador Página 24