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ACI A/ENT-DIFF Differential 4-20 mA Enthalpy Controller


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The A/ENT-CTRL and A/ENT-DIFF are low cost Enthalpy controllers that measure both temperature and humidity and converts them into a sourced relay output. The supply voltage to the A/ENT-CTRL/DIFF is common to both the N/O or N/C contacts of the 10A Form 1C Relay. The relay is controlled or switched by selecting the proper mode switch within the unit. The A/ENT-CTRL-F1C has the same features as the A/ENT-CTRL except for the switch relay output which is a 10A Form 1C dry contact referaced to the supply voltage common. f other resistance-based humidity sensors that utilize water-soluble polymer coatings. This technology enables these sensors to fully recover from condensation and enables the sensor to maintain its accuracy over time. Despite its accuracy, the Advanced Ceramic Technology sensor and related circuitry is economical.

All of the A/ENT-CTRL and A/ENT-DIFF are calibrated using a NIST Traceable temperature and humidity controlled environmental chamber. Factory selectable calibration can be achieved for elevations of 0, 1000, 2000, 3000, 4000, 6000, 8000, and 10000 feet. Use reverse action in the A/ENT-CTRL/DIFF unit to change the NO/NC switch action.

All of the A/ENT series units come with a five year factory warranty.



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