Refrigeration Temperature Monitor


The SZ1144 is a microprocessor-based refrigeration
monitoring and alarm interface designed to monitor
up to four 1000 Ω platinum RTD temperature sensor
inputs and up to two 4-20 mA inputs.


• Stand-alone or network operation • Independently programmable high and low limits for each input • Independently programmable manual or automatic alarm reset • Change of state factor with programmable hysteresis • 32 character LCD display • Status LEDs • Relay output to activate additional auxiliary communication devices or external alarm circuit • Four RTD temperature inputs • Two 4-20 mA analog inputs suitable for a broad variety of transducers

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Specs & Docs


General Accuracy: +/- 0.5% Programming: EIA RS485 interface Display: 32 character LCD Communications: RS485, half duplex Memory backup: Non-volatile EEPROM, no battery required Environmental Operating temperature: 32 to 131°F (0 to 55°C) Operating humidity: 0 to 100% RH, non-condensing Storage temperature: 14 to 140°F (-10 to 60°C)Electrical Supply voltage: 24 VAC +/- 20% Inputs: Four platinum RTDs, range: -40 to 60°F (-40 to +15.6°C) two 4-20 mA analog and two digital (dry contact) Outputs: One digital (SPST dry contact, 24 VAC @ 1 A) configurable Analog input impedance: 250 Ω Common mode rejection: 100 db @ 60 Hz Power Consumption: 5 VA max. Specifications subject to change without notice.