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
• 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

Call to order:


Specs & Docs


Accuracy: +/- 0.5%
Programming: EIA RS485 interface
Display: 32 character LCD
Communications: RS485, half duplex
Memory backup: Non-volatile EEPROM, no battery required
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)

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.