Large-Capacity Refrigeration Monitor
SZ2144Description
The SZ2144 is a microprocessor-based refrigeration monitoring and alarm interface based on the SZ1144, but with larger capacity. It can monitor up to six 1000Ω platinum RTD temperature sensor inputs and up to five analog inputs.
Inputs:
• Six platinum RTDs:
- Three at –40 to 160°F or –20°F if using thermistor
- Three at 20 to 220°F
• Two 4 – 20mA analog
• Three 0 – 5V analog
• Eight digital (dry contact)
Outputs:
One digital (SPST dry contact, 24 VAC @1A), configurable
Features
- 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
- Status LEDs
- Relay output to activate additional auxiliary communication devices or external alarm circuit
- Six RTD temperature inputs
- Five analog inputs suitable for a broad variety of transducers
- Options for thermistor temperature and 0 to 5V pressure inputs
- Monitor liquid line, suction and discharge temperatures
- Monitor suction line pressure
Specs & Docs
Specifications:
General
Accuracy: +/- 0.5%
Programming: EIA RS485 interface
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: Six platinum RTDs, range: (3) @ -40 to 160°F or -20 to 120°F (if using thermistor) and (3) @ 20 to 220°F two 4-20 mA plus three 0-5V analog and eight digital (dry contact)
Outputs: One digital (SPST dry contact, 24 VAC @ 1 A) configurable
Analog input impedance: 250 Ω (AI1-2); 10k Ω (AI3-5)
Power Consumption: 15 VA max.
Specifications subject to change without notice
