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Advantages

  • Two RT28U controllers in one case
  • Universal input for 4 RTDs, 6 T/Cs, and 3 linear types
  • RS485 serial interface available

Description

RT228U combines two RT28U controllers in one 96×96 mm case. Thanks to its lower cost than the combined cost of 2 separate RT28U controllers, this model is often preferred when 2 technological parameters are controlled in one machine or installation or of separate adjacent processes. Typical applications are control of 2 temperatures, temperature and humidity, pressure and temperature, pH and temperature, and other combinations. Each of the 2 incorporated controllers is equipped with universal input and controls its relay outputs by an ON/OFF algorithm. Thanks to its programmable inputs and displays as well as relay duplex outputs (2 relays per controller, 4 relays per whole device), RT228U is a widely applicable device.

Additional information

Захранване

115 VAC, 230 VAC, 90…250 V

Релеен изход
Интерфейс

None, RS485

Протокол

ASCII, ASCII PolyMonitor

Повишена лицева защита

IP65

Аналогов вход

0…10 V DC linear voltage, 0…20mA DC linear current, 4…20mA DC linear current, Custom linear signal, None, RTD Pt100 – 1.385, RTD Pt1000 – 1.385, RTD PTC 1k, RTD PTC 2k, Thermocouple (TC) B, Thermocouple (TC) J, Thermocouple (TC) K, Thermocouple (TC) R, Thermocouple (TC) S, Thermocouple (TC) T, Two-wire external transmitter

Закон за управление

ON/OFF

Монтаж
Корпус

96x96x107 mm

RT228U controller

Current / Voltage / ResistanceHumidityTemperature

Technical Specifications
Input (for each controller, programmable)
Pt100 (w=1.385); 3-wire-100…850 °C
Pt1000 (w=1.385); 3-wire-100…600 °C
PTC (1k at 25 °C); 3-wire-50…150 °C
PTC (2k at 25 °C); 3-wire-50…150 °C
Thermocouple “T”-40…400 °C
Thermocouple “J”-20…999 °C
Thermocouple “K”-20…999 °C
Thermocouple “S”0…999 °C
Thermocouple “R”0…999 °C
Thermocouple “B”100…999 °C
Linear voltage 0…10 V-199…999, programmable
Linear current 0(4)…20 mA-199…999, programmable
Custom linear (option) (1)-199…999, programmable
Two-wire external transmitter4…20 mA (2)
Manual input offsetprogrammable
Input type selectionprogrammable
Decimal point selectionprogrammable
Temperature measurement unit°C or °F, programmable
Outputs (for each controller, up to 2 relay outputs)
Relay electromechanical5A/250V w/ NO/NC contact
Solid state relay (SSR) (3)1A/250VAC
MOS gate (3)0.1A/60V, optically isolated
Output for external SSR5…24 V, 30 mA
Control algorithmON/OFF
Set pointwithin input range limits
Alarmsprogrammable
Serial interfaceRS485, isolated
Accuracy (for each controller)
Measurement error0.3% from span
Temperature drift0.02% from span for 1 °C
Cold junction compensationautomatic, -10…80 °C
RTD line compensationautomatic, up to 2 х 25 Ω
Power supply (for each controller)
Mains supply voltage230 VAC or 115 VAC
SMPS voltage90…250 V
Isolated low voltage12…24 V or 24 VAC
Non-isolated low voltage12…24 V
Consumptionmax. 1.5 VA
Indication and controls (for each controller)
Digital display3 LED indicators, 14 mm
LEDs2 LEDs for output state
Keyboard3 membrane keys
Operating conditions
Ambient temperature-10…65 °C
Ambient humidity0…85 %RH

 

Design and materials
Case materialplastic
Mountingin 90×90 mm panel cut-out
Wiringplug-in terminals
Dimensions96×96(front)x107 mm
Mounting depth98 mm
Weightmax. 600 g
Protection, front/terminalsIP54 / IP20
Increased front IP (option)IP65

(1) Instead of linear current
(2) Provides loop supply voltage – 24 VDC (only w/ isolated power supply)
(3) Ask for availability!