primos 250 SR

Digital Solar Controller primos 250 SR

Flexible solar circuits controller for the control of solar heating systems Temperature difference controller for solar systems and integrated multi-function controller for flexible system extension.
Article Description
1334PRIMOS250-SR-1A-G primos 250 SR with ProbusX

General Details
  • Comfortable and intuitive user interface with 4 menus for monitoring and controlling and 4 operating buttons
  • LED-backlit LCD display
  • Micro SD-card interface
  • Data logging (data storage)
  • System specific parameter setup (storage and loading of parameter sets)
  • Firmware update
  • Prozeda bus
  • Internet connection, remote visualization and remote maintenance (conexio 200 web module)
  • Real time clock
  • 1 pre-defined solar diagram (can be switched off)
  • Energy yield measurement (flow indicator)
  • Multi function controllers with pre-programmed controller functions
  • Intelligent pump speed control
  • Target temperature charging (heat source min. temperature)


  • Tube collector function, time or solar radiation controlled, with adjustable time slot
  • Drain-Back function, time and radiation controlled
  • Holiday mode
  • Protection functions, such as system protection, antifreeze protection, collector protection and flow monitoring
  • Service and status messages with flashing symbols and acoustic warning signals
  • Parameters remain consistant even after a power outage
  • 1 output 230V AC
    1 PWM or 0-10V analog outputs for HE pumps
    1 potential free output
    4 temperature inputs PT1000


Technical Data

Technical Data primos 250 SR

Operating voltage:AC 230 Volt, 50 Hz, –10 to +15 %Inputs:Temperature inputs for temperature sensors PT 1000 (protected by varistors), Measuring range (temperature): –30 °C to +250°C
Standby consumption:0,8 WProtection:Microfuse 5 x 20 mm, 2 A/T (2 Ampere/slow)
Outputs:Electronic semiconductor relay, 230 V AC, 50 Hz,
min. 10 mA, max. 150 W, with cos φ >=0,9
Ambient temperature:0 to +40 °C
Output R0:Relay, potential-free normally open contact,
max. 250 V AC / 1 A
Sotrage temperature:–10 to +60 °C
Control output for HE pumps:PWM signal: 1kHz, ViL < 0,5 V DC, ViH > 9 V DC, 10 mA max.
Analog signal: 0 …+10 V DC +/– 3%, 10 mA max.
Housing material:100 % recyclable ABS housing
Total output of all outputs:max. 300 WDimensions:L x W x D in mm 176 × 162 × 44
Interfaces:RS 485 for ProBus / ProBusXProtection class:IP30 according to DIN 40050, EN 60529