PID Controllers


Styrax manufacturers fully featured micro controller based PID105 controllers. It receives two universal inputs which can be programmed in the factory. PID controller interface with BMS through RS485 using standard MODBUS RTU. User can configure set points through RS485 and also monitor Output signal level and Input parameter values.

PID105 supports Auto and Manual mode controlling. PID105 is an auto-tuning controller; from cold start or at set point. Typical applications are temperature control, RH control, thyristorised heating applications, AHU control in HVAC and BMS applications.


  • Advanced Microcontroller based PID controller.
  • PID controlling.
  • Software Calibration for 2 channels.
  • Auto and Manual mode controlling.
  • MODBUS RTU multi drop RS-485 serial communication for PLC, SCADA, etc.
  • Fixed baud rate with 9.6k
  • Remote programmable from master device.
  • Wall mounting.
  • ABS enclosure.


Input Type:

  • 4 - 20mA
  • 0 - 10VDC.

Measuring Ranges:

  • %RH: 0.0 to 100% RH.
  • Temperature: 0°C to 50°C.


  • %RH: ±2% RH for 10 to 90% and ±3% RH for remaining.
  • Temperature: ±0.3°C for 0°C to 50°C.


  • %RH: 0.1% RH.
  • Temperature: 0.1°C.

Output Types:

  • 4-20mA
  • 0-10VDC
  • PFC

Communication Ports:

  • MODBUS RS485

Operating Voltage:

  • 24VDC/24VAC.

About Us

Styrax Instruments India Pvt. Ltd., has been one of the prominent manufacturers and suppliers of Process Measure and Control Systems.

Clean room Interlocking Systems, Automation Solutions and hi-tech security and access control systems.


STYRAX Instruments India Pvt Ltd.

H.No: 2-77, Near Gajularamaram Chowrastha, Gajularamaram, Hyderabad - 500055. Telangana - INDIA.
Ph: +91 9989222456

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