This barometric pressure instrumentation package offers optimized 800 to 1200 mbar absolute scaling and 16-bit digital signal processing to provide reliable air density data for wind turbine generator operational limits and automated alarms.
The SRP-N118 series wall-mounted process meter, when integrated with a DMP 331i precision pressure transmitter, provides a high-resolution barometric monitoring solution specifically engineered for the rigorous demands of wind turbine control systems and safety shutdown circuits. In wind power installations, accurately tracking air density is a critical variable for calculating aerodynamic lift and the resulting torque on turbine blades; because air density is a direct function of barometric pressure and temperature, even minor fluctuations can significantly impact the power curve and structural load limits of the generator. By utilizing a DMP 331i sensor scaled specifically to an 800 to 1200 millibar absolute range, the system optimizes signal output resolution across the relevant atmospheric window, ensuring that the 0 to 10V analog signal provides the granular data necessary for a 16-bit analog-to-digital converter to perform active thermal compensation and minimize offset errors.
This instrumentation package is particularly effective for process engineers who need to integrate atmospheric monitoring into existing Modbus RTU networks or standalone safety loops. The SRP-N118 series display features a six-digit LED readout that ensures high-visibility local monitoring, while its internal 24V DC power supply output simplifies installation by providing a stabilized excitation voltage directly to the pressure transducer, eliminating the need for secondary external power rails. For automated safety protocols, the unit’s dual relay outputs can be configured as independent threshold alarms—functioning as opening or closing switches that trigger if barometric conditions fall outside of safe operational parameters, such as during extreme low-pressure weather events that could lead to overspeed conditions.
The hardware is designed for longevity in industrial environments, featuring an IP65-rated ABS and glass fiber enclosure for the display and a stainless steel 1.4404 housing for the sensor to resist corrosive elements. Configuration is streamlined through the S-Config software or an optional infrared remote, allowing technicians to adjust scaling, decimal point positioning, and alarm hysteresis without breaching the environmental seal of the wall-mounted case. Whether utilized in a nacelle-mounted control cabinet or a base-level monitoring station, this combination ensures high-fidelity barometric tracking with a thermal stability of 50 ppm/°C, providing the reliable data required for the complex algorithm-driven pitch and yaw adjustments that protect modern wind energy assets.
SRP-N1186 Wall Mounted Display Unit
- Part No: SRP-N1186-1821-1-1-001
- Number of Outputs: 2
- Type of Outputs: Relay
- Power Supply: 24V DC
- Options: 6-digit display
- Display: Red LED 4 x 20mm High, -9999 to +99999 + decimal point
- Transducer Power Supply: 24 V DC +/-15% max.100 mA
- Communications interface: RS 485, 8N1 and 8N2, 1200 bit/s – 115200 bit/s, Modbus RTU
- Operating Temperature: 0 – 50°C
- Case Style: Wall Mounted
- Case Dimension: 110 x 80 x 67mm (excluding cable glands)
- IP Rating: 65
- Case Material: ABS + Glass Fibre
DMP 331i Barometric Pressure Sensor
- Pressure Range: 800 to 1200
- Units: mbar
- Range Type: Absolute (0 to +P)
- Output Signal: 0 – 10V, 3-wire
- Electrical Connection: IP67 seal with 2m of cable
- Process Connection: 1/4 NPT male
- Cable Length Units: Metres (m)