Center pivot irrigation systems are a widely used method for distributing water across large agricultural fields. As the name suggests, the system rotates around a central pivot point, applying water through a series of sprinklers mounted along the span. When properly designed and operated, center pivot systems provide relatively uniform water application while reducing labor requirements compared to flood or manual irrigation methods.
To ensure consistent performance throughout the growing season, farmers must monitor key operating parameters. Pressure and flow transmitters play a critical role in verifying that the irrigation system is operating within its intended range and responding quickly when conditions change.
Pressure Monitoring in Center Pivot Systems
Pressure transmitters are commonly used to monitor line pressure along the irrigation system. Maintaining pressure within a specified range is important for both water distribution and operating cost control. If pressure is too low, water may not travel effectively to the far end of the pivot, leading to uneven application and potential crop stress. Excessive pressure, while capable of maintaining spray performance, increases energy consumption and accelerates wear on pumps, pipes, and sprinkler components.
As noted by the CropWatch program at the University of Nebraska–Lincoln, insufficient pressure can reduce application uniformity, while excessive pressure raises energy costs without delivering proportional agronomic benefits. Continuous pressure measurement allows operators to confirm that pumps, regulators, and pressure-reducing valves are functioning as intended.
Pressure transmitters can also help identify developing issues such as leaks, clogged nozzles, or pressure fluctuations caused by elevation changes across the field. Early detection allows farmers to correct problems before they result in uneven irrigation or lost yield, particularly during critical growth stages.
Series 626 and 628 Industrial Pressure Transmitters
For center pivot irrigation systems, Series 626 and 628 Accurate Industrial Pressure Transmitters are well suited to line‑pressure monitoring in field conditions. These compact transmitters are designed for harsh environments and offer rugged construction with resistance to shock and vibration, which is important for equipment mounted on moving pivots. Their design also addresses common electrical challenges in agricultural settings, including exposure to electrostatic discharge and transient surges that can occur during nearby lightning events. By providing stable, continuous pressure feedback under these conditions, the Series 626 and 628 transmitters support reliable monitoring of pump performance and distribution pressure across the pivot, helping operators maintain target pressure ranges without excessive maintenance or downtime.
Flow Measurement for System Performance Verification
Flow transmitters are used to measure fluid velocity and volumetric flow within a center pivot irrigation system. In a pivot configuration, water moves through a radial pipeline extending down the length of the field. While all sprinklers are supplied by the same main line, they do not operate at the same flow rate. Sprinklers located near the pivot point irrigate a relatively small surface area and therefore require lower flow, while sprinklers near the end of the pivot cover significantly larger areas and operate at higher flow rates.
Monitoring system flow helps verify that this hydraulic balance is being maintained during operation. Deviations from expected flow rates may indicate partially blocked lines, malfunctioning regulators, nozzle wear, or declining pump performance. When used alongside pressure transmitters, flow measurement improves fault isolation. For example, stable pressure with reduced flow may suggest localized restrictions, while simultaneous drops in pressure and flow often point to upstream supply or pump-related issues.
When used alongside pressure transmitters, flow measurement provides additional diagnostic context. Stable pressure with reduced flow can suggest localized restrictions, whereas concurrent reductions in pressure and flow may point to upstream supply limitations. Flow data also supports water use tracking, allowing growers to correlate applied water volume with crop requirements and seasonal planning goals.
Series IEF Insertion Electromagnetic Flow Transmitter
The Series IEF Insertion Electromagnetic Flow Transmitter provides accurate, repeatable measurement of liquid flow velocity for pipes ranging from 4 to 36 inches. Using electromagnetic sensing technology, it delivers reliable performance across a wide range of water and conductive liquid applications while allowing for adjustable insertion to simplify installation.
Multiple output options are available, including analog, frequency, alarm, and 2‑wire RS‑485 communications with selectable BACnet MS/TP or Modbus® RTU protocols. This flexibility makes the Series IEF well suited for systems such as boiler feedwater, chilled and condenser water, wastewater, remediation, and industrial process flow monitoring where both measurement accuracy and integration are required.
Level Measurement at the Water Source
Level transmitters can be installed at the reservoir, pond, or pump station supplying water to the center pivot system. Monitoring source water level helps confirm adequate availability throughout the irrigation cycle and provides early indication of drawdown conditions that could affect system performance during peak demand.
Level measurement is particularly valuable in systems relying on surface water storage, where declining supply can impact pump operation or introduce air entrainment risks. When combined with pressure and flow data, level measurement adds context to system behavior and supports more informed irrigation scheduling decisions.
Series PBLT2 Submersible Level Transmitter
The Series PBLT2 Submersible Level Transmitter is designed for reliable liquid level measurement in demanding wastewater, slurry, and industrial tank applications. A rugged 316 SS housing and large, non‑clogging diaphragm seal protect the sensing element from damage caused by solids and debris, supporting long service life in harsh environments.
Integrated surge protection helps guard against power and lightning‑related transients, while a vented, shielded cable with a maintenance‑free filter automatically compensates for atmospheric pressure changes. These features make the Series PBLT2 well suited for level monitoring in sumps, digesters, sludge pits, chemical tanks, and other challenging installations.
Series PBLTX Submersible Level Transmitter
The Series PBLTX Submersible Level Transmitter is designed for accurate liquid level measurement in wastewater, slurry, and other harsh tank applications where hazardous conditions may be present. Its UL‑approved intrinsically safe design, when used with a proper barrier, allows for safe installation in classified locations.
A rugged 316 SS housing and non‑clogging diaphragm seal help protect the sensing element from solids and debris, while a vented, shielded cable with a maintenance‑free filter compensates for atmospheric pressure changes. These features make the Series PBLTX well suited for use in sumps, digesters, sludge pits, chemical storage tanks, and similar demanding environments.
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