Boiler Proportional Level Controllers
A boiler proportional level controller measures the boiler water level continuously and feeds water as needed instead of on-off. With a steady level, steam pressure and quality become more stable and the pump does not start and stop frequently.
The system consists of a capacitive electrode that measures the level, a digital proportional-integral controller and an electrically actuated proportional feed valve. The store range includes capacitive level electrodes from 300 mm to 2000 mm, including ¾” connection models.
Main Applications
- Steam boilers with variable load
- High-capacity industrial boilers
- Boiler systems with economisers
- Processes where steam quality is critical
Technical Data
| Level measurement | Capacitive level electrode |
|---|---|
| Electrode lengths | 300, 700, 1000, 1200, 1500, 2000 mm (product range) |
| Electrode connection | ¾” (product range) |
| Control | Digital, proportional-integral (PI) |
| Control valve | Electrically actuated proportional valve, cast steel body |
| Valve signal | Position control or 4–20 mA |
| Outputs | Analogue level output; high and low level alarm contacts |
| Pressure and temperature | Suited to boiler design pressure and feed water temperature (by model) |
Material Options
| Part | Function |
|---|---|
| Capacitive electrode | Measures level continuously |
| Controller | Calculates valve position to hold the set level |
| Motorised valve | Adjusts feed water flow proportionally |
| Alarm contacts | Report high and low level |
Which material? Proportional control does not replace safety switches; independent low and high level switches must also be used. Electrode length is chosen by the boiler’s measuring range.
Advantages
Steady Level
- Feed water supplied as needed
Stable Steam
- Fewer pressure swings
Pump Life
- No frequent start-stop
Analogue Signal
- Monitoring via 4–20 mA
Construction and Design Features
- Capacitive electrode mounted vertically in the boiler
- Digital proportional-integral controller
- Electrically actuated proportional feed valve
- Alarm and analogue output terminals
Write the boiler capacity, pressure and measuring range; we will define electrode length, controller and valve together.
How to Choose?
- Set the measuring rangeMeasure between the boiler’s low and high control levels.
- Choose the electrode lengthPick a 300–2000 mm length covering the range.
- Size the valveSelect the proportional valve by feed flow.
- Add safetyPlan independent level alarm switches.
Complementary Products
Why ORFA?
Other Level Control Devices
Alarm and Remote Monitoring Devices
Alarm and remote monitoring devices report the level status in tanks and wells by audible, visual or remote notification.
Details →
Glass Tube Level Gauge
Glass tube level gauges allow the liquid level inside a tank to be seen directly through a transparent glass tube.
Details →
Electric Level Float Switches
Electric level float switches float with the liquid level, change contact and operate a pump or alarm.
Details →
Hydrostatic Level Transmitters
Hydrostatic level transmitters measure level from the pressure of the liquid column and provide a continuous signal.
Details →Capacitive Level Sensors
Capacitive level sensors detect the level of liquids and solids by changes in capacitance.
Details →Solids Level Switches
Solids level switches detect the level of powder and granular materials in silos and bunkers.
Details →
Boiler Level Switches
Boiler level switches detect low and high water levels in steam boilers and control the burner, pump or alarm.
Details →
Boiler Feed Water Level Controls
Boiler feed water level controls start and stop the feed pump according to the water level in the steam boiler.
Details →
Magnetic Level Indicators
Magnetic level indicators show the tank level by transferring the movement of a magnetic float to external indicator flaps.
Details →
Magnetic Level Transmitter
Magnetic level transmitters convert the position of a magnetic float into a continuous electrical signal.
Details →
Stainless Steel Level Switch
Stainless steel level switches are float level switches with stainless steel bodies suitable for corrosive and hot liquids.
Details →
Plastic Level Switches
Plastic level switches are economical float switches used in water and mild chemical tanks.
Details →Radar Level Transmitters
Radar level transmitters measure the level of liquids and solids without contact and provide a continuous signal.
Details →
Reflex Glass Level Gauges
Reflex glass level gauges show the liquid level clearly in steam boilers and pressure vessels.
Details →
Level Indicators
Level indicators allow the liquid level in tanks and vessels to be monitored on site.
Details →
Level Control Panels and Sensors
Level control panels and sensors are control systems that automatically start and stop pumps according to the level in tanks and wells.
Details →
Liquid Level Electrodes
Liquid level electrodes detect the level of conductive liquids by electrode contact and send a signal to the level relay.
Details →
Float Level Switches
Float level switches change contact by means of a float moving with the liquid level and control a pump or alarm.
Details →Float Valves
Float valves open when the water level in a tank drops and close when it is full, keeping the level mechanically.
Details →
Tank Level Switches
Tank level switches signal at set levels in storage tanks to control filling, emptying and alarms.
Details →Get a quote for your project
Our sales team will prepare the best solution for your needs.