A continuous water level sensor for boilers is a capacitive probe rated PN 40 (32 bar at 238 °C), screwed G ¾ A to ISO 228, giving 4–20 mA to control the feedwater valve or pump VFD. It keeps the water level steady and avoids low water and batch feeding – in line with European EN 12953-6 and EN 12953-9.
Continuous water level sensor specifications
| Specifications | |
| Supply | 3 VA at 24 V DC |
| 5 VA at 24, 115, 230 V AC | |
| Output | 4-20mA |
| Connection | Screwed G ¾ A, ISO 228 |
| Operating temperature | 0 … +80°C |
| Probe operating rating | PN 40, 32 bar at 238°C |
Capacitive level measurement in boilers
The probe sits in the boiler or an external level chamber; capacitance changes with water level and becomes 4–20 mA for continuous feedwater control – see boiler feedwater control. Low-water shutdown must use separate, independent level limiters.
Choosing the right level technology
Reference standards
| Standard | Scope |
|---|---|
| EN 12953-6 | Safety equipment for shell boilers |
| EN 12953-9 | Water level limiting devices |
| PED 2014/68/EU | Pressure equipment |
| ISO 228 | G ¾ A thread |
| EN 61326-1 | EMC |
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Contact ISE
EQUIPMENT INDUSTRIAL SOLUTION CO., LTD (ISE) – Ho Chi Minh City, Vietnam.
Contact us: Sales +84 909 617 185 – Technical +84 979 117 185 – Email: [email protected]
