Boiler Level Controller
A fully-automatic mechanical level controller for steam boilers, pressurised tanks and hydrophore sets — a stainless-steel float drives dual high-temperature mercury switches giving three switching states: pump control, burner enable and low-level alarm.
Technical Data
| Type | Boiler Control Level Switch — Type A1 (flanged) / A2 (threaded 1") |
|---|---|
| Sensing | Stainless-steel float, fully mechanical |
| Switching | Dual high-temperature mercury contact tubes — individually fine-tunable |
| Switching states | Three: feed-pump control · burner enable/disable · low-level alarm |
| Max. working pressure | 25 bar (362 psi) |
| Max. temperature | 200 °C |
| Body | GGG.40 spheroidal cast iron; aluminium injection bonnets |
| Electrical rating | Ui 380 V AC · Ith 6 A · silicone-insulated wiring |
| Protection | Fail-safe against dry-running and over-fill |
Datasheet & Drawings
GA, hook-up and wiring drawings are prepared per order — supplied with your quotation for approval.
EN 10204 3.1 material certificates are supplied with your shipment.
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Frequently Asked Questions
How does the Boiler Level Switch work?
A stainless-steel float follows the water level and tilts dual high-temperature mercury contact tubes, giving three distinct switching states — feed-pump control, burner enable/disable and low-level alarm.
What are the pressure and temperature limits?
Maximum working pressure is 25 bar (362 psi) and maximum allowable temperature is 200 °C.
Which connection types are available?
Type A1 with a GGG.40 flanged body, or Type A2 with a compact 1" threaded connection (BSP).
Does it protect against dry running?
Yes — the low-level state trips the burner and raises the alarm before the water reaches an unsafe level, and the same architecture prevents over-fill.
Can the switching levels be adjusted?
Yes — each mercury contact tube is individually fine-tunable, so pump, burner and alarm differentials can be set to your vessel.
What is the electrical rating?
Rated insulation voltage 380 V AC with 6 A continuous current, wired with silicone-insulated cable for heat and moisture resistance.
Engineered to order. Delivered worldwide.
Send your duty conditions — size, pressure, temperature, medium and connections — and our engineers return a drawing, material selection and lead time.
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