BEM302 in Plain English
BEM302 is a small safety panel for engines. It watches simple “vital signs.” If something goes wrong (too hot, low oil, no coolant, broken belt), it sounds an alarm and turns the engine off safely so you avoid big repair bills and lost time.
Lights and a buzzer. No complex screens.
Diesel or petrol, 12 V standard (24 V option).
Shuts down before the engine cooks or runs dry.
See why it stopped and fix the cause.
Why Protection Matters for Irrigation & Industry
Engines tend to fail at the worst time — during a heatwave or overnight. Common issues include low oil pressure, overheating, coolant loss and alternator/belt failure. Without protection, you won’t know until it’s too late. BEM302 gives you a simple safety net.
- Less downtime: Protect irrigation windows and production schedules.
- Lower repair costs: One saved engine can pay for the unit many times over.
- Faster diagnosis: First-fault memory points you to the real problem quickly.
What BEM302 Watches (The “Vital Signs”)
BEM302 has six inputs. Use them all, or just the ones you need:
- Oil Pressure: Low oil can destroy an engine quickly.
- Engine Temperature: Overheating from blocked radiators or heavy work.
- Coolant Level (water-cooled): Catches leaks before temperature spikes.
- Alternator / Belt: Detects belt breakage or charging issues.
- Spare 1 & Spare 2: Often used for pump “loss of prime” or other switches.
How It Behaves (Everyday Use)
Turn the key: BEM302 powers the run relay so your engine can start. It waits a short moment so oil pressure can build (no nuisance alarms). If something goes wrong later — for example, temperature climbs — it sounds the alarm and stops the engine safely. The first fault is saved so you can check it later.
Quick Setup (Simple Steps)
- Mount the panel in a dry, visible spot.
- Connect power (12 V; ask for 24 V variant if needed).
- Wire the run relay to your fuel solenoid/run circuit.
- Connect sensors you want to use — oil, temperature, coolant level, alternator.
- Set the small switches inside to match your sensor type (NO/NC).
- Test each input before the season starts.
Full step-by-step is in the manual: open the instructions.
Real-World Use Cases
Vineyard Irrigation Pumps
A blocked suction strainer at 1 am makes the engine overheat. BEM302 shuts it down before damage occurs. In the morning, you check the stored fault, clear the blockage and get back to watering.
Orchards & Horticulture
A small hose split drains coolant. Instead of cooking the engine, BEM302 sees the coolant loss/over-temp and stops the set safely.
Industrial Generators
A belt breaks during a long run. The alternator signal warns BEM302, which alarms and stops the engine, preventing further damage.
Costs vs. Savings
Rebuilding an engine can cost thousands. BEM302 is a small one-off purchase that prevents that kind of bill — and prevents lost waterings or factory downtime. Even one “save” can pay for the unit many times over.
Key Specifications (Simple Summary)
- 12 VDC standard (ask for 24 V variant)
- Inputs (6): oil pressure, temperature, coolant level, alternator/belt + 2 spares
- High-current run relay (energise-to-run)
- Short startup bypass to avoid nuisance trips
- Buzzer + LEDs, first-fault memory
FAQ (Non-technical)
Do I need special tools or software? No — a basic toolkit is usually enough. There’s no laptop or programming required.
Will it work with my existing engine? Very likely. BEM302 is designed to work with common switch-type senders. The manual shows how to match the input type with small DIP switches.
Can I buy it online? Yes. You can order directly from our site.
Ready to protect your pump or generator the simple way?
Talk to Bolec Electronics about the BEM302 and compatible sensors for your setup.