Bolec EA101 – 3 channel gauge alarm
The Bolec EA101 is a three channel gauge alarm that provides an alarm output when the reading on any one of three gauges passes a predetermined fault level. The unit will switch on falling pressure or rising temperature for standard resistance gauges – eg: VDO, Smiths, etc.
As long as the sensing unit is a variable resistance to ground, and the signal being measured is a variable DC voltage, this unit may be used to give an alarm output from any brand of gauge-sender combination.  An alarm is given on three 25-turn potentiometers, allowing fine adjustment across the full scale for
most known gauges.

Alarm output is via a transistor switch, switching the output to earth internally upon a fault condition.  Typical application would be as an alarm control for diesel engines, giving protection and early warning for low engine oil pressure, high engine temperature & low gearbox oil pressure.  This unit may also be used without gauges if necessary ie: with sender only. Refer wiring diagram.

Schematic
1. Dimensions: Approximately 58 x 42 x 29mm overall.
2. Voltage, Current: 12-14.2 VDC Neg Gnd, 10mA quiescent
3. Adjustment Range: 0 – 10VDC at sender terminal.
4. Output Rating: 12/24VDC 0.25amp per output, resistive
5. Total Power Dissipation: 1W at 258C, 600mW at 85C

 

About the Manufacturer - Bolec Electronics

Founded in 1978, Bolec Electronics is a family-owned Australian company that has developed a portfolio of over 80 products and a reputation for making things that survive and thrive in some of Australia’s harshest work environments.   Bolec Electronics designs, manufactures and distributes electronic control modules, monitoring systems, instrumentation and auto-start systems for diesel and gasoline engines used in the agricultural, commercial vehicle, industrial and mining industries.   Bolec Electronics manufactures heavy-duty adjustable clamps used in the RV and refrigeration industries.   Bolec  Electronics is a supplier to some of the world’s largest OEMs and Tier 1 parts manufacturers.

 

 

Bolec Electronics’ line of “black boxes”

 

WL701

Low coolant alarm kit with probe, integrated buzzer and relay outputs

WL601

Low coolant alarm kit with probe and relay outputs

TM301

Versatile timer module

SS301

Single channel speed switch

SC303

Unique module for correcting sensors to gauges

FL301

Gauge alarm with relay outputs

EA101

3-channel gauge alarm

ERB205

Electronic ratio box – used to calibrate speedometer after changing tyre size – or any other application that requires an input signal frequency to be changed

DB1-128

Signal booster (converts weak signals to robust square waves) and frequency divider (useful for connecting modern high frequency sensors to older gauges)

 

 

 

Do an internet search for “Bolec Electronics” to view our website and instructional videos on Youtube