Device for monitoring operation of a solenoid valve and a method for monitoring operation of a solenoid valve

A device for monitoring operation of a solenoid valve, the device comprising:

• a circuit for supplying power to a coil of the solenoid valve, comprising terminals connected in series with a power source, the terminals configured to be connected to the coil, a power supply switching transistor and a measurement resistor;
• a microprocessor-based measurement system configured to monitor supply current consumed by the coil while the coil is switched on, by measuring voltage at the measurement resistor, and to control the power supply switching transistor;
• wherein the microprocessor-based measurement system:
• comprises an analogue-to-digital converter comprising a consumed current measurement channel connected to the measurement resistor and a consumed current amplified measurement channel connected to the consumed current measurement channel via an adjustable amplifier;
• and is configured to:
• switch off the power supply switching transistor when a voltage having a value higher than a threshold value is detected on the consumed current measurement channel;
• and
• control the gain of the adjustable amplifier so that the signal at the input of the consumed current amplified measurement channel is lower than the measurement range of this channel.