ABB series LM80.A application equipment industrial control DCS system medium range laser liquid level transmitter
Brand ABB Color Standard Application Industrial height 358mm rated current 150mA
Protection Level IP45 Suitable for motor power 249KW Application Site Power Industry BOM Number GJR2391500R1220 Power industry HIEE401782R0001 Part Number LM80.AC-CSA
Applicable pipe 2 Whether imported is weighing 3.18 kg can be sold nationwide
ABB series LM80.A application equipment industrial control DCS system medium range laser liquid level transmitter
Electrochemical gas detection elements require a constant bias to operate properly and accurately, which can consume a lot of power. When devices are in idle or sleep mode, a normal power management system will often try to keep them all switched off. However, electrochemical sensors can take tens of minutes or even hours to stabilize. Therefore, the detection element and its bias circuit must be in an “always on” state. In addition, for consumer electronics applications using a single AA battery, the required bias voltage is usually very low.
The MAX40108 is a low-power, high-precision operational amplifier (op amp) with an operating power supply down to 0.9V, designed specifically for instrumentation applications. In addition, the device has rail-to-rail input and output characteristics with a typical supply current consumption of only 25.5 µA and a typical zero-drift input offset voltage of 1 µV over time and temperature. Therefore, it is ideal for a variety of low-power applications, such as consumer electronics such as ethanol and CO gas sensors.
Figure 1 shows a block diagram of an electrochemical sensor such as ethanol or CO. A low-voltage operational amplifier is used in the system, which is directly powered by a 1.5V AA/AAA battery to provide bias current to the electrochemical sensor, while the rest of the system is in sleep mode to save power. The first op amp U1 powers the reference electrode of the electrochemical sensor. The second op amp, U2, is configured as a transconductance amplifier that converts the sensor’s current output into a voltage output, which is amplified and digitally processed by a microcontroller. The voltage signal is amplified by the MAX44260 (U3), a 1.8V, 15 MHz, low-offset, low-power, rail-to-rail input/output (I/O) operational amplifier. ES stands for electrochemical sensor.
ABB series LM80.A application equipment industrial control DCS system medium range laser liquid level transmitter
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