The default value for msgsize_max is 8192 bytes. The minimum value is 128 (8192 in kernels before ). The upper limit for msgsize_max has varied across kernel versions: * Before Linux , the upper limit is INT_MAX . * From Linux to , the limit is 1,048,576. * Since Linux , the limit is 16,777,216 ( HARD_MSGSIZEMAX ).
MQ-7 Semiconductor Sensor for Carbon Monoxide Sensitive material of MQ-7 gas sensor is SnO 2, which with lower conductivity in clean air. It make detection by method of cycle high and low temperature, and detect CO when low temperature (heated by ). The sensor’s conductivity is more higher along with the gas concentration rising.
The CL-38uC control amplifier and the MQ-88uC power amplifier are based on the latest technology and design, but the exterior styling evokes a classic image from the heyday of vacuum tube audio products. The CL-38uC is modeled on the CL-35, released in 1970, and the MQ-88uC is modeled on the MQ-60, released in 1969.
MQ-7 sensitive components consists of 2 parts. one is heating circuit having time control function (the high voltage and the low voltage work circularly ). The second is the signal output circuit, it can accurately respond changes of surface resistance of the sensor. V H Vc