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The connection ability and input signal type of the gas alarm control host mainly depend on the specifications and design of the specific equipment. Here is a general overview:
1. Connection ability
The number of sensors that can be connected to the gas alarm control host (number of channels) is usually one of its key specifications. Different models of controllers can support different numbers of sensors, ranging from 4 to hundreds. For example, some low-end controllers may only support 4 or 8 channels, while high-end controllers may support 32, 64 or more channels. Of course, the more support routes, the more expensive the price. In large industrial applications, a special 485 chip may be required to extend the connection capability, theoretically supporting a maximum of 128 or 256 sensors.
2. Input signal type
The types of input signals supported by gas alarm controllers typically include:
1. Analog signals: The most common type of input signal is the 4-20mA current ring signal, which is a standard industrial signal used to transmit continuous variables such as gas concentration.
2. Digital signals: such as RS485 bus signals, using Modbus RTU or other proprietary protocols, for digital communication, can transmit more information, such as equipment status, diagnostic information, etc.
3. Switching signals: Some simple controllers may support dry contact or wet contact inputs to trigger alarms or status indications.
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