Quatrosense Environmental Ltd. (QEL)

Model M - Multi Channel Digital Analog Controllers

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The M-Controller is a multi-channel controller and alarm unit that utilizes both digital and analog communications to interface with a maximum of 32 remote digital QEL transmitter/sensors, and 8 analog transmitter/sensors.

The M-Controller is a multi-channel controller and alarm unit that utilizes both digital and analog communications to interface with a maximum of 32 remote digital QEL transmitter/sensors, and 8 analog transmitter/sensors. These are used to measure a wide variety of toxic gases such as CO, NO , NH , H2 , SO , Refrigerants, Combustibles, and 2 3 S 2 CO . The RS-485 communication is connected via a 4-wire multidrop configuration to reduce the overall installation 2 costs of the system. Range and alarm setpoints are set through the front keypad or through QEL supplied software that is downloaded to the controller from a PC or laptop computer. With three standard on-board relays the controller
can direct up to 12 remote relay modules, each of which may have up to eight relays for a total count of 99 relays, without compromising the sensor count. Common relay configurations include voting, averaging, delay on actuation and deactuation, normally/not-normally energized and latching. The audible alarm has three buzzer settings, continuous, intermittent and double-tap intermittent. An additional feature includes 24 VDC transistor outputs for a horn and strobe. An RS-422 responds as a RTU Slave using MODBUS protocol which allows the controller to provide read status information only. The RS-232 interface uses a RJ-11 telephone jack primarily used for uploading and downloading a large configuration database. Available is an analog output card that includes eight 4-20 milliamp analog outputs. Each analog output can be defined in complex fashions allowing the averaging of several input signals and the assignment of different values to both the 4 and 20 milliamp outputs. The M-Controller automatically linearizes the values between these two points. Each controller comes standard with a 2 x 16 character back-lit display with an adjustable scroll rate.

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