MTL4016 is a dual-channel switch/proximity detector interface unit. The detailed information is as follows:
- Number of Channels: Dual channels (supports simultaneous connection and independent processing of two sets of switch or proximity detector signals).
- Sensor Voltage: Supplies 7.0-9.0V DC voltage via a 1kΩ resistor, which is used to power switches or proximity detectors installed in hazardous areas.
- Input Thresholds (Compliant with NAMUR Standard): The output closes when the input current exceeds 2.1mA (corresponding to an input circuit resistance of less than 2kΩ); the output opens when the input current is below 1.2mA (corresponding to an input circuit resistance of more than 10kΩ); the nominal hysteresis is 200µA (equivalent to 650Ω) — this hysteresis design prevents frequent output switching caused by minor fluctuations in input current, ensuring stable signal transmission.
- Line Fault Detection (LFD): If the line current is less than 100µA (indicating a line open circuit), the output will open; if the line current exceeds 6.5mA (indicating a line short circuit), the output will also open. This function enables timely detection of line faults to avoid misjudgments by the control system.
- Phase Inversion: Each channel is equipped with an independent phase inversion switch, allowing separate setting of "normal phase" or "inverted phase" for the input-output logic of each channel to adapt to different on-site signal requirements.
- Switch Installation Location: Applicable to hazardous areas classified as Zone 0, Gas Group IIC, Temperature Class T6; and Division 1, Group A (per North American standards).
- Proximity Detector Installation Location: Applicable to certified hazardous areas classified as Zone 0, Gas Group IIC, Temperature Class T4-T6; and Division 1, Group A (per North American standards).
- Type: Double-pole double-throw (DPDT) on/off relay — each channel is equipped with one DPDT relay, supporting control of two independent output circuits at the same time.
- State: Normally open when de-energized — the relay contacts remain open when the unit is not powered on or the input signal is invalid.
- Response Time: ≤ 2ms, ensuring fast output switching to keep up with rapid changes in on-site signals.
- Rating: 10W, 0.5A, 35V DC — this specifies the maximum load capacity of the relay; overloading may lead to relay damage.
- Expected Life: 10⁶ operations (1 million operations) under maximum load.
Note: Suppression measures are required for inductive loads (e.g., installing a freewheeling diode). This prevents voltage spikes generated when the load is de-energized from damaging the relay contacts.
- Amber LED: One amber LED is assigned to each channel, and it lights up when the corresponding channel’s output is closed — this provides a visual indication of the working status of each channel.
- Green LED: Serves as the power indicator, lighting up when the unit is normally powered on.
- When the supply voltage is 24V DC, the current is 50mA and the power consumption is 1.2W.
- When the supply voltage is 20V DC, the current is 60mA.
- When the supply voltage is 35V DC, the current is 45mA and the power consumption is 1.6W.
As a member of the MTL 4000 series of isolated safety barriers, MTL4016 adopts integrated circuit and surface mount technology, featuring high precision, low power consumption, and high installation density. The wiring on the hazardous area side is isolated from the base plate, and the base plate does not require intrinsic safety certification.
