MTL2000 series isolation barrier

2. MTL2211: Dual channel high reliability independent control

Unlike the cascade logic of 2210B, MTL2211 provides two completely independent and floating input channels. Each channel can independently control a set of 500VA loads. In order to pursue ultimate reliability, its internal double pole double throw contacts are physically connected in parallel, effectively reducing the risk of poor contact. Each channel provides 2.5V DC voltage (internal resistance 680 Ω) to the on-site switch. When the circuit resistance is less than 200 Ω, it is pulled in, and when it is greater than 500 Ω, it is released. The 100 Ω hysteresis design effectively prevents misoperation caused by contact shaking.

3. MTL2213: Three channel hybrid sensor fusion terminal

In scenarios that require high-density wiring, MTL2213 provides three channels with an extremely compact volume. Its most prominent feature is the support for mixed access of switches and NAMUR standard proximity sensors. Sensors that comply with DIN 19234 standards will experience a surge in current from less than 1.2mA to greater than 2.1mA when detecting metal targets. MTL2213 accurately captures this current change to drive the relay. In addition, it also provides a unique "reverse phase" function, which can invert the alarm logic of all three channels (from "power off alarm" to "power on alarm") through simple terminal short circuiting, greatly improving the flexibility of on-site debugging.

4. MTL2215: Reverse Control of Intrinsic Safety Output

In traditional isolation barrier applications, signals always flow from hazardous areas to safe areas. MTL2215 breaks this convention by allowing the intrinsic safety circuit of hazardous areas to be controlled through switches or logic levels from safe areas. Its output contacts are strictly certified as' non energy storage devices', which means it can be directly connected to any certified IS circuit without additional evaluation. This feature makes it the perfect tool for testing on-site IS fire alarms, changing the tone of IS sound and light alarms, or injecting test signals into IS alarms without isolated inputs.

Analog Signal Processing and Energy Transmission Center

In process control, 4-20mA analog signals are the "blood circulation system" of industrial sites. The MTL2000 series has also demonstrated a strong foundation in analog processing.

1. MTL2441B: 4-20mA repeater power supply

The transmitter requires a stable energy supply to operate in hazardous areas. MTL2441B can provide a fully floating DC power supply for 2-wire or 3-wire transmitters. For a 2-wire transmitter, it can provide a terminal voltage of 17.5V at 20mA, and its internal input resistance is extremely low (less than 32 Ω), which means it hardly consumes signal energy. At the same time, it isolates and relays the current signal of the transmitter 1:1 to a safe area. The load capacity of its safe area is as high as 1k Ω, and the output impedance is greater than 1M Ω, effectively blocking ground loop interference between different control circuits.

In terms of accuracy, its transmission error at 20 ℃ is better than 20 µ A, temperature drift is controlled within 1 µ A/℃, and a response time of 200ms can fully meet the requirements of the vast majority of slow process control. It is worth noting that this model only supports AC power supply (240V or 120V), and DC power supply scenarios need to be switched to other models.

2. MTL2442B: 4-20mA isolated driver

If 2441B is the "receive" signal, then MTL2442B is the "send" signal. It receives 4-20mA instructions from the safety zone controller and drives high load equipment in hazardous areas, such as electrical positioners, I/P converters, or electrical valve positioners, after isolation. Its input impedance is less than 200 Ω, and it can provide up to 800 Ω load driving capability to hazardous areas（ 16V@20mA ）. It also has extremely low temperature drift and extremely high output impedance, ensuring the purity and integrity of control instructions.

3. Signal transmission through dangerous areas

The combination of MTL2441B and MTL2442B provides a highly creative solution when it is necessary to connect signals from two safe zones and cross a dangerous zone between them. 2441B receives and demodulates the signal on one side of the danger zone, while 2442B receives and re modulates the signal on the other side of the danger zone, achieving complete electrical isolation and physical crossing throughout the entire process.

Ultimate mechanical craftsmanship and global compliance

In addition to excellent electrical performance, the MTL2000 series also fully considers the harsh environment of industrial sites in its physical structure design. All units are encapsulated in sturdy injection molded plastic shells, with anti vibration terminals inside that can withstand severe mechanical impacts. The terminal block supports two rows of 18 digit alphanumeric markings, greatly facilitating complex on-site identification work.

In terms of installation, the equipment can be directly inserted into the standard 35mm symmetrical guide rail (top cap rail), or fixed on a flat surface with SMC2 installation fixtures. Its accessories and housing system are fully compatible with the higher end MTL3000 series, providing great convenience for users' spare parts management and system upgrades. For extreme environments, the equipment can operate stably within the range of -20 ℃ to+55 ℃ (some models are+50 ℃) when closely arranged. If a heat dissipation gap of more than 5mm is maintained, the upper limit of operating temperature can be increased to+60 ℃, and the storage temperature has reached a wide temperature range standard of -40 ℃ to+80 ℃.