MTL MTL4840 MTL4850 Series HART Connection Unit HCU16

MTL MTL4840 MTL4850 Series HART Connection Unit HCU16 

MTL MTL4840 MTL4850 Series HART Connection Unit HCU16 

A 16ch analogue input or output interface with options to add series or parallel conditioning to provide the correct impedance characteristics to enable the HART signals to function. Three screw terminals per channel are provided to allow through connection for the Tx+, input and return signals. Connection to the BPHM64 is made via a 20 way ribbon cable. Channel to channel isolation is provided. 

MTL MTL4840 MTL4850 Series HART Connection Unit HCU16 

HCU16 HART connection unit The HCU16 HART connection unit - see Figures 4.6 & 4.7 - provides a connection interface between the field wiring and the onward link to the host/system control for non-hazardous areas. It also provides a take-off point for the HART signals to the maintenance system. Each channel has three terminals: +ve, -ve and a transmitter supply terminal (Tx +) – see Figure 4.6. The HART signal has to be terminated with an impedance of approximately 240W. Positions are provided on the circuit board to fit parallel resistors (normally 250W), or an appropriate series resistor to raise the impedance if it is < 240W. This unit can be used with analogue outputs if the system's current signal is compatible with HART communications. Connections to the field signals and the system are via screw-clamp terminals

MTL MTL4840 MTL4850 Series HART Connection Unit HCU16 

Mounting The HCU16 is designed for mounting in a control room equipment cabinet and is supplied fitted on a carrier suitable for T or G section DIN-rail mounting in any orientation. 

Carrier weight: 330g 

Footprint dimensions: See Figure 4.6 

Height: 53mm from top of DIN rail

MTL MTL4840 MTL4850 Series HART Connection Unit HCU16 

MTL MTL4840 MTL4850 Series HART Connection Unit HCU16