MTL7760AC MTL Instruments Analogue Inputs Low-level Barrier

Slidewire displacement transducers

The simplest choice is the MTL7760ac. This barrier supplies power and brings back a unipolar signal.

RTDs

For 3-wire RTDs, a single MTL7755ac barrier is the most economical choice. This is suitable for use with a floating bridge – the two leads from the bridge arms are protected by the barrier with the third (supply) lead being earthed through the barrier. The barrier has a low end-toend resistance of only 19Ω/channel to minimise span changes and its channels track within 0.15Ω (between –20°C and +60°C) to minimize zero shift with temperature.

If the bridge circuit is already earthed, the third barrier channel provided by an MTL7756ac is needed. For extreme accuracy, 3 channels and an earth-free bridge can be used, a configuration that cancels out the small errors due to barrier leakage.

Channels 1 and 2 (those between terminals 1 & 2 and 3 & 4 respectively) track to within 0.15Ω (between –20°C and 60°C).

4-wire constant-current circuits do not need matched barrier resistances and can be protected by two MTL7761ac barriers. If the increase in loop resistance is too great, use two MTL7755ac barriers instead.

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Company Introduction

Great System In.(GSI) a name synonymous with Process Control Instrumentation and Electrical and Instrument and Solution Provider have established themselves as a Quality Leader since its inception in 1998 based at Hong Kong ( China ).

Great System In.(GSI) a name synonymous with Process Control Instrumentation and Electrical and Instrument and Solution Provider have established themselves as a Quality Leader since its inception in 1998 based at Hong Kong ( China ).

For more than 25 years, we have successfully executed many prestigious orders by supplying Sophisticated Electronic Instruments and Control Systems and HT Panel and LT and Panel. Indigenization of the instruments of our product range have been in hand with our commitment to the manufacture of safe, reliable and quality instrument. Our thrust today is in the field of microprocessor based instrumentation and control systems. A knowledge inspiring and skilled arena that we are in, we are staffed to meet the dictates of the field and thus can provide various control and monitoring software packages for Instrumentation and control.

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