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Measurement Technology

Transit-Time technology uses a pair of transducers, each of which sends and receives a

coded ultrasonic signal through the fluid.

As the fluid flows, the signal transmission time in the downstream direction is shorter than

in the upstream direction; the difference in transmission time is proportional to the flow rate.

The AquaTrans AT868 measures this time difference and uses programmed pipe parameters

to determine flow rate and direction.

Hardware Tips and Specifications

The IS220PRTDH1A is an I/O pack designed to work in conjunction with a terminal board. 

It is approved for use within hazardous locations when used with specific terminal boards

like the IS200TRTDH2D, IS200SRTDH1A, or the IS200SRTDH2A. 

This unit has its own power supply. Only resistive simple apparatus like RTDs should be

connected to RTD inputs on the IS220PRTDH1A.

Wet or clamp-on sensors

Ultrasonic flow sensors are classified as wetted or non-wetted (clamp-on). Clamp-on sensors

are clamped to the outside of the pipe and do not come into contact with the process fluid.

Wetted sensors are mounted inside the pipe or flow meter and come into direct contact

with the process fluid.

Clamp-on sensors offer the greatest convenience and flexibility, as well as low installation costs,

compared to traditional flow metering technologies.

When properly installed, wetted sensors provide the highest accuracy (better than 1% of reading)

in most applications.

The AquaTrans AT868 Liquid Flow Ultrasonic Transmitter combines state-of-the-art flow

measurement capabilities with a low-cost transmitter package that can be mounted

directly at the process measurement point.

It can be installed directly at the process measurement point. It is designed for water

and wastewater applications in full pipelines.

The all-digital AquaTrans AT868 has no moving parts and requires minimal maintenance.

The on-board microprocessor utilizes patented Correlation Transit-Time™ technology for

long-term drift-free operation. Automatically adjusts to changing fluid characteristics and

dynamically configurable operating software simplifies programming.

Cabling used for these connections should have suitable insulation as specified in local electrical codes.

The front panel of the IS220PRTDH1A includes LED indicators for the I/O unit’s two ethernet ports, 

as well as a Power and an ATTN LED indicator.Ports are located on the side of the unit.

This unit weighs approximately 4.40 pounds before the addition of any sort of packing materials. 

Dimensions are 34 x 18 x 10 cm.

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