Friday, 31 May 2013

Frequency/pulse input Transmitters.

USB-configured transmitters with a model that provides a process current or voltage output proportional to the frequency of a pulse or waveform input signal

Acromag’s new TT339 frequency transmitter converts the rate of pulsed, sinusoidal and other periodic waveform input signals to a proportional 0-20mA, 0-10V, or ±10V DC output. This versatile signal conditioner accepts unipolar and bipolar input signals with amplitudes up to 120Vrms (±170V DC) and frequencies up to 100KHz.Setting your input/output ranges and other operating parameters is extremely easy using a PC with free configuration software and a convenient USB connection to the transmitter. Common uses involve monitoring power line frequency, flow rates, rotational speed, and periodic events. A flexible power requirement (12-32V DC), wide temperature range (-40 to 80°C), and rugged design make the TT339 ideal for many applications, even in hazardous locations (Class 1, Div 2, Zone 2).

“The TT339 is very easily tailored to satisfy your unique requirements for frequency monitoring with precise software control over input/output scaling, thresholds, sample averaging, update rates as fast as 10ms, and other settings,” asserts Don Lupo, Acromag’s sales and marketing director for process products. “By simplifying entry of your desired values, Acromag can deliver greater flexibility and better performance than competitors with limited DIP-switch settings or burdensome zero/span pots.”

Supported input types include power mains, magnetic pickups, rotary encoders, flow meters, TTL logic, NPN/PNP transistors, proximity switches, and dry contact closures. Software speeds selection of operating parameters. Picklists help choose bipolar (zero-crossing) or unipolar threshold with hysteresis levels, enable pull-ups, and activate sensor excitation. A 0Hz cutoff field sets the lowest input frequency that will produce a non-0Hz measurement. User-defined sample averaging can compensate for uneven frequencies. Output range options are ±20mA, 0-20mA, 4-20mA, ±10V, 0-10V, ±5V, and 0-5V with approximately 5% over/under-range capability built-in. For precise I/O scaling, you can directly enter min/max input frequencies for the zero and full-scale output signal levels, as well as the update rate.

Installation of this DC-powered 4-wire transmitter is fast and simple with front-facing removable terminal blocks. The slim design fits in tight spaces and enables high-density mounting. Units attach quickly to a DIN rail with a spring clip. An integrated rail power bus connector supports primary or redundant power from a shared supply across multiple units. Transmitters snap together side-by-side connecting the power bus to save time and minimize wiring.

Rugged design ensures reliable operation in hostile environments. The TT339 performs dependably with ambient temperatures ranging from -40 to 80°C (-40 to 176°F). High-voltage isolation (1500V AC peak, 250V AC continuous) between input, output and power circuits eliminates ground loops, suppresses noise, and provides surge protection. These units can also withstand shock (5g) and vibration (50g) without effect. CE certification and UL/cUL Class 1 Division 2 Zone 2 hazardous location approvals are pending. Built in the USA to AS9100 aerospace and ISO 9001 certified quality control standards and backed by a 7-year warranty, you can rely on Acromag’s TT339 transmitters for long-lasting superior performance, even under the toughest conditions.

The USB-to-PC connection for software-driven configuration makes setting ranges and calibration easier, more accurate, and very reliable. Many competing units use DIP switches that can only offer coarse range settings, not fine adjustments. Using trim pots can allow fine tuning, but they require far more time to achieve the desirable results. With a USB port, you can digitally set the calibration gain and offset using precision D/A converters whereas DIP switches and pots can change values over time or due to temperature/shock/vibration. These changes can lead to drift and require periodic re-calibration. And once configured, the device’s settings can be archived in a file or uploaded quickly into additional units for rapid cloning in large systems. Later, a device’s USB port enables diagnostic communication using software while a unit configured with DIP switches or pots cannot. Plus, USB-configured devices use fewer mechanical parts which increases long-term reliability.

Acromag has designed and manufactured measurement and control products for more than 50 years. With a headquarters near Detroit, Michigan and a global network of sales representatives and distributors, Acromag products are sold worldwide. They offer a complete line of industrial I/O products including process instruments, signal conditioning equipment, data acquisition boards, distributed I/O modules, and network communication devices. Industries served include manufacturing, water services, power generation, mining, defense, and transportation.

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