4-20 mA Collection from Aquametrix

The Aquametrix 4-20 mA Collection

This section is not a new category of products. Rather it is a grouping of sensors from our product line that all have a common feature—direct 4-20 mA output. These sensors have transmitters built into them that are powered by, and output to, a PLC. Since they do not require an external transmitter they are very cost effective. In two cases (the dissolved oxygen sensor and ultrasonic level transducer) they can also output a digital Modbus signal. All of them can be powered by an inexpensive 24 VDC power source and read by a panel meter.

They include the pH and ORP sensors that we make and probes that we sourced from a half dozen small manufacturers scattered around the country. Nonetheless there are advantages to keeping the transmitter separate from the sensor. Whether any of the following direct output sensors is right for your application depends on several factors. As the drug commercials say, “To find out if a sensor is right for you consult your sensor doctor--that’s us.”

The Aquametrix 4-20 mA Collection

P/R65 4-20 mA Output Differential pH/ORP Sensors

For added versatility, the P/R65C series, pH or ORP differential probes, are available with an integral encapsulated 4-20 mA two-wire transmitter to feed directly to a PLC or a DCS.

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AM-LDO Luminesescent Dissolved Oxygen

Aquametrix has been selling polarographic dissolved oxygen analyzers for over three decades. We are now pleased to be able to offer an optical dissolved oxygen sensor that outputs directly a 4-20 or Modbus signal. Optical DO sensors offer advantages over electrochemical DO sensors in that they are inherently self-referencing, require no warm-up period and do not require flow and are less affected by fouling.

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AM-HLT Hydrostatic Level Transducers

Hydrostatic Level transducers are simple, rugged and inexpensive level sensors with built-in 4-20 mA transmitters WIth an IP68 rating they are at home in everything from clean water to activated sludge and Class 1, Div 2 environments. Moreover we can customize every single sensor (included in the price) for the depth range you require.

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AM-UST Ultrasonic Level Transducer

The AM-UST is one of the most compact and cost-effective level transducers on the market. Inside a package about the size of a 1/4-DIN enclosure is a full feature ultrasonic transducer that outputs directly either a 4-20 mA analog signal or two Modbus over RS485 digital signals. The unit is powered by a 9 -36 VDC power supply.

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The Aquametrix AM-FCL is a direct output 4-20 mA sensor that connects to the AquaMetrix 2300 controller or to a PLC . For maximum accuracy add a variable area flow meter (AM-FCL-FM) and constant pressure flow cell (AM-FCL-FC). Automatic pH compensation can be accomplished by adding a pH probe to the PLC and adding software to perform the compensation.

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ES Series Toroidal Conductivity Sensors

Water Analytics ES series electrodeless conductivity sensors are used in processes where conventional contacting sensors may become fouled or corroded. Each sensors can be mounted in flow through applications or submersion mounted in tanks or open vessels.

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