Digital panel meters provide visibility, versatility

Digital panel meters provide visibility, versatility
Trident Series digital panel meter

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Trident Series digital panel meters and ProtEX-MAX explosion-proof meters (models PD765 and PD8-765) from Precision Digital Corp. feature two relays, 4-20mA analog output and 24-volt DC power supply in one meter. The PD765 is housed in a 3.6-inch deep, 1/8 DIN enclosure with NEMA 4X front panel. Two display heights are available: 0.56 inch (Trident) and 1.2 inch (Trident X2).

Each display is adjustable to lighting conditions, including direct sunlight. The Trident X2 meter can be read from 30 feet. For hazardous applications, the PD8-765 has an explosion-proof, die-cast aluminum enclosure with through-glass Safe Touch buttons and worldwide safety approvals.

“Because both of the products use the same electronics at their core, they share the same unique characteristics,” says Joe Ryan, product marketing engineer for Precision Digital Corp. “The most prominent is the availability of our PD765 X2 models with the 1.2-inch display on the front.”

Ryan says the larger display is essential for operators who need to be aware of ongoing processes or critical measurements. “You need a display that’s large enough and bright enough to be viewed in sunlight and one that operators are going to notice in a control panel full of other, less relevant, information.”

The meters can be field programmed to accept process voltage and current inputs, 100 Ohm RTS RTD and the four most common thermocouples: J, K, T, and E. Power options include 85 to 265 VAC or 12 to 36 VDC. It also can provide 24 VDC to power the transmitter, if needed.

“The Trident is capable of taking in a process or a temperature input,” Ryan says. “Let’s say you have a filtration panel. You might have flow rates and differential pressures in the filtration system that need to be used by the operators, and you’ve got a flow meter, maybe with a display, and differential pressure transmitter with a 4-20mA output. Well, operator is obviously not right at the flowmeter site, and the DP meter needs a display. The Trident accepts the 4-20mA signals from the transmitters and displays them on the filtration panel. If water temperature is critical, a Trident also can be used to accept the RTD or thermocouple probe directly, so you’re taking the 4-20mA filtration panel and displaying it on the Trident.”

The Trident meter can be used in level applications to display data from transmitters at underground sumps and wells or aboveground water storage tanks to a meter that can be mounted at eye level next to the tanks and sumps or at a central monitoring station. The meters also can be connected to any flow, level, temperature or pressure transmitter. 800/343-1001; www.predig.com.



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