Introduction These loop-powered rate/totalizers can display rate up to five digits and total up to eight digits using the total overflow feature described below. The display can be programmed to automatically or manually toggle between rate and total. Standard features include a backlit display with bargraph, on-screen custom engineering units, max/min display and open collector output. There are two models available: the PD684 is for general-purpose applications and the PD689 is for hazardous area applications. Even with all the features packed into these meters, they're still easy to setup and get running. Everything is programmed from the front panel buttons with no pots or jumpers to deal with. In fact, these indicators can be scaled without a signal source for even quicker setup.

The PD684 and PD689 go just about anywhere with their shallow-depth case, FM Type 4X front, loop-powered backlighting, and wide operating temperature range. It doesn't matter if they're indoors or outdoors, in bright sunlight, or a dimly lit plant, wet, dirty, hot or cold. And the PD689, with its FM Approval and CSA Certification, can be installed in just about any hazardous location. Square root and programmable exponent functions are standard features on the PD684 and PD689. With these features, these indicators can display flow rate and total from a DP transmitter or open channel flow in weirs and flumes.

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