Loop Leader PD6620 Series Loop-Powered Rate/Totalizer Instruction Manual
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Introduction
These loop-powered 1/8 DIN flow rate/totalizers can be installed virtually anywhere to provide convenient
and informative display of flow rate and total from a 4-20 mA signal. One of the most convenient features
of these instruments is their ability to display both flow rate and total at the same time. For instance, flow
rate is typically displayed on the 5-digit alphanumeric top line and flow total or grand total is typically dis-
played on the 8-digit alphanumeric bottom line.
Both of these lines use 14-segment, alphanumeric characters for clear indication of tags, units or alarm
messages. Further enhancing the display on these instruments is a 20-segment bargraph available on
the PD6624/8 that also includes a numeric value of the percentage the bargraph represents.
These flow rate/totalizers can be installed virtually anywhere because they get their power from the 4-20
mA loop and therefore require no separate power source. And they only drop 1.5 V (4.7 V with backlight),
so they add very little burden to the loop. Additional features that allow these instruments to be installed
virtually anywhere include a NEMA 4X, IP65 front panel, an operating temperature range of -40 to 167°F
(-40 to 75°C) (for safe area products), conformally coated PCBs, and a backlit LCD that can be read in
bright sunlight or dimly lit areas. Finally, there are intrinsically safe and nonincendive versions of these
instruments that can be installed in hazardous areas.
Free, PC-based, software that connects to the meter via a micro USB cable is available for programming
and setup of the meters. In addition, the meter can be programmed, setup and operated via the four front
panel buttons. Three of these buttons can be used as function keys. In addition, a digital input is standard
and is particularly useful for remote reset of the total or to start/stop a timer/batch.
All models come equipped with two open collector outputs and are available with two solid state relays
and 4-20 mA analog output options. The open collector outputs are useful for alarm indication or sending
a pulse to indicate when a certain amount of total has been accumulated. The relays can be programmed
for alarm indication, on/off control, sample taking, or simple batch control.
