Precision Digital Corporation products

Loop-Powered Meters

Loop Leader Intrinsically Safe Loop-Powered Meters

There`s nothing stripped down or bare bones about these intrinsically safe, loop-powered meters, designed for demanding process control applications. Standard features include a full 5-digit backlit display with bargraph, on-screen custom engineering units, and max/min display capabilities. There are two models available: the PD683 is for general-purpose applications and the PD688 is for hazardous area applications.

Explosion Proof Products

ProtEX-Lite - Explosion-Proof Loop-Powered Meter

The PD663 is a rugged, explosion-proof NEMA 4X loop-powered meter perfect for applications where a simple, inexpensive display is required in a hazardous area. The PD663 derives all its power from the 4-20 mA loop. The PD663 is scaled using four push buttons and can be done without applying an actual calibration signal, and through the explosion-proof enclosure with optional magnetic reed switches and a magnet key. The PD663`s display will read up to 2999; we call this 3½+ digits! The loop-powered backlighting option lets you see the display under any lighting condition and is powered completely from the 4-20 mA loop. This means there is no need for additional wiring and never any batteries to change. The PD663 is housed in a rugged, explosion-proof, cast aluminum, NEMA 4X enclosure and is provided with two threaded conduit holes, one factory installed metal conduit plug, and integrated 1.5` inch pipe or wall mounting flanges.

Steam boiler temperature panel

This customer has several hundred Trident meters located throughout their facility. The meters on this panel are displaying various temperatures and a pressure and a valve position

PD685: 3½ Digit NEMA 4X

The PD685 is a low-cost, NEMA 4X, loop-powered indicator that is easy to install and program and can be seen from considerable distance. It will operate over a wide temperature range meaning it can be installed both indoors and out. And the PD685`s 1 V drop results in a minimal burden on the loop. Calibration is a quick two-step process involving the adjustment of only two non-interacting potentiometers.

Volume for Non-Linear Tanks

Precision Digital has products that can display volume in just about any shape tank. These products include Precision Digital meters, Fluidwell products and the ConsoliDator. All of these products allow the user to enter multiple calibration points to linearize the non-linear aspect of the tank. In addition, these products can provide relays for control and alarm purposes, power to the transmitter, and linear 4-20 mA output.

Boiler Drum Level

The PD650 monitors and controls the boiler drum level and displays it on a large, easy to read digital display that can be seen at great distances.

PD661: 3½ Digit Low Cost Explosion-Proof

The PD660 and PD661 3½ digit loop-powered meters are perfect for applications where a simple inexpensive display is required and no AC power is available. And even if the lighting is poor, the loop-powered backlighting option lets you see the display under any lighting condition. This option gets its power from the 4-20 mA input loop so there is no need for additional wiring and no batteries to ever change. The PD660 and PD661 are housed in rugged NEMA 4X and Explosion-proof enclosures so they can be mounted virtually anywhere. The PD661-N-EX and PD661-B-EX have been FM Approved and CSA Certified as explosion-proof as complete products - not just the enclosures.

PD543: 1/8 DIN (H) Heating and Cooling

Thermocouple, RTD, & Process Inputs High Accuracy Auto-Tuning PID Heating & Cooling Models Universal Power Supply 100-240 VAC Up to 3 Relays & 2 Analog Outputs Digital Input Set Point Selection RS-485 Serial Communications Option Modbus RTU/ASCII Communications Free Operating & Data Logging Software IP55 & IP65 Fronts 1/16, 3/16, 1/8, 1/4 DIN Sizes 3 Year Warranty

PD541: 1/16 DIN Heating and Cooling

Vacuum measurement in power plant

The indicators are not just for good looks but they serve an important function when the operators are pulling bottom ash. The controls for the vacuum pumps are remote from the boiler fronts and the pumps them-selves are on sixth floor while the indicators are on grade floor. The indicators display bottom ash vacuum so the operators have instant status of the vacuum system running. The large indicator was our solution to help the operators and help prevent plugging the system when ash was being ‘pulled’.