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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. SETUPThe only tools needed for calibration are a calibrated current source, a flat head screwdriver, and a phillips head screwdriver. Please note that the meter must be disassembled in order to perform the setup functions.DISASSEMBLYThe calibration controls are located behind the display faceplate. To access these controls, you must first remove the enclosure cover and faceplate by doing the following:PD660: Loosen the four screws on the enclosure cover and remove. Unscrew the two fasteners that hold the faceplate, then remove. PD661: Turn the enclosure cover counterclockwise to remove. Unscrew the two fasteners that hold the faceplate, then remove. ConnectionsField connections are made to the screw terminals located on the Input Signal Board. To access these screw terminals it is necessary to remove the Display Board from the Input Signal Board. First, disconnect the ribbon cable connector from the Display Board. Next, loosen the two screws located to the left and right of the LCD that hold the Display Board in place. Finally, remove the Display Board carefully to avoid contact with any rough surfaces.Connect a 4-20 mA input signal to terminal J5 located on the Input Signal Board as shown below.
DECIMAL POINT SELECTIONDecimal point selection is accomplished using JP1 located behind the faceplate to the right of the display. Leave jumper on one pin only for a display of 1999 (default), place the jumper over both bottom pins for a display of 199.9, middle for 19.99, top for 1.999CALIBRATIONThe LO control (R11) is located below the display and the HI control (R9) is located to the right of the display. Apply a 4 mA signal and adjust the LO control to display the desired reading. Next, apply a signal between 16 and 20 mA and adjust the HI control to display the desired reading. Complete the calibration by making any minor adjustments to the LO and HI controls. MOUNTINGPD660The PD660 can be wall mounted using the mounting holes beneath the cover screws. It can be panel mounted with the addition of the PDA6604 panel mount kit. It can also be pipe mounted by using the PDA6845 or the PDA6845-SS 2" pipe mounting kit. PD661The PD661 has no provisions for wall mounting. Installation of the unit is accomplished by using the two ½" NPT conduit holes provided with ½" NPT fittings.
SPECIFICATIONSInput: 4-20 mA @ 24 VDC maximumDisplay: 0.5" (12.7 mm) LCD, 3½ digits; 1999 Accuracy: ±0.1% FS ±1 count Decimal Point: User selectable decimal point Calibration: 2 step; non-interacting zero and span Calibration Range: 4 mA input: -500 to +500; 20 mA input: between 20 and 2000 above 4 mA display Maximum Voltage Drop: 1.5 VDC @ 20 mA; 3.5 VDC @ 20 mA with backlight option Display Update Rate: 2.5/second Loop-Powered Backlight Option: Factory installed only. Powered directly from the 4-20 mA loop, no batteries required. The display brightness will increase as the input signal current increases. Connections: Removable screw terminals accept 12 to 22 AWG Operating Temperature: -40 to 80°C Storage Temperature: -40 to 80°C Relative Humidity: 0 to 90% non-condensing Approvals: The PD661-N-EX and PD661-B-EX are FM Approved & CSA Certified as explosion-proof for Class I, Division 1, Groups B, C, & D; dust-ignition proof for Class II, Division 1, Groups E, F, & G; and Class III hazardous (classified) locations. PD660 Enclosure: Impact-resistant ABS plastic body, color: gray, clear polycarbonate cover with blue faceplate; NEMA 4X, IP67; ½" conduit hole provided at base. PD660 Weight: 9.3 oz (264 g) PD661 Enclosure: Explosion-proof, cast aluminum with glass window, 0.3% max copper content, corrosion resistant polyester powder coating, color: safety blue. NEMA 4X, 7, & 9, IP66; FM Approved & CSA Certified: Class I, Division 1, Groups B, C, & D, Class II, Groups E, F, & G, Class III hazardous outdoor (Type 4X) locations. Two ½" NPT holes provided; mounts directly to conduit. PD661 Weight: 3.1 lb (1.4 kg) Warranty: 2 years parts & labor Extended Warranty: 1 or 2 years Disclaimer The Information contained in this document is subject to change without notice. Precision Digital Corporation makes no representations or warranties with respect to the contents hereof, and specifically disclaims any implied warranties of merchantability or fitness for a particular purpose.
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DocumentationThe documentation can be downloaded from these links:
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