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.
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 PD683 and PD688 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 PD688, with its FM approval and CSA certification, can be installed in just about any hazardous area environment.
Square root and programmable exponent functions are standard features on the PD683 and PD688. With these features these indicators can display flow from a DP transmitter or open channel flow in weirs and flumes.
Through significant innovations in technology and design, we developed the Loop Leader® Series of loop-powered indicators which are loaded with standard features and built for tough industrial environments
Full Featured There's nothing stripped down or bare bones about these indicators; they are designed for demanding process control applications. Standard features include a full 5-digit backlit display with bargraph, on-screen custom engineering units, and min/max capabilities.
Install Just About Anywhere Indoors, outdoors, bright sunlight, dimly lit plant, wet, dirty, hot or cold- these indicators go just about anywhere. Their shallow-depth case, FM Type 4X front, loop-powered backlighting, and wide operating temperature range are all standard features. And the PD688 with its FM Approval and CSA Certification can be installed in just about any hazardous location
Square Root Function
Square Root Function The square root extraction feature displays flow rate by extracting the square root from a differential pressure transmitter signal. The user selectable low-flow cutoff feature gives a reading of
The programmable exponent function is used to linearize the level signal in open channel flow applications using weirs and flume and display flow and display flow rate in engineer.
Setup & Programming
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 meters can be scaled without a signal source for even quicker setup.
Press Menu button to enter Programming Mode then press Up arrow button to scroll main menu.
Press Menu button, at any time, to exit and return to Run Mode. Changes made to settings prior to pressing Enter/Ack button are not saved.
Changes to the settings are saved to memory only after pressing Enter/Ack button.
The display moves to the next menu every time a setting is accepted by pressing Enter/Ack button.
Advanced Menu Features
To simplify the setup process, functions not needed for most applications are located in the Advanced features menu. Press and hold the Menu button for five seconds to access the advanced features of the meter
PD683 Safe Area Wiring
PD688 Intrinsically Safe Wiring
Installation must be performed in accordance with Control Drawing LIM688-2
There is no need to remove the meter from its case to complete the installation, wiring, and setup of the meter.
Panel cutout required: 1.772 x 3.622 (45 x 92)
Panel thickness: 0.040 0.250(1.0 6.4)
Mounting brackets lock in place for easy mounting
Optional Field Enclosures
Enclosures available for one to six meters
PDA2706 NEMA 4 Enclosure Shown with Six PD683 Meters
PDA2801 Low-cost NEMA 4X Enclosure Shown with One PD683
Display: Five digits: -99999 to 99999, 0.60" (15.2 mm) high, 7-segment, automatic lead zero blanking. Engineering Units: 0.25" (6.4 mm) high, 14-segment. Bargraph: 20-segment, 0% to 100% indication. Trend arrows: Up and down trend indication. Backlight: Bright orange (intensity varies with signal) Display Update Rate: 2.5/second Overrange: Display flashes 99999 Underrange: Display flashes -99999 Programming Method: Four front panel buttons Noise Filter: Programmable from 1 to 199 Recalibration: Recommended at least every 12 months. Max/Min Display: Max/min readings reached by the process are stored until reset by the user or until power to the meter is turned off. Password: Programmable password restricts modification of programmed settings. Non-volatile Memory: All programmed settings are stored in non-volatile memory for a minimum of ten years if power is lost. Voltage Drop: 2.0 V max w/o backlight, 5.7 V max with backlight Equivalent Resistance: 125 Ω @ 20 mA w/o backlight, 315 Ω @ 20 mA with backlight Normal Mode Rejection: 64 dB at 50/60 Hz Operating temperature range: -30 to 65°C Allowable Temperature Range: -40 to 65°C*
(see note below) Storage temperature range: -40 to 65°C Relative humidity: 0 to 90% non-condensing Connections: Screw terminals accept 12 to 22 AWG wire Enclosure: 1/8 DIN, high impact plastic, UL 94V-0, color: gray Mounting: 1/8 DIN panel cutout required. Two panel mounting bracket assemblies provided Tightening Torque: 4.5 lb-in (0.5 Nm) Screw terminal connections Overall Dimensions: 2.45" x 4.68" x 4.19" (62 x 119 x 106 mm) Weight: 5.7 oz (162 g) Warranty: 3 years parts & labor
Input Range: 4-20 mA Accuracy: ±0.03% of span ±1 count, square root and programmable exponent: 10-100% FS Calibration: Scale without signal or calibrate with signal source Calibration Range: User programmable over entire range of meter Minimum Span: 0.40 mA between input 1 and input 2 Note: An Error message will appear if input 1 and input 2 signals are too close together Input Overload: Over current protection to 2 A max. Decimal Point: Up to four decimal places (d.dddd, dd.ddd, ddd.dd, dddd.d, or ddddd) Function: Linear, square root, or programmable exponent Low-Flow Cutoff: -99999 to 99999 (-99999 disables cutoff function) Temperature Drift: 50 PPM/°C from -40 to 65°C ambient
* Below -30°C the LCD becomes less readable. See application note AN-1005
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.
PD688 Approvals for Hazardous Locations
FM Approved & CSA Certified as intrinsically safe with entity for use in Class I, Div 1, Groups ABCD; Class II, Div 1, Groups EFG; Class III, Div 1; Class I, Zone 0, Group IIC; T-code = T4. Non-incendive: Suitable for use in Class I, Div 2, Groups ABCD; Class II, Div 2, Groups FG; Class III, Div 2. Entity Parameters: Ui: 30 V; Ii:175 mA; Ci: 0; Li: 0; Pi: 1.0 W
ATEX II 1G, Ex ia IIC T4, IP65, Ta = -40°C to 65°C
Note: Installation must be performed in accordance with Control Drawing LIM688-2