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简单介绍：
Description: Explosion-Proof Rate/Totalizer
Input: 4-20 mA
Display: 0.7" (18 mm) Backlit LCD 5 Digits
Case: Die-Cast aluminum explosion-proof enclosure
Power: Loop-Powered
详情介绍：
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FEATURES
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OVERVIEWThe ProtEX-RT PD6820 is a rugged, explosion-proof loop-powered rate/totalizer fully featured for demanding applications in hazardous areas or in the harshest environmental conditions. Users need a display to provide important process information and the display on a transmitter is often too small and mounted in a hard to see area. The PD6820's display is designed to be big, bright and easy to read from a wide variety of angles. It is programmed using four SafeTouch™ through-glass buttons without removing the cover, and can be scaled with or without a calibration signal. The lower alphanumeric display can be programmed to show any combination of numbers and letters up to seven characters long for use as engineering units and/or the process identification tag. The bright white backlight helps you see the display under any lighting condition KEY FEATURESUser Friendly DisplayThe high contrast 0.7" high 5-digit LCD on the upper display is easy to read. The 0.4" 7-character lower display is alphanumeric and allows for more sensible looking tags, engineering units, or legends than a 7-segment display. For dark areas, the backlight (standard) can be illuminated either with loop power, or an external 9 to 30 VDC.Through-Glass SafeTouch™ Buttons The PD6820 is equipped with four sensors that operate as through-glass buttons so that it can be programmed and operated without removing the cover (and exposing the electronics) in a hazardous area. These buttons can be disabled for security by selecting the LOCK setting on the switch located on the connector board in the base of the enclosure. To actuate a button, press one finger to the glass directly over the marked button area. When the cover is removed, four mechanical buttons located next to the sensors are used.WIDE VIEWING ANGLEExceptional Enclosure Wide Viewing Angle The copper-free (0.3%), smooth die-cast aluminum NEMA 4X enclosure is finished with a corrosion resistant epoxy coating. This provides a durable finish, and helps make it an attractive looking enclosure. The built-in mounting flanges are convenient for wall or pipe mounting (up to 2½" pipes). The enclosure is provided with two ¾" NPT threaded conduit holes. The window and display module on the PD6820 enclosure have been optimized to provide a wide viewing angle of approximately +/- 40°, nearly twice the competition! This makes it even easier for operators to see the display. Isolated Open Collector OutputThe isolated OC output on the PD6820 may be assigned for use with the alarm or totalizer (pulse output). The rating of the output is 30 VDC @ 150 mA max.AlarmThe PD6820 can be configured to have a high or low rate alarm indicator, or a total alarm trip point indicator. The OC output is available for use as an alarm output. When in alarm mode, the display will flash, and a HI or LO symbol is displayed. The alarm has an adjustable deadband and is acknowledged by pressing the ENTER/ACK button.Totalizer Pulse OutputThe totalizer pulse output function requires use of the OC output. It will output a pulse at a user adjustable pulse rate, and can be scaled with a K-factor of between 0.0001 and 99999. Example: For 1 pulse every 500 gallons, set the K-factor to 500. This output can be sent to a PLC or counter.Totalizer Conversion FactorTotal Conversion Factor is used to convert to a different unit of measure for the total display. For example, to display rate in gallons and total in liters, enter a conversion factor of 3.7854. When rate and total units are the same, the Conversion Factor should be 1.0000.Password ProtectionA 5-digit password prevents unauthorized changes to the programmed parameter settings. The lock symbol is displayed to show that settings are protected. If the meter is password protected, the meter will display the message LOCKED when the Menu button is pressed.Design SimplicityThe internal cast rails within the enclosure replace fragile stand-offs. They also guide and mount the internal module. Two spring-loaded thumbscrews make the assembly a snap, while pressing the LCD as close as possible to the glass window to help with wide-angle viewing. ADVANCED FUNCTIONSThere are three available advanced functions on the PD6820. Those are: linearization, square root, and programmable exponent. The square root function is primarily for differential pressure (flow), and the programmable exponent is for open channel flow (weirs and flumes).Multi-Point LinearizerThe PD6820 has a linearizer which can be assigned to any two points within the input function range for best fit. The scale will follow the linearization slope to the limits of the analog input, or to its full 4-20 mA input capability. The user can also scale the meter to have an inverse relationship to the input.Square Root ExtractionThe square root extraction function 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 zero when the flow rate drops below a user selectable value.• Displays Flow Rate • User Selectable Low-Flow Cutoff • Only 2 Calibration Points Required  Programmable ExponentThe programmable exponent function is used to linearize the level signal in open channel flow applications using weirs and flumes and display flow rate & total, units of measure, or toggle between total and units of measure. INSTALLATIONInstallation FlexibilityThe PD6820's rotatable display/meter module along with two available conduit connections provide for numerous installation options. The display can be rotated in 90° increments. Rotate it 90° for horizontal mounting. Wiring can then be routed to either the top conduit connection, or from below to the opposite conduit connection (metal conduit plug supplied). Use both conduit connections for through-wiring in any plane. Easy Wiring & ServiceUnscrew the two captured thumb screws and unplug a connecting cable and the display/meter module is simply and completely removed. A heavy duty terminal block is then easily accessed and wired. It is clearly marked to prevent wiring errors. The display/meter module can be removed without breaking the loop. As such, it can be serviced without the need to uninstall the entire product. CONNECTIONS SPECIFICATIONSExcept where noted all specifications apply to operation at +25°C.GeneralDisplay: Upper: Five digits (-9999 to 99999) 0.70" (17.8 mm) high, 7-segment, automatic lead zero blanking. Lower: Seven characters 0.4" (10.2 mm) high, 14 segment alphanumeric. Symbols: for high & low alarm, password lock. Backlight: whiteDisplay Update Rate: Ambient > -25°C: 2 Updates/Second. Ambient < -25°C: 1 Update/5 Seconds Overrange: Display flashes 99999 Underrange: Display flashes -9999 Programming Method: Four SafeTouch™ through-glass buttons when cover is installed. Four internal pushbuttons when cover is removed. Noise Filter: Programmable Lo, Med, Hi, or Off Recalibration: Recalibration is 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. Advanced Functions: 32-Point, Square Root, or Exponential Linearization Non-Volatile Memory: All programmed settings are stored in non-volatile memory for a minimum of ten years if power is lost. Normal Mode Rejection: 64 dB at 50/60 Hz Operating Temperature Range: -40 to 75°C. Storage Temperature Range: -40 to 85°C. Relative Humidity: 0 to 90% non-condensing Connections: Screw terminals accept 12 to 22 AWG wire Enclosure: Explosion-proof die-cast aluminum with glass window, corrosion resistant epoxy coating, color: blue. NEMA 4X, 7, & 9, IP68. Copper-free (0.3%). Two ¾" NPT threaded conduit openings. One ¾" NPT metal conduit plug with 12 mm hex key fitting installed. Mounting: May be mounted directly to conduit. Two slotted flanges for wall mounting or NPS 1½" to 2½" or DN 40 to 65 mm pipe mounting. Overall Dimensions: 5.65" x 5.25" x 4.86" (W x H x D) (144 mm x 133 mm x 124 mm) Weight: 5.00 lbs (80 oz, 2.27 kg) Warranty: 3 years parts and labor InputInput range: 4-20 mAAccuracy: ±0.03% of calibrated span ±1 count, square root & programmable exponent accuracy range: 10-100% of calibrated span. Temperature Drift: 50 PPM/°C Decimal Point: User selectable decimal point Calibration Range: An error message will appear if input 1 and input 2 signals are too close together. Maximum Voltage Drop: 3.0 VDC @ 20 mA without loop-powered backlight. 6.0 VDC @ 20 mA with loop-powered backlight Equivalent Resistance: 150 Ω @ 20 mA without loop-powered backlight. 300 Ω @ 20 mA with loop-powered backlight Input Overload: Over current protection to 2 A max. Externally Powered Backlight:
Open Collector OutputRating: Isolated open collector, 30 VDC @ 150 mA max.Alarm Output: Assign as rate alarm or total alarm trip point. Deadband: 0-100% FS, user selectable Acknowledge: Front panel ACK button resets output and screen indication. Pulse Output K-Factor: K-factor programmable from 0.0001 to 99999. Pulse Output Frequency: 2, 4, 8, 16, 32, 64, 128 Hz. Minimum pulse width: 3.9 ms @ 128 Hz. Maximum pulse width: 250 ms @ 2 Hz. Factory default pulse width: 31 ms @ 16 Hz Rate/TotalizerRate Display: 0 to 99,999 leading zero blankingTotal Display: 0 to 9,999,999 leading zero blanking Total Decimal Point: Up to six decimal places or none: d.dddddd, d.ddddd, d.dddd d.ddd, d.dd, d.d, or ddddddd Lower Display Configuration: Can be programmed to display total, tag name/engineering units, or to alternate between them. Totalizer: Calculates total based on rate, time base of second, minute, hour, or day, and field programmable multiplier; stored in non-volatile memory upon power loss. Totalizer Reset: Via front panel SafeTouch™ button, time delay, external contact closure, or protected Total Conversion Factor: 0.000001 to 9,999,999 Totalizer Rollover: Display rolls over when display exceeds 9,999,999. Relay status reflects the displayed value. Total Reset Delay: Programmable from 0 to 99,999 seconds Product Ratings & ApprovalsFM: Explosion-proof for use in Class I, Division 1, Groups B, C, D. Class II, Division 1, Groups E, F, G. Class III, Division 1; T6. Class I, Zone 1, AExd IIC T6 Gb. Zone 21, AEx tb IIIC T85°C. Ta = -40 to 75°C.Enclosure: Type 4X & IP66. Certificate number: 3040391 ATEX: II 2 G D. Ex d IIC T6 Gb. Ex tb IIIC T85°C Db IP68. Ta = -40 to 75°C. Certificate number: Sira 10ATEX1116X IECEx: IECEx SIR 10.0056X. Ex d IIC T6 Gb. Ex tb IIIC T85°C Db IP68.Ta = -40°C to +75°C CSA: Enclosure: Type 4X & IP66. Class I, Division 1, Groups B, C, D. Class II, Division 1, Groups E, F, G. Class III, Division 1; T6 Class I, Zone 1, Ex d IIC T6. Ta = -40°C to +75°C Certificate number: 11 2325749 DIMENSIONS |
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