These intrinsically safe and non-incendive, loop-powered 1/8 DIN digital panel meters can be installed virtually anywhere to provide convenient and informative displays of any 4-20 mA signal. One of the most convenient features of these instruments is their dual line display which is typically used to display the process variable on the 5-digit alphanumeric top line and the units or a tag on the 8-digit alphanumeric bottom line. Another common setup is to display the input in one scale on the top line (such as feet) and another scale on the bottom line (such as gallons). 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 PD6608 that also includes a numeric value of the percentage the bargraph represents. There is even a model that displays the level in feet and inches for customers who prefer to see their levels represented that way rather than in decimal format.
These loop-powered meters 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 158°F (-40 to 70°C), conformally coated PCBs, and a backlit LCD that can be read in bright sunlight or dimly lit areas. Finally, they are intrinsically safe and nonincendive, so they 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 alarms or to trigger an alarm.
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 pulse output. The relays can be programmed for alarm indication, on/off control, or pump alternation.
4-20 mA Input
Loop-Powered Process Meter
1.5 Volt Drop (4.7 Volt Drop with Backlight)
Loop-Powered Backlight with Red Backlight for Alarm Conditions
NEMA 4X, IP65 Front
-40 to 158°F (-40 to 70°C) Operating Temperature Range
Free PC-Based USB Programming Software
5-Digit Alphanumeric Top Line
8-Digit Alphanumeric Bottom Line
Displays Level in Feet & Inches up to 999 Feet, 11 & 15/16 Inches
20-Segment Bargraph with Numeric Percent Indication
Conformal Coated PCBs for Dust & Humidity Protection
Two Open Collector Outputs Standard
Optional Loop-Powered Solid State Relays
Optional 4-20 mA Analog Output
Relay Pump Alternation Based on Level and Runtime
Display Relay Runtime and Cycle Count
UL & C-UL 61010 Listed for Electrical Safety
UL & C-UL Listed as Intrinsically Safe and Nonincendive
ATEX and IECEx Certified as Intrinsically Safe
The Loop Leader’s display provides multiple ways to help users understand and keep track of their processes. The most obvious is the dual line which typically allows the user to display a numeric value of the process variable on the top line and units and/or a tag on the bottom line. There is also a bargraph that includes a numeric value of the percentage the bargraph represents. Finally, to alert users to an alarm condition, the display can turn red and flash an alarm message.
Dual-Line Display with PV/Units/Tag/Bargraph
One of the most common configurations of these instruments is displaying the process variable on the top line and units and a tag toggling on the bottom line with a bargraph for additional clarity:
PV on the top line; units and tag toggling on the bottom line
To help users get a quick understanding of where their process is at, certain Loop Leader skus are available with a 20-segment bargraph. This bargraph also includes a numeric value of the percentage the bargraph represents.
Bargraph Provides Quick Understanding
To help users get a quick understanding of where their process is at, certain Loop Leader skus are available with a 20-segment bargraph. This bargraph also includes a numeric value of the percentage the bargraph represents. The bargraph can be programmed to represent the percent of PV1 or PV2 or it can be scaled to any range within the scale.
The max & min readings (peak & valley) reached by the process can be displayed either continuously or momentarily:
Display momentarily by pressing the F1 key (default) or assigning to any of the other function keys or to the digital input in the User menu. Press Enter to lock/unlock max/min display.
Display continuously by assigning either display line to max/min through the Display menu.
Any of the F1-F3 function keys (buttons) and the digital input can be programmed to reset the max & min readings.
Dual-Scale Display Feature
Users can use the Loop Leader’s dual-scale feature when they want to show the same input in two different scales. For instance, the following example shows an application where the Loop Leader displays the input in feet and gallons:
Display Feet & Gallons and Toggle Between Units
Feet & Inches Display with Bargraph
There are Loop Leader skus available for users that prefer to see their level displayed in feet & inches instead of decimal format. These versions can display level to 999FT 11IN & 15/16 on the top line. The bottom line can toggle between a tag and units or if dual scale mode is used, can display the input in a different scale such as volume.
Level in Feet & Inches with Bottom Line toggling between volume (62,346), and units (Gallons)
Predefined and Custom Units
The meter has six available preprogrammed unit classes, volume, height, temperature, pressure, weight, and rate. When the desired unit class or unit of measure within a class is not available, a custom unit may be programmed by using the (CUSTOM) menu.
The tare function zeroes out the display. In the case of scale weight, tare is used to eliminate container weight and provide net weight readings. The captured tare may be reset manually with any function key or digital input.
Change Between Units without Needing to Re-Scale the Meter
It is possible to change the display units within the selected unit class without the need to re-scale the meter. When selecting a new unit from within the DISPLAY menu (e.g. changing from gallons (GAL) to litres (L)), the meter will automatically convert the display values to display the new unit. If entering a custom unit (CUSTM), a custom conversion factor will need to be entered.
Alarms Indicated by Flashing Red Messages
When an alarm occurs, the Loop Leader’s display can be programmed to turn red and flash an alarm message along with the process variable and an alarm indicator (!). (Alarm indicator symbols are not available on bargraph skus) The Loop Leader’s flashing red alarm message can be activated even if no relay or open collector is connected.
Loop Leaders are available with two open collector outputs as standard and two solid-state relays and 4-20 mA output as options. The open-collector outputs and relays generally operate in the same manner, with the major exception being the open collectors are not available for pump alternation and the relays are not available with pulse features. The open collectors and relays can be controlled either automatically or manually. The alarm status (with flashing red message) will show on the display even with no output wired.
Two Open Collector Outputs
The Loop Leader is equipped with two NPN open collector outputs that may be set up for pulse outputs, alarms, timed pulses, stopwatch on/off, or disabled. Pulse outputs can be set to transmit the PV value (PV1 or PV2 if meter is in dual-scale mode). Output 2 may be used to generate a quadrature output based on the other open collector output. An output test mode is also selectable to generate pulses at a constant programmable frequency.
Two Optional Solid State Relays
The meter is optionally equipped with two solid-state relays that may be set up for alarms, timer, stopwatch on/off, or pump alternation. The relays are rated at 250 VAC/DC @ 1 A for resistive loads and 75 VA @ 0.6 A, 250 VAC/DC max (Safe Area only) for inductive loads. Alarms are available based on the PV value or digital input.
Loop-Powered Relay Alarm Trip for General Purpose & Hazardous Areas
The Loop Leader, with its two solid-state relays, can be used as a loop-powered relay alarm trip in both general purpose and hazardous areas. The Loop Leader’s two relays can be programmed for two different kinds of latching operation: Reset via momentary contact closure at any time or reset via momentary contact closure only after the alarm has cleared. And the Loop Leader’s display can be programmed to turn red and flash an alarm message – something not found on most loop-powered alarm trips.
Optional Isolated 4-20 mA Output
The isolated analogue output signal can be configured to represent the process variable (PV1, PV2, or retransmit). While the output is nominally 4-20 mA, the signal will accurately accommodate underand over-ranges from 1 to 23 mA. The output can be reverse scaled such that the meter’s high calibration value outputs 4 mA and the meter’s low calibration outputs 20 mA.
Resetting the Open Collectors and Relays
The open collectors and relays (alarms) may be programmed to reset in the following ways:
Automatic (AUTO): Alarm will reset automatically once the alarm condition has cleared.
Automatic/Manual (AUTO.MAN): Alarm will reset automatically once the alarm condition has cleared but can also be reset using the Enter button (or whichever function key is set to acknowledge) at any time.
Latching (LATCH): Alarm must be reset manually and can be done so at any time. Press the Enter (ACK) button at any time to clear the alarm.
Latching with Reset after Cleared (L-CLEAR): Alarm must be reset manually and can only be done so after the alarm condition has cleared. Press the Enter (ACK) button after the alarm condition has cleared to reset the alarm.
All versions of these instruments are CE marked. The hazardous area versions of these instruments are UL and C-UL Listed as intrinsically safe and nonincendive and ATEX and IECEx Certified for Intrinsic Safety in Hazardous Areas (Gas Atmospheres). These versions are also UL and C-UL Listed under the UL 61010-1 General Safety Standard.
One of the most useful aspects of the hazardous area approvals is that these instruments are approved by UL as nonincendive so they can be installed in Division 2 areas with no additional protective devices needed.
Except where noted all specifications apply to operation at +25°C.
Input: 4-20 mA Accuracy: ±0.02% of span ±1 count, Square root and programmable exponent: 10-100% FS Voltage Drop: Without Backlight: 1.5 V maximum, With backlight: 4.7 V maximum Equivalent Resistance: With backlight off: 75 Ω @ 20 mA With backlight on: 225 Ω @ 20 mA Input Overload: Over current protection to 1 A maximum Temperature Drift: 25 PPM/°C from -40 to 75°C ambient Function: PV1: Linear, square root, or programmable exponent PV2: Linear or Round Horizontal Tank Low-Flow Cutoff: 0.0 to 999,999.9 HART Transparency: Analog input will not interfere with existing HART communications on the wired 4-20 mA signal
Display: Dual-line LCD with backlight. Both lines 14-segment alphanumeric. Top: 0.7″ (17.8 mm), Bottom: 0.4″ (10.2 mm). The display may be programmed to turn red and flash a user-defined message on an alarm condition. Backlight: Powered by 4-20 mA loop. Intensity varies with signal level PD6602 & PD6606: Top line: 5 digits (-9999 to 99999) or 5 characters (all capital & most lower case letters) Bottom line: 8 digits (-9,999,999 to 99,999,999; separated by commas) or 8 characters (all capital & most lower case letters) Bargraph: None PD6603 & PD6607: Top line: -99FT 11IN 15/16 to 999FT 11IN 15/16 Bottom line: 8 digits (-9,999,999 to 99,999,999; separated by commas) or 8 characters (all capital & most lower case letters) Bargraph: 20 segments, numeric percent indication at top PD6604 & PD6608: Top line: 5 digits (-9999 to 99999) or 5 characters (all capital & most lower case letters) Bottom line: 8 digits (-9,999,999 to 99,999,999; separated by commas) or 8 characters (all capital & most lower case letters) Bargraph: 20 segments, numeric percent indication at top Decimal Point & Commas: Top line: Up to four decimal places Bottom line: Up to seven decimal places and commas to indicate 1000s (ie 88,987,628) Dual-Scale Feature: The input can be displayed in different scales on the top and bottom lines. For instance, the top line could display the input in height and the bottom line could display that same input in volume. Alarm Indication: Red backlight, flashing display, alarm symbol (!). Symbols are not available on bar graph skus. Alarm Message: On or Off; user-programmable, 8 characters maximum. Displayed every 10 seconds for 1 second on the bottom line. Display Update Rate: Ambient > -10°C: 1 update/second Ambient -20 C: 1 update/2 seconds From -20°C to -40°C the update rate slows down 1 second for every -2°C (e.g. at -24°C, 1 update/4 seconds). Overrange: Top: 99999; Bottom: 99,999,999 (flashing) Underrange: Top: -9999; Bottom: -9,999,999 (flashing)
Environmental: Operating temperature range: -40 to 75°C for safe area products -40 to 70°C for hazardous area products Storage temperature range: -40 to 85°C Relative humidity: 0 to 90% non-condensing. Printed circuit boards are conformally coated. Programming Method: Front panel & Free PC-based USB programming software Enclosure & Materials: Enclosure: 1/8 DIN, IP65, NEMA 4X front panel, high impact plastic, NORYL® polyphenylene ether & polystyrene blend (PPE PS) resin, UL 94V-0, Color: gray, Gasket: silicone rubber, Faceplate: LEXAN® polycarbonate (PC) film, Buttons: silicone rubber Noise Filter: Averages the input signal over a period of time between 1 and 16 seconds to dampen the effects of a noisy signal that causes a jumpy display. 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. Tare: Zeros out display Password: Programmable password restricts modification of programmed settings. Non-Volatile Memory: All programmed settings are stored in nonvolatile memory for a minimum of ten years if power is lost. Normal Mode Rejection: 64 dB at 50/60 Hz Connections: Removable screw terminals accept 12 to 22 AWG wire. DI Digital Input Contacts: 2.1 VDC on contact. Connect normally open contacts across DI+ and DI DI Digital Input Logic Levels: Logic High: 2.4 to 30 VDC (max) Logic Low: 0 to 0.9 VDC Tightening Torque: Screw terminal connectors: 4.5 lb-in (0.5 Nm) Mounting screws: 8.0 lb-in max. (0.9 Nm) Overall Dimensions: 4.68″x 2.45″x 3.79″ (119 mm x 62 mm x 96 mm) (W x H x D) Weight: 8.7 oz (247g) with the option board Warranty: 3 years parts and labor
Common Open Collector & Relay (Alarm) Specifications
High or Low Alarm: User programmable for high or low alarm Alarm Deadband: 0-100% FS, user programmable On & Off Time Delay: 0 to 9,999 seconds Fail-Safe Operation: Independent for each open collector and relay Alarm Operation: Automatic, Automatic with manual override, Latching (manual reset anytime), Latching with reset after cleared (manual reset only after the alarm has cleared) Alarm Indication: Red backlight, flashing display, alarm symbol (!); (symbols not available on bar graph skus) Alarm Message: On or Off; User programmable, 8 characters maximum. Displayed every 10 seconds for 1 second on bottom line Alarm Acknowledge: Front panel ACK button or external digital input resets output and screen indication Auto Initialization: When power is applied to the meter, open collectors and relays will reflect the state of the input to the meter Timer Output: One-shot or Continuous Off Time Delay: 1 sec to 99:59:59 (hrs:min:sec) On Time: 1 sec to 99:59:59 (hrs:min:sec) Stopwatch: Output turns on when started and off when stopped
Open Collector Outputs
Rating: Two NPN, Isolated open collector, 30 VDC @ 150 mA max Output Assignment: Pulse, Alarm, Timer, Stopwatch on/off, or Disable Pulse Output Source: PV (PV1, PV2) or Test Frequency Pulse Output Factor: 0.000001 to 999,999.9 Pulse Width: 0.5 ms @ 1 kHz; 500 ms @ 1 Hz; 50% duty cycle Pulse Output Frequency: 1,000 Hz maximum Quadrature Pulse Output: Available for Output 2 (90° behind Output 1) Alarm Output Source: Assign to PV (PV1, PV2) or Digital Input
Solid State Relays
Rating: Resistive Load: 250 VAC/DC @ 1 A Inductive Load: 75 VA @ 0.6 A, 250 VAC/DC max (Safe Area only) Noise Suppression: Metal oxide varistors across outputs Relay Assignment: Pump Alternation, Alarm, Timer, Stopwatch on/off, or Disable Alarm Output Source: Assign to PV (PV1, PV2) or Digital Input Pump Alternation: Relays will alternate with each pump cycle and alternation can be based on elapsed time. Pump alternation time can be programmed for 0 to 999:59 (hrs:min) Relay (Pump) Runtime: Meter will keep track of how long each relay (pump) has operated and display this information Relay (Pump) Cycles: Meter will keep track of how many times the relays (pumps) have cycled and displayed this information
4-20 mA Transmitter Output
Accuracy: ±0.05% FS ±0.001mA Output Source: PV1, PV2, re-transmit; reverse scaling allowed Scaling Range: 1.00 to 23.0 mA Disable: High impedance state, less than 1 mA Calibration: Factory calibrated 4.00 to 20.00 mA Underrange: 1.0 mA, 3.5 mA, or 3.8 mA (If input < 3.5 mA), or Off; user selectable Overrange: 20.5 mA, 20.8 mA, or 23.0 mA (If input > 20.5 mA), or Off; user selectable Isolation: 500 V input-to-output Temperature Drift: 0.5 μA/°C max from -40 to 75°C ambient External Loop Power Supply: 7.0 VDC to 30.0 VDC maximum Output Loop Resistance: 10-750 Ω @ 24 VDC; 100-1100 Ω @ 30 VDC
Hazardous Area Approvals
ATEX: II 1G, Ex ia IIC T4 Ga, Ta = -40°C to +70°C Certificate number: CML 17ATEX2015X IECEx: Ex ia IIC T4 Ga, Tamb = -40°C to +70°C Certificate number: IECEx CML 17.0008X UL & C-UL Listed as Intrinsically Safe and Nonincendive: Class I, Division 1, Groups A, B, C and D T4, Class I, Division 2, Groups A, B, C, and D T4 Ex ia IIC T4 (Canada); Class I Zone 0, Zone 1 AEx ia IIC T4 (U.S.) Class I Zone 2, Group IIC T4 (U.S.) PROCESS CONTROL EQUIPMENT FOR USE IN HAZARDOUS LOCATIONS UL & C-UL 61010 Listed for Electrical Safety and Type 4X Environmental: Standards for Safety: IEC 61010-1:2010 (3rd Edition); UL 61010-1, 3rd Edition; CAN/CSA-C22.2 No. 61010-1-12, 3rd Edition; Additional Standards: UL 50E
Free Meterview XL PC-Based Programming Software
The main screen displays an image of the connected meter and includes various information about this meter, such as sku number, readings, and status.
Free, PC-based, MeterView XL software that connects to the meter via a micro USB cable is available for programming and setup of the meters. This software greatly simplifies the programming process and also allows the user to save configuration files for later use. The meter will also be powered by the USB connection so no additional power is needed during programming.
Easiest Way to Program Your Loop Leader
Convenient USB Connection
Meter Powered by USB Connection During Programming
Save & Print Configuration Files without Meter Connected
Micro USB Cable Provided
Panel cutout required: 1.772″ x 3.622″ (45mm x 92mm)
Panel thickness: 0.040 – 0.250″ (1.0mm – 6.4mm)
Mounting brackets lock in place for easy mounting
Clearance: Allow 6″ (152 mm) behind the panel
Loop Leaders, when ordered with the two solid state relays, have several features that make them ideal for simple duplex pump control. The relays can be programmed to alternate the pumps based on level and runtime thus ensuring even wear on both pumps. If the level remains constant (within on/off points), alternation is based on runtime. If the level cycles the on/off points, alternation is based on level and runtime. If the run time is set to 0, alternation is based on level. The meter also keeps track of runtime for both pumps and the number of times they have cycled.
In addition to the two solid state relays for controlling pumps, the Loop Leaders two open collectors could be used to indicate high or low level alarm conditions.
The Loop Leader can be used as a pump controller to alternate two pumps and provide high and low level alarm indication. The pumps can be programmed to alternate on level and run time and the meter can display the pump run times and the number of times they have cycled. The PD6606–L2N can be used as an intrinsically safe pump controller.
Signal Input Conditioning
The PD6600 Loop Leader process meter allows you to select the signal input conditioner applied to the input: linear, square root, programmable exponent, or round horizontal tank volume calculation.
The programmable exponent function is used to linearize the level signal in open channel flow applications using weirs and flumes and display flow rate in engineering units.
The square root function can be used to linearize the signal from a differential pressure transmitter and display flow rate in engineering units.
The round horizontal tank linearization function automatically calculates the volume in a round horizontal tank with flat ends.
A digital input comes standard on the Loop Leader PD6600 Series. This allows the user to program an external button to activate certain functions immediately like alarm acknowledgment, display minimum/maximum values, tare the display, reset value, and many more. This allows the Loop Leader to be greatly customized for use in specialized applications. See the PD6600 series manuals for all digital input functions.
Application Timers are used in everyday life; one of the most common examples is the microwave oven. Industrial timers are used in process control applications where certain events or actions need to be controlled by time. Examples include automatic and batch control applications, where the relay needs to be energized for a specific length of time.
The timer fuction is available on the open collector and relay outputs; which means that you can have up to four timers per meter. The start and stop actions can be triggered from the setup menu or by the function keys and digital input. The meter can be setup to display the off/on timer count down.
There are two modes of operation:
Continuous Timer (Interval) At the start of the timer the output is off and turns on after the Off Delay elapses. The output remains on for the duration of the On Time. The cycle repeats until the user stops the timer either from the menu or a function key.
One-Shot Timer At the start of the timer the output is off and turns on after the Off Delay elapses. The output remains on for the duration of the On Time. The timer stops and the cycle does not repeat.
A sensor detects the bottle is in place and triggers the digital input to start the timer
The timer output controls the filling pump
The On Time is set according to the time needed to fill the bottle