What sets the Helios apart from other Large Display Meters is its dual line display with super bright LEDs that can be read even in bright sunlight. The dual line display simplifies programming and also makes it possible to display more information. For instance, the upper line can display the process variable and the lower line a tag or a different scale of the input. In a flow application, one line could display flow rate and the other line flow total. Even if you are not installing the Helios outdoors in bright sunlight, you will appreciate its big, clear, bright display that can be seen from up to distances of 100 feet (30 meters).
Go with the Helios PD2-6262 when you want to display two 4-20 mA flowmeter inputs on one meter. Both of these inputs can be displayed on six full digits and each flowmeter is provided with its own 24 VDC power supply. The PD2-6262 can also perform a variety of math functions on those two inputs, such as computing the difference between them or summing them together. One application for the PD6262 is determining fuel consumption by computing the difference between two flowmeter inputs.
Except where noted all specifications apply to operation at +25°C.
Display: Two lines with 1.8″ (46 mm) high digits, red LEDs; 6 digits per line (-99999 to 999999), with lead zero blanking
Display Intensity Eight user selectable intensity levels
Display Update Rate: 5/second (200 ms)
Overrange: Display flashes 999999
Underrange: Display flashes -99999
Display Assignment: The Upper and Lower displays may be assigned to show:
- One or more rate channels: Channel A (Ch-A), B (Ch-B), or C (Ch-C)
- Toggle between rate channels: Ch-A & Ch-B, Ch-A & Ch-C, Ch-B & Ch-C, and Ch-A, Ch-B, & Ch-C
- Total or grand total: Ch-A or Ch-B
- Rate and total or grand total: Ch-A, Ch-B
- Relay set points
- Max and/or min values: Ch-A, Ch-B, or Ch-C
- Toggle between any rate channel & units
- Total and units: Ch-A or Ch-B
- Toggle between totals: Ch-A & Ch-B; Ch-A, Ch-B, and sum of Ch-A and Ch-B
- Modbus input
The lower display may also be set to show engineering units or be off, with no display.
Programming Methods: Four programming buttons, digital inputs, PC and MeterView Pro software, or Modbus registers.
Noise Filter: Programmable from 2 to 199 (0 will disable filter)
Filter Bypass: Programmable from 0.1 to 99.9% of calibrated span
Recalibration: All ranges are calibrated at the factory. 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: Three programmable passwords restrict modification of programmed settings.
Pass 1: Allows use of function keys and digital inputs
Pass 2: Allows use of function keys, digital inputs and editing set/reset points
Pass 3: Restricts all programming, function keys, and digital inputs.
Power Options: 85-265 VAC 50/60 Hz, 90-265 VDC, 20 W max or 12-24 VDC ± 10%, 15 W max. Powered over USB for configuration only.
Isolated Transmitter Power Supply: Terminals P+ & P-: 24 VDC ± 10%. 12-24 VDC powered models selectable for 24, 10, or 5 VDC supply (internal P+/P- switch). 85-265 VAC models rated @ 200 mA max, 12-24 VDC powered models rated @ 100 mA max, @ 50 mA max for 5 or 10 VDC supply.
Non-Volatile Memory: All programmed settings are stored in non-volatile memory for a minimum of ten years if power is lost.
Fuse: Required external fuse: UL Recognized, 5 A max, slow blow; up to 6 meters may share one 5 A fuse
Normal Mode Rejection: Greater than 60 dB at 50/60 Hz
Isolation: 4 kV input/output-to-power line; 500 V input-to-output or output-to-P+ supply
Overvoltage Category: Installation Overvoltage Category II: Local level with smaller transient overvoltages than Installation Overvoltage Category III.
Environmental: Operating temperature range: -40 to 150°F (-40 to 65°C); Storage temperature range: -40 to 185°F (-40 to 85°C); Relative humidity: 0 to 90% non-condensing
Connections: Removable and integrated screw terminal blocks accept 12 to 22 AWG wire.
Enclosure: UL Type 4X, IP65 rated. Polycarbonate & glass blended plastic case, color: gray. Includes four PG11 through-hole conduit openings, with two factory installed PG11, IP68, black nylon threaded hole plugs with backing nuts.
Wall Mounting: Four (4) mounting holes provided for mounting meter to wall.
Pipe Mounting: Optional pipe mounting kit (PDA6260) allows for pipe mounting. Sold separately.
See PD2-6262 manual for instructions.
Tightening Torque: Removable Screw Terminals: 5 lb-in (0.56 Nm);
Digital I/O and RS485 Terminals: 2.2 lb-in (0.25 Nm)
Overall Dimensions: 10.63″ x 12.59″ x 4.77″ (270 mm x 319.7 mm x 121.2 mm) (H x W x D)
Weight: 6.10 lbs (2.76 kg)
UL File Number: UL & C-UL Listed. E160849; 508 Industrial Control Equipment.
Warranty: 3 years parts & labor
USB Connection: Compatibility: USB 2.0 Standard, Compliant
Connector Type: Micro-B receptacle
Cable: USB A Male to Micro-B Cable
Driver: Windows 98/SE, ME, 2000, Server 2003/2008, XP 32/64-Bit, Vista 32/64-Bit, Windows 7 32/64-Bit, Windows 10 32/64-Bit
Power: USB Port
Dual Process Input
Two Inputs: Two non-isolated inputs, each separately field selectable: 0-20, 4-20 mA, ±10 V (0-5, 1-5, 0-10 V), Modbus PV (Slave)
Channels: Channel A, Channel B, Channel C (Math channel)
|Max of A or B||((AB-Hi)+P)*F|
|Min of A or B||((AB-Lo)+P)*F||Lo-Ab|
|Weighted avg.||((B-A)*F)+A||uw avg|
|Total Addition||(tA+tB+P)*F||Sunm t|
|G. Tot. Addition||(GtA+GtB+P)*F||SunmGT|
|Total Difference||(tA-tB+P)*F||Dif t|
|G. Tot. Difference||(GtA-GtB+P)*F||Dif GT|
|Total Percent||(tA/(tA+tB))*100||T PCT|
Note: The F constant can be any value from 0.001 to 999.999. If the value is less than 1, it will have the same effect as a divider. For example, the average could also be derived by using (A+B)*F, where F = 0.500.
Sequence Of Operations For Input Programming:
- Select Input for A and B
- Set up the rate, total, and grand total engineering units for channels A & B, and units for math channel C
- Set up rate, total, and grand total decimal points for channels A & B, and decimal point for math channel C
- Program channel A & B rate parameters
- Program channel A & B total and reset parameters
- Set up the display line 1 and line 2
- Select the transfer function for A & B (e.g. Linear)
- Select Math function for Channel C
- Program constants for Factor (F) and Adder (P).
- Program cutoff values for A and B
Programmable Constants: Constant P (Adder): -99.999 to 999.999, default: 0.000; Constant F (Factor):0.001 to 999.999, default: 1.000
Accuracy: ±0.03% of calibrated span ±1 count, square root & programmable exponent accuracy range: 10-100% of calibrated span
Temperature Drift: 0.005% of calibrated span/°C max from 0 to 65°C ambient, 0.01% of calibrated span/°C max from -40 to 0°C ambient
Signal Input Conditioning: Linear, square root, programmable exponent, or round horizontal tank volume calculation
Multi-Point Linearization: 2 to 32 points for channel A and B
Programmable Exponent: 1.0001 to 2.9999
Round H Tank: Diameter & Length: 999.999 inch or cm calculates volume in gallons or liters respectively.
Low-Flow Cutoff: 0-999999 (0 disables cutoff function)
Decimal Point: Up to five decimal places or none: d.ddddd, d.dddd, d.ddd, d.dd, d.d, or dddddd
|Input Range||Minimum Span Input 1 & Input 2|
|4-20 mA||0.15 mA|
|±10 V||0.01 V|
An error message will appear if the input 1 and input 2 signals are too close together.
Input Impedance: Voltage ranges: greater than 500 kΩ; Current ranges: 50 – 100 Ω (depending on resettable fuse impedance)
Input Overload: Current input protected by resettable fuse, 30 VDC max. Fuse resets automatically after fault is removed.
HART Transparency: Analog input will not interfere with existing HART communications on the wired 4-20 mA signal
F4 Digital Input Contacts: 3.3 VDC on contact. Connect normally open contacts across F4 to COM.
F4 Digital Input Logic Levels: Logic High: 3 to 5 VDC, Logic Low: 0 to 1.25 VDC
Rate Display Indication: -99999 to 999999, lead zero blanking.
Total Display & Total Overflow: 0 to 999,999; automatic lead zero blanking. Up to 999,999,999 with total-overflow feature. “oF” is displayed to the left of total overflow and ▲ LED is illuminated.
Total Decimal Points: Up to five decimal places or none: d.ddddd, d.dddd, d.ddd, d.dd, d.d, or dddddd
Total decimal point is independent of rate decimal point. Channel A and B decimal points programmed independently.
Dual Totalizer: Calculates total for channels A and B based on rate and field programmable multiplier to display total in engineering units. Time base must be selected according to the time units in which the rate is displayed. Channel A and B totalizer parameters programmed independently.
Totalizer Rollover: Totalizer rolls over when display exceeds 999,999,999. Relay status reflects display.
Total Overflow Override: Program total A or B total reset for automatic with 0.1 second delay and set point 1 for 999,999
Totalizer Alarm Presets:Up to eight, user selectable under setup menu. Any set point can be assigned to channel A or B total or grand total (or C) and may be programmed anywhere in the range of the meter for total alarm indication.
Total & Grand Total Reset: Via front panel button, external contact closure on digital inputs, automatically via user selectable preset value and time delay, or through serial communications. Channel A and B total and grand total reset parameters programmed independently.
Total Reset Password: Total and grand total passwords may be entered to prevent resetting the totals or grand totals from the front panel.
Non-Resettable Total: The grand totals can be programmed as non-resettable totals by entering the password “050873”. Both channels are set to non-resettable when this password is entered.
CAUTION! Once the Grand Totals have been programmed as “non-resettable” the feature cannot be disabled.
On Release 0.1 and 999.9 seconds; applied to the first relay assigned to total or grand total.
If the meter is programmed to reset total to zero automatically when the preset is reached, then a delay will occur before the total is reset.
Rating: 2 or 4 SPDT (Form C) internal and/or 4 SPST (Form A) external; rated 3 A @ 30 VDC and 125/250 VAC resistive load; 1/14 HP (≈ 50 W) @ 125/250 VAC for inductive loads
Noise Suppression: Noise suppression is recommended for each relay contact switching inductive loads. See manual for details.
Deadband: 0-100% of span, user programmable
High Or Low Alarm: User may program any alarm for high or low trip point. Unused alarm LEDs and relays may be disabled (turn off).
Relay Operation: Automatic (non-latching) and/or manual reset; Latching (requires manual acknowledge) with/without clear; Pump alternation control (2 to 4 relays); Sampling (based on time); Off (disable unused relays and enable Interlock feature); Manual on/off control mode
Relay Reset: User selectable via front panel buttons or digital inputs
- Automatic reset only (non-latching), when the input passes the reset point.
- Automatic + manual reset at any time (non-latching)
- Manual reset only, at any time (latching)
- Manual reset only after alarm condition has cleared (latching)
Note: Front panel button or digital input may be assigned to acknowledge relays programmed for manual reset.
Time Delay: 0 to 999.9 seconds, on & off relay time delays; Programmable and independent for each relay
Fail-Safe Operation: Programmable and independent for each relay. Note: Relay coil is energized in non-alarm condition. In case of power failure, relay will go to alarm state.
Auto Initialization: When power is applied to the meter, relays will reflect the state of the input to the meter.
Isolated 4-20 mA Transmitter Output
Output Source: Process variable (PV), max, min, set points 1-4, Modbus input, or manual control mode
Scaling Range: 1.000 to 23.000 mA for any display range
Calibration: Factory calibrated: 4.000 to 20.000 = 4-20 mA output
Analog Out Programming: 23.000 mA maximum for all parameters: Overrange, underrange, max, min, and break
Accuracy: ± 0.1% of span ± 0.004 mA
Temperature Drift: 0.4 µA/°C max from 0 to 65°C ambient, 0.8 µA/°C max from -40 to 0°C ambient
Note: Analog output drift is separate from input drift.
Isolated Transmitter Power Supply: Terminals I+ & R: 24 VDC ± 10%. Isolated from the input at >500 V. May be used to power the 4-20 mA output or other devices. All models rated @ 40 mA max.
External Loop Power Supply: 35 VDC maximum
Output Loop Resistance:
|24 VDC||10 Ω||700 Ω|
|35 VDC (external)||100 Ω||1200 Ω|
RS485 Serial Communications Terminal
Connectors: Removable screw terminal connector
Max Distance: 3,937′ (1,200 m) max
Status Indication: Separate LEDs for Power (P), Transmit (TX), and Receive (RX)
Modbus® RTU Serial Communications Protocol
Slave: ID 1 – 247 (Meter address)
Baud Rate: 300 – 19,200 bps
Transmit Time Delay: Programmable between 0 and 199 ms
Data: 8 bit (1 start bit, 1 or 2 stop bits)
Parity: Even, Odd, or None with 1 or 2 stop bits
Byte-To-Byte Timeout: 0.01 – 2.54 second
Turn Around Delay: Less than 2 ms (fixed)
Note: Refer to the Modbus Register Tables located at www.predig.com for details.
Digital Input & Output Terminal
Channels: 4 digital inputs & 4 digital outputs
Digital Input Logic High: 3 to 5 VDC
Digital Input Logic Low: 0 to 1.25 VDC
Digital Output Logic High: 3.1 to 3.3 VDC
Digital Output Logic Low: 0 to 0.4 VDC
Source Current: 10 mA maximum output current
Sink Current: 1.5 mA minimum input current
+5 V Terminal: To be used as pull-up for digital inputs only. Connect normally open pushbuttons across +5 V & DI 1-4.
WARNING! DO NOT use +5 V terminal to power external devices.
The meter can be mounted to any wall using the four provided mounting holes. Note that the bottom mounting holes are located underneath the front door panel. To mount the meter to a wall, follow these instructions.
- Prepare a section of wall approximately 11″ x 13″ (280 mm x 330 mm) for meter mounting by marking with a pencil the mounting holes (shown in the image to the right) on the wall.
- Using a drill bit slightly smaller than the girth of the mounting screws, pre-drill holes at the mounting locations previously marked.
- Insert mounting screws into the four mounting holes and screw them into the pre-drilled holes. Do not overtighten the mounting screws as it is possible that the enclosure could crack and become damaged.
Meter Mounting Holes
The meter can also be mounted to a pipe using the optional pipe mounting kit (PDA6260). This kit includes two mounting plates, two U-bolts, and the necessary nuts and bolts. To mount the meter to a pipe using the pipe mounting kit accessory, follow these instructions.
- Secure the mounting plates to the top and bottom (for vertical pipes) or left and right (for horizontal pipes) of the reverse side of the meter enclosure using the provided fasteners. Do not overtightenthe fasteners as it could cause damage to the enclosure.
- Using the provided nuts and U-bolts, secure the mounting plates to the pipe enough torque such that the meter cannot be moved up or down (or side to side).
Horizontal Pipe Mount Assembly
Vertical Pipe Mount Assembly
Differential Pressure Flow (PD6262)
The Helios PD2-6262 can display flow rate and total by extracting the square root from the 4-20 mA signal from differential pressure transmitters. The user selectable low-flow cutoff feature gives a reading of zero when the flow rates drop below a user selectable value.
- Display Flow Rate
- User Selectable Low-Flow Cutoff
- Only 2 Calibration Points Required
Open Channel Flow (PD6262)
The Helios PD2-6262, in combination with ultrasonic level transmitters, makes for an easy and convenient way to measure and display open channel flow rates and totals in most weirs and flumes, and take periodic samples. All the user needs to do is enter the exponents for the weirs or flumes into the PD2-6262 and the PD2-6262 automatically raises the input signals to those powers. Sampling can be based on the total flow or the flow rate. Each channel’s signal input conditioning is programmed independently.
Weir Flow Calculated Using Exponential Signal Input Conditioning
Convert Pulse to 4-20 mA (PD6363)
The Helios PD2-6363 accepts pulse outputs from flowmeters and with the appropriate option installed, can convert the pulses to a 4-20 mA signal. The 4-20 mA signal can be programmed to correspond to either the flow rate or the total flow.
- Use K-Factor or Multi-Point Scaling
- ProVu Powers the Flowmeter
- Up to 3 Analog Outputs
The connectors’ label, affixed to the inside of the lower door panel, shows the location of all connectors available with requested configuration.
MeterView® Pro Software
MeterView® Pro software is designed for use with ProVu, ProtEX-MAX, or Helios Series meters and allows users to remotely program, monitor, and datalog using a PC. Remote programming allows for all available meter settings to be programmed through an easy, user-friendly interface. The data acquisition feature allows the user to gather readings from a meter at user-selected intervals and generate charts using common tools like Microsoft® Excel. A linearization setup function is also included. With this utility the user can configure up to 32 linearization points and upload them to the meter. All configuration data can be saved to a file for future use.
This software is accessible via the onboard USB connection on all Helios large display meters, ProVu panel meters, and ProVu-based ProtEX-MAX explosion-proof meters produced since 6 September 2016 (firmware version 4.0 or higher). In order for meters produced prior to 6 September 2016 (firmware version 3.1 or lower) to establish digital communications with a PC, a serial communications adapter is required. For an RS-232 connection, use a PDA1232 adapter.
To determine the software version of a meter:
- Go to the Diagnostics menu () and press Enter button.
- Press Up arrow button and scroll to Information menu (Info).
- Press Enter to access the software number (), version (), and serial number () information. Write down the information as it is displayed. Continue pressing Enter until all the information is displayed.
- The meter returns to Run Mode after displaying all the settings.
Monitor and Datalog