Omega DPF64-SQRT – Analog Input Ratemeter/Totalizer with Square Root Extraction | DPF Series
Engineering Background: The DPF64-SQRT is part of Omega Engineering’s DPF Series of panel-mount process meters, purpose-built for flow measurement applications where differential-pressure transmitters or other analog sensors output a 4–20 mA or 0–10 V signal proportional to the square of flow rate. The onboard square root extraction linearizes the signal, delivering a true flow rate reading in engineering units directly on the front panel display.
Product Positioning: Designed for procurement engineers and system integrators in water treatment, chemical processing, oil & gas, and HVAC industries who require a compact, DIN-rail or panel-mount totalizer with reliable analog input conditioning, resettable batch totals, and relay outputs — without the overhead of a full PLC or SCADA front-end.
Complete Technical Specifications
- Model: DPF64-SQRT
- Manufacturer: Omega Engineering (USA)
- Series: DPF Series Panel-Mount Process Meters
- Function: Analog Input Ratemeter & Totalizer with Square Root Extraction
- Input Signal: 4–20 mA / 0–10 VDC (field selectable)
- Input Impedance: 100 kΩ (voltage)
- Square Root Extraction: Hardware/software linearization for DP-based flow sensors
- Display: 6-digit LED, 14.2 mm character height
- Rate Display Range: 0–999999
- Total Display Range: 0–999999 (resettable)
- Relay Outputs: 2 × SPDT, 5 A @ 250 VAC (setpoint/batch control)
- Analog Output (optional): 4–20 mA retransmission
- Power Supply: 85–265 VAC / 12–36 VDC (universal)
- Panel Cutout: 92 × 45 mm (1/8 DIN)
- Enclosure Rating: NEMA 4X front face (IP65)
- Operating Temperature: 0°C to +50°C
- Storage Temperature: -20°C to +70°C
- Weight: ~560 g
- Certifications: CE, UL Listed
- Country of Origin: USA
Proven Application Environments
- Differential pressure (DP) flow transmitter linearization in water & wastewater plants
- Chemical dosing batch control with resettable totalizer and relay trip
- HVAC chilled water / hot water flow monitoring
- Oil & gas custody transfer metering panels
- Boiler feedwater flow rate display and alarm
- Compressed air / gas consumption monitoring
- Irrigation and agricultural water management systems
Engineering Advantages
- True Square Root Extraction: Eliminates external signal conditioners; directly accepts DP transmitter output and displays linearized flow rate.
- Dual-Function Display: Simultaneous rate and total on a single instrument reduces panel real estate and wiring cost.
- Universal Power Input: 85–265 VAC / 12–36 VDC eliminates power supply selection errors during panel build.
- NEMA 4X Front Face: Washdown-rated for food & beverage and chemical environments.
- Non-Volatile Memory: Totalizer value retained through power loss — critical for billing and batch accountability.
- Field-Configurable Scaling: Engineering unit scaling via front-panel keypad; no laptop or software required.
- Relay Batch Control: Two independent SPDT relays support high/low alarms or sequential batch fill logic.
System Architecture & Signal Flow
The DPF64-SQRT accepts a 4–20 mA signal from a differential pressure transmitter (or equivalent analog flow sensor). The internal microprocessor applies square root extraction to linearize the signal, scales it to user-defined engineering units (e.g., GPM, m³/h, L/min), and simultaneously drives the rate display and accumulates the totalizer register. Relay setpoints are compared against the live rate or accumulated total, triggering SPDT outputs for alarm annunciation or batch valve control. An optional 4–20 mA retransmission output mirrors the linearized rate signal to a PLC, DCS, or data logger without loading the primary sensor loop.
Sourcing & Quality Verification
- All units sourced directly from Omega Engineering authorized distribution channels or verified surplus with full traceability.
- Each unit undergoes incoming inspection: label verification, power-on self-test, display check, and relay continuity test.
- Original factory documentation (datasheet, calibration certificate where applicable) supplied with shipment.
- Konmask.com maintains ISO-aligned procurement records for every SKU — available upon request for vendor qualification audits.
Procurement Process
- Lead Time: In-stock units ship within 1–3 business days; ex-stock orders confirmed same day.
- MOQ: 1 unit (no minimum order quantity).
- Packaging: Original OEM packaging or equivalent anti-static protective packaging.
- Documentation: Commercial invoice, packing list, and datasheet included; COO certificate available on request.
- Payment: T/T, PayPal, credit card accepted; net terms available for qualified accounts.
- Export: DDP/DAP worldwide; HS Code 9026.20 (instruments for measuring/checking flow of liquids).
Technical FAQ
Q: Can the DPF64-SQRT accept a 0–10 V input instead of 4–20 mA?
A: Yes. Input type is field-selectable via internal jumper. Refer to the wiring diagram in the user manual for terminal assignments.
Q: Is the square root extraction always active, or can it be bypassed?
A: The -SQRT suffix denotes the square root extraction firmware variant. For linear analog input without extraction, the DPF64 (without -SQRT) should be specified.
Q: What happens to the totalizer value during a power outage?
A: The totalizer is stored in non-volatile EEPROM and is retained indefinitely through power loss.
Q: Can both relays be used for batch control simultaneously?
A: Yes. Relay 1 can be configured as a pre-batch warning (e.g., 90% of target) and Relay 2 as the batch complete cutoff, enabling two-stage valve control.
Q: Is CE certification documentation available?
A: Yes. CE Declaration of Conformity is available from Omega Engineering and can be provided upon request for EU import compliance.
© 2026 Konmask.com. All rights reserved.
Original Source: https://Konmask.com
Contact: support@konmask.com | +0086 19859288691
