DOR Insertion Paddle Wheel Flowmeter


  • Flow Range: 5.5 … 180 GPM to 25,000 … 800,000 GPM
  • Flow Velocity Range: 1.0...33.0 ft/s
  • pmax: 1160 PSI
  • tmax: 300 °F
  • Connection: 1½" NPT, 2" NPT Male, R 1½, & R 2 Male for Pipe Sizes: 1½"...100"
  • Linearity: ± 1.5% with Well Established Flow Profile
  • Body Material: Stainless Steel
  • Outputs: Pulse, LCD Display, Batching, Totalizing, 4 - 20mA, Switches


The DOR series insertion paddle wheel flow sensor offers cost effective measurement of the flow of water or water-like liquids in large pipes. The sensor is inserted into the process piping via a suitable tee, thread-o-let or half coupling. Flow through the pipe results in rotation of the paddle wheel which is proportional to the fl ow velocity and to the fl owrate in the pipe. The DOR is much less expensive than full bore flowmeters, especially in larger pipe sizes. Insertion paddle wheel sensors are rugged and boast exceptional tolerance to dirt and solids.

The DOR features an all 316 L stainless steel body. The rotor is made of PVDF or PEEK, with a long-life graphite/PTFE self-lubricating bearing. It has an integral, precision insertion mechanism that allows insertion of the rotor to a precise depth in the pipe for optimal readings. Available signal outputs include NPN open collector frequency, and/or reed contact frequency or millivolt frequency. Optional indicators include battery powered totalizers and loop powered rate meter/totalizers with outputs and batch controllers. The DOR-5 may be installed through a 2" ball valve to allow serviceability with minimal process interruption. With its symmetrical design, the DOR may also be used for bi-directional flow measurement when fitted with the quadrature output option in conjunction with an appropriate discriminator circuit or display.


  • HVAC: Hot and Cold Water, Fire Systems, and Thermal Energy Monitoring
  • Municipal: Water Distribution, Water Management and Water Treatment
  • Irrigation: Water Management
  • Water Treatment: Chlorination, Desalination and Mechanical Filtration Plants, Chemical Injection Systems
  • Refineries: Fire and Cooling Systems
  • Power Generation: Boiler Feed Water, Steam Condensate, Process Water and Water Balancing
  • Chemical: Process & Cooling Tower Water, Chemical and Water Batching
  • Others: Cement Manufacturing, Flow Testing, Fire Truck and Hydrant Flow Monitoring, Food Processing, Pulp/Paper, Mining, and Fountains


Technical Details
Velocity Range (Linear): 1.0 ... 33 ft/s
Linearity: ±1.5% w/Well Established Flow Profile
Repeatability: ±1% of f. s. at Factory Conditions and Optimal Straight Runs
Max Pressure: 1160 PSI
Temperature Range: 5 … 212 °F Standard, See Max. Allowable Media Temperature Table for Other Options and Restrictions

Body: 316L Stainless Steel
Rotor: PVDF or PEEK (Depending on
Rotor Shaft: 316L Stainless Steel
Bearing: Graphite/PTFE
Seals: FKM (Standard): 5 … 300 °F EPR (Ethylene Propylene Rubber): -40 … 260 °F NBR (Nitrile): -40 … 260 °F

Max. Frequency: 220 ... 240 Hz (Hall Effect and Voltage Output) 73 ... 80 Hz (Reed Switch Output)
Supply Voltage: See Electronics Comparison Table
Electronic Features: See Electronics Comparison Table
Wiring (Standard): 10 Ft., 5 wire Shielded Cable
Transmission Distance: 3000 ft Maximum, without Integrated Electronics
Cable Entry (Terminal Box): Standard: M20x1.5 Optional: 1/2" NPT via Adapter
Ingress Protection: IP 66/67 IP 68 w/Cable Connection
Straight Piping Requirement: Minimum: 10xd (Upstream), 5xd(Downstream) Optimal: 25xd (Upstream), 10xd (Downstream)
Weight (Approx.): 3.6 lb (DOR-4), 5.5 lb (DOR-5) without Electronics

Electrical Output Specifications

Hall Effect Sensor Output (Fx, Nx, Qx)
The Hall Effect Sensor is a high resolution, solid state 3 wire device providing an unsourced, open collector, NPN transistor output. The term "unsourced" means that no voltage is applied to the output from within the flowmeter. It must be pulled to a 'high' or 'on' state by 5 - 24VDC supplied from an external source, typically the receiving instrument. The pulse output between signal and -0V is a voltage square wave with the high level being the DC voltage available at the open collector and the low level being -0V. The receiving instrument must incorporate a pull up resistor (typically greater than 10 kΩ) which ties the open collector to the available DC voltage level when the Hall sensor is not energized. When energized, the open collector output is pulled to ground through the emitter (-0V). The power supply requirement is: 5 - 24 VDC, 20 mA max.

Voltage Pulse Output (Fx)
A self generating 2 wire voltage pulse output with 1.5V voltage spike of approximately 10 microseconds duration is generated with no dependence on rotor speed.

Reed Switch Pulse Output (Rx)
The reed switch output is a two wire normally open SPST voltage free contact ideal for installations without power or for use in hazardous area locations (simple apparatus) when Intrinsically Safe (I.S.) philosophy is adopted. When using the reed switch output, the liquid temperature must not change at a rate greater than 18 ºF per minute. In general, the reed switch life will exceed 2 billion actuations when switching less than 5VDC at 10mA. The voltage/current limits are: 30 VDC max, 200 mA max.

Quadrature Pulse Output (Qx)
Two Hall-Effect sensors are arranged to give separate outputs out of phase with one another. The Quadrature output is commonly used to provide verification of output signal integrity or to measure bi-directional flow in conjunction with an appropriate discriminator circuit or display. The power supply requirement is: 8 - 24 VDC, 20 mA max.

NPN Inductive Pick-up (Ex)
Inductive pick-up with non-magnetic rotor for applications with high ferrous content liquids. The signal output is 3-wire, NPN transistor. The power supply requirement is: 5 - 24 VDC, 20 mA max.

DOR Insertion Paddle Wheel Flowmeter
DOR Insertion Paddle Wheel Flowmeter


DOR Insertion Paddle Wheel Flowmeter
DOR Insertion Paddle Wheel Flowmeter
DOR Insertion Paddle Wheel Flowmeter


DOR Insertion Paddle Wheel Flowmeter