Series 1000
Airflow Measurement with Temperature Capability
C UL US Listed

EB-Flow II

Series 1000
Airflow Measurement with Temperature Capability

The EF-x1000-T (ELF) is EBTRON’s economical measurement solution for round ducts between 4 and 16 inches in diameter. Ideal for most small duct airflow measurement and volumetric airflow tracking applications. Low flow performance, temperature capability and connectivity options make this a better choice than traditional differential pressure averaging arrays, rings and crosses.

  • Thermal Dispersion Technology
  • Cost Effective Single Probe
  • NIST-traceable Calibration
  • %-of-reading Accuracy
  • Velocity Pressure Output Option
  • Temperature Output Models Available
  • Analog and RS-485 Output Models
  • Duct Insertion Mounting
  • Integral Transmitter
  • 3-year Warranty

Typical Applications

  • High Performance CV/VAV Terminal Box Measurement
  • Small Duct Outdoor Air Delivery Monitoring
  • Small Duct Airflow Tracking
  • Hospital Pressurization
  • Laboratory Pressurization


  • Improve Terminal Box Performance with Turndown
  • Comply with ASHRAE Standards
  • Satisfy LEED Prerequisites and Credits
  • Provide Acceptable IAQ
  • Save Energy
  • Reduce Liability
  • Improve Performance

Product Highlights

  • Accurate & Repeatable
  • Low Airflow Capability
  • Long-term Stability
  • Unsurpassed Quality
  • Easy to Install
  • Very Cost Effective High-performance Solution


Probe and Sensor Node Configurations

1 probe x 1 sensor node/probe (4 inch [101.6 mm] probe)
1 probe x 2 sensor nodes/probe (5 to 16 inch [127.0 to 406.4 mm] probes)

Installed Airflow Accuracy¹

±3% of reading

Sensor Node Averaging Method

Airflow: Independent arithmetic average
Temperature: Independent velocity weighted average

Listings and Compliance

UL: 873 and CSA C22.2 No. 24 (EF-A1000-T/ELF-F0x Only)
FCC: This device complies with Part 15 of the FCC rules
RoHS: This device id RoHS2 compliant

Environmental Limits

Probes: 0 to 2,000 fpm [0 to 10.16 m/s]: -20 to 120 ⁰F [-28.9 to 48.9 ⁰C]
Probes: 0 to 3,000 fpm [0 to 15.24 m/s]: 0 to 120 ⁰F [-17.8 to 48.9 ⁰C]
Transmitter: -20 to 120 ⁰F [-28.9 to 48.9 ⁰C] 
Humidity: (non-condensing)
Probes: 0 to 100%
Transmitter: 5 to 95%

Individual Sensing Nodes

Sensing Node Sensors

Self-heated sensor: Precision, hermetically sealed, bead-in-glass thermistor probe
Temperature sensor: Precision, hermetically sealed, bead-in-glass thermistor probe

Sensing Node Housing

Material: Glass-filled Polypropylene (Kynar® with /SS option)
Sensor Potting Materials: Waterproof marine epoxy

Sensing Node Internal Wiring

Type: Kynar® coated copper

Airflow Measurement

Accuracy: ±3% of reading to volumetric airflow standards (includes transmitter uncertainty)
Calibrated Range: 0 to 3,000 fpm [0 to 15.24 m/s]
Calibration Points: 7

Temperature Measurement

Accuracy: ±0.15 ⁰F [0.08 ⁰C] to NIST-traceable temperature standards (includes transmitter uncertainty)
Calibrated Range: -20 to 120 ⁰F [-28.9 to 48.9 ⁰C]
Calibration Points: 3

Sensor Probe Assembly


Material: Mill finish 6063 aluminum (316 stainless steel with /SS option)

Mounting Brackets

Material: 304 stainless steel

Mounting Options & Size Limits

Insertion: 4, 5, 6, 7, 8, 9, 10, 12, 14, & 16 inch round [101.6, 127.0, 152.4, 177.8, 203.2, 228.6, 254.0, 304.8, 355.6 & 406.4 mm]

Integral Transmitter

Power Requirement:

24 VAC (22.8 to 26.4 under load) @5V-A

User Interface:

DIP switch

B.A.S. Connectivity Options

EF-A1000 Transmitter: One field selectable (0-10/2-10 VDC* or 0-5/1-5 VDC* – specify at time of order), scalable and protected analog output signal (AO1=airflow)
EF-A1001 Transmitter: Two field selectable (0-10/2-10 VDC* or 0-5/1-5 VDC* – specify at time of order), scalable and protected analog output signals (AO1=airflow, AO2 = temperature) * The VDC output circuit of the EF-A1000 transmitter can drive the input circuit of devices designed to measure 4-wire current loops with a resistive load ≥250 ohms.
EF-N1000 Transmitter: One field selectable (BACnet MS/TP or Modbus RTU) and non-isolated RS-485 network connection – Individual sensor node airflow rates and temperatures are available via the network (provide individual 24 VAC transformers at each EF-N1000 transmitter for applications requiring isolated RS-485)

System Status Alarm

Type: Sensor diagnostic system trouble indication
Visual Indication: Yes, LED on circuit board
Network Indication: Yes (EF-N1000 only)
¹Installed airflow accuracy is the actual system accuracy expected and includes sampling uncertainty of the sensor probes when installation meets or exceeds placement guidelines.

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