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.
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
Temperature:
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%
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
Tube
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]
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)
