Advantage III

Hybrid Series
HTx104-F (/SI & /DI)
SWSI or DWDI Fan Airflow Measurement with Temperature and Alarm Capability
HTx104-F/SI or DI
C UL US Listed
UKCA_Logo (002) copy

Advantage IV

Hybrid Series
HTx104-F (/SI & /DI)
SWSI or DWDI Fan Airflow Measurement with Temperature and Alarm Capability

The HTx104-F/SI and HTx104-F/DI are EBTRON’s most economical solution for accurate and repeatable airflow measurement in SWSI and DWDI fans. Airflow, temperature and/or airflow alarming are available on all models. Does not affect fan performance.

  • Thermal Dispersion Technology
  • Designed for SWSI and DWDI Fans
  • NIST‐traceable Calibration
  • %‐of‐reading Accuracy
  • Airflow and Status Alarm
  • Temperature Output Capability
  • Analog and RS‐485 Output Models
  • Throat, Face, and Forward Mounting
  • Remote Transmitter with LCD Display
  • 3-year Warranty

Typical Applications

  • Fan Airflow Tracking
  • Air Change Verification & Monitoring
  • Fan Performance Monitoring


  • Demonstrate Fan Performance and Operation
  • Improve Fan Tracking on VAV Systems
  • Comply with ASHRAE Standards
  • Save Energy
  • Reduce Fan Horsepower

Product Highlights

  • Accurate and Repeatable
  • Long-term Stability
  • Streamline Design
  • Adjustable Mounting Brackets
  • “Plug and Play” Operation
  • Intuitive User Interface
  • FEP Plenum Rated Cables


Probe and Sensor Node Configurations

SWSI and DWDI fans: 2 probes x 1 sensor node/per probe in each fan inlet

Installed Airflow Accuracy¹

±(3% to 10%) of reading, depending on fan type and installation. May be improved by field adjustment using the Field Adjust Wizard (FAW) to a reliable reference.

Sensor Node Averaging Method

Airflow: Independent, arithmetic average
Temperature: Independent, velocity weighted average

Listings and Compliance

UL: UL-873 and CSA C22.2 No. 24
CE: European shipments only (EB-Link not available)
UKCA: UK shipments only
BACnet International: BTL Listed (HTN104 transmitters)
FCC:This device complies with Part 15 of the FCC rules
RoHS:This device is RoHS2 compliant

Environmental Limits

Probes: -20 to 160 ⁰F [-28.9 to 71.1 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
Temperature sensor: Precision, hermetically sealed, bead-in-glass thermistor

Sensing Node Housing

Material: Glass-filled Polypropylene
Sensor Potting Materials: Waterproof marine epoxy

Airflow Measurement

Accuracy: +2% of reading to NIST-traceable airflow standards (includes transmitter uncertainty)
Calibrated Range: 0 to 10,000 fpm [0 to 50.8 m/s]
Calibration Points: 16

Temperature Measurement

Accuracy: ±0.15 ⁰F [0.08 ⁰C] to NIST-traceable temperature standards (includes transmitter uncertainty)
Calibrated Range: -20 to 160 ⁰F [-28.9 to 71.1 ⁰C]
Calibration Points: 3

Sensor Probe Assembly

Mounting Rods

Material: Zinc plated steel

Mounting Brackets

Material: 304 stainless steel

Mounting Options & Size Limits

Throat: 6 to 66 inches [152.4 to 1676.4mm] (throat diameter)
Forward: 6 to 64 inches [152.4 to 1625.6 mm] (diameter at inlet entrance)
Face: 11 to 77 inches [279.4 to 1955.8] (diameter at inlet entrance)

Probe to Transmitter Cables

Type: FEP jacket, plenum rated CMP/CL2P, UL/cUL listed, -67 to 302 ⁰F [-55 to 150 ⁰C], UV tolerant
Standard Lengths: 10, 25, and 50 ft. [3.1, 7.6 and 15.2 m]
Connecting Plug: 0.60” [15.24 mm] circular DIN


Power Requirement:

24 VAC (22.8 to 26.4 under load) @11V-A

PCB Connections:

Gold-plated PCB interconnects and test points

User Interface:

16-character LCD display and 4 button interface

B.A.S. Connectivity Options

HTA104 Transmitter: Two field selectable (0-5/0-10 VDC or 4-20mA), scalable and isolated analog output signals (AO1=airflow, AO2=temperature or alarm)
HTN104 Transmitter: One field selectable (BACnet MS/TP or Modbus RTU) and isolated RS-485 network connection- Individual sensor node airflow rates and temperatures are available via the network

Airflow Alarm

Type: Low and/or high user defined setpoint alarm
Tolerance: User defined % of setpoint
Delay: User defined
Zero Disable: Alarm can be disabled when the airflow rate falls below the low limit cutoff value (unoccupied periods)
Reset Method: Manual or automatic
Visual Indication: Yes, LCD display
Network Indication: Yes (HTN104 only)
Analog Signal Indication: Yes, on AO2 assignment (HTA104 only)

System Status Alarm

Type: Sensor diagnostic system trouble indication
Visual Indication: Yes, LCD display
Network Indication: Yes (HTN104 only)
Analog Signal Indication: Yes, on AO2 assignment (HTA104 only)
¹ Installed airflow accuracy is the actual system accuracy expected and includes sampling uncertainty of the sensor probes.

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