Advantage IV

Hybrid Series
Airflow Measurement with Temperature & Alarm Capability
C UL US Listed
UKCA_Logo (002) copy

Advantage IV

Hybrid Series
Airflow Measurement with Temperature & Alarm Capability

The HTx104-T is EBTRON’s measurement solution for round ducts between 4 and 16 inches in diameter when a remote display is desired. Ideal for small duct airflow measurement and airflow tracking applications. More output circuit protection than the EF-x2000-T with a true 4-20mA output option (HTA104-T) make this the best choice for all small duct measurement applications.

  • Thermal Dispersion Technology
  • Cost Effective Single Probe
  • NIST-traceable Calibration
  • %‐of‐reading Accuracy
  • Airflow and Status Alarm
  • Temperature Output Capability
  • Analog and RS‐485 Output Models
  • Duct Insertion Mounting
  • Remote Transmitter with LCD Display
  • 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
  • Volumetric or Mass Airflow Measurement
  • Long-term Stability
  • “Plug-and-Play” Operation
  • Intuitive User Interface
  • Waterproof Sensor Assembly
  • FEP Plenum Rated Cable


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: UL-873 and CSA C22.2 No. 24;
CE: Non-UK European shipments only
UKCA::UK shipments only
BACnet International::BTL Listed (HTN104 transmitter)
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 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 160 ⁰F [-28.9 to 71.1 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, and 16 inch round [101.6, 127.0, 152.4, 177.8, 203.2, 228.6, 254.0, 304.8, 355.6 & 406.4 mm]

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: 3, 10, 25 and 50 ft. [0.9, 3.1, 7.6 and 15.2 m]
Connecting Plug: 0.60” [15.24 mm] nominal diameter


Power Requirement:

24 VAC (22.8 to 26.4 under load) @8V-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 when installation meets or exceeds placement guidelines

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