Advantage III

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-PE is EBTRON’s most economical solution for larger systems when “out-of-the-box” installed accuracy is not required and field adjustment is acceptable. Perfect for LEED outdoor air delivery monitoring or other low sensor density airflow measurement applications.

  • Thermal Dispersion Technology
  • Supports up to 4 Sensor Nodes
  • NIST‐traceable Calibration
  • %-of-reading Accuracy
  • Airflow and Status Alarm
  • Temperature Output Capability
  • Analog and RS-485 Output Models
  • Three Mounting Styles
  • Remote Transmitter with LCD Display
  • 3‐year Warranty

Typical Applications

  • LEED Outdoor Air Delivery Monitoring
  • Small Duct Airflow Tracking
  • Hospital Pressurization
  • Laboratory Pressurization
  • Air Change Verification & Monitoring
  • System Performance Monitoring


  • Comply with ASHRAE Standards
  • Demonstrate Code Compliance
  • Satisfy LEED Prerequisites and Credits
  • Provide Acceptable IAQ
  • Save Energy
  • Reduce Liability
  • Improve Performance

Product Highlights

  • Accurate and 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 Cables


Probe and Sensor Node Configurations (max.)

1 probe x 4 sensor nodes/probe
2 probes x 2 sensor nodes/probe

Installed Airflow Accuracy¹

≤ 2 sq.ft. [0.185 sq.m.]: [0.18 sq.m]: ±3% of reading
> 2 sq.ft. [0.185 sq.m.]: ±(3% to 10%), typical (increases with increasing duct size). May be improved by field adjustment using the Field Adjust Wizard (FAW) to a reliable reference.

PE Sensor Density

Refer to the PC sensor density table.

Sensor Node Averaging Method

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

Listings and Compliance

UL: UL 873 Listed CSA C22.2 No. 24
CE: 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 id 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 C]
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: ±2% of reading to NIST-traceable airflow standards (includes transmitter uncertainty)
Calibrated Range: 0 to 5,000 fpm [0 to 25.4 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


Material: Gold anodized 6063 aluminum (316 stainless steel with /SS option)

Mounting Brackets

Material: 304 stainless steel

Options & Standard Size Limits2

Insertion: 6 to 191 in. [152.4 to 4851 mm]
Stand-off: 6 to 190 in. [152.4 to 4826 mm]
Internal: 8 to 194 in. [203.2 to 4928 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: 10, 15, 20, 25, 30, 40 and 50 ft. [3.1, 4.6, 6.1, 7.6, 9.1, 12.2 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)
¹Installed airflow accuracy allows for additional uncertainty that results from averaging a finite number of sensors in a contorted velocity profile created from up and downstream disturbances. The specified installed accuracy is based on the PE sensor density rules for installations that meet or exceed EBTRON minimum placement requirements. PE sensor density rules may not be available for all duct sizes due to sensor placement limitations (see PE sensor density tables for more information).

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