BACnet and Modbus available only on HTN104-T.

BACnet is a registered trademark of ASHRAE. ASHRAE does not endorse, approve or test products for compliance with ASHRAE standards. Compliance of listed products to the requirements of ASHRAE Standard 135 is the responsibility of BACnet International. The BTL logo is a registered trademark of BACnet International.

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.

Product Overview






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%


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


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) @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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