The HTx104-F/SI and HTx104-F/DI are EBTRON’s most economical solutions 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.
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
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
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
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.
