EB-Flow

Series 2000
EF-x2000-B
Bleed Airflow Measurement with Temperature and Alarm Capability
EFX-2000-B
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EB-Flow

Series 2000
EF-x2000-B
Bleed Airflow Measurement with Temperature and Alarm Capability

The EF-x2000-B is a unique measurement device that can detect very small pressure differentials (as low as 0.0002” H₂O) between two adjacent spaces by sensing the airflow rate induced by the pressure gradient. The EF-x2000-B does not measure pressure directly but can be used to determine the approximate pressure differential when the proper flow coefficient for the installation is determined.

  • Thermal Dispersion Technology
  • Bi‐directional Airflow Measurement
  • Detect ΔP as low as 0.0002″ H₂0
  • Airflow (or ΔP) and Status Alarm
  • Temperature Output Capability
  • Analog and RS‐485 Output Models
  • Dry Contact Relay
  • 1/2″ NPT Female Pipe Connections
  • Remote Transmitter with LCD Display
  • 3‐year Warranty
EF-x2000-B Overview PDF 

Typical Applications

  • Ultra-low Differential Pressure Detection
  • Parking Garage Pressurization
  • Construction Zone Contaminant Containment
  • Stairwell Pressurization
  • Relief and Exhaust Damper Control

Benefits

  • Maintain Pressure Relationships between Adjacent Spaces
  • Satisfy LEED Prerequisites and Credits
  • Provide Acceptable IAQ
  • Save Energy
  • Reduce Liability
  • Improve Performance

Product Highlights

  • Uni- or Bi-directional Measurement
  • Extremely Sensitive
  • Airflow or Equivalent Pressure Output
  • Long-term Stability
  • Small Footprint
  • Simple NPT Pipe Connections
  • Optional Mounting Kits Available

General

Probe and Sensor Node Configurations

1 bi-directional, dual 1/2” NPT female bleed sensor housing

Listings

UL: 60730-1; UL 60730-2-9 (HVAC Controls)

Environmental Limits

Temperature:
Sensor: -2,000 to 2,000 fpm [-10.16 to 10.16 m/s] -20 to 160 ⁰F [-28.9 to 71.1 ⁰C]
Sensor: -3,000 to 3,000 fpm [-15.24 to 15.24 m/s] 0 to 160 ⁰F [-17.8 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%

Bleed Sensor Assembly

Sensing Node Sensors

Self-heated sensor: Two precision, hermetically sealed, bead-in-glass thermistor probes
Temperature sensor: One precision, hermetically sealed, bead-in-glass thermistor probe

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: -3,000 to 3,000 fpm [-15.24 to 15.24 m/s]
Calibration Points: 9

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

Probe to Transmitter Cables

Type: FEP jacket, plenum rated CMP/CL2P, UL/cUL listed, -67 to 392 ⁰F [-55 to 200 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] nominal diameter

Transmitter

Power Requirement: 24 VAC (22.8 to 26.4 under load) @8V-A
User Interface: 16-character LCD display and 4 button interface

B.A.S. Connectivity Options

EF-A2000 Transmitter: Two field selectable (0-5/1-5/0-10/2-10 VDC), scalable and protected analog output signals (AO1=airflow or equivalent ∆P, AO2=temperature or alarm)
* The VDC output circuit of the EF-A2000 transmitter can drive the input circuit of devices designed to measure 4-wire current loops with a resistive load ≥250 ohms.
EF-N2000 Transmitter: One field selectable (BACnet MS/TP or Modbus RTU) and non-isolated RS-485 network connection – Individual sensor node airflow rates and temperatures are available via the network (provide individual 24 VAC transformers for each EF-N2000 transmitter for applications requiring isolated RS-485)

Relay

Type: Dry Contact w/ onboard jumper to drive a remote LED (R1=alarm)
Status: N.O. or N.C. via user setup configuration
Rating: 30 VDC or 24 VAC @ 3 amp. max.

Airflow (or Pressure) Alarm

Type: Low and/or high user defined setpoint alarm
Tolerance: User defined setpoint value
Delay: User defined
Reset Method: Manual or automatic
Visual Indication: Yes, LCD display
Network Indication: Yes (EF-N2000 only)
Analog Signal Indication: Yes, on AO2 assignment (EF-A2000 only)
Contact Closure Relay: Yes, on R1 assignment

System Status Alarm

Type: Sensor diagnostic system trouble indication
Visual Indication: Yes, LCD display
Network Indication: Yes (EF-N2000 only)
Analog Signal Indication: Yes, on AO2 assignment (EF-A2000 only)
Contact Closure Relay: Yes, on R1 assignment

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