Ultra Low
Pressure Transducers
ULP Series



  • Ranges 0.125" W.C. to 1" W.C. (30 to 250 Pa)
  • Three variable jumper selectable
        pressure ranges, W.C. & Pa.
  • Two jumper selectable pressure ranges per model
  • 24 Vac/dc power supply standard
  • Functional weather resistant ABS Enclosure
  • Available options include an LCD display and
        a relay output
    		•


    ULP c/w LCD display

  • HVAC/VAV
  • Process Control
  • Air Flow Monitoring
    		•
  • Static Building Pressure
  • Drop Across Air Filters
  • Room Pressure Monitoring


    • The ULP Ultra Low Pressure Transducer is used to measure differential pressure in the ranges of 0.125"W.C. to 1"W.C. (30 to 250 Pa). It combines precision high sensitivity silicon sensing capabilities and the latest ASIC technology with Dynamic Self Compensation to substantially reduce offset errors due to changes in temperature, stability to warmup, long term instability and position sensitivity. It is ideal for monitoring pressure for air and other clean inert gas and is limited only to those media which will not attack silicon, nylon and epoxy adhesive.

    The ULP features a selectable uni- or bi-directional pressure range and output signal types for the most flexible applications. An optional on-board relay output, which is field adjustable, allows for an alarm function. Additional available options include an LCD and a static pressure probe.



    Pressure Ranges See ordering information
    Calibration Accuracy ± 1% F.S.O.
    Measurement Types Differential (two ports)
    Response Time 0.5 ms
    Thermal Effects < ±3% over compensated range
    Compensated Range 10 – 50° C (50 – 122° F)
    Over Pressure 100" W.C. (24.9 kPa)
    Operating Conditions 0 – 70° C (32 – 158° F), 10 – 90% RH non-condensing
    Media Compatibility Low Port: Dry gases only, media must be compatible with epoxy adhesive
    High Port: Wetted materials compatible with nylon housing, epoxy adhesive and silicon.
    Power Supply
    (at transducer)     		13 – 28 Vac, 18 – 35 Vdc (non-isolated half-wave rectified)
    Supply Current < 30 mA (without relay), or 50 mA (with relay option)
    Input Voltage Effect Negligible over specified operating range
    Protection Circuitry Reverse voltage protected and output limited
    Output Signal 4 – 20 mA (3-wire), 0 – 5 Vdc or 0 – 10 Vdc (3-wire), jumper selectable
    Current Output
    Drive Capability     		550 ohms
    Voltage Output
    Drive Capability     		2 Kohms minimum for 0 – 5 Vdc signal
    10 Kohms minimum for 0 – 10 Vdc signal 
    Zero Adjustment Push button auto-zero
    Optional Relay Output N.O. contact, 5 Amps @ 250 Vac, 5 Amps @ 30 Vdc
    Relay Trip Point Adjustable from ZERO to SPAN via trimport
    Relay Delay 5 seconds on / 5 seconds off
    Wiring Connections Screw terminal block (14 to 22 AWG)
    Pressure Connections Barbed ports for 4.33 mm (0.170”) ID flexible tubing
    Conduit Connection Access hole for 1/2” NPT conduit or cable gland
    Optional LCD 3.5 digit, 10 mm (0.4") digit height
    Enclosure High Impact black ABS, plenum rated with optional gasket
    116 mm W x 84 mm H x 53 mm D (4.55” x 3.3” x 2.1”)


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