Wireless Instrumentation
Differential Pressure Field Unit

 
The Differential Pressure Field Unit is self powered and contains a differential pressure sensor, signal conditioning circuitry and a RF transceiver operating in the 902 MHz to 928 MHz ISM license-free band. Remote mount sensors and high-gain antennas are available as special options. The field units are completely free of field wiring for power and signal transmission, making them ideal for automation in all types of industrial environments. Data from the sensor is transmitted to the Base Radio for centralized monitoring and data acquisition. The user may specify sample and transmit updates between once per second and once per minute. Transmit rate changes can also be triggered based on events that are defined in terms of measurement limits or rates of movement. This function allows for maximization of battery life while ensuring that all important process events are monitored. A variety of seals are available for applications that require them including sanitary clamp seals for pharmaceutical, food and beverage process areas. 

 
 
Accuracy
  • ± 0.2 % of sensor URL including combined effects of linearity, hysteresis, repeatability and temperature (applies to standard unit without isolating seals) NOTE: addition of seals will reduce accuracy due to thermal effects of fill fluid. Special ranges and accuracy may be available on request.
Static Pressure Effect
  • ± 1.0 % of URL per 1000 PSI typical Return from over pressure
  • ± 0.04 % Sensitivity in Reverse Pressure Direction
  • Within 1.0 % of forward direction Mounting and Positioning Effect
  • ± 1.5 In H2O, correctable with position zero Output Resolution
  • Digital: see specification sheets for the Base Radio and the Analog Output Modules for descriptions of analog and digital output options
Power Characteristics
  • Self-contained power
  • "C" Size 3.6 V lithium battery
  • Up to twenty (20) year battery life (depends on sample rate and RF update rate), field replaceable
Self-Diagnostics
  • Low battery alarm - indicates the need to replace the battery (approximately one month warning) Contains extensive self-checking software and hardware that continuously monitors the operation. Any sensor or device parameter out of spec is identified and reported
Materials of Construction
  • Type 316 stainless steel base and diaphragm Standard 1/2" MNPT (other options available) GE Lexan® cover. V-0 rating and UV stable
Random Vibration Characteristics
  • Certified to withstand 6 g's, 15 minutes per axis from 9 – 500Hz
Industrial Certification
  • Rated for industrial use -40° F to 185° (-40° C to 85° C) FM NEMA 4 or 4X weather-proof enclosure FM rated intrinsically safe for Class I, II, III; Div 1, Groups A, B, C, D, E, F & G; Class I, II, III, Div 2, Groups A, B, C, D, F & G. CSA Type 4 or 4X weather-proof enclosure CSA rated intrinsically safe for Class I, Div 1, Groups A, B, C & D. Class II, Div 1, Groups E, F & G; Class III, Div 1 ATEX II1G, EEx1a IIC T4
 Stability
  • Less than ± 0.25 % of sensor URL per year at ambient temperature
Operating Ambient Environment
  • -40° F to +220° F (-40° C to +104° C) process connection temperature, steady state
  • -40° F to +185° F (-40° C to +85° C) electronics
  • -4° F to +158° F (-20° C to +70° C) display (full visibility)
  • -40° F to +185° F (-40° C to +85° C) display (with reduced visibility)
  • Humidity Limits: 0 to 95 %, non condensing
RF Characteristics
  • 902 MHz - 928 MHz Frequency Hopping Spread Spectrum (FHSS), FCC certified ISM license-free band Up to 3000’ range from Base Radio with clear line of sight; 500' to 1000' typical range with obstructions The RF module in each Field Unit is individually tested and calibrated over the full temperature range to ensure reliable wireless operation
Local Configuration
  • Integrated LCD display with membrane switch buttons Display provides pressure reading and error messages, if applicable Configure sampling and RF parameters locally using membrane switch buttons
Operating Shock and Vibration
  • Certified per IEC EN00068 2-6 (vibration) and 2-27 (shock)
Electromagnetic Compatibility (CE Compliance)
  • Operates within specification in fields from 80 to 1,000 MHz with field strengths to 30 V/m. Meets EN 50082-1 general immunity standard and EN 55011 compatibility emissions standard
Intrinsic Safety Parameters
  • FM Class T4 for max operating temp = +85° C CSA Temp Code T3, operating temp = +85° C CSA Class I, Div 2 Temp Code T4, operating temp = +85°

Pressure Ranges

ModelUpper Range Limit (URL)Max Static Pressure
WI-DP-I-100IN± 100 in H2O2000 PSI
WI-DP-I-300IN± 300 in H2O2000 PSI
WI-DP-I-25PSI± 25 PSI2000 PSI
WI-DP-I-100PSI+ 100, - 25 PSI2000 PSI
WI-DP-I-300PSI+ 300, - 25 PSI2000 PSI

NEWS

Aug. 19th 2011 - Probe Holdings, Inc. has acquired the assets of AKS Technologies, Inc of Houston, USA, in an undisclosed cash and equity transaction.
Click here for the full release.





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