AMETEK Process Instruments

- Model 303B - Moisture Analyzer

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The 303B offers highly accurate portable measurement of trace moisture in gas streams for division 2 areas. Using an electrolytic (P2O5) sensor, the 303B can be used to monitor nearly all gases. It is compact, lightweight, and suitable for both portable use and permanent installation in Class I Div. 2 areas. With the optional carrying bag and lightweight design, the 303B is truly portable.

Every 303B is equipped with the following:

  • digital display
  • rugged moisture cell
  • bypass flowmeter
  • 4 to 20 mA output
  • internal battery and recharging system
  • AC and 12VDC power inputs

The 303B is designed to measure moisture content in gases such as air, nitrogen, argon, natural gas, and others with comparable characteristics. Typical applications are:

  • Monitoring natural gas pipelines and gas treatment processes  
  • Monitoring air humidity in dry boxes  
  • Continuous monitoring of atmospheres in simulated space chambers  
  • Sensing elements in humidity control systems  
  • Monitoring inert protective atmospheres in brazing or sintering furnaces  
  • Monitoring moisture in many fluorocarbon gases  
  • Constant measurement of batch and continuous driers to assure quality control without the expense of overdrying  
  • Monitoring anhydrous batch chemical processes at startup  
  • Quality control of transistor and diode backfill gas  
  • Instrument air systems  
  • Cryogenic processes  
  • Radar waveguides

  • Dynamic Range:  0 to 1000 ppmv at 100 mL/min sample flow through cell at 25ºC and 101.4 kPa (0-2000 ppmv range possible with reduced sample flow
  • Sensitivity:  0.1 ppmv
  • Accuracy:  +0.5 ppm or +5.0% of the display reading, whichever is greater
  • Response Time:  63% response to a stepwise change in either direction between 50 ppm and 1000 ppm will occur in 30 seconds or less
  • Utility Requirements:  100 to 130 VAC or 200 to 260 VAC and optional 12 to 14 VDC operation, 20W maximum
  • Analog Output:  4-to-20 mA DC proportional to range selected, compatible with 625-ohm maximum load
  • Alarms:  Rated for 1 A, 24 VDC, normally open and normally closed contacts; user-settable to fail-safe or low-power operation
  • Sample Temperatures:  up to 52ºC (125ºF)
  • Ambient Temperature:  0º to 52ºC (32º to 125ºF)
  • Temperature Stability:  0.5% per ºC of selected range
  • Sample Pressure:  69 to 690 kPa (10 to 100 psi) gauge

Mechanical Specifications

  • Electrolyte Cell:  The electrolyte sensor is in a self contained assembly for quick and easy replacement
  • Front Panel Controls:
    • Analog ranges 0 to 10, 100, 1000, and 2000 ppm; 0 to 0.5, 5, 50, 100 lb/mmscf
    • Display light
    • Alarm
    • Standby power
    • Electrical test
    • Cell test
    • Power
    • Sample and by-pass flow adjust
  • External Connectors:  Gas IN and OUT fittings for 1/8 inch OD tubing. Internal connections for output and alarms; relay jumper changes operation to failsafe mode
  • Materials of Construction:  Sample comes in contact with P2O5 stainless steel, TEFLON® fluorocarbon resin, gless, platinum, and Viton
  • Weight:  6.4kg (14 lb)
  • Cabinet Dimensions (LxWxH):  34.3 x 23.5 x 12.7 cm (13.5 x 9.25 x 5.0 in)

  • UL/CSA General Safety Requirements
  • UL/CSA Class I, Division 2, Groups A, B, C, D T4A
  • Complies with all relevant European directives

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