SpanPac H2O Specifications

Principle of Operation

  • Delivery of precise, adjustable concentrations by dilution of moisture vapor from one or more certified water permeation tubes held at constant temperature

Models Available 

  • Span Pac 61-H20 with single oven and primary dilution
  • Span Pac 261-H20 with dual ovens and primary dilution
  • Span Pac 61-H20-SD with single oven and primary and secondary dilution  
  • Span Pac 61-W-H20 single-oven welded model for concentrations below 100 ppb (0.01 ppm)
  • Span Pac 61-W-H20-SD single-oven welded model with secondary dilution for concentrations below 100 ppb (0.01 ppm)

Permeation Tube Oven 

  • High thermal mass oven with electronic PID control in Vertical orientation
  • Oven temperature range (heat only):  30-150 °C
  • NIST-traceable oven temperature  
  • Oven setpoint resolution and control:  ±0.1 °C

Diluent Gas (customer-supplied)

  • Uses inert, non-reactive, non-hazardous dry gas (nitrogen, zero air, argon, etc.) 
  • Mass flow subsystem(s) are factory-calibrated for nitrogen diluent gas. Contact us for calibration in other diluent gases
  • (option) Instrument can be customized for other diluent gases such as hydrogen or oxygen: contact us 

Primary Dilution Flow Subsystem  

  • Primary dilution flow rate range:    0.25 to 5 l/min
  • Mass flow rate accuracy   ±1% FS
  • Mass flow rate indicated on front panel  
  • Mass flow meter subsystem is factory-calibrated in nitrogen; contact us for calibration in other gases
  • (option) 0.5 to 10 lpm; other flow ranges available: contact us

Secondary Dilution Flow Subsystem  

  • Secondary dilution flow rate range:     0.25 to 5 l/min
  • Secondary component split flow mass flow range:  10 to 200 sccm
  • Mass flow rate accuracy (dilution and component flow controllers):  ±1% FS
  • Mass flow rate indicated on front panel
  • Overall output gas stream dilution ratio with both primary and secondary dilution:  10,000:1
  • (option) 5 to 100 sccm mass flow range: contact us

Accepts Vapor Emissions from the Following Devices (A single oven can hold only one of the above tube types at a time)

  • Disposable 0.25 in (0.635 cm) water permeation tube(s) up to 5 in (12.7 cm) in overall length (maximum of 6 disposable tubes)  
  • User-refillable liquid filled high rate (LFH) water permeation tube (max. 1 tube)

Component Flow Path

  • Electro-polished and passivated stainless steel tubing to minimize adsorption
  • Electro-polished stainless steel permeation tube holder (for disposable-type tubes)  
  • Heated lines 

Cabinet Purge Port

  • Reduces outboard-to-inboard atmospheric moisture contamination  
  • Maintains an acceptable nitrogen level within the cabinet when using hydrogen as the diluent gas to eliminate any possibility of an explosive mixture. (The user must supply a continuous controlled flow of nitrogen to the purge port.) 

Optional Welded Models

  • Seamless tubing with orbitally-welded joints for Span Pac 61-W-H20 and Span Pac 61-W-H20-SD models that generate 1 or more concentrations below 100 ppb

Modes of Operation

  • Standby, zero and span modes set from the front panel

Output Concentration Range

  • Single oven model: 20 to1 concentration range within 0.01 to 10,000 ppm
  • Dual oven model: 400 to 1 concentration range within 0.01 to 10,000 ppm
  • Single oven model with secondary dilution: 10,000 to 1 concentration range within bounds of 0.01 to 10,000 ppm
  • (option) Welded models for concentrations below 100 ppb (0.01 ppm)
  • (standard) Output gas stream can be pressurized from ambient to 377 kPa (40 psig) for single and dual oven models and 343 kPa (35 psig) for secondary dilution model
  • (option) Other output pressure ranges available: contact us

Housing Configuration

  • (standard) Desktop enclosure  
  • (option) NEMA 4 enclosure for industrial environments
  • (option) NEMA 4 enclosure with Z-purge to meet NEC Class 1, Group C or D, Division II    
  • (option) NEMA 4 enclosure with X-purge to adapt unit to Division I requirement

Power Requirements (specified when ordering)

  • 115 VAC, 50/60 Hz  
  • 230 VAC, 50, 60 or 50/60 Hz

Typical custom Applications (Please contact us)

  • Using trace moisture with reactive gases  
  • Using other dilution gases such as oxygen, hydrogen, CO2, etc.  
  • Pressurized output gas stream greater than standard pressures  
  • Other mass flow rate ranges  
  • Your special requirements - contact us