Model 491M Gas Standards Generator

The 491M is ideally suited for creating trace concentration - ppm, ppb, and pptr - mixtures. The 491M uses KIN-TEK Trace Source™ disposable, refillable and diffusion permeation tubes for over 500 chemicals.

The 491M is composed of one or more of the following manually-operated modules, depending on application requirements:

• 491MB Base Module (shown above): The "Base" module is required in every 491M instrument. This module provides manual front panel (a) oven temperature setpoint and primary dilution flow rate adjustment controls, (b) standby, zero and span selection, and (c) permeation tube oven temperature and primary dilution mass flow rate indication. [brochure]
  
  
• 491M-PM Auxiliary Permeation Oven Module (PM): Additional permeation tube ovens allow generation of a multi-component gas stream for cases in which (a) the tubes must be maintained at different temperatures, (b) differing permeation technologies (disposable tubes vs. refillable tubes) are required, (c) more components are needed than can be held in a single oven, or (d) for applications in which various components will be switched in and out of the gas stream. Up to 5 PM oven modules can be added wherein each oven can hold up to eight disposable permeation tubes or one factory-refillable tube. Any combination of ovens can be kept on standby to keep various tubes at temperature while not adding their emission to the output gas stream. [brochure]
  
  
• 491M-SD Secondary Dilution Module (SD): The SD Module extends the range of concentration attained from permeation tubes by providing an additional stage of dilution of the gas stream. Very low concentrations - ppb or ppt - can be generated depending on the emission rate of the tubes and the flow rate range of the primary and secondary dilution flow controllers. Overall dilution ratios of 10,000:1 can be achieved. [brochure]
  
  
• 491M-GF Gas Feed Module (GF): Most applications can use liquid-filled permeation tubes. However, some compounds (e.g., NO, CO, O2, etc.) have very high vapor pressures and require a special mechanism to achieve desired concentration levels. The Gas Feed Module adapts an adjacent 491MB Base oven module or auxiliary 491-PM oven module and allows the customer to refill a "customer-refillable" gas-fed permeation tube. These are special tubes, typically made of stainless steel. Prior to shipment, KIN-TEK determines the tube membrane's certified emission rate for one or more components. In use, the customer typically supplies component gas from a cylinder to initially fill the tube and to periodically recharge it. [brochure]
  
  
• 491M-DGB Direct Gas Blending Module (DGB): The DGB Module allows input of higher concentration component gas from a cylinder into the gas stream.The 491M gas standards generator then dilutes the mixture to produce a desired concentration. Dilutions from 1.5:1 to 200:1 are possible. [brochure]
  
  
• 491M-HG Humidified Gas Module (HG): The Humidification Module allows addition of humidity to the gas stream. Up to 95% relative humidity can be added, depending on the overall dilution flow rate required to achieve the target concentration at the target relative humidity. [brochure]
  
  
• 491M-IM Interface Module (IM): The Interface Module contains gas stream interfacing components needed to assure constant gas stream output conditions independent of variations in flow and pressure. The Interface Module is ideal for applications where flow capacity of end use is limited (e.g., filling of gas bags), or when back pressure is required to introduce the output gas stream sample to the device under test. Controls are provided on the front panel for adjusting the output pressure. [brochure]
  
  
• 491M Modular Gas Standards Generator (shown below): The 491MB Base module and any additional modules can be packaged in stand-alone carrying cases or packaged in one or two 3-module expansion cases as shown below (unused module slots in the expansion case are filled with blank panels). [brochure]
  

491M Modular Gas Standards Generator

The example 491M instrument above contains a 491MB Base Module, 491M-PM Auxiliary Permeation Oven Module and 491M-IM Interface Module.

491M features:

• Industry standard for over 20 years
• Complete, integrated, ready-to-use turnkey system
• Manually operated via front panel controls
• Direct readout of oven temperature and mass flow rate
• Modes of Operation: standby, zero and span
• Designed for expandability
  
• Flow path designed for maximum flexibility with minimum error
• Flow path suitable for reactive gases - mixture contacts only glass, Teflon® and stainless steel (other materials available)
• Optional component flow path materials available (sulfinert-coated, all stainless, etc.)
  
• Accepts disposable permeation tubes, diffusion tubes, ultra-high rate liquid filled tubes, wafer tubes, and prefilled gas fed permeation tubes
• Accepts up to 8 disposable tubes per oven with maximum 6 inch length x 1/4 inch diameter (KIN-TEK HRT, SRT and EL tubes)
• Accepts one of KIN-TEK refillable LFH, ULED and 57 Series tubes per oven

Please scroll up and click the "Specifications" tab above to see more features and specifications of the 491M.

Principle of Operation	491MB Base Module
Dilution of constant component vapor emission from permeation or      diffusion tubes
Delivery of precise, adjustable, low concentration dynamically blended      gas mixtures. Trace concentrations - ppmv, ppbv, pptv
Manual front panel controls for oven temperature and dilution flow rate      adjustment and standby, zero and span selection
Permeation Tube Oven
Construction - high thermal mass oven with electronic PID control	Vertical orientation
Oven temperature range (heat only)	30-150 °C
NIST-traceable oven temperature
Oven setpoint resolution and control	±0.1 °C
Temperature digital indication and adjust via front panel
Diluent Gas (customer-supplied)
Uses inert, non-reactive, non-hazardous dry gas (Nitrogen, zero air,      Argon, etc.)
Mass flow meter subsystem is factory-calibrated in Nitrogen; contact factory      for calibration in other type gas
Primary Dilution Mass Flow Controller
Dilution flow rate set by manual valve on front panel; measured by mass flow meter
Standard dilution flow rate range	0.25 to 5 lpm
Optional flow rate ranges available (0.5-10, 0.1-1, 0.1-0.5 lpm)
Mass flow rate accuracy	±1% FS
Mass flow rate indication via front panel
Mass flow calibration method	Analog zero/span adjust
Accepts Vapor Emissions from the Following Devices*
Liquid-filled disposable tubes up to 15 cm in length (maximum of 8 tubes)
Liquid-filled high rate (LFH) permeation tubes (maximum of 1 tube)
Factory pre-filled gas-fed permeation tubes (maximum of 1 tube)
Diffusion tubes (maximum of 4 tubes)
*Note: A single oven can hold only one of the above tube types at a time
Standard Component Flow Path
Component contacts only glass, Teflon® and stainless steel
Glass permeation tube holder
Suitable for reactive component gases
Optional Component Flow Path (specified at time of order)
Heated output lines
Stainless steel
Electro-polished stainless steel
Sulfinert-coated stainless steel
Teflon only
Teflon permeation tube holder
Standard Modes of Operation
Standby (oven venting at approx 75 cc/min flow rate)
Zero (with user-specified flow rate)
Span-by-flow; flow rate set by manual valve on front panel and measured      by mass flow meter with front panel digital indication
Output Concentration Range
Below 1 ppb to over 1000 ppm depending on tube emission rate      and dilution flow rate; low ppb and ppt concentrations with secondary dilution
Expandability
Additional permeation ovens (via up to five 491M-PM modules)
Customer-refillable gas-fed permeation oven option (via 491M-GF modules)
Secondary diluition flow rate option (via 491M-SD module); other ranges available	0.5 to 5 lpm
Overall output gas stream dilution ratio with both primary and secondary dilution	Up to 10,000 to 1
Direct gas blending module option (via 491M-DGB)
Humidified gas module option (via 491M-HG)
Gas stream output Interface Module option (via 491M-IM module);      If 491M-SD secondary dilution module is installed, subtract 10 psig (69 kPa)	ambient to 40 psig (276 kPa)
Instrument Housing (specified when ordering)
Carrying case (standard)
Expansion chassis (option); desktop or rack-mount; 2 cases maximum	3 modules per case
Maximum number of modules in a single 491M system	6
Power Requirements (specified when ordering)
115 VAC, 50/60 Hz
230 VAC, 50/60 Hz
Dimensions and Weight
Dimensions (Base module as packaged in carrying case); approximate	7.5 W x 13.5 H x 20 D inch 18.4 W x 34.3 H x 50.8 D cm
Weight (Base module as packaged in carrying case); approximate	32 lb (14.5 kg)
Certifications
European CE Mark (230 VAC, 50 Hz): 491MB (Base), 491M-PM, 491M-SD,      491M-HG, 491M-GF, 491M-DGB
UL (site-specific)
Speciality Applications (Please contact the Factory)
Special diluent (carrier) gases other than inert gases
Trace moisture
Chemical compatibility issues
Heat tracing requirements
Other

Principle of Operation	491MB Base Module	FlexStream Base Module
Dilution of constant component vapor emission from      permeation or diffusion tubes
Delivery of precise, adjustable, low concentration      dynamically blended gas mixtures. Trace concentrations -      ppmv, ppbv, pptv
Oven temperature and dilution flow rate adjustment and      standby, zero, and span selection	Manual controls	Touchscreen
External PC monitoring and control via industry-standard      Modbus® RTU communications protocol and Ethernet or serial      RS-232 connectivity
Permeation Tube Oven
Construction - high thermal mass oven with electronic PID control	Vertical orientation	Vertical orientation
Oven temperature range (heat only)	30-150 °C	30-150 °C
NIST-traceable oven temperature
Oven setpoint resolution and control	±0.1 °C	±0.01 °C
Temperature digital indication and adjust via front panel
Over-temperature detection with audible alarm and oven      power removal
Temperature digital indication and adjust via computer       interface
Diluent Gas (customer-supplied)
Carrier flow rate across oven	manually-set	fixed
Uses inert, non-reactive, non-hazardous dry gas      (Nitrogen, zero air, Argon, etc.)
Mass flow subsystem is factory-calibrated in Nitrogen;      contact factory for calibration in other type of gas
Accepts a gas correction factor (GCF) for most gases to      auto-adjust the dilution mass flow rate when a diluent gas      other than Nitrogen is used
Using the supplied FlexLink™ PC-based software (FlexStream      only), the mass flow controller subsystem can be easily calibrated      with up to 10 points in other diluent gases (Customer supplies the      flow standard)
Primary Dilution Flow Rate
Dilution flow rate type	Mass flow meter	Mass flow meter and controller
Standard dilution flow rate range	0.25 to 5 lpm	0.25 to 5 lpm
Optional flow rate ranges available	10, 1, 0.5 lpm	10, 1, 0.5 lpm
Flow rate accuracy	±1% FS	Lesser of ±1.5% Reading and ±1% FS
Flow rate calibration method	Analog zero/span adjust	Piece-wise linear fit of up to 10 calibration points
Flow rate indication via front panel
Flow rate control via front panel	Flow rate set by manual valve from front panel	Flow rate set from touch screen target flow or target concentration
Flow rate digital indication and control via computer      interface
Flow rate can be auto-set based on target concentration
Accepts Vapor Emissions from the Following Devices*
Liquid-filled disposable tubes up to 15 cm in length      (maximum of 8 tubes)
Liquid-filled high rate (LFH) permeation tubes (maximum      of 1 tube)
Factory pre-filled gas-fed permeation tubes (maximum      of 1 tube)
Diffusion tubes (maximum of 4 tubes)
*Note: A single oven can hold only one of the above tube types at a time
Standard Component Flow Path
Component contacts only glass, Teflon® and stainless      steel
Glass permeation tube holder
Suitable for reactive component gases
Optional Component Flow Path
Heated output lines
Stainless steel
Electro-polished stainless steel
Sulfinert-coated stainless steel
Teflon only
Teflon permeation tube holder
Standard Modes of Operation
Standby
Zero
Span-by-flow	Manual valve set and digital indication	Touchscreen flow setpoint and digital indication
Span-by-concentration (user-specified target concentration)
Auto-calculates flow setpoint based on target      concentration, tube emission rate and oven temperature	Manual Calculation
Automatically updates touchscreen with up to eight      generated concentration values
Output Concentration Range
Below 1 ppb to over 1000 ppm depending on tube      emission rate and dilution flow rate; low ppb and ppt      with secondary dilution
User selects units of ppm, ppb or ppt
Interfaces
Local human interface - color touch screen with virtual      keypad
Remote computer interfaces (standard Ethernet & RS-232)
Communications Protocol		Modbus RTU
PC-based Software
KIN-TEK FlexLink™ software CD shipped with instrument
FlexStream Labview® Modbus driver on FlexLink™ CD
LabView®-based starter software with source available
Expandability
Additional permeation ovens
Customer-refillable gas-fed permeation oven option
Secondary diluition flow rate option; other ranges      available	0.5 to 5 lpm	0.5 to 5 lpm
Overall output gas stream dilution ratio with both primary      and secondary dilution	Up to 10,000:1	Up to 10,000:1
Humidified gas module option		Contact factory
Gas stream output Interface module option;      If secondary dilution module is installed, subtract 10 psig (69 kPa)	ambient to 40 psig (276 kPa)	ambient to 30 psig (207 kPa)
Instrument Housing (specified when ordering)
Carrying case (standard)
Expansion chassis (option); desktop or rack-mount;      2 cases maximum	3 modules per case	3 modules per case
Maximum number of modules in a single system	6	6
Power Requirements (specified when ordering)
115 VAC, 50/60 Hz
230 VAC, 50/60 Hz
Dimensions and Weight
Dimensions (Base module in carrying case)	Similar	Similar
Weight (Base module in carrying case)	Similar	Similar
Certifications
European CE Mark (230 VAC, 50 Hz)
NRTL (site-specific)	not tested
CSA (site-specific)	not tested
UL (site-specific)		not tested
Speciality Applications (Please contact the Factory)
Special diluent (carrier) gases other than inert gases
Trace moisture
Chemical compatibility issues
Heat tracing requirements
Other