Norecs HumiStat Manual
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Norecs HumiStat Manual

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Oslo Science Park
Gaustadalleen 21
NO-0349 Oslo
Norway
HumiStat Manual
Copying allowed for internal use within organisation of buyer of the product.
Other reproduction prohibited without permission from NORECS AS.
NORECS AS takes on no responsibilities for the consequences of contents, missing parts, or errors in this manual.
Date: 05/05/2021
Page 1 of 27

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  • Page 1 Copying allowed for internal use within organisation of buyer of the product. Other reproduction prohibited without permission from NORECS AS. NORECS AS takes on no responsibilities for the consequences of contents, missing parts, or errors in this manual. Date: 05/05/2021...

  • Page 2: Table Of Contents

    Oslo Science Park Gaustadalleen 21 NO-0349 Oslo Norway Contents Introduction to HumiStat ............................4 Operating principle in layman’s terms ....................... 4 Unpacking ................................... 5 The three components ............................5 Humidifier ................................. 5 2.2.1 Input gas(es) ..............................5 2.2.2 Input fluid ..............................5 2.2.3...
  • Page 3 Chemical gradient - crossover valve ........................ 20 Custom gas supply line ............................ 20 Specification ................................21 Mass flow controllers ............................21 Fluid pump ..............................21 HumiStat definition ............................21 Inputs ................................21 Output ................................21 Imperial sizes ..............................21 Pressure ................................21 Unpacking .................................

  • Page 4: Introduction To Humistat

    1 Introduction to HumiStat HumiStat is a precision gas mixer. It forms one mixture of two input gases and one input fluid. This made mixture is heated with the included heated gas delivery line, and kept above the boiling temperature of the fluid component to ensure all components remain gaseous.

  • Page 5: Unpacking

    The three components HumiStat consists of the physical humidifier, the heated gas supply line and the software. The mixer, its power supply and the heated gas line are included in the shipment. The software download link is mentioned later in this manual.

  • Page 6: Power Supply

    Version 2.5.1 Setup tab The setup tab is used to verify the connection between the software and the HumiStat, and to select the gases used. 2.5.2 Pump & fluid details The Pump & fluid details tab allows defining properties of the fluid, and limiting the maximum fluid contribution to the mixer (artificial upper limit).

  • Page 7: Setup

    3 Setup Connect the HumiStat USB cable to the computer, and the 24 VDC adapter to the HumiStat and to the mains power, and execute the HumiStat software. The software is just a single .exe file requiring no installation. The .exe file can be downloaded from http://www.norecs.com/index.php?page=Software...

  • Page 8: External Fluid Container

    Oslo Science Park Gaustadalleen 21 NO-0349 Oslo Norway External fluid container The external fluid container is not included, but a short PTFE fluid input line (1/16") is included. This line is to be connected to the C and the other end of the line submerged in the fluid to be used. The line should be submerged in the fluid container in a reliable way so that it is not possible accidentally to remove the line.

  • Page 9: Pressure Relief

    (such as separate flow controller in the instrument inlet), the excess mixture will escape out of the bubbler into the vent, without disturbing the operation of the HumiStat or the process. In case explosive gases are used, such bubbler must be made of non-shattering material (and not from glass), or placed inside safety confinement.
  • Page 10 Oslo Science Park Gaustadalleen 21 NO-0349 Oslo Norway In cases where high steam content is necessary, there are few things to consider. The power settings in the PID controller are limited by default to maximum 50% power, and to 150ºC. It may be necessary to increase those setting to ensure full evaporation.

  • Page 11: Software Features

    Oslo Science Park Gaustadalleen 21 NO-0349 Oslo Norway 4 Software features Mixture calculations The desired mixture is designed and executed on this view. It is possible to change the amount of any of the three components within the range specific for the instruments, as defined during order.

  • Page 12: Relative Humidity

    Oslo Science Park Gaustadalleen 21 NO-0349 Oslo Norway volume. Note that this is only one of the two dozen ‘standard’ volumetric definitions in world, and in this context means: 0°C at 1013.25 mbar pressure, designated here as ‘normalized’; mln aka millilitres normalized. The mixture volume per minute is also displayed for 50°C, 100°C and 150°C and the aforementioned pressure.

  • Page 13: Pump Log Tab

    Oslo Science Park Gaustadalleen 21 NO-0349 Oslo Norway Pump log tab The syringe periodically will refill, this takes some seconds, and will affect the mixture stability. On the mentioned tab some calculation info is shows, and the value for ‘Syringe refill interference cycle’ will give the frequency of the syringe refill event in minutes.

  • Page 14: Operation

    Accuracy, stability and settling times Accuracy The HumiStat uses high accuracy fluid pump and real gas calibrated mass flow controllers for precision control of inputs. The MFC is self-regulating with PID algorithm and the pumps speed is calculated and kept constant. There is no feedback loop;...

  • Page 15: Fluid Delivery Line Valve

    NO-0349 Oslo Norway If instant transition from one mixture to another is paramount, this can be achieved by using two HumiStat mixers both producing different mixtures, and a with a crossover valve selecting which mixture is led to the process.

  • Page 16: Normal Humidity

    ProboStat. In case junctions require better insulation use additional insulation such as glass fibre, or contact NORECS for insulation pads and/or loose glass fibre. If the connection is unmade and made repeatedly it is advisable to acquire more consumables for this insulation. Pieces of rock wool and thick aluminium foil make for easy and cheap although not so good-looking insulation.

  • Page 17: Flushing The Mixer

    Oslo Science Park Gaustadalleen 21 NO-0349 Oslo Norway It may even be necessary to add external heating to this point in case condensation here is observed. 5.13 Flushing the mixer In some cases the gas A can alternatively be calibrated for both the fuel and the oxidant, such as H and O .

  • Page 18: Advanced Features In The .Ini File

    Logging The software can create a log of events and save it as a file to HumiStat home folder. This feature requires CSDispatcher.exe to be located in the same folder as HumiStat. The aforementioned can be downloaded in from the Tools folder from http://www.norecs.com/work/_files/__PUBLIC_FILES__/software/HumiStat/...

  • Page 19: Minimum Flow Range Limit

    Increasing those values in the .ini file may help establishing smoother flow for the gases, when other means such as lower gas line pressure does not help. The values should not be changed without consulting NORECS. In any values outside 0 to 50 will cause errors or unwanted mixer behaviour.

  • Page 20: Use Tips

    7 Use tips Fuel cells Using two separate HumiStat units allows full control of atmosphere on both sides of the cell. Chemical gradient - crossover valve When using separate atmospheres on each side of a sample, a good way to validate results (such as voltage over sample) is to use a crossover valve.

  • Page 21: Specification

    NO-0349 Oslo Norway 8 Specification The exact specifications depend on the end user requirements, and are given in more detail in the HumiStat specification brochure, what follows is generic. Mass flow controllers In general the mass flow controllers used (Vögtlin) are real gas calibrated and considered the most accurate in the market with absolute accuracy better than 0.3% FS and 0.5% reading.
  • Page 22 Oslo Science Park Gaustadalleen 21 NO-0349 Oslo Norway Date: 05/05/2021 Page 22 of 27...

  • Page 23: Unpacking

    -> HumiStat -> Folder with the serial number of HumiStat in question. Or better yet to ensure you get the latest version ask for it at post@norecs.com On the back side of the mixer a piece of copper tube is placed over the fluid outlet tube.
  • Page 24 Gaustadalleen 21 NO-0349 Oslo Norway EC Declaration of Conformity Thursday, 16 August 2018 Manufacturer: NORECS AS Address: Gaustadalleen 21, NO-0349 Oslo, Norway We declare under our sole responsibility that the products: Model: HumiStat Description: Low pressure, mass flow controller -based gas mixing system for scientific measurements.
  • Page 25 Oslo Science Park Gaustadalleen 21 NO-0349 Oslo Norway Date: 05/05/2021 Page 25 of 27...
  • Page 26 Oslo Science Park Gaustadalleen 21 NO-0349 Oslo Norway Date: 05/05/2021 Page 26 of 27...

  • Page 27: Order Details Form

    Customer specifications HumiStat dilutes gas from mass flow controller A with gas from mass flow controller B, and adds evaporated fluid to made mixture; allowing a matrix of mixtures A x B x Fluid with dynamic ratios between these components.

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