Bovenkant formulier



About BaseCal

BaseCal stands for Badotherm Seal Calculator, is owned and operated by Badotherm and designed to provide diaphragm seal calculation services. The tool is intended for persons and entities wishing to calculate, simulate, and acquire knowledge regarding diaphragm seal calculations offered through the web application. The results of the calculations and the diaphragm seal performance are warranted by Badotherm, but only when the diaphragm seal application is mounted and tested by Badotherm.

In order to make use of BaseCal you need to register and create an account. How to do this is described in this Help document. You can also find how calculations and projects are made, explanations of the input data required, details of the performance outcome, and tips to improve your BaseCal.

My BaseCal

         Create an account

o    Required details. All fields are mandatory

  Name: provide your initials and family name

  Email address: provide your company email address. Accounts with unknown, public and/or private email addresses (such as will not be activated

  Password: choose your own password with a minimum of 8 characters in length

  Confirm password: retype your chosen password

  Company: Provide the name of the company you work for

  City: provide the city where your company is located

  Country: provide the country where your company is located

  Terms of Service and Privacy Policy: read the terms of service and privacy policy carefully and select the box if you agree with them. In case you wish not to accept them your account cannot be activated.

  Sign me up for the Badotherm Newsletter: with selecting this box you will be kept informed regarding important updates in BaseCal. You can always unsubscribe to the newsletter at any time. We will not share your details with other companies as is clearly outlined in our Privacy Policy.

  Register: select register to apply for an account to use BaseCal.

  Confirmation: you will receive a confirmation email after your registration has been processed. You can now start using BaseCal.

o    Email and password: once you have registered the combination of your email address and your password will allow you access to BaseCal.

o    Forgot your password: if you have forgotten your password you can request a new password by entering the email address that you have used in your registration. You will receive an email with a new password. Once you have logged on to BaseCal with this new password you can change your password again in the main menu.


o    What is a project: a project in BaseCal can be similar to a project, site, or location for which the calculations are made. Each new calculation can be linked to a project. This makes it easier to find and retrieve calculations that you have made earlier

o    Add Project: create a new project

o    Edit / delete: edit or delete an existing project. We suggest keeping your existing projects available and only deleting trial projects in order to keep a clean overview

         My calculations

o    What is a calculation: a calculation is what BaseCal is all about. Based on the data entered in 6 sections, the Diaphragm Seal Performance is calculated. The performance is measured in the Total Probable Error (TPE) and Response time (Rt) of the application

o    New calculation: start a new calculation

o    Edit / delete: edit or delete an existing calculation. We suggest keeping your existing calculations available and only deleting trial calculations in order to keep a clean overview


Create a new BaseCal calculation

         New calculation

o    Properties: Complete the properties of your calculation

  Tag no.: this field is mandatory since this is the name under which your calculation will be saved. You can fill in the tag number of the application or when a tag number is not available input your own identification. It is advisable to ensure that the combination of project name and tag number is unique

  Project name: select the project name that you defined in the previous step

  Reference: here you can input an additional reference for yourself, for example the date

  Notes: here you can input additional notes

         What needs to be measured

o    Differential pressure

  Level measurement

         Style 1: Transmitter positioned between Diaphragm Seals

         Style 2: Transmitter positioned below lowest Diaphragm Seal

         Style 3: Transmitter positioned above highest Diaphragm Seal

         Style 4: Transmitter direct mounted on one side and capillary mounted on other side

  Flow and Process dP measurement

         Style 5: Diaphragm Seals positioned horizontally

o    Gauge pressure

  Process pressure

         Style 6: Transmitter direct mounted on Diaphragm Seal

         Style 7: Transmitter positioned above Diaphragm Seal

         Style 8:Transmitter positioned below Diaphragm Seal

         Style 8 LGP: For process pressure below 200 mbar; transmitter positioned below Diaphragm Seal

o    Absolute pressure

  Process pressure

         Style 8: Transmitter positioned below Diaphragm Seal

o    Start: click start to go to the calculation screen

o    Cancel: click cancel to return to My Calculations

Managing your calculation

         Input data: will be discussed in the next chapter

         Save: Save the calculation you are working in

         Save & Close: saves and closes the calculation you are working in

         Close and discard changes: closes the calculation and discards any changes you have made in the calculation

         Send outcome to Badotherm: send an email to Badotherm to ask for assistance or verification of the calculation you have made

         Export outcome as PDF: generate a PDF document that presents the calculation details as mentioned in your calculation. Note that you can only generate a PDF document when no errors are shown

         Badotherm BaseCal3: click on the logo to return to My Calculations

         Log off: exit BaseCal

         Change password: change your current password

         Help: open the Help pages

         Notes: see the notes for this calculation

         Edit properties: Change the reference or add notes to the calculation


Input data in BaseCal

1.       Mounting position

o    H1: input length between Diaphragm Seal and transmitter according drawing

o    H2: input length between Diaphragm Seal and transmitter according drawing

o    Distance between taps:

  Style 1-3: calculated difference between H1 and H2

  Style 4: input field for distance between taps

  Style 5: input field for vertical distance between taps, when applicable

  Style 7-8: input field for distance between transmitter and tap

2.       Transmitter data

o    Brand: select the transmitter brand, or use default. The possibility of this selection depends on your user rights

o    Type: select the applicable transmitter type, or use default

o    Cell: select the applicable transmitter cell code or use default

3.       Process data

o    Distance between 0-100% level: input distance between 0-100% level

o    Interface measurement: click the box if interface measurement is required. If selected you will get the option to input a second process fluid density

o    Density of process fluid: input the density of the process fluid

o    Maximum process temperature: input the maximum process temperature. Please note that not the maximum design temperature should be used, since this will not occur during operation and will result in an unrealistic TPE result

o    Ambient temperature range: input the minimum and maximum ambient temperatures

o    Process pressure range: input the minimum and maximum process pressure. Please note that full vacuum (FV) is not a realistic value

o    Lowest pressure allowed: this value is calculated and takes the selected transmitter specifications in combination with the mounting position into consideration. The minimum process pressure must always be higher than the lowest pressure allowed

o    Span: input the span

o    Span 0%: input the span at 0%

o    Span 100%: input the span at 100%

4.       Diaphragm Seal data

o    Size: select the size of the process connection

o    Seal type: select the seal type. If you are unfamiliar with Badotherm seal types, select type BF as this is most commonly used, or check on:

o    Diaphragm material: select the diaphragm material. Please note that the selected diaphragm material might not be compatible with the selected diaphragm seal type

5.       Capillary data

o    Length: input the length of the capillary. It is advised to keep this as short as possible

o    Diameter: select the internal diameter of the capillary

6.       Filling Fluid data

o    Inert / silicon / FDA: select the type of filling fluid.

o    Name: select the name of the filling fluid If you are unfamiliar with Badotherm filling fluid names, select silicon type BSO-22 as this is most commonly used, or check on:

o    Temperature compensation: click the box if temperature compensation is required. This is advisable when the response time is long in relation with long capillary.


Performance Outcome of BaseCal

         Calculation outcome

o    Calibration: this table shows span 0%, span 100%, and the total span based on the values selected in step 1 to 6

o    Temperature: this table shows the maximum allowed process temperature and the maximum ambient temperature deviation based on the values selected in step 1 to 6

         Diaphragm Seal Performance

o    Total Probable Error consists of following components:

  Process temperature: this shows the error based on the maximum process temperature

  Ambient temperature: this shows the error based on the maximum ambient temperature deviation

  Mounting effect: this shows the ambient temperature error based on the (vertical) mounting of the transmitter and the diaphragm seals

  Accuracy: this shows the error based on the accuracy of the selected transmitter and selected diaphragm seal application

  Static pressure effect: this shows the error based on the static pressure effect of the selected transmitter and selected diaphragm seal application

  Total Probable Error: this shows the Total Probable Error of the diaphragm seal application based on the values selected in step 1-6. The total probable error is the probable error in the worst case situation and calculated by taking the square root of the sum of the square of all the previous errors. A TPE below 5% is considered to be acceptable

o    Response time

  63.8% / 90% of range: the response time is calculated based at 63.8% (US standard) and 90% (EU standard) of the span

  -20 / 25 / 35 C: The response time depends on the temperature and is calculated at the temperatures -20 / 25 / 35 C, when applicable for the selected fill fluid.


Improving the Performance Outcome of BaseCal


BaseCal is a simulation and calculation tool that helps you to select the best possible diaphragm seal application. As there is no fixed solution to arrive at the best performance result you need to play with the input values. Below you can find some tips to improve the performance of the application. If you are not satisfied with the result, you can always contact Badotherm to see if we can assist you in improving the performance.

         First step is to check which of the errors has the highest value in %. Obviously this is the error to focus on:

o    Process temperature:

  Select a different filling fluid

  Select a larger diaphragm (seal) size e.g. USL instead of US

o    Ambient temperature:

  Select a different filling fluid

  Select a larger diaphragm (seal) size e.g. USL instead of US

  Change the capillary diameter

  Apply tracing/isolation to eliminate the ambient temperature influence. This can be simulated by entering the accuracy of the tracing as minimum and maximum ambient temperature with 20 C as reference; e.g. when tracing has accuracy of +/- 2C, you input as minimum ambient temperature 18C, as maximum 22C.

o    Mounting effect:

  Change the filling fluid

  Use temperature compensation, especially when process requires inert fill

o    Accuracy

  Change the diaphragm seal size

  Change the diaphragm material

  Change the transmitter type

o    Static pressure effect

  Change the transmitter type

  Change the capillary diameter

o    Response time

  Change the filling fluid

  Enlarge the capillary diameter when possible

  Shorten capillary length

  Use temperature compensation