Technical Bulletin Mixer Calibration The Importance of Mixer Calibration It is absolutely essential to know how the mixer must be configured so that it will produce an accurate volume of concrete to specification. To configure your Reimer concrete mixer, you need to go through a calibration process. Essentially, the calibration process confirms all mixer settings for a particular mix design so that yield and strength for the desired mix will be correct. There are different elements on a mobile mixer that need to be calibrated with the materials that you will be mixing in order to ensure accurate yield – • • • • Cement: weight/meter count (i.e. discharge rate) Aggregate: gate setting Sand: gate setting Water: metered amount (W/C ratio) Your mobile mixer needs to be calibrated based on the actual materials that you use in your mix designs. Calibration ensures that the proper relationship between all materials, and the yield of mixed concrete is correct. Once your machine is calibrated you will record the mix settings and the calibration data for reference so that you will produce a consistent quantity and concrete mix. New Mixers When you first purchase a mobile mixer, a Reimer representative will come to your site to familiarize you with the machine and to assist you with the initial calibration. It is important to calibrate the mixer using the materials that you will use to produce concrete. If these materials change, for example a finer or coarser aggregate is used, it could adversely affect your mix and yield. Therefore, the mixer will need to be recalibrated. After the initial calibration, it is recommended that you reconfirm the discharge rate of the cement powder periodically. This will check that cement discharge continues to be accurate. It is good practice to regularly confirm yield for each mix design; this can be done by pouring an exact known volume and comparing it to your calibration meter count. Pre-Owned Mixers You will need to recalibrate the mixer with the materials you will be using. Never use the calibration or mix design information that may be stored in a used mixer. If you need help with the initial calibration, call Support Services at Reimer Alliance. Technical Bulletin Mixer Calibration Weighing Cement When calibrating your mixer, be sure to use a scale that is accurate to 0.2 lbs – note: a regular bathroom scale is not accurate enough. Reimer Alliance has a calibration kit available for purchase. The kit includes: • • • • An accurate scale Supporting straps Calibration worksheets Step-by-step calibration instructions The kit can be purchased for C$ 1,200.00. Producers concerned about quality and customer satisfaction make calibration a priority within their operation. Calibration is essential to ensure delivery of accurate volumes of quality concrete. Each mix design you use will need to be separately calibrated — gate settings and cement counts will be different for every design. For more information on calibrating your Reimer mobile mixer, refer to the Operator Manual, or call Reimer’s Support Services.