Impact Scale FAQs
How do I know what EZ-Flo Scale model I need?
Measuring flow can be difficult. Help us understand your process. We will help you determine which model will best fit your needs. Give us a call to discuss your application, fill out our Application Data Sheet, and send pictures of your process to firstname.lastname@example.org
Where is the best place to measure flow rate in my process?
A) Our gravity flow measuring devices are inserted at vertical transition points. Some transition points are better than others which help determine the scale model and size. Typically, the closer the scale is to the flow regulator (Vane Feeder, Auger and Conveyor Discharge, etc.) the better the Process Control can perform. When the scale is at the discharge of the flow regulator, little or no delay is required for the controller to sense flow scale rate changes.
B) When little vertical height is available, the weigh loss-scale controller should be considered.
How much vertical space do I need?
This will depend on which model we recommend for our application. We have a wide selection of models and can custom build to fit your application.
What changes do I have to make to my mechanical equipment?
This will depend on your existing setup. We will help you determine what changes, if any, will be needed while discussing your application.
We work with many applications running different materials and many different flow rates and accuracy requirements.
Can I install a solid impact flow meter underneath my silo?
Yes, you will need an actuator operated control valve, rotary valve or auger, etc. between the scale and the silo cone discharge.
Will this provide an output signal for batching or blending?
Yes, our solid impact meters provide an output that can be used for batching, blending, and inventory purposes.Relay Contacts can be provided for batching applications. Pulses can be transmitted for every unit of measurement to be accumulated on a counter. An analog voltage or current analog signal, Mod Bus, Serial, etc. interface is available to indicate flow rate.
What kind of accuracy can I expect?
Accuracy will depend on the application. Typically we see accuracies of +/- 0.5% to +/- 1.25%. Running more than one density of material over a scale is going to require a readout for those different materials.
Tank Gauge FAQs
Does this work with vertical and horizontal tanks?
We have different models for horizontal and vertical tanks. Our horizontal tank gauge can be used with tanks up to 12’ tall. A vertical tank gauge will be required for tanks taller than 12’.
Will high temperature liquids be a concern?
No. All electro-mechanical components are isolated from process by the air pressurizing the tubing and the tank pipe.
What air supply do I need for a Gauge for Tanks?
Tank Gauges require an air supply. The Tank Gauge for Horizontal Tanks comes with an air supply. Tank Gauge for vertical tanks requires 100 psi clean instrument air supply to the Tank Gauge. Customers usually dedicate a small compressor with 5 gallon tank for this purpose. This dedication allows air to be furnished 24/7 without being interrupted when being supplied by plant air shutdowns.
Can this be used to make sure my tank doesn’t get overfilled?
Yes, we have a pump cutout option that can be added to disable the fill pump when the tank reaches a certain level.
What kind of accuracy can I expect?
Our tank gauges accuracy testing experiences have been to within +/- 1”.
Process Control FAQs
How many tons of material or truck loads will the silos hold?
This depends on the product density. Product density decrease when pneumatically conveying material into the silo. Bulk haulers increase the rate of flow into the silo by adjusting line pressure at the trailer. The higher the rate of flow into the silo the more the material will be aerated consequently the material pumped in will take up more space in the silo. As the material sets in the silo over time, the air trapped in the material bubbles out and consequently the silo level decreases accordingly. Silo capacities are rated in bbl or barrels ( 4 cu. ft. to a bbl). You will need to know the density of the material to find out how much the silo will hold. This gets to be more of a best guess since the density changes from a sitting state to an aerated state. For instance, hydrated lime is usually figured at a settled stated of 40 lbs/cu ft and 30 lbs/ cubic when filling.
What is the maximum flow rate of say a 12” Rotary Valve?
Call your rotary valve manufacturer to find out your flow capacity based on rpm and product density. We find that a 12” vane feeder will pass 28 tph of fly ash (figuring 65/lbs cubic foot) . When you’re feeding an auger, the auger rpm, diameter, and slope will be factors determining the flow rate.
Can Ez-Flo silo controls be tied into my blending control system to run automatically?
Yes, as long as your system accepts an analog rate signal and delivers a speed reference signal to your variable flow rate controller( VFD, etc.). We also send out a frequency where each pulse represents a unit of measurement such as tons or pounds.