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Glass batch silo level measurement supports material availability and refill control. It does not verify the proportions entering the furnace. A batch plant needs to preserve the distinction between the surface observed in each silo, the material assigned to that silo and the quantity delivered by the weighing system.
Follow One Ingredient From Receipt to the Weigh Hopper
Begin with a material code, not a common density for the entire plant. Silica sand, soda ash, limestone and cullet can have different pile shapes, flow behaviour and bulk densities. A level-to-stock calculation accepted for one material should not automatically follow a silo when its assigned ingredient changes.
Trace the receipt route, silo identity, discharge equipment and weigh hopper. Confirm that a diverter change updates the records for the silo actually receiving material. A correct level indication cannot detect every routing or identification mistake, and adjusting a density factor will not repair a receipt assigned to the wrong silo.
Glass Batch Silo Level Measurement and Stock Differences
| Pattern | Check first | Next step |
|---|---|---|
| Step change | Receipt timing, selected silo and transfer route. | Correct the transaction association before changing the instrument. |
| Grade bias | Bulk-density basis and the pile formed by that ingredient. | Review conversion against weighed movements for the same material. |
| No batch feed | Gate operation, feeder condition and evidence of bridging. | Investigate discharge even when the radar still sees a high surface. |
| Fill jump | Echo trace, incoming stream and moving pile peak. | Resolve the target and mounting before applying extra damping. |
Reconcile opening stock plus measured receipts against accepted batch consumption and other movements over a common time interval. Keep spills, returns and rejected batches visible. The remaining difference is an investigation result, not an instruction to force the radar-derived inventory to equal the bookkeeping figure.
Select the Antenna From the Silo Conditions
The METRAVON MV-RD21S is a bulk-solids radar with a 76 mm PE lens and a 3-degree beam. Its stated process temperature range is -40 to 80 deg C. Check incoming-material temperature and any unusual exposure before treating a nominally ambient silo as suitable for this construction.
Plot the inlet, dust extraction, roof members and expected pile position. Protect the lens from direct falling material without adding a cover in the beam. A narrow beam helps select a surface between obstructions, but it still observes a local part of the pile. At maximum fill, that point may not be the highest part of the material near the roof.
Where a PTFE-lens configuration is needed, review the MV-RD21 bulk-solids model against its offered construction. Do not transfer a temperature, chemical or area approval from another member of the product family.
Test the Refill Decision, Not Just the Display
Observe a representative receipt and subsequent discharge for each selected ingredient. Compare the radar distance and PLC indication, record the material route, and retain echo information during the dusty part of filling. Establish the low-stock warning from the quantity needed to complete planned batches and the time required to restore supply.
For the high-level action, include material already in conveyors or transfer lines after the stop command. Agree on the required independent protection with the plant designer. Two thresholds calculated from the same radar are two settings, not two independent measurements.
Batch-Plant Questions
Q1. Can the radar replace ingredient weighing?
No. A single surface distance does not establish the mass of each ingredient delivered to a recipe. Use the approved weighing system for batch proportions and use radar for the separately verified availability and filling functions.
Q2. Why does the calculated stock shift after a delivery has settled?
The pile shape and bulk density may change as material settles, even without another recorded transfer. Compare the raw distance and the settling state before changing calibration. Decide which state is used for routine stock reconciliation so successive figures remain comparable.
Summary
Keep the measurement linked to its ingredient, route and operating state. Send the glass-batch silo arrangement, material list and refill sequence for a radar configuration review. Include the required stock decision and its separate weighing references so the proposed acceptance test measures the intended result.
