GM9907-L4 Reduced Weight Controller
Quick specs
Applications
- Silo Discharge & Bagging
- Drum & IBC Filling from Bulk Tanks
- Reactor & Mixer Charge Dosing
- Continuous-Feeder Refill Control
- Rice, Grain, Flour & Feed Discharge
VARIANTS
What is the Reduced Weight Method?
The Reduced Weight Method — also known internationally as loss-in-weight — measures the weight a supply vessel loses as material discharges out of it. The vessel itself sits on load cells and acts as the scale. The controller watches the weight decrease in real time, switches between coarse and fine flow, and closes the discharge valve when exactly the target quantity has been delivered.
This is fundamentally different from gain-in-weight measurement (used by packing controllers like the GM9907-L2 / LD), where an empty weigh hopper sits below the supply and material is weighed as it falls in. The Reduced Weight method skips that intermediate weigh hopper entirely.
Why specify the Reduced Weight Method?
| Benefit | What it solves |
|---|---|
| No intermediate weigh hopper | Saves headroom, capex, footprint and a second cleaning point. Material flows in a single continuous path from supply to delivery. |
| Better for difficult materials | Sticky, hygroscopic, bridging or fluidising powders cause hang-ups in a separate weigh hopper. Keeping the material in the supply vessel reduces this. |
| Works with continuous feeders | Screw feeders, vibratory feeders and rotary valves integrate naturally with the L4 because the controller is watching the supply, not a weigh vessel. |
| Single supply vessel design | One vessel does the job of two — supply storage and weighing. Cleaner process design. |
Controller capabilities
| Feature | GM9907-L4 |
|---|---|
| Measurement method | Reduced Weight (also called loss-in-weight) |
| Recipe storage | 20 recipe groups + 9 user accumulation data sets |
| Data backup & recovery | Automatic parameter save for power-loss recovery |
| Scale configuration | Single or double scale, switchable |
| Flow control | Coarse / fine flow, programmable I/O |
| I/O | 12 inputs / 16 outputs, opto-isolated |
| Communication | RS-232, RS-485, MODBUS-RTU, MODBUS-TCP, USB |
| Display | 7-inch resistive touch screen |
Typical applications
Silo discharge bagging: rice, grain and feed mills bagging finished product directly from cooling and storage silos. Drum and IBC filling from bulk tanks: chemical, lubricant and food-grade tank discharge into shipping containers. Reactor / mixer charge dosing: dispensing a known weight of raw material into a batch process from a supply vessel. Continuous-feeder refill control: managing a buffer hopper that feeds a downstream extruder, mixer or process line.
The Modbus-TCP interface integrates batch records, dose counts and weight totals into plant SCADA or ERP systems for traceability.
OEM & ODM ready
Built for integration into your line, your machine, or your brand.
As General Measure’s South African partner, R&D Weighing supports OEM and ODM engagements across the controller range. From private-label badging through to custom rejector systems, conveyor heights, communication protocols, and full system integration with your existing PLC, MES, or ERP environment.
- Private-label finishing & branding
- Custom belt sizes & platform heights
- PLC / MES / ERP integration
- Bespoke rejector configurations
- Multi-line synchronisation
- Engineering support throughout commissioning