|
The metering unit makes use of the principle of buoyancy. A flotation cylinder is suspended from a strain gauge transducer. The cylinder is enclosed in a cylindrical vessel, all surfaces being accurately machined. A change in level of the liquid in the vessel will result in a proportionate change in the flotation force exerted on the cylinder.
The gauge is supplied with a separate panel mounting microcontroller which provides control and data acquisition resources. The microcontroller incorporates keypad and 4 x 20 LCD display plus serial communications. The gauge may be operated as an independent facility under the command of the microcontroller. Alternatively the gauge may be integrated within an overall control and data acquisition system with supervisory control implemented either by Serial Communications or by an analogue signal.
The gauge provides the following operating modes:
Mode 1: Measurement of Time to consume a selected Mass
Mode 2: Measurement of Mass consumed in a selected Time
1. Gauge fills from supply tank.
2. Filling valve closes when fuel reaches upper working level.
3. Measuring phase until fuel reaches lower working level.
4. Gauge fills again.
During the measuring phase the output from the strain gauge is continuously monitored. The operator may programme either measurement of time to consume a selected mass or measurement of mass consumed in a selected time.
An analogue output from the strain gauge amplifier is provided to indicate rate of fuel consumption to assist in the identification of gulping and other non-steady fuel consumptions.
To ensure uniform temperature of the fuel supplied to the engine, the system is continuously cycled with fuel being drawn from the gauge.
| Capacity, Standard: | 1000 gm |
| Flow Rate, maximum: | 90 kg/hr |
| Fuel Temperature, maximum: | 100°C |
| Spillback Rate, maximum: | 400% Consumption Rate |
| Gas Entrainment, maximum: | 10% by Volume |
| Calibration: | Direct Weighing of Delivered Mass |
| Operating Mode 1: | Measurement of Time to consume selected mass |
| Operating Mode 2: | Measurement of Mass consumed in selected time |
| Accuracy: | |
| Minimum measured value: | 50 gm |
| Resolution: | +/- 0.25gm |
| Mean Error: | +/- 0.1% of measured value |
| 98% Confidence Level: | +/- 0.35% of measured value |
| Operating Controls: | via Keypad |
| Data display: | presented on LCD |
| Remote Control & Data Acquisition: | RS 232 compatible |
| Signal processing: | Filtering & processing by integral microprocessor |
| Power Supply: | 240/100 V, 50/60 Hz |
Copyright © 2002 Plint Tribology Ltd.