Providing an accurate net fuel consumption measurement by measuring the fuel flow in both the fuel supply line and return line with a single flow meter
【Measurement of the return】
For an engine with return, the fuel returning to the supply side will present difficulties for the measurement. It is best in this case to do the detection with a second detector installed on the return side.
Using the signals from the two detectors on the supply and the return as inputs, the FM-500 measures both the instantaneous consumption and the total consumption.
| Display | |
| Display method | 6-digit x 2 rows, character height approx. 14.2mm 7-segment LCD, green |
| Range of display and measurement | |
| Instantaneous flow and average flow of total time |
-99.999 to 999.999 L/h |
| Total flow | -99999.999 to 999999.999 L |
| Pressure | ±100kPa (attained pressure) |
| Temperature | -20.0 to 80.0℃ |
| Display refresh time | 0.1s |
| Accuracy | Excludes the accuracy of the sensor |
| Instantaneous flow and average flow of total time |
±100ppm (RD) ±2digit |
| Total flow | ±1digit |
| Pressure | ±0.5kPa |
| Temperature | ±0.5℃ |
| Signal input | |
| Number of inputs | 2 inputs (R03-R8F: Tajimi Electronics Co., Ltd.), R03-PB8M plug |
| Supply voltage for the sensor | 12V, both supply and return 100mA (max) |
| Flow sensor | |
| Output signal format | A/B phase / UP/DOWN |
| Trigger level | 2.5V (74HC365 equivalent) |
| Voltage resistance | -5V to +15V |
| Pull-up | Pulled up to 5V by 4.7kΩ |
| Input frequency | 15kHz |
| Temperature sensor | |
| Element | Pt100, 3-wire system, excitation current 0.2mA |
| Pressure sensor | |
| Input range | 1-5V (3V = 0kPa） |
| Contact input | |
| Number of inputs | 2 inputs (7.62mm-pitch terminal block) |
| Functions | Total measurement input and marker input when shorted to COM terminal |
| Trigger level | 2.5V (74HC14 equivalent) |
| Voltage resistance | -5V to +15V |
| Pull-up | Pulled up to 5V by 4.7kΩ |
| Pulse output | |
| Number of outputs | 1 output (7.62mm-pitch terminal block) |
| Output items | 1P/mL: single pulse output for each 1mL increase in total flow |
| Output voltage | 0-5V (0.5V (max) voltage drop at 1kΩ load) |
| Analog output | |
| Number of outputs | 5 outputs (BNC receptacle), instantaneous consumption and total consumption |
| Refresh time | 0.1s (switching at 1ms for instantaneous consumption only) |
| Output range | ±10V (using D/A 16-bit) |
| Accuracy | ±0.1% (FS) |
| Allowable load resistance | 10kΩ |
| Communication | |
| Interface | USB mini-B (output of display values, and receiving at the PC side using general-purpose software) |
| General specification | |
| Insulation | Power supply input/sensor signal input and contact input/analog output and pulse output |
| Power supply input voltage (power) | DC9V to 32V, 10W (max) |
| External dimensions (mm) | W: 184 H: 70 D: 196 (excluding projecting parts) |
| Weight | Approx. 810g |
| Operating temperature and humidity range |
0 to 40℃/85%RH or less (with no condensation) |
| Accessories | 5m power cable (1), and sensor connectors (2) |
An engine-mounted fuel detector.