ATSENSE – Flow Meter – FM-500 | Denkei Corporation Americas

ATSENSE - Flow Meter - FM-500

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The FM-500 is an advanced engine-mounted fuel meter designed to deliver accurate net fuel consumption readings by measuring flow in both supply and return lines. For engines with return systems, it uses dual detectors to capture fuel flow data. This enables precise measurement of both instantaneous and total fuel usage. Developed by ATSENSE INC., located in Tokyo, it ensures reliable performance through innovative dual-sensor technology.

Flow Meter

Model:

FM-500

Maker:

ATSENSE.

Feature

・Supports two flow detectors for both the supply and return
・Measurement of fuel consumption: supply flow rate – return flow rate
・High-speed response Analog output updated every 1ms
・Two-channel analog output Instantaneous consumption and total consumption
・USB data output Display data can be output as USB data simultaneously with analog output
・A single pulse conveniently output every 1mL for overall management of total flow
・Insulation Each input and output part is provided with isolation
・Erroneous operation is prevented by a key lock function
・Temperature and pressure measurement (option)
・Added function for temperature-corrected volume flow rate

Introduction to Functions

【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.

FM-500 Flow meter for two inputs

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)

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