【 Flow Meter 】【 Twin Digital Panel Meter 】 Flow Meter TFW-200/TFM-200

Automobile engine research and development

Highly-functional twin digital panel meter

■TFW-200 Instantaneous and total flow meter
With all the functions necessary as a meter for measuring fuel flow

■TFM-200 Instantaneous flow meter
Simultaneous measurement with two flow sensors (A, B)

A high-precision, highly-functional digital panel meter with the capabilities of a measuring instrument that is specialized for flow rate Display consisting of 6-digit and 13-digit, two-level, high brightness LCD display (red and green) Compatible for CAN output Possible simultaneous output of two analog channels

Features

The first panel meter that has been used for CAN data output (option)
6-digit and 13-digit, two-level, high brightness LCD display (red and green). You can choose the display color.
A multitude of options (analog output/BCD output/CAN output/contact output/RS232 communication/RS485 communication/USB communication)

Introduction to Functions

【High-performance functions】
The functions and performance of the flow rate meter have been incorporated into the panel meter. Analog output is at a high speed of 1ms.
And you can choose from a multitude of output options to use

Instantaneous flow and total flow can be measured simultaneously
As well as the real total flow, you can also measure the average flow over any given period
Both flow sensors (A, B) can be measured at the same time, and the display and analog signal for each can be output as desired
The combinations A+B, A-B, and the average flow can also be measured as either the instantaneous or the total flow
An auto-repeat measurement is possible in which integration commences when “Start” is entered, and the display and output refreshed after a set time has elapsed, and this then repeated until “Stop” is entered.

The model configuration of the TFW-200 and TFM-200 is shown in the figure below.
When option “No” was selected the model configuration is left-justified.
Multiple options of the same option group cannot be selected.
Two types of output can be selected from among digital output, contact output, and communication.

04_TFW-200_TFM-200

Specification

Model		TFW-200	TFM-200
Name		Instantaneous and total flow meter	Instantaneous flow meter
Arithmetic
Input operations		A/AB (reversible)/A+B/A-B/AB average
Instantaneous measurement	Measurement method	Periodic calculation method (with function for predicting deceleration)
Instantaneous measurement	Measurement clock	20MHz
Total measurement	Measurement method	Scaling integration
Total measurement	Integration method	Free/timer stop/timer repeat
Operation key		5 points Separate function at measurement/setting
Memory	Memory element	Non-volatile memory
Memory	Memory content	Setting values and total flow	Setting values
Display
Display		LCD negative, backlight
Main display	Display items	Instantaneous flow
Main display	Display color, character height, number of digits	Switching between red and green backlight, 14.2mm, 6 digits + polarity (-)
Sub-display	Display items	Total flow (TFW-200 only)/comparator setting values/Instantaneous flow A – B/OFF
Sub-display	Display color, character height, number of digits	Switching between red and green backlight, 6.5mm, 13 digits + polarity (-) at 2 points
Status display	Display color	Switching between red and green backlight
Instantaneous measurement	Refresh time	0.1 to 9.9s
Instantaneous measurement	Moving average	1 to 99
Signal input (sensor input)
Number of inputs		2 inputs
Types of input signal (CH)		Single-phase (2ch) / UP/DOWN (1ch) / A/B 2-phase signal (1ch) switching
Maximum input frequency	Single-phase, UP/DOWN signal	100kHz
Maximum input frequency	A/B 2-phase signal	60kHz
Minimum input frequency		0.005Hz (only for measurement of instantaneous flow)
Frequency division (pulse average)		Signal A only, 1 to 999
Signal input (sensor input) (0) General purpose
Input level	AC (zero-cross) signal	±200mV to ±30V, LPF switching
	Signal A	±200mV to ±30V, LPF switching
	Logic signal	H level 3.9V or more, L level 1V or less (voltage resistance ±30V)
	Others	Pull-up/pull-down switching
Power supply for sensor	Voltage and maximum current	DC12V±10%, 100mA
External control input	Number of points	2 points	–
	Signal type	Contact/TTL (minimum pulse width 5ms)	–
	Items	Start/Stop/Reset/Hold switching	–
Analog output
Refresh time		0.001 to 9.999s
D/A conversion		16bit
Analog output (V) General purpose (1CH)
Number of outputs		1 output
Output items		Instantaneous flow/total flow	Instantaneous flow
Output range	Voltage output range	±10/0-10/0-5/1-5 V (load of 4.7kΩ or more)
Output range	Current output range	4-20mA (load of 560Ω or less)
Accuracy		Voltage output ±0.1%F.S. or less/current output ±0.2% F.S. or less (23℃)/temperature variation ±200ppm/℃ or less
Analog output (W) Voltage (2CH)
Number of outputs		2 outputs
Output items		Instantaneous flow/total flow	Instantaneous flow
Output range	Voltage output range	±10V (load of 4.7kΩ or more)
Accuracy		Voltage output ±0.1%F.S. or less (23ºC)/temperature variation ±200ppm/ºC or less
Contact output (C) Contact output (photo MOS relay), (O) Contact output (open collector)
Number of outputs		4 outputs
Refresh time		Analog synchronization/display synchronization switching
Output items		Comparator/unit pulse switching
Unit pulse rate, maximum frequency		0.1 to 9999.9mL/P, 1kHz
Output circuit	(C) Photo MOS relay	Maximum load voltage (peak AC/DC) 350V, continuous load current (peak AC/DC) 80mA, output ON resistance 35Ω (typical)
Output circuit	(O) Open collector	NPN open collector, maximum load voltage 30V, maximum load current 15mA
Communication (4) RS-485 (2) RS-232 (U) USB
Communication format	Serial communication	(4) RS-485/(2) RS-232/(U) USB
	Communication speed	9.6k/19.2k/38.4k bps
	Data length	7/8 bit
	Parity bit	Null/even/odd
	Stop bit	1/2 bit
	Character code	ASCII
Digital output
Output items		Instantaneous flow/total flow	Instantaneous flow
Refresh time		Analog synchronization/display synchronization switching
Digital output (T) BCD output (TTL), (P) BCD output (open collector)
Number of output digits		6 digits + polarity
Output circuit	(T) TTL	Output voltage 0-5V (output current ± 100mA, but ± 4mA/ch)
Output circuit	(P) Open collector	NPN open collector, maximum load voltage 30V, maximum load current 20mA/ch
Digital output (N) CAN
Output circuit	CAN2.0B compliance	High-Speed CAN (ISO11898-2)
	Communication speed	1Mbps/500kbps/250kbps/125kbps
	Data format	Little endian/Big endian
	ID length	Standard 11bit/Extended 29bit
	Data format	Signed long (4 bytes)
	Output refresh time	Digital output refresh time/1/2/5/10ms
General specification
Supplied power sources	(A) Power supply (AC)	AC100 to 240V ±10% (50/60Hz), (100V, 18VA or less, 240V, 24VA or less)
Supplied power sources	(D) Power supply (DC)	DC12 to 24V ±10% (10W or less)
Electrical insulation	Insulation range	Sensor input – analog output – contact output – communication and digital output – supplied power sources
Protective structure		Front panel IP66
Operating temperature and humidity range		0 to 50℃, 85%RH or less (with no condensation)
External dimensions, Weight		W: 96 H: 48 D: 100 (D: 93 inside part)
External dimensions, Weight		Approx. 230g (when equipped with all options)

Related Case Studies

Monitoring the Mixed Quantity of Two Liquids

Input of the signal from a pulse-output type flow sensor to a twin digital panel meter.