IO Thrifty FMT-22 User manual

User’s Guide
FMT-22
Ultrasonic Flow Meter

Website: www.IOThrifty.com | Email : [e-mail] | Phone: [phone]
Contents
1. Introduction ---------------------------------------------------------------------------------------1x
1.1 Preface -------------------------------------------------------------------------------------------1
1.2 Features ------------------------------------------------------------------------------------------2
1.3 Principle of Measurement -------------------------------------------------------------------2
1.4 Parts Identification ----------------------------------------------------------------------------3
1.5 Typical Applications ---------------------------------------------------------------------------6
1.6 Data Integrity and Built-in Time-Keeper --------------------------------------------------6
1.7 Product Identification -------------------------------------------------------------------------7
1.8 Specifications -----------------------------------------------------------------------------------7
2. Starting Measurement --------------------------------------------------------------------------8
2.1 Built-in Battery ----------------------------------------------------------------------------------8
2.2 Power On -----------------------------------------------------------------------------------------8
2.3 Keypad --------------------------------------------------------------------------------------------9
2.4 Menu Windows --------------------------------------------------------------------------------10
2.5 Menu Windows Arrangement --------------------------------------------------------------11
2.6 Steps to Configure the Parameters --------------------------------------------------------12
2.7 Transducers Mounting Allocation ----------------------------------------------------------14
2.8 Transducers Installation ----------------------------------------------------------------------15
2.8.1 Transducers Spacing ------------------------------------------------------------------------16
2.8.2 V-method Installation ----------------------------------------------------------------------16

2.8.3 Z-method Installation ----------------------------------------------------------------------16
2.8.4 W-method Installation ---------------------------------------------------------------------17
2.8.5 N-method Installation ----------------------------------------------------------------------17
2.9 Installation Checkup --------------------------------------------------------------------------17
2.9.1 Signal Strength -------------------------------------------------------------------------------17
2.9.2 Signal Quality ---------------------------------------------------------------------------------18
2.9.3 Total Transit Time and Delta Time -------------------------------------------------------18
2.9.4 Time Ratio between the Measured Total Transit Time and the Calculated Time
------------------------------------------------------------------------------------------------------------19
3. How To ----------------------------------------------------------------------------------------------19
3.1 How to judge if the instrument works properly ----------------------------------------19
3.2 How to judge the liquid flowing direction -----------------------------------------------19
3.3 How to change between measurement units-------------------------------------------19
3.4 How to select a required flow rate unit --------------------------------------------------20
3.5 How to use the totalizer multiplier --------------------------------------------------------20
3.6 How to open or shut the totalizers --------------------------------------------------------20
3.7 How to reset the totalizers ------------------------------------------------------------------20
3.8 How to restore the flow meter with default setups -----------------------------------20
3.9 How to use the damper ----------------------------------------------------------------------20
3.10 How to use the zero-cutoff function ----------------------------------------------------20
3.11 How to setup a zero point -----------------------------------------------------------------21
3.12 How to get a scale factor for calibration ------------------------------------------------21
3.13 How to use the operation locker ---------------------------------------------------------21
3.14 How to use the built-in data logger ------------------------------------------------------21
3.15 How to use the Frequency Output -------------------------------------------------------22
3.16 How to use the Totalizer Pulse Output --------------------------------------------------
22
3.17 How to produce an alarm signal ----------------------------------------------------------
23
3.18 How to use the built-in Buzzer ------------------------------------------------------------24

3.19 How to use the OCT output ---------------------------------------------------------------24
3.20 How to modify the built-in calendar ----------------------------------------------------24
3.21 How to adjust the LCD contrast ----------------------------------------------------------24
3.22 How to use the RS232 serial interface --------------------------------------------------24
3.23 How to view the Date Totalizers ----------------------------------------------------------24
3.24 How to use the Working Timer -----------------------------------------------------------24
3.25 How to use the manual totalizer ---------------------------------------------------------25
3.26 How to check the ESN and other minor details --------------------------------------25
3.27 How to know how long the battery will last ------------------------------------------25
3.28 How to charge the built-in battery ------------------------------------------------------25
4. Menu Window Details ---------------------------------------------------------------------------26
5.Troubleshooting ------------------------------------------------------------------------------------31
5.1 Power-on Error Displays and Counter-Measures --------------------------------------31
5.2 Error Code and Counter-Measures --------------------------------------------------------31
5.3 Other Problems and Solutions --------------------------------------------------------------
32
6. Communication Protocol ------------------------------------------------------------------------33
6. 0 General ------------------------------------------------------------------------------------------33
6.1 Interface Pin-out Definition -----------------------------------------------------------------33
6.2 the Protocol -------------------------------------------------------------------------------------33
6.3 Protocol Prefix Usage -------------------------------------------------------------------------35
6.4 Codes for the Keypad -------------------------------------------------------------------------36
7. Model Numbers ----------------------------------------------------------------------------37
8. Warranty Terms ----------------------------------------------------------------------------37
9. Return Procedures -----------------------------------------------------------------------------37

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1. Introduction
1.1 Preface
Welcome to the FMT-22 series ultrasonic flow meter that has been manufactured
with patented technologies and equipped with more functions and advanced
performance than previous versions.
The FMT-22 Series flow meter incorporates the latest ICs manufactured, from
Philips, Maxim, TI, Winbond, and Xilinx. The hardware features the ease of
operation, high accuracy and outstanding reliability and the software provides a very
user-friendly interface. It employs a patented balanced lower voltage multi-pulse
igniting circuit which increases the anti-interference ability magnificently so that the
flow meter will work properly even in demanding industrial environments such as
those with power frequency transverter working nearby.
Other outstanding features:
 The signal receiving circuits feature self-adapting performance to ensure that
the user can easily operate the instrument without any adjustment.
 The built-in rechargeable Ni-H battery can work continuously for more than
12 hours without recharge.
The advanced circuit design, integration of the latest semiconductors, user-friendly
software interface with both in English and Chinese languages and small-sized PCB
board features combine to make the FMT-22 series ultrasonic flow meter one of the
best on the market.
1.2 Features
 0.5% of linearity
 0.2% of repeatability
 Bilingual interface in Chinese and English
 4 flow totalizers
 Patent balanced lower-voltage multi-pulse ultrasonic igniting

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 built-in date totalizers
 built-in data-logger
 Work properly near transverters
 0.5 second totalizing period
 100 Pico-second resolution of time measurement
1.3 Principle of Measurement
The ultrasonic flow meter is designed to measure the fluid velocity of liquid within a
closed conduit. The transducers are a non-contacting, clamp-on type, which will
provide benefits of non-fouling operation and easy installation.
The transit time flow meter utilizes two transducers that function as both ultrasonic
transmitters and receivers. The transducers are clamped on the outside of a closed
pipe at a specific distance from each other. The transducers can be mounted in V-
method where the sound transverses the pipe twice, or W-method where the sound
transverses the pipe four times, or in Z-method where the transducers are mounted
on opposite sides of the pipe and the sound crosses the pipe once. This selection of
the mounting method depends on pipe and liquid characteristics. The flow meter
operates by alternately transmitting and receiving a frequency modulated burst of
sound energy between the two transducers and measuring the transit time that it
takes for sound to travel between the two transducers. The difference in the transit
time measured is directly related to the velocity of the liquid in the pipe, as shown in
below.

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Where
θ is the include angle to the flow direction
M is the travel times of the ultrasonic beam
D is the pipe diameter
Tup is the time for the beam from upstream transducer to the downstream one
Tdown is the time for the beam from downstream transducer to the upstream one
ΔT=Tup –Tdown
1.4 Parts Identification
Converter:

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1.5 Typical Applications
The flow meter can be applied to a wide range of measurements. The measured
pipe ranges 20-6000 mm [0.5 - 200 inch] (optional transducers may be required). A
variety of liquid applications can be accommodated: ultra-pure liquids, potable
water, chemicals, grey water, reclaimed water, cooling water, river water, plant
effluent, etc. Because the instrument and transducers are non-contacting and have
no moving parts, the flow meter can-not be affected by system pressure, fouling or
wear.
Standard transducers are rated to 110 Deg C. Higher temperature transducers are
available.
1.6 Data Integrity and Built-in Time-Keeper
All user-inputted configuration values are retained in the built-in non-volatile flash
memory that can store them for over 100 years, even if power is lost or turned off.
Password protection is provided to avoid inadvertent configuration changes or
totalizer resets.
A time-keeper is integrated in the flow meter for the index of date totalizing and
works as the time base of flow accumulation. It keeps operating as long as the