Optex TC-Mi User manual

OPTEX CO., LTD.
5-8-12, Ogoto, Otsu, Shiga, 520-0101 Japan
Tel.[phone] Fax.[phone]
https://www.optex.co.jp/e/products/environmental-sensor/
TC-Mi
Turbidity Checker
Thank you very much for purchasing Turbidity Checker TC-Mi.
All of this instruction manual must be read before operation of the
Turbidity Checker for safe and proper operation.
This instruction manual should be kept for future reference such as
maintenance.
2023.07 59-2568-2
Instruction
Manual
The instruction manual is also available on the following website.
https://navi.optex.net/manual/05297/?lang=en
UK contact information
https://navi.optex.net/cert/contact/
EU contact information
Whole document of the DOC can be referenced in the following website;
www.optex.net

1
The Contents of Packaging Table of Contents
1. For safe use ...........................................................................2
2. Names of the parts ...............................................................4
3. Measuring principle ............................................................ 10
4. Installation ........................................................................... 11
Installing TC-Mi unit ...................................................... 11
Wiring.............................................................................. 13
Setting the DIP switch ................................................... 14
5. Operation start .................................................................. 15
6. Operation ........................................................................... 16
Setting ........................................................................... 16
Output selection ............................................................ 19
Alarm level, Alarm timer ................................................ 20
Signal output response time setting .............................. 21
Noise reduction setting ................................................... 22
Turbidity unit selection ................................................... 23
Offset adjustment ............................................................ 24
LCD contrast adjustment ................................................ 24
Digital communication setting display ........................... 25
7. Troubleshooting .................................................................. 26
8. Maintenance........................................................................ 27
9. Specifications ..................................................................... 29
10. Dimensions ........................................................................ 30
11. Digital communications ...................................................... 31
MODBUS protocol ......................................................... 31
TC-Mi protocol ............................................................... 35
1
2
3
1
2
1
2
3
4
5
6
7
8
9
TC-Mi Deaerator
Cleaning paper Instruction Manual
In the unlikely event that there are any missing components or defects, please
contact your dealer.
TC-Mi
Turbidity Checker
Thank you very much for purchasing Turbidity Checker TC-Mi.
All of this instruction manual must be read before operation of the
Turbidity Checker for safe and proper operation.
This instruction manual should be kept for future reference such as
maintenance.
Instruction
Manual
The instruction manual is also available on the following website.
https://navi.optex.net/manual/05297/?lang=en

2 3
Keep the Power off during
installation and wiring
operations.
•
Do not apply strong impact or excessive force
to the TC-Mi unit.
1 For safe use
•Please thoroughly read the “For safe use” before using the
TC-Mi properly.
•Because these precautions are related to failure or malfunction,
observe the precautions for use without fail.
Be sure to read this instruction manual in order
to use the Turbidity Checker TC-Mi properly.
Use the Turbidity Checker only for measurement of
water quality.
In order to use the TC-Mi properly, observe the following precautions.
Precautions which are the cause of failure:
" " denotes "Prohibited action", and " " denotes "Required action".
•
Do not disassemble or modify the product.
•
Turn off the Power immediately in the unlikely
event that there occur any abnormalities such
as smoke or abnormal noise. Otherwise it may
cause fire or an electric shock.
•
Do not wipe the product
with solvent. It may cause
failure.
•
To clean the product, first
wipe away lightly with a
clean soft cloth damped
by diluted mild detergent
solution and then wipe off
moisture with a dry clean
soft cloth.
Organic
solvent
Thinner
Power supply OFF
•
Be sure to use the power supply of 24 VDC.
Otherwise it may cause fire or electric shock.
24 VDC
• Make sure that TC-Mi is not
energized before installing
and wiring.
Turn OFF the power switch.
Disconnect the power cable
from the outlet.
Otherwise, it could result in
fire, electric shock, and
damage.

4 5
Deaerator
2 Names of the parts
Cable clamps
Cover
Panel
Display
Measurement value (During the setting, the setting value is displayed.)
0.1234
NTU Unit
During the setting, the setting item is displayed.
Operation keys
MODE button: enables to confirm the setting items and to determine the
setting values.
Upper and lower arrow buttons: Upper and lower arrow buttons are used to
change the setting values.
button increases a numeric value and button decreases the value.
Measurement bath DIP switch
Display
Operation keys
Fuse
Power supply
switch
Terminal block
MODE
Drain cap
Water outlet
Water inlet
Up and down buttons
[Inside panel]

6 7
Caution
Screws must be tightened securely. Otherwise, sufficient protection cannot
be obtained.
Caution
Fasten the cover fastening screws surely. If these screws are loose, turbidity
might not be measured correctly due to the light entered in the measurement
bath or dust mixed in the measurement water.
Screws for fixing the cover
Screws for fixing the cover
Open/close the cover by loosening/fastening the four cover fixing screws.
Open/close the panel by loosening/fastening the four cover fixing screws.
How to open / close the Cover
How to open / close the Panel
Caution
• Do not apply strong impact or excessive force to the joint. Otherwise, it may damage the
joint, as well as may cause crush, rupture, or disconnection of the tube.
•Water temperature must be between 0 and 40ºC.
•The unit must be isolated not to damage other machines or equipment in case of
water leakage.
•Use insert rings if necessary. To determine whether to insert rings or not, check the
specification of the tube. Selection of insert rings unmatched to the specification of
the tube may cause tube coming-off and water leakage.
•Follow the precautions below when attaching the tube.
- The cutting section must be right angle.
- Outer circumference must have no damage.
- The tube must not be shaped like an ellipse.
- The tube must be fully inserted to the end.
- Ensure that the tube is securely inserted and cannot come off after attached.
How to connect / disconnect the tube
Water outlet
Water inlet
MODE
Tube fitting
Connecting
Insert the tube to the tube
fitting.
Disconnecting
Pull out the tube while push the
lip of the tube fitting.
①
②
Applicable tube diameter for water inlet:
Nylon tube: 8 +/- 0.1 mm dia.
Urethane tube: 8 +/- 0.15 mm dia.
Applicable tube diameter for water outlet:
Nylon tube: 10 +/- 0.1 mm dia.
Urethane tube: 10 +/- 0.15 mm dia.

8 9
Water outlet
Water inlet
MODE
How to attach / detach the Drain cap
Drain cap
Caliber φ12
①
②
How to attach / detach the Deaerator
Attach the Deaerator and fix it by using the fixing screws.
Deaerator
Attaching
Insert the Drain cap as far
as it goes.
Detaching
Pull out (②) while pressing down
the tip (①) of the Drain cap.

10 11
Turbidity Checker TC-Mi uses a method of 90 degree scattered light. In
this method, a light source illuminates the surfaces of matter suspended
in the water, and the light is scattered by these surfaces is detected by
a photo element installed at an angle of 90 degrees from the light axis
of the measured light. The turbidity is determined by the amount of the
scattered light.
3 Measuring principle
Light source
Photo element
Suspended matter
Measuring light
Scattered light
Measured water
Installing TC-Mi unit
1
• The signal output cable and the power cable
must not be bound together or put in the same
cable clamps.
•
The TC-Mi unit must be installed at the place
which is well-ventilated, and is not exposed to
direct sunlight.
4 Installation
Before installation, remove the cable from the power
supply, and after completion, wire the power supply
cable.
denotes "Prohibited action" denotes "Required action"
• For wiring the unit, use the bundled cable
clamps.
•
Securely tighten the panel fixing screws. When
the screws are loose, sufficient protection
cannot be obtained.
• Make sure that TC-Mi is not
energized before installing
and wiring.
Turn OFF the power switch.
Disconnect the power cable
from the outlet.
Otherwise, it could result in
fire, electric shock, and
damage.
Keep the Power off during
installation and wiring
operations.

12 13
Install the TC-Mi unit horizontally for all
directions (front/rear, right/left).
Install the TC-Mi unit on the wall. For the mounting pitch, see the figure below.
Horizontal for front/rear
Horizontal for right/left
Caution
230 mm
(Mounting hole: 7 mm dia.)
65 mm
2Wiring
Caution
•
Be sure to use the power supply of 24 VDC. Otherwise it may cause fire or electric
shock.
•
Before installation, turn off the power supply switch, and then wire the power
supply cable. Otherwise it may cause fire or electric shock.
Terminal block
• Compatible cable diameter with the Cable Clamps is 6 to 8 mm
Digital
communication
(RS485)
Power Supply
(24 VDC)
Self-checking
or Alarm
output (O.C.)
4-20 mA
signal output
Reference
For the digital communications, refer to page 31, "11 Digital Communications".
(－) (＋)
RS485 Analog
(4-20 mA)
signal
output
Ｂ Ａ
Spare Self-checking or Alarm output (O.C.) Spare
F.G.
Power
supply
24 VDC
ON
OFF
FUSE
500 mm min.

14 15
Setting the DIP switch
3
▼▲
ON
123456 7 8
Up and down buttons
DIP switch
▲ button increases a numeric value and
▼ button decreases the value.
5 Operation start
Turn on the power
Turn on the power, then the display shows measurement value.
Attaching the panel
Attach the panel with screws (see page 6, "How to open / close the Panel").
Passing water
Start passing water through the TC-Mi unit.
•If leaking from the inlet passage, the outlet and the drain, check the connection of the
tubes, joints and drains.
•If the tube vibrate, fix the tube.
I
O
Power supply switch
Caution
•Make sure that the panel is attached securely. High water pressure may cause
water leakage, which could result in malfunction.
•Adjust the water flow rate to 100 - 200 mL/min.
Caution
Screws must be tightened securely. Otherwise, sufficient protection cannot be obtained.
1
2
3
1
2-3
4
5
SW Description
6
7-8
The 4-20 mA signal output can be kept during maintenance. Turn ON SW1
during maintenance.
ON: Hold OFF: Normal measurement
Do not use.
The standard substance of the calibration curve can be selected.
To select formazin, turn OFF SW5.
To select polystyrene, turn ON SW5.
If polystyrene is selected, 度is set for the turbidity unit automatically.
The measurement range can be
selected.
Do not use.
Fine adjustment of lower limit 4 mA and upper limit 20 mA of analog signal
output can be made.
1) Turn ON SW2.
2)
As confirming the reading of the connected equipment such as a recorder,
use the up and down buttons
▼▲ to fine-adjust the 4 mA lower limit.
3) Turn OFF SW2.
4) Turn ON SW3.
5)
As confirming the reading of the connected equipment such as a recorder,
use the up and down buttons
▼▲ to fine-adjust the 20 mA lower limit.
6) Turn OFF SW3.
Caution
Make the fine adjustment of lower limit 4 mA firstly. And then make the
fine adjustment of upper limit 20 mA. Otherwise the value of the upper
limit 20 mA cannot be adjusted accurately.
Caution
To change the measurement range via digital communication, turn OFF
SW7 and SW8.
OFF
SW7 SW8
Measurement range
OFF
OFF
OFF
ONON
ON
ON
0-100
0-20
0-2
0-5

16 17
Pass water until the water level becomes a certain.
If the water is overflowing from the measuring tank, check the measured water flow rate
and the clogging of the outlet.
Check the displayed measurement value to see if the measurement water is in stable
condition.
Attaching the cover
Checking the measurement value
Attach the cover by using screws (see page 6, "How to open/close the cover").
Caution
When passing the water for the first time, it may take time until the measurement
value becomes stable. Clean the measurement tank and the Deaerator as needed.
Checking water level
Caution
Fasten the cover fastening screws surely. If these screws are loose, turbidity might
not be measured correctly due to the light entered in the measurement bath or dust
mixed in the measurement water.
4
5
6
6 Operation
Setting
1
Measurement value is displayed after the unit is activated.
Each time the button is pressed, the setting item is changed.
Press and hold the button for 2 seconds or more to check or change the
setting.
Use the button to change the setting value. Pressing and holding the
button keeps changing the displayed value.
0.1234
NTU
1
2
Press and hold button
Measurement value display
Signal output response time
Turbidity unit selection
Offset adjustment
LCD contrast adjustment
Digital communication setting display
Output selection
(Self-Checking / Alarm)
Noise reduction setting
Use button for change, and button for determining
Use button for change, and button for determining
Alarm level setting
Use button for change, and button for determining
Use button for change, and button for determining
Use button for change, and button for determining
Use button for change, and button for determining
Use button for change, and button for determining
Return to the measured value display by the button.
* Displayed only when alarm output is selected
Use button for change, and button for determining
* Displayed only when alarm output is selected
Alarm timer setting

18 19
Output selection
2
■The following table gives default settings and setting ranges.
On the Offset adjustment setting, press and hold the and buttons for 2 seconds
or more to reset to the default value.
And then press the button to confirm Offset adjustment and shift to LCD contrast
adjustment.
Signal output
response Time
Turbidity unit selection
Offset adjustment
Digital communication
setting display
Default Setting range
60 seconds 30 to 600 seconds
Noise reduction setting Normal Normal / Enhanced
NTU NTU / FNU / 度/ None
0.0000 -1.0000 to +1.0000
MODE：Modbus RTU 1
BAUD：9600
ADDR：001
PARI：None
Refer to page 31
"11 Digital Communication"
LCD contrast
adjustment 10 1 to 20
Output selection Self-Checking Self-Checking / Alarm
Alarm level setting OFF
0.01 to measurement range upper.
Refer to page 14,
"Setting the DIP switch"
Alarm timer setting OFF 1 to 120 minutes
On the Signal output response time setting, press and hold the and buttons for
2 seconds or more to reset to the default value.
And then press the button to confirm Signal output response time setting and shift to
Noise reduction setting.
Select the output function at Self-Checking/Alarm.
•The default output selection is Self-Checking.
•When Alarm output is selected, output is reversed.
On the measurement value display screen,
press and hold button for 2 seconds or
more until beep sound is heard.
The output selection is displayed.
3
4
5Press the button to confirm output
selection and shift to alarm level setting.
* When the output selection is Self-Checking,
shift to signal output response time.
(Example) To change the output selection
from Self-Checking to Alarm.
Press and hold
Beeps
Select the cursor to Alarm by the
button.
OUTPUT
Self-Checking
Alarm

OUTPUT
Self-Checking
Alarm


20 21
Alarm level, Alarm timer
3
When the measurements get higher than the Alarm level continuously beyond the time
set by Alarm timer, the Alarm output will be produced.
When the measurements value exceeds the Alarm
level continuously for the time set by the Alarm timer,
Alarm is displayed and the Alarm output is activated.
Although the measurements get higher
than the Alarm Level, since higher
period is shorter than that of the Alarm
Timer, Alarm output will not be
produced.
When the measurements
become lower than the
Alarm Level, the Alarm
output is released.
(Higher)
Alarm Level
(Lower)
Alarm timer Alarm timer
Time
The Output will be produced.
While the measurements values are higher
than the Alarm Level, the Alarm output will
continue to be produced.
0.1234
Range of alarm level from 0.01 to measurement range upper, Refer page 14,
"Setting the DIP switch" or it can be set to OFF (no Alarm output).
•The default Alarm level setting is OFF (no Output).
(Example) To change the Alarm level from OFF to 2.0000 NTU.
6
7
Press the button to input 2.0000.
Press the button to increase the value,
and press the button to decrease the
value.
Press and hold the button to change
the displayed value continuously.
Press the button to confirm alarm level
and shift to alarm timer setting.
OFF
NTU
Alarm Level
2.0000
NTU
Alarm Level
8
9
Press the button to input 60.
Press the button to increase the value, and
press the button to decrease the value.
Press and hold the button to change
the displayed value continuously.
Press the button to confirm alarm timer
and shift to signal output response time setting.
Range of alarm timer from 1 to 120 minutes or it can be set to OFF (immediately
output an alarm).
•The default Alarm timer setting is OFF.
(Example) To change the Alarm timer from OFF to 60 minutes.
(Example) To change the signal output
response time from 60 to 300 seconds;
OFF
min
Alarm Timer
60
min
Alarm Timer
Signal output response time setting
4
Signal Output Response Time can be set for 30 to 600 seconds.
•Setting unit is 1 second
•The default value is 60 seconds.
On the measurement value display screen,
press and hold button for 2 seconds or
more until beep sound is heard. The setting
value of the signal output response time is
displayed. Response time is also displayed at
the bottom left of the screen.
10
Press and hold
Beeps
60
sec
Response Time
0.1234
NTU

22 23
11
12
Noise reduction setting
5
Select the noise reduction function at Normal/Enhanced level.
Select the cursor to Enhanced by the
button.
Example) Change from Normal to Enhanced;
13
14 Press the button to confirm noise reduction
setting and shift to Turbidity unit selection.
Noise Reduction
Normal
Enhanced

Noise Reduction
Normal
Enhanced

Noise Reduction
Normal
Enhanced
Turbidity unit selection
6
NTU
FNU
度
EPA-compliant unit
ISO7027 compliant unit
Formazine turbidity unit or polystyrene turbidity unit in Japan
Use as required.
DescriptionUnit
(Example) To change the turbidity unit from NTU to FNU;
15
16
Press the button to select the unit to
FNU.
The turbidity unit used by the Turbidity Checker can be changed according to
specific standards or usage conditions.
•The default turbidity unit is NTU.
Press the button to confirm turbidity unit
and shift to Offset adjustment.
Caution
•This device has a calibration curve using formazin standard liquid.
•The measurement accuracy will not change if the turbidity unit is changed.
0.1234
NTU
UNIT
0.1234
UNIT
0.1234
FNU
FNU
300
sec
Response Time
300
sec
Response Time
Press the button to input 300.
Press the button to increase the value,
and press the button to decrease the
value.
Press and hold the button to change
the displayed value continuously.
Press the button to confirm signal output
response time setting and shift to Noise
reduction setting.

24 25
Offset adjustment
7
(Example) Adjust in offset so that the measured value
0.1234 FNU becomes 0.0000 FNU.
The output of measuring clean water (zero turbidity) is adjusted.
•Adjustable range is -1.0000 to +1.0000.
•The default value is 0.0000.
Press the button to confirm Offset
adjustment and shift to LCD contrast
adjustment.
Press the button to confirm LCD contrast
adjustment and shift to Digital communication
setting display.
LCD contrast adjustment
8
(Example) Change the liquid crystal contrast adjustment
from 10 to 15.
Contrast in the LCD display can be adjusted.
•Adjustable range is 1 to 20.
•The default value is 10.
Use the button to input "-0.1234".
Pressing and holding the button
continuously changes the indicated value.
Use the button to input "15".
0.0000
FNU
OFFSET
OFFSET
-0.1234
-0.1234
OFFSET
FNU
FNU
888888
LCD Contrast 10
888888
LCD Contrast 15
888888
LCD Contrast 15
19
20
17
18
Press the button to shift to Measurement
value display.
Digital communication setting display
9
Display the digital communication setting.
Refer to page 31, "11 Digital Communication".
MODE: Display the communication protocol.
BAUD: Display the baud rate.
ADDR: Display the slave address. (Only Modbus)
PARI：Display the parity.
21
Communication
MODE Modbus RTU 1
BAUD 9600
ADDR 001
PARI None
0.1234
NTU

26 27
7 Troubleshooting
When Err3 is displayed, the self-checking output is produced, 3 mA is output to the signal
output.
The self-checking output is
produced.
"Error 3" is
indicated on the
Display.
"Error 4" is
indicated on the
Display.
"Error 6" is
indicated on the
Display.
TC-Mi is out of order.
A power cable is not wired.
The fuse is in the "ON" position.
Get rid of a possible cause why the
fuse has been in "ON" position, and
switch it to the normal (OFF) position.
Problem Cause Inspection and corrective action
Normal position "ON" position
Mount the cover correctly.
If the tube have length to spare, cut off
the tip. Replace the tube.
Turn OFF the power switch and turn it ON
again. If the error is displayed again, the
product must be repaired. Contact your dealer.
Internal data error
Use the equipment in the measured water
temperature (0 to 40°C) and the ambient
temperature (-20°C to 50°C).
Err3
Err4
Err6
TC-Mi needs repair. Contact your dealer.
TC-Mi needs repair. Contact your dealer.
The drain cap must be replaced.
Contact your dealer.
TC-Mi needs repair. Contact your dealer.
The display is not turn on.
The 4-20 mA signal is not
output.
Water leaks out of the
inflow port or drain port.
Water leaks out of the
drain.
Water leaks out of the
measurement bath.
The 4-20 mA signal output
does not work.
Internal
signal
error
Out of the ambient temperature
The tube is damaged.
The joint is damaged.
The drain cap is damaged.
The drain is damaged.
Dirt has been collected in the
measurement bath.
The measurement
water's flow rate is much.
The 4-20 mA analog signal
output is being fixed.
The equipment is out of order.
The inflow port or drain port is
damaged.
The power switch is not ON.
The power supply voltage is out
of specification.
Use the product within the power supply
voltage (24 VDC ±10%).
The cover is not
mounted correctly.
The equipment is
out of order.
Wire the power cable correctly.
Turn ON the power switch.
Clean the measurement bath.
Turn off DIP SW1-3.
TC-Mi needs repair. Contact your dealer.
Use the product with a measurement
water's flow rate of 100-200 ml/min.
TC-Mi needs repair. Contact your dealer.
The joint must be replaced.
Contact your dealer.

Maintenance
8 Maintenance
■Cleaning is required in proper interval (the interval depends on the water quality).
Clean the following locations:
• Clean the measurement tank and Deaerator using a clean soft cloth.
If dirt accumulates at the bottom of the measurement tank, detach the drain cap
and drain off the water before cleaning it.
• If the cover or panel is contaminated, first wipe away lightly with a clean soft cloth
immersed in a diluted mild detergent solution and then wipe off the moisture by
using a dry clean soft cloth.
• Clean the measurement windows (2 places) using a clean soft cloth.
Caution
•Do not use organic solvent such as benzene for cleaning this product.
Do not wipe TC-Mi with organic solvent such as benzine.
•
Wiping the light source window with a hard cloth may cause scratches, which disables
the correct measurement. Use a clean soft cloth or a cotton swab to remove dirt.
MODE
①
②
Pull out (②) while pressing down
the tip (①) of the drain cap.
Drain cap

28 29
Storage for a long time
Periodic inspection
■When the Turbidity Checker TC-Mi is not used over a prolonged period, keep it as
follows:
•Drain off the water from the measurement tank and keep the water. Follow the
procedure below.
(1) Stop feeding water to this product.
(2)
Detach the drain cap and let the water come out of the tank, and protect the water outlet.
(3) Wash the drain cap and keep it in a clean place.
(4)
Disconnect the tube at the water inlet (In order to protect the inflow port, keep the joint attached.).
(5) The tube does not have to be disconnected from the water outlet.
(6) Open the panel and shut down the power supply switch.
(7) Disconnect the power cable from the power source and attach the panel.
•Keep TC-Mi at a place not being exposed to direct sunshine.
■Inspect the following items every month:
•Scratches on the cable or cable deterioration
•Water leakage from the water inlet, water outlet, or drain
•Check if the unit outputs a correct value when the measurement water with known
concentration is used.
•If the cover or display area is contaminated, clean it by using a clean soft cloth.
■Inspect the following items every 3 months:
•Ensure that TC-Mi is fixed securely.
•Ensure that TC-Mi is not damaged.
•Make sure that the screws of the Terminal Block are not rusted.
Pull out the tube as pushing
the end of the joint in.
Caution
•Leaving the drain cap in place allows rain to come into the measurement tank.
The drain cap must be detach and kept.
•Be careful not to damage the water inlet and outlet. Damage causes water
leakage and could result in malfunction, which requires replacement of the unit.
9 Specifications
Specifications are subject to change without prior notice.
0.0000 to 9.9999 NTU : 0.0001 NTU
10.000 to 100.00 NTU : 0.001 NTU
LEDLight source
Measurement method
Select from 0 to 2, 0 to 5, 0 to 20 and 0 to 100
(NTU/FNU: Formazine standard solution)
Select from 0 to 2, 0 to 5 and 0 to 20
(度: Polystyrene standard solution)
Measured water flow
Measuring range
Display resolution
Normal: 100 mA max., During activation: 600 mA max.
24 VDC ±10%
Current consumption
0.001 mA Signal output resolution
LCD monitorDisplay
Digital communication
MODBUS protocol (RS485)
TC-Mi protocol (RS485)
Output Analog (4 to 20 mA) signal output : resistive load 300Ω max.
Self-checking or Alarm output : open collector (NPN, 24 VDC 50 mA max.)
Power supply voltage
PPO, AES, SUS316L
-20 to +50ºC, humidity 95%Rh or less
W x H x D 259 x 157 x 147 mm
approx. 2 kg
IP65
Flowmeter : TC-Mi-FL
Weight
100 to 200 mL/min
0 to +40ºC (unfrozen)
Measuring water
temperature
Ambient temperature
Dimensions
Degree of protection
Option
Main material
TC-Mi
90degree light-scattering method
Model No.
Turbidity CheckerName

30 31
10 Dimensions
(Unit: mm)
147
144 Mounting pitch: 230
259
200
(140 max.)
Mounting pitch: 65
29
111 17
3516
116 Applicable cable
diameter: ø6 to 8
Drain
OUT IN
Mounting holes: ø7
11
◆Communication Method
◆Frame Configuration
ASCII
RTU
：
OM1 RTU/ASCII
OM2 RTU/ASCII
4, 6
3,16
Mode Start
2 chars
1 byte
Slave address
2 chars
1 byte
Function code
n chars
n byte
Data
2 chars
2 byte
Error check
CR, LF
End
Start RTU 3.5 chare silence
ASCII "："character
Data RTU 0-N bytes with response data from the device.
ASCII 0-N bytes with response data from the device in hex characters.
End RTU 3.5 chare silence
ASCII "CR","LF" character
Slave address
Function code
RTU CRC
Error check ASCII LRC
Common 1 to 247
Item Mode Description
MODBUS protocol
1
Digital communications
Baud rate
Data bits
Start bits
Stop bits
Parity bit
Slave address
MODBUS only
TC-Mi protocol
9600 (default) / 14400 / 19200 / 38400 bps
8 bit
1 bit
1 bit
None (default) / Odd / Even
1 (default) to 247
Compliant Standard
Transmission Method
Protocol
Based on EIA RS-485
2-wire, semi-duplicate
MODBUS RTU 1 (default)
MODBUS ASCII 1
MODBUS RTU 2
MODBUS ASCII 2
Item Description
OM1
OM2
OM1
OM2
4
6
Read registers.
Write resisters.
3
16
Read registers.
Write resisters.
Function Code
Mode Description

32 33
◆Exception Codes
◆Data Type
◆Register Map 1 (OM1 selection)
・Exception codes (codes indicating the error details)
・ushort (unsigned short)
1Illegal function
Exception
codes Name Description
0002
Read: Confirm measurement state
(In measurement = 0xFFFF, Not in measurement = 0x0000)
Write: Start measurement (write in 0xFFFF)
0003 Stop measurement (write in 0xFFFF)
Output selection
Serial number
Error number
Parity
Protocol
Baud rate
Slave address (default = 1)
Measured value
Unit indication
Offset adjustment value
Span adjustment value
ushort
ushort
ushort
string
ushort
ushort
ushort
ushort
ushort
float
ushort
float
float
R
-
R
R
R
R
R
R
R
R
R
R
R
W
W
W
-
-
W
W
W
W
W
W
W
W
Register(Dec)
1
1
0020 1
0047-0054 8
0070 1
0083 1
0084 1
0085 1
0087 1
0100-0101 2
0110 1
0111-0112 2
Signal output response timeushortR W0123 1
Measurement rangefloatR W0124-0126 2
Alarm levelfloatR W0140-0141 2
Alarm timerushortR W0149 1
Noise reduction settingushortR W0196 1
0115-0116 2
Size (registers) R(Read)/W(Write) Data type Description
・The returned value is the sum of the function code of the request message and 0x80 (one is set on the MSB).
Ex.) This is 0x04 if the error is caused by read-out operation 0x84.
This is 0x06 if the error is caused by write-in operation 0x86.
The function code received in the query is not an allowable action for the slave. If a Poll Program
Complete command was issued, this code indicates that no program function preceded it.
5Acknowledge
The slave has accepted the request and is processing it, but a long duration of time will be required
to do so. This response is returned to prevent a timeout error from occurring in the master. The
master can next issue a Poll Program Complete message to determine if processing is completed.
6Slave device busy The slave is engaged in processing a long–duration program command. The master
should retransmit the message later when the slave is free.
2Illegal data address The data address received in the query is not an allowable address for the slave.
3Illegal data value A value contained in the query data field is not an allowable value for the slave.
4Slave device failure
An unrecoverable error occurred while the slave was attempting to perform the requested action.
MSB LSB XXXX XXXX
byte0
XXXX XXXX
byte1
where ‘S’ = sign bit, ‘X’ = exponent bits and ‘M’ = mantissa bits.
・float (IEEE 754 format, single byte)
LSBMSB SXXX XXXX
byte0
XMMM MMMM
byte1
MMMM MMMM
byte3
XXXX XXXX
byte4
・string
MSB XXXX XXXX
byte0
XXXX XXXX
byte1
XXXX XXXX
byte3
XXXX XXXX
byte4
LSB
XXXX XXXX
byte15
・・・
・・・
0xAAFF
0xAA00
Value
MODBUS ASCII 1 (OM1)
MODBUS RTU 1 (OM1) (default)
Transmission mode
0xAA01 MODBUS RTU 2 (OM2)
0xAAFE MODBUS ASCII 2 (OM2)
0xAA0F TC-Mi protocol
・Protocol
(Ex.) When changing from "MODBUS RTU 1 (OM1)" to "TC - Mi protocol". (When slave address=1)
Request command
Slave
address
Function
code
Start Data Error check End
Return the value written directly after receiving the request command normally.
(When it can't normally be received, an error code is returned.)
Normal response
Start Data Error block End
Slave
address
Function
code
01 06 0054AA0F F6BE
01 06 0054AA0F F6BE
Caution
•Reset the power supply after changing protocol, baud rate or slave address or
parity. The settings do not change until power reset.
•When Alarm output is selected in Output selection, output is reversed.
◆Register Map 2 (OM2 selection)
0305 Parity
Slave address (default = 1)
Serial number
Error number
Error details
Measured value
Measurement range
Signal output response time
Offset adjustment value
Span adjustment value
Noise reduction setting
Output selection
ushort
ushort
string
ushort
ushort
float
float
ushort
float
float
ushort
ushort
R
R
R
R
R
R
R
R
R
R
R
R
W
W
-
-
-
-
W
W
W
W
W
W
Register(Dec)
1
0301 Baud rateushort R W1
0300 Protocolushort R W1
0350 1
4000-4007 8
4132 1
4133 1
4200-4201 2
4204-4205 2
4246 1
4247-4248 2
4249-4250 2
6570 1
Alarm levelfloatR W6202-6203 2
Alarm timerushortR W6218 1
Unit indicationushortR W6720 1
Read : Confirm measurement state
(In measurement = 0xFFFF, Not in measurement = 0x0000)
Write : Start measurement (write in 0xFFFF),
Stop measurement (write in 0xFFFF)
ushortR W6671 1
6200 1
Size (registers) R(Read)/W(Write) Data type Description

34 35
Number
Err3
Err4
Err6
2
3
5
Internal signal error
Temperature error
Internal data error
Description
・Error number (OM1)
0x0401
4132
Register
0x0402
0x0102
4133
0x0200
0x0402 0x10##
Description
・Error number and details (OM2)
1
0
Value
Unit indication N/A
NTU (default)
FNU
Degree "度"
Description
2
3
0xAA03
0xAA02
Value
9600bps (default)
14400bps
19200bps
38400bps
Description
0xAA04
0xAA05
・Unit selection (OM1)
0xAA01
0xAA00
Value
Unit indication N/A
NTU (default)
FNU
Degree "度"
Description
0xAA02
0xAA03
・Unit selection (OM2)
1.00
Default
0.30 to 3.00
Setting range
・Adjust the span (OM1/OM2 common)
Adjust the span scaling factor.
1
0
Value
Normal (default)
Enhanced
Description
・Noise reduction (OM1)
0xAA01
0xAA00
Value
Normal
Enhanced
Description
・Noise reduction (OM2)
2
1
Value
Self-Checking (default)
Alarm
Description
・Output selection (OM1)
0xAA01
0xAA00
Value
Self-Checking
Alarm
Description
・Output selection (OM2)
・Baud rate (OM1/OM2 common)
0xAA01
0xAA00
Value
None (default)
Odd
Even
Description
0xAA02
・Parity (OM1/OM2 common)
Err3
Err4
Err6
Internal signal error
Temperature error
Internal data error
(## is any value)
◆Frame Configuration
◇Start measurement
◆Operation Details
TC-Mi protocol
2
STX
Start
n byte
Command
n byte
Data
CR
End
Request command STX
byte0
A
1
B
2
CR
3
Normal response
Step1
STX
byte0
A
1
ACK
2
CR
3
A
M
E
L
W
(0x41)
(0x4D)
(0x45)
(0x4C)
(0x57)
Command 1
B
D
ACK
O
S
R
T
U
A
a
K
P
B
p
N
O
S
R
T
U
A
a
K
P
B
p
N
(0x42)
(0x44)
(0x06)
(0x4F)
(0x53)
(0x52)
(0x54)
(0x55)
(0x41)
(0x61)
(0x48)
(0x50)
(0x42)
(0x70)
(0x4E)
(0x4F)
(0x53)
(0x52)
(0x54)
(0x55)
(0x41)
(0x61)
(0x48)
(0x50)
(0x42)
(0x70)
(0x4E)
-
-
Command 2
Start measurement
Stop measurement
Command received normally
Output measured value
Output error number
Read out offset adjustment value
Read out span adjustment value
Read out measurement range
Read out signal output response time
Read out unit selection
Read out alarm level
Read out alarm timer
Read out output selection
Read out protocol
Read out baud rate
Read out parity
Read out noise reduction setting
Overwrite offset adjustment value
Overwrite span adjustment value
Overwrite measurement range
Overwrite signal output response time
Overwrite unit selection
Overwrite alarm level
Overwrite alarm timer
Overwrite output selection
Overwrite protocol
Overwrite baud rate
Overwrite parity
Overwrite noise reduction setting
Description
Return ACK directly after receiving the request command normally.
(Return nothing unless the command can be received normally.)
Caution
•Reset the power supply after changing protocol, baud rate or slave address or
parity. The settings do not change until power reset.
•When Alarm output is selected in Output selection, output is reversed.

36 37
◇Overwrite span adjustment value
Request command STX
byte0
W
1
S
2
Value
3,4,5,6
CR
7
Normal response STX
byte0
W
1
Value
2,3,4,5
CR
6
Return the written span adjustment value directly after receiving the request command.
(Return nothing unless the command can be received normally.)
Send the decimal value as ASCII code by LSB first.
(Ex.) "1.00" = 02, 57, 30, 30, 2E, 31, 0D
◇Read out measurement range
Request command STX
byte0
L
1
R
2
CR
3
Normal response STX
byte0
L
1
Value
2-7
CR
8
◇Overwrite measurement range
Request command STX
byte0
W
1
R
2
Value
3-10
CR
11
Normal response STX
byte0
W
1
Value
2-9
CR
10
Return the written measurement range directly receiving the request command.
(Return nothing unless the command can be received normally.)
Send the decimal value as ASCII code by LSB first.
(Ex.) "20.000" = 02, 57, 30, 30, 30, 2E, 30, 32, 0D
Return the measurement range directly receiving the request command.
(Return nothing unless the command can be received normally.)
Send the decimal value as ASCII code by LSB first.
(Ex.) "100.00" = 02, 4C, 30, 30, 2E, 30, 30, 31, 0D
・Adjust the span
Adjust the span scaling factor.
1.00
Initial value
0.30 to 3.00
Setting range
◇Read out span adjustment value
Request command STX
byte0
L
1
S
2
CR
3
Normal response STX
byte0
L
1
Value
2,3,4,5
CR
6
Return the span adjustment value directly after receiving the request command.
(Return nothing unless the command can be received normally.)
Send the decimal value as ASCII code by LSB first.
(Ex.) "1.00" = 02, 4C, 30, 30, 2E, 31, 0D
0
3
4
Normal (No. 0 is sent if normal)
Internal signal error
Out of the ambient temperature
Err3
Err4
Value Description
Output error number STX
byte0
E
1
Value
2
CR
3
Output measured value
Step2
STX
byte0
M
1
Measured value
2-7
CR
8
After sending ACK, send the measured value and error code in order.
(As soon as measurement is completed, send the measured value and error code in order one by one.)
Send the decimal value as ASCII code by LSB first.
(Ex.) "0.0050" = 02, 4D, 30, 35, 30, 30, 2E, 30, 0D
◇Stop measurement
Request command STX
byte0
A
1
D
2
CR
3
Normal response STX
byte0
A
1
ACK
2
CR
3
◇Read out offset adjustment value
Request command STX
byte0
L
1
O
2
CR
3
Normal response STX
byte0
L
1
Value
2-8
CR
9
Return the offset adjustment value directly after receiving the request command normally.
(Return nothing unless the command can be received normally.)
Send the decimal value as ASCII code by LSB first.
(Ex.) "+0.0001" = 02, 4C, 31, 30, 30, 30, 2E, 30, 2B, 0D
"+0.0000" = 02, 4C, 30, 30, 30, 30, 2E, 30, 2B, 0D
(With signs. If zero, put the + sign.)
Return ACK directly after receiving the request command normally.
(Return nothing unless the command can be received normally.
→Measurement will continue.)
◇Overwrite offset adjustment value
Request command STX
byte0
W
1
O
2
Value
3-9
CR
10
Normal response STX
byte0
W
1
Value
2-8
CR
9
Return the written offset adjustment value directly after receiving the request command normally.
(Return nothing unless the command can be received normally.)
Send the decimal value as ASCII code by LSB first.
(Ex.) "+0.0001" = 02, 57, 31, 30, 30, 30, 2E, 30, 2D, 0D
"+0.0000" = 02, 57, 30, 30, 30, 30, 2E, 30, 2B, 0D
(With signs. If zero, put the + sign.)