DM4N Series
Digital Tank Gauge Transmitter
OUTLINEThe DM4N series is a digital data transmitter with a built-in microprocessor. Installed at tank side, the DM4N series collects and transmits
liquid level data in digital signals from tank gauges as well as liquid
temperature from sensors inside tanks and status contact signals fromvalves or others used for loading and unloading operations.
Keeping the compatibility of signals and installation methods with theexisting well-established DM4 series the DM4N has enhanced its reliability much more.

MODELS● 2-way communication type: DM4N-2Upgrading the existing DM4-2 type with 2-way bus communication,
the DM4N-2 is capable of transmitting information additionally fromthe control room to the tank side. Thus, the DM4N-2 allows us tomanipulate equipment remotely in addition to monitoring of liquid
levels and status of tank operation. By sharing a common bus line
on which multiple equipment can be connected in series, the wiring
cost is reduced significantly. The same bus line is used for FW9000N also as the bus is compatible with its standard output signal.
● 1-way communication type: DM4N-1 and DM4N-3

Both models are compatible with DM and DB-M type transmitterswhich transmit signals from the tank side to the control room in one
direction. Two types are available; one is DM4N-1 which is the successor to DM4-1 with a 2-wire system, common to both power andsignal; the other is DM4N-3 which is the successor to DM4-3 withan AC power supply system.

FEATURES● No transmission error with resolution of 1 mm thanks to digitaltransmission● High reliability and conversion accuracy with ± 1mm● Easy calibration by using an in-house counter for transmitter moni-toring● Easy expansion and replacement because of compatibility with theexisting other TOKYO KEISO's level transmitters● Connectable to the existing spot type and multipoint averaging tem-perature sensors● Remote monitoring and control in combination with TOKYOKEISO's digital tank data receiving instruments.
● Continuous power supply 85 to 240 V AC 50/60 Hz for AC types● Flameproof construction complying with TIIS d2G4 is standardized

for all models● Lightning protection circuit with much more increased safety thanexisting models is provided as standard

APPLICATIONS
Remote monitoring and control for tank operation for:Cone-roof tanks, Floating-roof tanks for crude oil, LPG tanks with pressure, Tanks for refinery and others

TG-L1014-0EFEB. 2012K

DM4N Series digital tank gauge transmitter

2-WAY COMMUNICATION TYPE：DM4N-2■ SPECIFICATIONS DM4N-2
CONTENTSITEMSApplicable level gauges(1) FT-1000 series Spring balance type(2) FT-2000 series Servo balance type(3) FW-2200 series All wire servo balance type(4) FP-1000 series Magnet float type(5) Other manufacturers' tank side level gauges. Couplings are available.

Connectable receivers asexamples

CATAMS Tank monitoring system, NMR-4000 series, DIR-530 series

Level conversion range : 0 to 40 m, 0 to 60 m
Resolution: 1 mmConversion accuracy: ±1 mm
Temperature elements : Pt, JPt, Cu
Element configuration : Spot, Averaging temperature sensors ATM, Multi-points and averaging temperature sensors ATS, 3-wire independent spot
Conversion range: -199 to 299°C compatible output with FW-9000, -199 to 199°C compatible outInputs
put with DM-II(2) Temperature
Resolution: 0.1°C
Conversion accuracy : ±0.6°C at 25°C
Element intervals: 1 m, 2 m, 3 m, On request, Switching hysteresis : 100 mm
Number of elements : 10 as standard, maximum 16 for ATM and ATS,
3 as standard, maximum 6 for 3-wire independent spot
(3) External contact signals : 4 or 10 in number, 12 VDC, 5 mA
3 micro-switches with rating 250 VAC/3 A, 125 VDC/0.4 A (resistance load)(1) Alarm outputs
1 relay contact signal with rating 250 VAC/3 A, 30 VDC/3 A (resistance load)
Controlled by receiving instrument, Ordinary relays or Latching relays 4 to 10 in number.
OutContact rating: 250 VAC/3 A, 30 VDC/3 A (resistance load)puts (2) Relay output forProtection of contact : A varistor is standardized. When connecting induction load, connect a spark
external control
arrester on the load.
(3) Output for DIR-110 Connectable with TOKYO KEISO's DIR-110 type tank side indicator
Transmission method 2-way, 2-wire bus line system with maximum 16 transmitters/bus line
(1) Compatible withTransmission signals
Requesting : Voltage signal, Answering : Current modulation signal
Transmission distance Wiring resistance of single line must be 170 Ω or less and capacitance
FW-9000 type
between wires 0.4 µF or lessTransmission method 2-way, 2-wire bus line system with maximum 16 transmitters/bus line
Com- (2) Compatible withTransmission signals
Requesting : Voltage signal, Answering : Current modulation signal
Transmission distance Wiring resistance of single line must be 170 Ω or less and capacitance
DM-II typemunibetween wires 0.8 µF or lesscation(3) Compatible with
Compatible with TOKYO KEISO's optical communication system
FW-9000 opticalcommunication type(4) Compatible with V1Compatible with products of Endress + Hauser(under preparation)
85 to 264 VAC 50/60 Hz
Power supply
4.3 VA at steady statePower consumption
Lightning arrester is built-in in signal and power line
Lightning protection
Ambient temperature-10 to +60°C
Flameproof TIIS d2G4,TIIS d2G5 for optical communication type
Construction
Protection class IP65
Number of cable entries
Maximum 4 (1" x 3 and 1/2" x 1)
Housing material
Aluminum alloy casting
Approximately 12 kg
Mass
Painting color
Silver(1) Level■ DIMENSIONS DM4N-2（Electrical transmission type）
2TOKYO KEISO CO., LTD.

（Optical transmission type）

12345Body
Terminal boxOptical unit
PlugCoupling

TG-L1014-0E

DM4N Series digital tank gauge transmitter■ MODEL CODE DM4N-2
DM4N-2-1-T-D-M

Compatible with FW-9000 standard output type12Signal format＊ 34Power supply
1

Measuring range

CONTENTS/Compatible with DM-II transmitter typeCompatible with FW-9000 optical output typeCompatible with V1 (under preparation)
85 to 264 V AC 50/60 Hz
12Temperature sensors

40 m
60 m（One microswitch is used.）
0No element

1Spot

2Average-1 ATM
Average-2 ATS

3Average-3 3-wire independent spot
No element（No code required if elements not involved）
Pt 100 Ω at 0°C

4Temperature elements

012

JPt 100 Ω at 0°C

3Cu 100 Ω at 25°C012Temperature conversion range

No element（No code required if elements not involved）-199 to 299°C compatible output with FW-9000

1-199 to 199°C compatible output with DM-II
No spot nor element（No code required if elements not involved）
1 m interval

2

2 m interval

3

3 m interval
Other interval
No spot nor element（No code required if elements not involved）

0Average temperature elementinterval＊ XNumber of temperature elements

0A3＊

10 elements or less for ATM/ATS
3 elements for 3-wire independent spot
Number of elements
When using ATM/ATS : n=B to G (11 to 16 elements)
When using 3-wire independent spot : n=4 to 6
None
4 or less5 or more
When using compatible output with DM-II n=5 to A (A=10)
When using other signal format n=5 to 8
None
4 or lessn04

Number of contact inputs

＊n04

＊

5 or more
When using compatible output with DM-II n=5 to A (A=10)
When using other signal format n=5 to 8Ordinary relaynNumber and type of contact outputs
12Latching relay
NO contact

12

NC contact
None
Designate a required number in "n" .
(n=1 to 3. However, one microswitch is used, when the measuring
nrange is 60 m. Also, one microswitch is used to stop hoisting of thefloat when using hoisting function of the servo balance type tankgauges.)/ E An output to DIR-110
0

Level alarm outputs

Options/ R A relay output for alarm/ S A lightning arrester for the average temperature indication＊…Optional requirements

TG-L1014-0ETOKYO KEISO CO., LTD.

3DM4N Series digital tank gauge transmitter

1-WAY COMMUNICATION TYPE：DM4N-1, DM4N-3■ SPECIFICATIONS DM4N-1, DM4N-3
ITEMS

DM4N-1

CONTENTS
DM4N-3

Applicable level gauges(1) FT-1000 series Spring balance type(2) FT-2000 series Servo balance type(3) FW-2200 series All wire servo balance type(4) FP-1000 series Magnet float type(5) Other manufacturers' tank side level gauges. Couplings are available.

Connectable receivers asexamples

CATAMS Tank monitoring system, NMR-4000 series, DIR-530 series(1) LevelInputs (2) Temperature

Level conversion range : 0 to 40 m, 0 to 60 m
Resolution: 1 mmConversion accuracy: ±1 mm
Temperature elements : Pt, JPt, Cu
Element configuration : Spot, Averaging temperature sensors ATM,Conversion range: -199 to 199°C
Resolution: 0.1°C
Conversion accuracy : ±0.6°C at 25°C
Element intervals: 1 m, 2 m, 3 m, On request
Switching hysteresis : 100 mm
Number of elements : 10 as standard, maximum 16 for ATM

Temperature elements : Pt, JPt, Cu
Element configuration : Spot, Averaging temperature sensors ATM, Multipoints and averaging temperature sensors ATS, 3wire independent spot
Conversion range: -199 to 199°C
Resolution: 0.1°C
Conversion accuracy : ±0.6°C at 25°C
Element intervals: 1 m, 2 m, 3 m, On request
Switching hysteresis : 100 mm
Number of elements : 10 as standard, maximum
16 for ATM and ATS,
3 as standard, maximum
6 for 3-wire independent
spot
4 or 8 in number, 12 VDC, 5 mA(3) External contact signals 8 in number, 5 VDC, 0.5 mA(4) Tank number transThe number is set by a rotary switch in 4 digits hexadecimal notation
mission3 micro-switches with rating 250 VAC/3 A, 125 VDC/0.4 A (resistance load)−
1 relay contact signal with rating 250 VAC/3 A,(1)
Alarmoutputs
Out30 VDC/3 A (resistance load)puts
Connectable with TOKYO KEISO's DIR-110 type−(2) Output for DIR-110
tank side indicator
Transmission method
Transmission signal
Communication

Signal format/
Transmission distance

Calibration
Power supply
Power consumption
Lightning protection
Ambient temperature
Construction
Number of cable entries
Housing material
MassPainting color

Signal line 1:1 (2 lines/transmitter)
Signal line matrix (2 lines/transmitter)
Select line matrix (4 lines/transmitter)
Answering : Current modulation signal(1) Compatible with DM type (100/150 mA) Wiring resistance of single line is 44 Ω or less and capacitance between wires 0.8 µF or less
(2) Compatible with DB-M type (70/110 mA) Wiring resistance of single line is 60 Ω or less and capacitance between wires 0.4 µF or less(3) Compatible with DM type (10/20 mA) Wiring resistance of single line is 170 Ω or less and capacitance between wires 0.8 µF or less(4) Compatible with DB-M type (10/20 mA) Wiring resistance of single line is 170 Ω or less and capacitance between wires 0.4 µF or lessWith an indication counter for calibration of transmitter's output value
20 to 35 VDC supplied via signal line to receiver 85 to 264 VAC 50/60 Hz
Maximum 150 mA
4.3 VA at steady state
Lightning arrester is built-in in signal and power line
-10 to +60°C
Flameproof TIIS d2G4
Protection class IP65
Maximum 4 (1" x 3 and 1/2" x 1)
Aluminum alloy casting
Approximately 12 kg
Silver■ DIMENSIONS DM4N-1, DM4N-3

4TOKYO KEISO CO., LTD.

TG-L1014-0E

DM4N Series digital tank gauge transmitter■ MODEL CODE DM4N-1, DM4N-3
DM4N-Power supply--T-D-M/185 to 264 VAC 50/60 Hz

3Signal format

1Compatible with DM type (100/150 mA)

2Compatible with DB-M type (70/110 mA)

3Compatible with DM type (10/20 mA)

4

Wiring method

Compatible with DB-M type (10/20 mA)
Signal line 1 : 1, Signal line matrix

1Select line matrix
40 m

2

Measuring range

160 m（One microswitch is used.）

2Temperature sensors ※10No element

1Spot

2Average-1 ATM

3

Average-2 ATS applied only for DM4N-3

4

Average-3 3-wire independent spot applied only for DM4N-3

Temperature elements

0No element（No code required if elements not involved）

1

Pt 100 Ω at 0°C2

JPt 100 Ω at 0°C
Cu 100 Ω at 25°C

3

Temperature conversion range

Average temperature element interval

No element（No code required if elements not involved）

0-199 to 199°C

10No spot nor element（No code required if elements not involved）

1

1 m interval

22 m interval

33 m interval
Other interval＊ X
0

No spot nor element (No code required if elements not involved)

A10 elements or less for ATM/ATS
3 elements for 3-wire independent spot applied only for DM4N-3

3

Number of temperature elements＊

Number of elements
When using ATM/ATS : n=B to G (11 to 16 elements)
When using 3-wire independent spot : n=4 to 6nTank number transmission

Number of contact inputs

0None

1

Yes in 4 digits hexadecimal notation
0None

44Designate a number in "n" out of 5 to 8

＊ n

Level alarm outputs

OptionsCONTENTS
20 to 35 VDC supplied via signal line to receiver

0NonenDesignate a required number in "n" .
(n=1 to 3. However, one microswitch is used, when the measuring
range is 60 m. Also, one microswitch is used to stop hoisting of thefloat when using hoisting function of the servo balance type tankgauges.)/ E An output to DIR-110 applied only for DM4N-3/ R A relay output for alarm applied only for DM4N-3/ S A lightning arrester for the average temperature indication＊…Optional requirements※1…When using DM4N-1 type whose current of signal format is 10/20 mA, you can not select other than "No element".

TG-L1014-0E

TOKYO KEISO CO., LTD.

5

DM4N Series digital tank gauge transmitter■ ORDERING INFORMATION◎ Model code
• 2-WAY COMMUNICATION TYPE
□ DM4N−2−□□□−T□□□□□−D□□□□−M□／□□□• 1-WAY COMMUNICATION TYPE
□ DM4N−1−□□□−T□□□□□−D□□−M□／□□□□ DM4N−3−□□□−T□□□□□−D□□−M□／□□□Please enter the applicable code numbers when ordering.
◎ Type and specifications of level gauges to which this transmitter is to be connected□ When installing the transmitter and level gauge simultaneously□ When installing the transmitter connecting to existing TOKYO KEISO's level gauges
If so, enter our manufacturing No. of existing level gauges :(Note: Manufacturing number is on name plates and PRODUCT SPECIFICATION in the form of L12-90027 for example)
Tag No. or Tank No. :□ When installing the transmitter connecting the existing other manufacturer's level gauges
Name of manufacturer :Model No.
Year of delivery::

When placing an order, state the dimension and connection size of coupling for installation. Consult TOKYO KEISO for details.
◎ Up to 3 contact signals by the in-house microswitches are available□ Not required□ Measuring range is 40 m or over □ For hoist-up stop □ HH alarm □ H alarm □ L alarm □ LL alarm◎ An Additional contact signal by a relay. This requirement is not available for DM4N-1□ Not required□ HH alarm □ H alarm □ L alarm □ LL alarm◎ Flameproof cable glands for terminal box cable entry□ Not required □ Required◎ Specifications of cable entry. Refer to the drawing.
Bushing for cable entry location..."A" □ not required □ G1/2 □ G3/4 □ G1
If a cable gland required state cable diameter:φmm
Bushing for cable entry location..."B" □ not required □ G1/2 □ G3/4 □ G1
If a cable gland required state cable diameter:φmm
Bushing for cable entry location..."C" □ not required □ G1/2 □ G3/4 □ G1
If a cable gland required state cable diameter:φmm
Bushing for cable entry location..."D" □ not required □ G1/2
If a cable gland required state cable diameter:φmm

Transmitter main body

Terminal box

Cable entry bushing "C" Max. G1

Cable entry bushing "A" Max. G1

Cable entry bushing "D" Max. G1/2
Cable entry bushing "B" Max. G1
Viewed from rear of level gauge* Specification is subject to change without notice.

Head Office : Shiba Toho Building, 1 – 7 – 24 Shibakoen, Minato-ku, Tokyo 105 – 8558
Tel : +81-3 – 3431 – 1625 (KEY) ; Fax : +81-3 – 3433 – 4922
e-mail : overseas.sales@tokyokeiso.co.jp ; URL : http://www.tokyokeiso.co.jp
6TOKYO KEISO CO., LTD.

TG-L1014-0E