3
Ⅲ．EXTERNAL CONNECTION DIAGRAM
・Two wires method transmitter receives 24V DC power
supply from outside and using power supply wiring,
transmits 4 to 20mA DC signal to external receiver units.
Note : Our receiver is equipped with AC-DC power supply
circuit for two wires method our transmitter,
therefore, In using combination with our receiver,
there is no need of the AC-DC power supply which
is separately available.
・Two wires method transmitter can monitor output signal
during operation, if they are connected with ampere
meter with internal resistance of less than 10Ω to check
terminal.
・Be careful about connection of two wires method
transmitter and four wires method transmitter as see
figures they are reverse in terms of current flow.
・Four wires method transmitter, which receives 100V AC
power supply, generates 24V DC inside transmitter to
work transmitting output signal to external receives.
Transmission output diagram (differential pressure - output signal)
Ⅳ．INSTALLATION AND TRIAL RUNNING
1．Installation
・Install this instrument at horizontal position (inclination angle at 5 °). If installation surface is vertical,
use the installation bracket on vertical wall to install horizontally. (refer to p.7)
・Take the space of 0.5 m above the transmitter for the purpose of adjustment and maintenance.
・Do not install the instrument outdoors directly. If you need to get it installed outdoors directly, store the
instrument at the storage casing with dew-proof construction.
･Avoid using where the instrument is subject to vibration, big impact and high humidity.
･Do not use at the place where corrosive gas (such as sulfuric gas and ammonia gas etc.) is present.
･Try to use the instrument away as far as possible from intensified power source and the unit generating
high frequency (high frequency welder and high frequency sewing machine etc.).
・The instrument is not designed for measurement of combustible gas and installation where explosive
danger risk area (hazardous area) exists. For flammable gas, be sure to provide by intrinsically-safe
system (
EMT1H S
).
Two wires method
Four wires method
0
4mA(1V)
12mA(3V)
20mA(5V)
0
50
100
-50
0
+50
（mA）
Pressure （％ FS）
For single pressure range
For zero center range
Output signal
Pressure （％ FS）
Output signal
（mA）
0mA(0V)
0.5mA(2.5V)
1mA(5V)
0
50
100
-50
0
+50
For single pressure range
For zero center range
EMT 1
4 to 20 mA
1
2
4
3
Check terminal
from 4 to 20 mA
Grounding
Power supply DC 24 V
Receiving
equipment
4 to 20 mA
0 to 1 mA DC
0 to 5 V DC
0 to 5 V DC
EMT 1
1
2
4
3
Grounding
Receiving
equipment
Power supply
AC 100 V 50 / 60 HZ
