Microsensor MPM4730 User manual

MPM4730/4700
Operation Manual

Contents
1 Introduction ........................................................................................ 1
2 Specifications .................................................................................... 1
3 Outline Construction and Installation .................................................. 3
4 Electric Connection ............................................................................ 8
5 Unpacking、Components and Storage ............................................ 14
6 Operation and Maintenance ............................................................. 15
7 Responsibility .................................................................................. 16
Our company reserves the modification right for this operation
manual due to renovation of production technology and craftwork.
If some information is changed, no more notice will be edited.
Please pay attention to the latest version.
Our company also reserves the right of final explanation for this
manual.
Version: V1.0

1
Thank you very much for selecting Micro Sensor’s product, please take
some time to read this operation manual very carefully before using the
product.
1 Introduction
MPM4730/4700 Intelligent Pressure Transmitter is the intelligent
pressure/level measurement instrument. Using the most advantaged
technologies and the latest achievements in scientific research in the
world, it is famous for its compact size, good stability and wide range.
The intelligent pressure transmitter is suitable for precise measurement
and control for liquid pressure/level in all various fields.
The Explosion-proof version of MPM4700 is an intrinsic safe version,
conforming the standard of GB3836.1-2010 and GB3836.4-2010.
Explode sign is ExiaⅡBT6 Ga.
MPM4730 marine products conform to the requirements of CCS
classification specification for steel sea-going ships (2018) and have
obtained type approval. MPM4700 marine products conform to the
requirements of CCS classification specification for steel sea-going ships
(2006) and have obtained type approval.
2 Specification
Pressure Range: -100kPa…0kPa~10kPa…1000bar（4730）
0mH2O~1mH2O…200mH2O（4700）
Overpressure: ≤2 times FS or 1100Bar(Min. value is valid)

2
Pressure Type: gauge, absolute, sealed gauge（4730）
gauge, absolute（4700）
Accuracy: Accuracy: ≤±0.1%FS ≤±0.25%FS ≤±0.5%FS
Note: The precision of products is related to the range of
measurement, and the precision of products in different range is
different.
Power Supply: 10V～28VDC(RS485 communication interface)
12V～30VDC(HART communication protocol）
10V～12V(The Ann model, the security gate power
supply)
Signal Output: 4mA～20mA (2-wire) ，RS485/HART(optional)
Compensated temperature:-10℃～70℃
Operation temp.:-30℃～80℃(4730 4-pin Plug,7-pin Plug)
-20℃～70℃（4730B2 ,4700, cable material: PE, PVC）
-20℃～80℃（4730B2 ,4700, cable material: PUR）
-20℃~60℃(Intrinsic safety)
Storage temp.: -40℃～85℃(4730 4-pin Plug,7-pin Plug)
-20℃～85℃（4730 Cable type ,4700）
Long-term Stability: ±0.2%FS (typical)
Baud rate: 1200、2400、4800、9600 bits/s are optional
Load Resistance:(U-10V)/0.02A(Ω)(RS485, 4mA~20mA DC output)
(U-12V)/0.02A(Ω)(HART)
RS485 bus line could connect with 99 transmitter.

3
Insulation: 100MΩ／50V
Vibration: 20g (20~5000)Hz
Shock: 20g，11ms
Protection:IP65（4730 B1 & B2）、IP63（4730 B3）
IP68（4700 Transmitter part）、P65(Junction box part)
Cable: ф7.5mm PVC or polyurethane cable with vented tube
Weight: ≤ 250g（4700 No cable） ≤230g（4730）
3 Outline dimension and Installation
3.1 Outline dimension
Unit:mm
（122）
（98）
Φ
26
Φ
16
MPM4700

4
19
(50）
27
SW27
12
M20×1.5
(135)
27
SW27
12
M20×1.5
(122)
SW27
M20×1.5
12
27
(113)
MPM4730（B1） MPM4730（B2） MPM4730（B3）
3.2 Installation
3.2.1 Please be sure before Installation:
a) The measuring pressure is in the measurement range;
b) The measuring medium is compatible with construction material;
c) The measuring medium would not stop up the pressure-leading
hole.
3.2.2 Installation Method
Usually the transmitter should be mounted vertically up to the horizontal
direction. If the condition is unavailable, the allowed max. mounted slope
angle from transmitter to the horizontal direction is 30 degree.
Caution：do not poke the pressure-leading hole with hard things; and do not press
the diaphragm with finger or something sharp to protect the diaphragm.
3.2.2.1 Recommended installation mode of pressure

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products;
The pressure interface of the conventional pressure transmitter is
M20×1.5 with sealing gasket；To facilitate installation and maintenance，
a globe valve should be installed between the flange joint and the pipe,to
see figure 1.
Pressure Transmitter
Valve
Pipe
Figure 1
3.2.2.2 recommended installation method of liquid level
products:
Installation in Static Water
a) The installation method in the pool to see Figure 2.To protect the
transmitter, it should be mounted far away from the pumping in/out
source to prevent the pumping impact; the transmitter also could
be mounted as Figure 3, protected by steel pipe.
b) The installation method in the deep well to see Figure 3.Steel pipe
inserting method could be used. The steel pipe could not be bent,
the internal diameter＞30mm. Several little holes could be made at

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different heights of the pipe for lifting up and down conveniently
and making the water going through unobstructed. If necessary,
the transmitter could be wrapped by steel wire. Lift up and down
with the steel wire to protect the cable.
s ed i me n t
Electnical Connection Box
Control Room
F i x ed M o u n t
Fig. 2
Electnical Connection Box
Fastener
Control Room
Fig. 3

7
Installation in the flowing water (e.g. river-way or reservoir) need water
calming device.
a) Inserting steel pipe in the water channel , The steel pipe should be
thicker, and several little holes should be made at different heights
of the pipe to damp wave and reduce water moving effect. (to see
Figure 4）
b) Superficial burying is better in the sand and stone channel.
（to see Figure 5）
c) This method not only can dispel water flowing pressure and wave
influence, but also can filter the sand and mud.( to see Figure 6)
Electnical Connection Box
Fig. 4

8
Damper
Air Pocket
ELectnical Connection Box
Fig. 5
Fig. 6
4 Electric Connection
4.1 the transmitter is electrically connected with the external
circuit through a plug socket or cable

9
Electric
connection of
non-explosion
proof product
Definition
Internal
Plug
Wiring Color
External Plug Connection
4Wires
Plug
MPM4730 B2
& MPM4700
7
Wires
Plug
＋V 1（Red） 1 Red 1
OUT/GND
2（Black）
2 Black 2
RS 485B 4（White）
White 5
RS 485A 5（Yellow） 3 Yellow(Green) 4
Electric
connection of
explosion
proof product
Definition
Internal
Plug
Wiring
Color
External Plug Connection
4Wires
Plug
MPM4730 B2
& MPM4700
7 Wires
Plug
＋V 1（Red） 1 Red 1
OUT/GND
2（Black）
2 Black 2
Case 3（Blue）
Blue 7
RS485B 4（White） - White 5
RS485A 5（Yellow） - Yellow(Green) 4
Note: Explosion-proof product of 4-pin plug connection only provide (4 ~ 20) mA DC
output
4.2 Typical electrical connection method
a) The electric connection method of transmitter with 2-wire, 4mA～
20mADC output to see Figure 7:

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P
I
P/I Transmitter
P
Input 0V/OUT
+V +
U
DC current
+
-
-
R
Load
I
4mA ～ 20mA
Fig. 7
b) The electric connection method of transmitter only with RS485
communication to see Figure 8:
P
I
P/I Transmitter
P
Input RS485A
+V
+
U
DC current
-
Safety
+ OU T
RS485B
Comp uter
barrier
Fig. 8
Note: when 4mA ~ 20mA DC output and RS485 signal are used at the
same time, RS485 signal will affect 4mA ~ 20mA DC output signal in
communication, and the degree of influence is related to
communication rate and communication frequency.
c) Wiring for HARTtransmitter connecting with hand-communicator.
to see Figure 9:

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MS-H375
transmitter
4 20mADC～
Cur rent meter
Load RL
Power Vs
RL
MS-H375
transmitter
MS-HART232
4 20mADC～
Cu r rent meter
Load R
Power Vs
R
Fig. 9
d) This Ann explosion-proof type electrical connection methods are
shown below.
P
I
Danger zone
P
Input
RS485A
+V
Safety
+OUT
RS485B Computer
Safety zone
Load
Power
+
-
barrier
Safety
barrier
Fig. 10
ExiaIIBT6 Ga [Exia]IIC
Transmitter Ex-proof parameter: Safe barrier’s ex-proof parameter:
Ui:12.4VDC Ii:140 mADC Uo:12.4VDC Io:140mADC Po:0.43W
Li:0μH Ci:1.049μF Pi:0.43W
Note：
Ui：the highest input voltage, the highest voltage which could work on
transmitter input terminals.

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Uo：the highest output voltage, the highest voltage on intrinsically safe
circuit when safe barrier’s output side is open.
Ii：the max. input current, the max. current which could work on
transmitter input terminals.
Io：the max. output current, the max. current on intrinsically safe circuit
which could be got from safe barrier output terminals.
Ci：the max. internal capacitance, the internal equal total capacitance
which could exist on transmitter input terminals.
Co：the max. external capacitance, the max. intrinsically safe
capacitance which could be connected with safe barrier output
terminals.
Li：the max. internal inductance, the internal equal total inductance
which could exist on transmitter input terminals.
Lo：the max. external inductance, the biggest inductance which could
be connected with safe barrier’s terminals.
4.3 Installation notes
There is a plastic tube inside the cable, it is used to connect gauge
sensor with the atmosphere. In the installation and operation, please be
sure the vented tube connected with the atmosphere unobstructed.
Please do not jam the vented tube with mud or sand, especially do not
make water or other liquid going through the vented tube.
4.4 The connection of Explosion-proof version transmitter
and safe barrier

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a) Then the intrinsic safe version transmitter is used in explosive
environment, please connect the transmitter with the safe barrier
to form Intrinsic Safe Ex-proof System.
b) The installation of the intrinsic safe version transmitter should be
conformed to the standard of GB3836.15-2000. Part 15 The
Regulation of Electric Installation in Hazardous Area (except coal
mine) of Electric Equipment Operation in Explosive Gas
Environment.
c) Then Intrinsic safe version transmitter is used in Hazardous Area,
the power transformer which supplies the safe barrier should
conform to the Regulation of GB3836.4-2010.
d) Please install safe barrier and power in safe area, and install
intrinsic safe transmitter in the hazardous area. Pay attention to
grounding safely.
e) The biggest permitted distributed capacitance for the cable
between the transmitter and safe barrier connection is Cp=Co-Ci,
the biggest permitted distributed inductance Lp=Lo-Li.
f) Users can buy a safe barrier by yourself, only need to take care its
specs are as above-mentioned requirements and have an
explosion-proof certificate.
g) The installation of safe barrier is in accordance with its operating
instructions .
4.5 RS485 interface transmitter software

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Transmitter software through RS232/RS485 conversion module, is used
to communicate with RS485 interface (including level range,
compensated temperature range and version), displaying actual
pressure, setting new zero, analog output and transmitter address.
The initial address is random, if the user needs to reset the address,
please notify us or reset it after receiving the product.
5 Unpacking, Shipment Enclosed and Storage
5.1 Unpacking
a) Please be sure that the package is complete, and the package is
put as the sign “UP”;
b) Please be sure do not knock at the package violently, and protect
the housing jacket and rubber bushing.
5.2 Shipment Enclosed
Transmitter out should include:

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MPM4730/4700 Intelligent pressure/level Transmitter 1
Special Cable（connect to transmitter） the length due to the order
Connection Box（connect to transmitter） due to the order
User’s Manual 1
Qualification Tracking Card 1
Converted Interface due to the order
Software due to the order
5.3 Storage
The transmitter shall be stored in a dry and ventilated room with a
temperature of -40℃ ~ 85℃(4730 4-pin Plug,7-pin Plug), -20℃ ~ 85℃
(4730 Cable type ,4700) and a relative humidity ≤85%. There is no
corrosive gas in the indoor air to the transmitter.
6 Operation and Maintenance
6.1 Operation
Customers do not need to make any adjustments to the transmitter to put
it into operation.Before putting into operation, please check the
installation and electrical connection again.After confirming the correct
electrical connection, switch on the power, preheat for 15min and put into
operation.
6.2 Maintenance
MPM4730/4700 intelligent pressure/level transmitter does not need
regular maintenance. However, please pay attention to the following
items for better operation.

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a) Please check the cable connection often and make sure the cable
connection reliably and no aging.
b) Please clean the steel cap and diaphragm cavity according to the
measuring media. (take care!)
c) Please do not pull the cable violently or press the diaphragm with
sharp or hard metal, etc.
d) Please be sure the vented tube connected with the atmosphere
unobstructed. Please do not jam the vented tube to prevent make
additional error.
7 Responsibility
Within one year from the delivery date, we shall repair or replace the
instrument with any quality fault caused by material parts or our
manufacturing technique. For non-quality malfunction during user’s
operation, we are in charge of repair. But the material cost and the
shuttle transportation fees should be borne by users.