Microsensor MPM4811 User manual

MPM4811
Operation Manual

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

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Thanks you very much for choosing products from Micro Sensor Co.,
LTD. MPM4811 is a precise pressure measurement instrument. To use it
better, please read this operation manual carefully before using.
1 Introduction
MPM4811 is a full sealed submersible transmitter for both level and
temperature measurement with good quality. A high stable and reliable
piezo-resistive OEM pressure sensor and a PT1000 temperature
sensor are mounted with the high-performance signal processing
circuit in the stainless steel housing. Advanced production technology
and automatic production line ensure the stability of products, and
good adaptation makes your device able to be applied in various
complex environments.
MPM4811 Level Transmitter is suitable for level and temperature
measurement and control in petroleum, chemical, power plant, city
water supply and hydrology fields.
2 Specification
Range: 0mH2O~1mH2O…200mH2O
-20℃ ...0℃ ~ 10℃ ...70℃
Overpressure: ≤2 times FS;
Pressure Type: Gauge, Absolute
Accuracy: ±1%FS（0mH2O ~ 1mH2O<X<2mH2O）
±0.5%FS（2mH2O≤X<200mH2O）
Note: The precision of products is related to the range of measurement,

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and the precision of products in different range is different.
Stability: ±0.2％FS/year
Zero thermal drift: ±0.02％FS/℃
FS thermal drift: ±0.05％FS/℃
Operation Temp.: -20℃~80℃；
Storage Temp.: -20℃~85℃
Electric Connection: 4-wire (level & temperature double output)
Power Supply: 12V~30V DC
Output Signal: 4mA~20mA DC(level) + 4mA~20mA DC (temperature)
Load(Ω): ＜(U-12V)/0.02A
Protection: IP68
3 Outline Dimension and Installation
3.1 Outline Construction
Unit: mm
Outline Dimension
（122）
（9 8）
Φ
2 6
Φ
1 6

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3.2Installation
3.2.1 Attentions before transmitter installation:
a) Check if the static pressure produced by the liquid in the
installation place exceeds the transmitter FS range or not.
b) Check if the measured liquid is compatible with the transmitter
construction material.
c) Check if the measured liquid could block the inlet of the
transmitter.
3.2.2 Installation Methods
The installation direction of transmitter is vertical down.
When it is used in flowing water, please be sure the sensing surface
parallel to the direction of the flow.
3.2.2.1 Installation in the Static Water
The installation in the water pool is shown in figure 1:
To prevent the transmitter from shaking or destroying when pumping,
the transmitter should be placed far away from the liquid source.
Otherwise it should be kept by steel tube like figure 2.
The installation method in deep well is shown in figure 2.
The installation in the deep well usually takes the steel tube inserted
method. The steel tube cannot be bent, and the steel tube diameter
must be larger than outer diameter of transmitter, easy for lifting up and
down. Several holes should be made at different heights of the tube for
water going in and out unobstructed. If necessary, the transmitter could

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be wrapped by steel wire to prevent braking the cable by lifting with the
steel wire.
s e d i m e n t
El e c t ni c a l C on n ec t io n B o x
C o n t r o l R o o m
F i x e d M o u n t
Figure1
Electnical Connection Box
Fastener
Control Room
Figure 2
3.2.2.2 Installation in Flowing Water（e.g. river channel,
reservoir area, etc.）
The water-calming equipment is required.

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Method 1: Insert a steel tube in the water channel(see figure 3).
The steel tube wall should be thicker, and several holes should be
made at different heights of the tube to damp waves and clear the
water pressure influence.
Method 2: Superficial burying is better in the sand and stone
channel(see figure 4).
Method 3: If the pressure is high in the flowing water or there are
sediments in the water, please install refer to figure 5.
Electnical Connection Box
ELectnical Co nnectio n Box
Figure 3 Figure 4
Figure5
Damper
Air Pocket

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4. Electric Connection
Transmitter is connected through cables.
Please make wire connection according the above wire definition.
Eg. Level 4mA~20mA (2-wire) connection.
P
I
P/I Transmitter
P
Input 0V/OUT
+V +
U
DC current
+
-
-
R
Load
I
4mA ～ 20mA
Attentions: There is a plastic breath tube inside the specialized cable
of MPM4811. It is used for connecting the back pressure chamber of
gauge pressure transmitter with atmosphere. During the installation and
usage, users shall keep it smooth between the tube and atmosphere. It is
highly prohibited to block the breath tube by mud, sand or other things.
Water or other liquids are prohibited either to flow into the breath tube to
advoid damaging the transmitter.
Wire Color Electric Definition
Red Level Power Supply
Black Level Output
Yellow Temp. Power Supply
White Temp. Output

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5 Unpacking, Storage and Shipment Enclosed
5.1 Unpacking
Attentions before unpacking:
a) Please be sure the package is complete, and the package is put as
the sign “UP”;
b) Please be sure do not knock at the package violently to avoid any
possible damages on the cable sheath .
5.2 Shipment Enclosed
The transmitter should include following items when out of factory:
MPM4811 Level Transmitter 1pc
Cable(connected with transmitter) length as users’ request
Operation Manual 1pc
Product Certificate 1pc
5.3 Storage
The transmitter shall be kept or stored in a dry and ventilated room
with no corrosive gas and surround temperature range: -20 ~8℃5 , ℃
relative humidity: ≤85%.
6. Operation, Maintenance and Responsibility
6.1 Operation
The transmitter could be put into use without any adjustment.
Before using, please be sure the installation and electric connection
are correct. If no problem, please power on and put into operation.
The transmitter could start to working with power, but the output signal

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will be more stable after 30min.
6.2 Maintenance
The transmitter does not need regular maintenance generally, but to
use it better and improve its reliability, please pay attention to following
maintenance work:
a) Please check if the connection is firm and cable is broken or aged
or not.
b) Please clean the cap and diaphragm chamber (caution!) regularly
based on the liquid condition.
c) Please do not drag the wires or poke the sensor diaphragm by
hard substance.
6.3 Failure Diagnosis
MPM4811 Level Transmitter has an integrated full-sealed construction
without movable parts inside, owing long-term stability and reliability.
If some emergencies occur, such as no output, weak output, over large
output or output unstable, please turn off the excitation firstly, then
check if the installation and wire connection conform to the operation
manual or not, the excitation is correct or not and the breath tube is
unobstructed or not.
If unsuccessful, the transmitter may be destroyed, please contact with
our company.
7 Responsibility
Within one year from the delivery date, we shall repair or replace the

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instrument with any quality fault caused by material parts or our
manufacturing technique free of charge. 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