Microsensor MPM User manual

V2.1
MPM/MDM4760
Operation Manual

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
MPM/MDM4760 transmitter is a new-developed digital intelligent
transmitter with high accuracy & good stability, and can provide prompt
measurement and displaying with the update of measured
pressure/differential pressure. The transmitter adopts the latest research
results of special wide temperature LCD display and digital technology in
sensor manufacture industry, combining with the most advantaged
production technologies of piezoresistive pressure/differential pressure
transmitters, precise digital temperature compensation and non-linearity
modification technology to ensure the high accuracy and good stability of
pressure measurement. The transmitter strictly conforms to ISO9000
international quality production system, could be used for the precise
measurement of flowing pressure in various industries.
The product measurement tools type approval No. 15F139-61.
2 Specifications

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MPM4760 pressure transmitter：
Measure range：-100kPa…0kPa~10kPa…100MPa
Overpressure:1.5 times FS or 110MPa(Min. value is valid)
MDM4760 differential pressure transmitter：
Measure range：0kPa~35kPa…3.5MPa
+overpressure：2 times FS
-overpressure：FS
Max.static pressure：≤20MPa
Total Accuracy①:±0.25%FS
Stability: ±0.2%FS/YEAR
Compensated Temp.: -10℃~70℃
Working Temp: -30℃~80℃
Storage Temp: -40℃~85℃
Power Supply: 8V~28V DC or Battery supply
Output signal Standard: analog 4mA~20mA DC, 2-wire; digital RS485
interface
Battery Supply: None
Battery supply with RS485 output: digital RS485 interface
RS485 interface: ASCII agreement or MODBUS RTU, BUS with 99
transmitters.
Load Resistance (Ω)：（U-8V）/0.02A U is power voltage（standard）
Display Range：-19999~19999 LCD Display
Insulation: 50V, 100M
Shock: 20g, 20Hz~5000Hz
Impact: 20g, 11ms
Protection: IP65

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Weight: ~420g
Housing: stainless steel
Diaphragm: stainless steel 316L
O- Ring: Viton
①：Total accuracy including：Lin.+Hys.+ Rep.+ Zero Temp. Error + Sensitivity Error
(be suitable for basic range)
3 Outline Construction and Installation
3.1 Outline construction（Unit: mm）
MPM4760 pressure transmitter：
78
50
132
12
27
M20×1.5
SW27
76
φ
φ

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MDM4760 differential pressure transmitter：
78
27
76
58
145
G1/4
88
22
φ
φ
3.2 Installation
3.2.1 Notes for installation

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a) Measured pressure shall not be beyond the scope of transmitter
pressure range;
b) Media should be compatible with the contacting parts of transmitter;
c) Be sure the pressure hole shall not be blocked by media.
3.2.2 Installation procedure for Pressure transmitter
The transmitter usually is installed upward and perpendicular to the
horizontal direction. If the condition is limited, it is allowed to install the
transmitter at most 30 degrees angel with the horizontal direction. a
shut-off valve is suggested to mounted between the flange and pipe for
easier installation and maintenance. The hexagonal nut at the
connection between the housing and the base of the MPM4760 can be
used to adjust the face orientation of the meter. H is high pressure
interface, L is low pressure interface. Three valves manifold are
recommended for differential pressure products to protect the transmitter.
Notes: Pushing or poking the pressure hole with iron wire, steel pin and
other hard objects, and pushing diaphragm by hand are forbidden to
keep diaphragm from damage or deformation. Note the interface of
differential pressure transmitter.
Installation (suggested) as below:
Figure 3.1
Transmitter
Shut-off Valve
Pipe

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4 Electric Connection
Output Signal
Function
Pins
Cable
4~20mA DC,2-wire
+V
1
Black
+OUT
2
Red
Communication
interface
RS485A
3
Yellow
RS485B
White
The electrical connection of transducer with 2-wire，4～20mADC output
to see below.
The electrical connection of transducer with 4mA～20mADC output and
RS485 to see below.
Note：when 4mA～20Ma DC output and RS485 are used at the same time, signal
485 may interfere 4mA ～20mA DC output signal. The influence is related to
communication speed and frequency. “Setonline” controlling software could be
downloaded from our website.
P Input
transmitter
P
I
+V
+
-
Load
+OUT
Output I
DC mA Meter
4mA~20mA DC
U
R
A
8V~28V DC
P Input
P
I
+V
+
-
Load
+OUT
Output I
4mA~20mA DC
U
R
A
8V~28V DC
RS485A
RS485B
interface
Computer
DC mA Meter
&Software
transmitter

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The electric connection only to RS485 is to see below.
5 Unpacking、Components and Storage
5.1 Unpacking
Attentions:
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 Components
MPM/MDM4760 pressure/differential pressure Transmitter 1pc
Product instruction manual 1pc
Certificate of quality 1pc
Software due to the order
5.3 Storage
The transmitter should be stored in dry & ventilate room with
environment temperature -40 ℃~85 ℃, relative humility ≤85%, and no
corrosive gas.
8V~28VDC
RS485B
&Software
P Input
P
I
+V
+
-
+OUT
U
RS485A
interface
transmitter
Computer
Battery powered RS485
output type, no external
power supply is required.
Battery powered RS485
output type, no external
power supply is required.

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6 Assistant Software
MS Setonline Software.
Through RS485 conversation module, the user could read inner basic
information for RS485 interface transmitter (Includes model number, ID
number, range, unit, etc.) and display pressure value, reset operation, set
analog output, set meter address, etc.
Note: MS Setonline Software can be downloaded on our website:
www.microsensor.cn
7 Parameter Setup and Calibration
7.1 Display and Press Key Instruction
The two keys on the front panel are “SET” and “∧” respectively.“ ∧”key
is used for parameter modification. “SET” key is used for choosing
function parameters and making sure parameter modification.

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7.2 Basic Parameter Setup
We have calibrated the transmitter according to your requirements when
the products are out of factory, you could operate it directly. However,
you also could modify or calibrate the parameter in the worksite due to
7.2 and 7.3.
7.2.1 Under measurement situation, press “SET” key about 3 seconds,
the sub-display screen indicates “PASS” and the main display screen
indicates “1980”. Press “∧” and “∧+SET ” to modify the password into
“1993”, then press “SET” to confirm. The transmitter indicates the first
basic parameter sign. See the following chart:
Measure
1980
PASS
SET
1993
PASS
∧/∧+SET
SET
XX.XXX
Poin
∧
Input password ---------------
Display accuracy setup---------

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XXXXX
dPL
XXXXX
dPH
SET
SET
∧/∧+SET
∧/∧+SET
Zero display value setup------
FS display value setup-------
XXXXX
dAL
SET
∧/∧+SET
4mA output pressure value----
XXXXX
dAH
SET
∧/∧+SET
20mA output pressure value ---
XXXXX
ZEro
SET
∧/Long pressing ∧
rezero /nrz operation------------
kPa/…
Unit
SET
∧
Pressure unit option------------

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1200/…9600
bArd
SET
∧
Baud rate setup option---------
01/…99
Addr
SET
∧/∧+SET
Transducer address option-----
XXXX
dA0F
SET
∧/∧+SET
4mA output calibration---------
XXXX
dAFF
SET
∧/∧+SET
20mA output calibration -------
yES/no
FAct
SET
∧
Restore factory setting or not--
XXXXX
-End-
SET
Save the Settings and exit-----

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7.2.2 Under parameter modification situation, press “∧”and“∧+SET” to
modify the current parameter value, then press “SET” to make sure. The
transmitter indicates the next parameter note sign automatically;
7.2.3 Repeat steps (1) and (2) to modify other parameters, then the
transmitter returns to measurement situation automatically;
7.2.4 Under basic parameter setup situation, if no any other key to be
pressed in thirty seconds, the transmitter will return to measurement
situation automatically;
7.2.5 If the user choose Restore Factory Setting, the transmitter will
restore to the basic parameter setting when out of factory;
7.2.6 The number of menus varies depending on the product type.
Note: when you calibrate the parameters of standard 4mA output and
20mA output, it is needed to connect DC mA meter in series to monitor
the loop current and calibrate 4mA and 20mA output current exactly.
7.3 Operation Instruction
When the transmitter is powered, it indicated the transmitter type and
software version No., then enters to measurement situation, the main
display screen indicates the current pressure value. The vice- display
screen could indicate max. value, min. value, percentage, output
current , temperature and pressure unit.

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a) Under measurement situation, short pressing “∧”key（no more than 2
seconds）, the vice display indicates max. value, min. value, percentage,
output current, temperature and pressure unit.
b) Under measurement situation, long pressing“∧”key（more than 2
seconds）， the transmitter will clear the vice display’s record of max. value
and min. value, and restart to record the peak value.
c) For battery supplied type:
d) The backlight is turned on after any key operation，No key operation
for 30 seconds, the transmitter will turn off the backlight.
8 Operation、Maintenance and Responsibility
8.1 Operation
The user could operate the transmitter without any adjustment.
Please check the installation and make sure the correct electric
connection before operation. Then connect the power and operate.
8.2 Maintenance
Transmitter does not need regular maintenance. However, please pay
attention to the following items for better operation.
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!)

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c) Please do not pull the cable violently or press the diaphragm with
sharp or hard metal, etc.
d) Please dispose the waste batteries properly to avoid polluting the
environment.
8.3 Failure identification
If the transmitter is failure, such as no output or output unstable, ect.
Please shut the power first, then check if the installation and cable
connection conform to manual, power voltage is correct or not, vented
tube is unobstructed or not and the system works well or not. If
something is abnormal, please try to get rid of the failure. If the failure
can not be dealt with, please contact with our company promptly.
8.4 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 free of charge. For non-quality malfunction
during user’s operation, we are in charge of repair. The material cost and
the shuttle transportation fees should be borne by users.