Microsensor MPM380 User manual

Operation Manual
MICRO SENSOR CO.,LTD.
www.microsensor.cn
MPM380 PIEZORESISTIVE
PRESSURE TRANSDUCER

Content
1. Brief Introduction................................................................................................................................. 1
3. Operation Principle............................................................................................................................. 2
4. Construction and Dimension.............................................................................................................2
5. Unpacking, Enclosed and Storage.................................................................................................. 3
6. Installation............................................................................................................................................ 3
7. Calibration............................................................................................................................................ 6
8. Operation, Maintenance and Identification.....................................................................................6
Our company keeps the modification right
for product technique and technics
update. If anything is changed, we will not
notice any more. Please pay attention to
the lasted version.
Version: V10.02.1

MPM380 Piezoresistive Pressure Transducer
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1. Brief Introduction
MPM380 Piezoresistive Pressure Transducer is made by putting MPM280 piezo-resistive
pressure sensor into stainless steel housing. The sensor is isolated oil-filled sensor. All the
parts contacting with media are stainless steel, so that the sensor has good anti-corrosive
capability and long-term stability. The sensor is compensated by laser trimming technique in
wide temperature range. This makes the sensor with good zero, sensitivity, linearity and
stability specifications, etc. The sensor is supplied by constant current power (≤2mA). The
electric connection is cable connection or plug connection. The whole transducer is compact
size, easy installation and reliable operation, and is widely used on process control and
pressure/level measurement of petroleum, chemi-industry, metallurgy, spaceflight, aviation,
electric power, textile, light industry and hydrology, ect.
MPM380 flush diaphragm transducer has G1/2 male pressure port with seal cushion. It is
used for the places for fields like food and medicine which is easy to dirty.
MPM380T pressure transducer’s diaphragm is Tantalum, and seal cushion is Viton. It is
used for corrosive environment.
The product is manufactured according to P. R. China Manufacturing Measurement
Instrument Permit Shaanzhi No.03000112.
2. Specification
（@ 1.5mADC）
Accuracy（lin. + Hys. + Rep.）
Min.: ±0.1%FS
Typ.: ±0.25%FS
Max.: ±0.5%FS
Zero temp. coefficient: ≤±0.02%FS/℃(Typ.) ≤±0.04%FS/℃(Max.)
FS temp. coefficient:: ≤±0.02%FS/℃(Typ.) ≤±0.04%FS/℃(Max.)
Stability: ±0.3%FS（one year）
Temp. compensation range: 0℃~50℃
Operation temp. range: -10℃~80℃
Response（10%~90%）:≤1ms
Insulation resistance: 100MΩ，100VDC
Protection: IP65（cable connection）/IP63（plug connection）
Power supply: ≤2.0mADC
Electric connection: cable 2m or 7-pin plug
Common mode voltage output: 50% input
Unit
kPa
MPa
Range
20
35
70
100
200
350
700
1
2
3.5
7
10
20
35
70
100
Overpressure
1.5 x FS or 110MPa（min. value is valid）
FS output
≥70mVDC（0~20kPa, ≥50mVDC）

MPM380 Piezoresistive Pressure Transducer
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Input impedance: 2kΩ~8kΩ
Output impedance: 3.5kΩ~6kΩ
Pressure port: M20 ×1.5 male with seal cushion or G1/2 male with seal cushion (flush
diaphragm)
3. Operation Principle
The sensing component of MPM380 Piezoresistive Pressure Transducer is reliable solid
piezo-resistive sensing die. A little silicon oil is filled between sensing die and diaphragm. The
pressure acts on stainless steel diaphragm, and is transferred onto sensing die through silicon
oil (see chart 1). The signal transformation between pressure and electrical is achieved
through conductive silicon material. Due to the good relationship between voltage signal,
which is output by Wheatstone Bridge, and the acted pressure. The pressure could be
measured precisely.
Chart 1
4. Construction and Dimension
4.1 Construction material
Sensor’s construction material:
Housing: stainless steel 1Cr18Ni9Ti
Diaphragm: stainless steel 316L（Tantalum is optional）
O-ring and seal cushion: NBR （Viton is optional）
Rubber casing: NBR
Plug: Brass plating Nickle
Cable: ф7.2mm PVC cable
4.2 Construction and Dimension （mm）
Sensor outline and installation to see chart 2:

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Chart 2
1
1
2 meter or as ordered
1
1
5. Unpacking, Enclosed and Storage
5.1 Unpacking
Pay attention before unpacking:
Please be sure the package is complete firstly, the package should be put as mark “UP”.
If possible, please put the transducer in the room for some time, and then unpack.
5.2 Enclosed
MPM380 Piezoresistive Pressure Transducer
Plug（only for plug connection type）
Cable（only for cable type, mount on sensor）
Product Qualification Certificate
Operation Manual
5.3 Storage
The transducer should be stored in the dry and ventilated room (room temperature range
-40℃~120℃, relative humidity no more than 85%. There should be no corrosive gas in the
room.
6. Installation
6.1 Check before installation
Please notice before installation:
（1）Please be sure the pressure at measured point is less than sensor upper limited
pressure range;
（2）Please be sure the measured media is compatible with construction material;
（3）Please be sure the measured media will not jam the pressure leading hole of the
transducer.
6.2 Installation
Generally, the transducer is mounted vertical down. If the environment is limited, the max
available slope angle between transducer and horizont is 30 angle.
Transducer with plug connection is not suitable for outdoor installation.
Please do not mount the transducer reversed.
MPM380 transducer’s pressure port is M20 ×1.5 male with NBR rubber seal cushion;
flush diaphragm transducer’s pressure port is G1/2 male column tube with seal cushion, this
could be mount on the flange connector directly. In order to easy installation and repair,

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tra n s d u c e r
c u t-off v a lv e
p ip e
B lu e
B la c k
R e d
W h ite
Ye llo w
please mount cut-off valve between flange connector and the pipe.
Attention: Please be sure that do not poke or press the diaphragm with iron wire, steel
pins and some hard or sharp objects to protect diaphragm.
The recommended installation to see chart 3:
Chart 3
6.3 Electric Connection
6.3.1Circuity principle chart
The circuitry principle chart of transducer supplied by constant current to see chart 4:
Chart 4
6.3.2 Electric connection method
The sensor is connected with outside circuit through 7-pin plug or cable.
Cable terminals and plug pins’ definition:
Connection Cable Pins
+IN Black 3
-IN Yellow 5
-IN White 1
+OUT Red 2
-OUT Blue 4
Notice: 1. temp. compensated resistances R1 or R2 and zero compensated resistances R3 or
R4 have been calibrated and packed when the transducer is delivered.
2. Zero calibration could use 22Ωpotentiometer. If zero is elevated, the user could

MPM380 Piezoresistive Pressure Transducer
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5 4
2
7
3
1
66
1
3 4 5
2
7
orientation
groove
orientation
protuberance
Chart 7
calibrate transducer exteriorly.
Pins to see chart 5:
Chart 5
6.4 Plug Operation (transducer with plug connection)
YL14F plug is the enclosed component of MPM420 controlling pressure transmitter
which is made by our company self. The plug has reliable connection and good protection.
For easier operation and installation, please confirm LY14F plug operation:
1. Disconnect the plug from transducer socket:
The socket is fixed on transducer housing, connecting with plug by thread connection. If
the user wants to disconnect plug, please firstly unscrew metal screw cap anticlockwise by
fingers, then disconnect the plug.
2. Cable connection:
a. Clamp the screw cap with left middle finger and first finger, and fix plug core with thumb.
Unscrew the black plastic screw cap anticlockwise with right hand, and then disconnect the
plug. Please see chart 6:
Chart 6
b. Thrill cable through the plug from right to left as indication on chart 6. Weld wires to
pins on the plug as item 6.3, then put on plastic casing and restore the plug.
3. Insert plug into the transducer socket:
a. please check the orientation marks on the plug and socket
There is a little wide and deep orientation groove on the core of plug YL14F (see chart 7),
it is used for matching to the orientation protuberance (see chart 8) on the socket. Please pay
attention that there are two little groove near the orientation groove on the plug core, they are
technics groove for production, but not orientation groove.
Chart 8

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b. Match the orientation groove on the plug core to the protuberance on the socket lightly;
c. Screw the screw cap with fingers, then finish the whole connection.
Note:
1. When weld wires, please do not take too much Tin. Cover wires with plastic casing to
prevent short.
2. Please use cable ф5~6mm to connect, this would make seal reliably. Please do not
connect with 2 single wires to connect, for the vapor would go into the socket through
the cable to cause short and corrode.
7. Calibration
We have checked the transducer according to product standard and user’s requirements
when it is delivered from our factory. The user could check as the following steps:
7.1 Zero output check
Install the transducer onto pressure gauge, the pressure is zero. Then do electric
connection as item 6.3 and power on.
The available zero output error is 0±2mV.
7.2 FS output check
a. Calibrate pressure gauge, make the pressure on the gauge is the same as transducer
FS pressure.
b. transducer FS output should confirm to regulated requirements.
c. If the user wants to check the output at other pressure point, please make the pressure
on the gauge be equal with the measuring pressure.
7.3 Condition
Please fulfill the following conditions before check:
a. please be sure transducer’s installation and electric connection confirm to this
operation manual;
b. please be sure the accuracy of pressure gauge is higher min. 1~2 class to transducer;
c. please check the transducer at standard conditions.
8. Operation, Maintenance and Identification
8.1Operation
Please install the transducer as manual indicates, then operate.
Before operation, please be sure the installation and electric connection are correct.
Power on and operate.
The transducer will work once it is powered on, but the output signal will be more stable
and reliable after 30 minutes.
8.2 Maintenance
Please pay attention to the following contents for everyday maintenance:
a. Please check the electric connection often, and make sure it is reliable.
b. Please do not poke or pressure the diaphragm with metal wire or sharp objects.
c. Please clean flush diaphragm with impregnant, and please do not peel off or knock off

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the dirty violently.
8.3 Failure Identification
If the transducer has some failures like no output, output too low or too high, please
power off firstly, and then check installation and wire connections. Please make sure the
power supplied current is correct, and vented tube (gauge type) is unobstructed.
If the failure can not be solved, please contact with our company in time.