www.microsensorcorp.com V3.0 09/2020
MPM4780W
Intelligent
Level Transmitter
Features
• RS485 communication interface,
Standard MODBUS-RTU Protocol output
• Netting available
• Short circuit protection and reverse
polarity protection
• Full stainless steel construction, compact
size, light weight
• Good output consistency and
replaceability
• Available for calibration and parameter
change on site through matched
software of computer
Introduction
MPM4780W Intelligent Level Transmitter is a highly integrated
measurement product with high stability.It uses intelligent
processing circuit, the most advanced design and manufacturer
technology of piezoresistive pressure transmitter, and is
available for pressure signal and temperature signal output that
in accordance with standard MODBUS-RTU protocol. Featuring
integrated design, standard digital output, great compatibility, small
size, high accuracy, light weight and wide pressure range, it can
be applied in many fields which involve high accuracy required
measurement of uids. It also can take replace of level transmitters
in the form of MODBUS-RTU protocol output by providing level
type measurement for users.
Specication
Range 0m~3.5m…200mH
2
O
Over pressure 1.5 times FS / 1100bar (min. value is valid)
Pressure type Gauge/ Absolute/ Sealed gauge
Power Supply 9V~28V DC
Output signal RS485 Interface(MODBUS-RTU protocol)
Accuracy ±0.5%FS
Thermal drift ±0.04%FS/
℃
(≤1bar); ±0.03%FS/
℃
(>1bar)
Measurement
Error
±2
℃
(For “temperature & pressure type” only)
Application Temp. -10
℃
~70
℃
Storage Temp. -20
℃
~85
℃
Insulation 100V, 100M
Stability ±0.3%FS/YEAR
Shock 20g, 25Hz~2000Hz
Impact 100g, 11ms
Protection IP68
Weight ~250g;
Housing Stainless steel 304
Diaphragm Stainless steel 316L
O- Ring Viton
Notes:
1. Shrinking range is 1/5 basic range, no range extension;
2. For special temperature requirement, please feel free to contact
our company.
02
MPM4780W
Level Transmitter
www.microsensorcorp.com V3.0 09/2020
Level
Outline Construction
(Unit: mm)
Communication Connection
Assistant Software
Electrical connection for transmitter with RS485
interface(MODBUS Protocol):
Transmitter connecting the outside by plug or cable:
MPM4780 Transmitter Software
RS232/485 Conversion module is used to communicate
with RS485 interface transmitter, available for real time
pressure/temperature display and calibration on site.
Some parameters calibration was done before being
transported at factory, so users do not have to modify
them. When mistaken operations happen,users can
push ��Back to Factory Setting”to turn it to factory setting.
Besides, the software keeps Data Record section,
which allow users to set the record interval freely for
recording and saving data, and the data can be saved
in the forms of “*.Excel”.
Note:
MPM4780 Transmitter Software, can be downloaded on
our website: www.microsensor.cn
Function
Inner plug
pin color
Outer Electrical Connection
Wire Color
+V 1 (Black) Black
-V 2 (Red) Red
RS485B 4 (White) White
RS485A 5 (Yellow) Yellow
16
26
（124）
（135）
50
φ27
M20×1.5
12
SW27
（122）
M20×1.5
12
SW27
φ27
（111）
M20×1.5
12
SW27
φ27
（122）
（98）
φ26
φ16
φ26
P Input
Transmitter
I
U
Black /+V
Red /+OUT
Yellow /RS485A
White /RS485B
Interface
10～28VDC
＋ －
P
Computer &
software